MC33293 [MOTOROLA]
QUAD LOW SIDE SWITCH; 四通道低边开关
| 型号： | MC33293 |
| 厂家： | 
MOTOROLA |
| 描述： | QUAD LOW SIDE SWITCH |
| 文件： | 总16页 (文件大小：240K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by MC33293A/D
The MC33293A is a single monolithic integrated circuit designed for quad
low side switching applications. This device was initially conceived as a quad
injector driver for use in the harsh automotive environment but is well suited
for many other applications. The MC33293A incorporates SMARTMOS
technology having CMOS logic, bipolar and CMOS analog circuitry and
DMOS power MOSFETs. All of the device inputs are CMOS compatible. The
four output devices are N-channel power MOSFETs. A Fault detect output is
provided to flag the existence of open loads (outputs ON or OFF) or shorted
loads. If a short circuit is detected, the fault detect circuitry turns off the
shorted output, but allows the others to function normally. An overvoltage
QUAD LOW SIDE SWITCH
(R
= 0.25 Ω Max per Output)
DS(on)
SEMICONDUCTOR
TECHNICAL DATA
(V
) condition will turn off all outputs for the overvoltage duration. Each
PWR
output functions independently and has a drain-to-gate diode clamp for
inductive flyback voltage protection. A Single/Dual select pin is incorporated
to allow either individual output control or control of a pair of outputs from one
input.
1
The MC33293A is parametrically specified over – 40°C ≤ T ≤ 125°C
A
ambient temperature and a 9.0 V ≤ V
≤ 14.5 V supply.
PWR
T SUFFIX
PLASTIC PACKAGE
CASE 821D
• Designed to Operate with Supply Voltages of 5.5 V to 30 V
• CMOS Compatible Inputs with Active Pull-Downs
• Maximum 5.0 mA Quiescent Current
• R
of 0.25 Ω Maximum at 25°C, with V
≥ 9.0 V
DS(on)
PWR
• Each Output Clamped to 65 V for Driving Inductive Loads
1
• Each Output Current Limited at 3.0 A to handle Incandescent
Lamp Loads
• Active Low Output Fault Status with Interrogation Capability
• Open Load Detection (Output ON or OFF)
• Capable of Withstanding Reverse Battery
• Overvoltage Shutdown
TV SUFFIX
PLASTIC PACKAGE
CASE 821C
• Short Circuit Detection and Shutdown with Automatic Retry
PIN CONNECTIONS
Pin 1. Output 2
2. Output 1
3. Input 1
ORDERING INFORMATION
Operating
4. Input 2
5. Input 1 & 2
6. Single/Dual
Temperature Range
Device
MC33293AT
MC33293ATV
Package
7. V
8. Gnd
9. N/C
PWR
T = –40° to +150°C
J
15 Pin SIP
10.Fault
11.Input 3 & 4
12.Input 4
13.Input 3
14.Output 3
15.Output 4
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
Motorola, Inc. 1996
Rev 0
MC33293A
Simplified Block Diagram
7
+V
PWR
3
4
Input 1
Input 2
Overvoltage
Shutdown
Bias
Circuit
Bias
2
Output 1
13
12
1
Input 3
Output 2
Output 3
Output 4
Gate
Control
14
15
Input 4
5
6
Input 1 & 2
Open
Load
Detect
To Gates
2,3,4
Single/Dual
Select
11
Short
Circuit
Detect
Input 3 & 4
Fault
I
limit
10
R
S
8
Ground
Fault
Encoder
From Detectors 2,3,4
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
V
CC
V
Steady-State
Transient Conditions
V
–13 to 30
–13 to 60
PWR
V
PWR(pk)
Input Pin Voltage
V
– 0.5 to 7.5
V
V
in
ESD Capability
V
ESD
Human Body Model (R = 1.5 kΩ, C = 200 pf)
2000
Lead Current (per Output)
I
Internally
Limited
A
Out
Single Pulse Clamp Energy @ 25°C, 1.5 A
Storage Temperature
E
100
mJ
°C
°C
°C
W
clamp
T
stg
– 55 to +150
– 40 to +150
260
Operating Temperature
T
J
Lead Temperature (Wave Solder, 10 s)
T
solder
Power Dissipation @ T = 105°C
11.25
6.25
P
D
A
Power Dissipation @ T = 125°C
A
Derate for every °C above 25°C
0.25
W/°C
°C/W
°C/W
Thermal Resistance Junction-to-Ambient
R
R
35
θJA
Thermal Resistance Junction-to-Case.
Any one O/P
4.0
θJC
2
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
STATIC ELECTRICAL CHARACTERISTICS (9.0 V ≤ V
noted. Typical values are at 25°C, unless otherwise noted.)
≤ 14.5 V and – 40°C ≤ T ≤ +125°C, unless otherwise
C
PWR
Characteristic
Symbol
Min
Typ
Max
Unit
INPUT
Turn ON Threshold
V
—
5.5
—
3.4
—
5.5
30
V
V
on(th)
Operating Voltage Range
Quiescent Power Supply Current (All Inputs off)
Overvoltage Shutdown Range
Overvoltage Reset Hysteresis
Input Voltage
V
PWR
I
2.2
35
5.0
38
mA
V
PWR
V
30
2.0
PWR(ov)
V
5.0
7.0
V
PWR(hys)
V
High (I
Low (I
= 1.0 A)
= 80 µA)
V
V
3.0
—
2.3
1.6
—
0.8
DS
DS
IH
IL
Input High Hysteresis (I
= 1.0 A)
V
0.4
0.7
—
V
DS
IH(hys)
Input Current
µA
High (V = 3.0 V)
IH
I
I
IL
—
—
11
11
50
50
IH
Low (V = 0.8 V)
IL
OUTPUT
Static Drain-Source On-Resistance
RDS
Ω
(on)
(I
DS
(I
DS
(I
DS
(I
DS
= 1.0 A, V
= 1.0 A, V
= 0.7 A, V
= 0.4 A, V
= 13 V, T = – 40°C to + 25°C)
—
—
—
—
0.18
0.28
0.20
0.22
0.25
0.50
0.40
0.50
PWR
PWR
PWR
PWR
C
= 13 V, T = +125°C)
C
= 8.0 V, T = + 25°C)
C
= 5.5 V, T = + 25°C)
C
Drain-Source Clamp Voltage
(I = 20 mA, V = 0 V, t
BV
V
DSS
= 100 µs)
55
64
80
DS in
clamp
Zero Input Voltage Drain Current
I
DS(off)
(V
DS
(V
DS
= 25 V, V
= 58 V, V
= 14.5 V)
= 14.5 V)
10
—
23
0.06
80
2.0
µA
mA
PWR
PWR
Source Drain Diode Forward Voltage (I
= 1.0 A)
V
SD
—
0.62
1.4
V
SD
3
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
STATIC ELECTRICAL CHARACTERISTICS (continued) (9.0 V ≤ V
noted. Typical values are at 25°C, unless otherwise noted.)
≤ 14.5 V and – 40°C ≤ T ≤ +125°C, unless otherwise
C
PWR
Characteristic
FAULT STATUS OUTPUTT
Fault Status Pin
Symbol
Min
Typ
Max
Unit
V
Low Voltage (V
= 14.5 V, I = 1.0 mA, open-load on
stl
V
—
0.1
4.7
0.4
5.5
PWR
stl
Output 1, 2, 3 or 4. All inputs = 0 V)
High Voltage, (V = 14.5 V, I = – 30 µA, Note 1)
V
sth
3.0
PWR
sth
FAULT DETECTION
Output Limiting Current (V
= 13 V)
I
3.0
4.0
6.0
A
V
PWR
DS(limit)
Over-Current Detect Voltage Threshold and
Output-Off Open-Load Detect Threshold Voltage
V
V
2.4
2.4
3.7
3.7
5.0
5.0
OC(limit)
Ooff(th)
output-on open-load Detect Current
I
mA
Oon(th)
(V
PWR
(V
PWR
(V
PWR
= 13 V, V = 5.0 V, T = – 40°C)
in
20
20
20
80
75
65
190
130
100
C
= 13 V, V = 5.0 V, T = + 25°C)
in
C
= 13 V, V = 5.0 V, T = +125°C)
in
C
DYNAMIC ELECTRIC CHARACTERISTICS
Characteristic
Symbol
Min
Typ
Max
Unit
OUTPUT TIMING
Output Driver Rise Time (V
CC
t = Output Voltage change from 90% to 10%, see Figure 2)
r
= 13 V, R = 13 Ω,
t
µs
µs
µs
L
r
—
—
2.3
1.5
10
10
Output Driver Fall Time (V
= 13 V, R = 13 Ω,
t
f
CC
L
t = Output Voltage change from 10% to 90%, see Figure 2)
f
Output Delay Time (V
= 13 V, R = 13 Ω,
L
CC
= V at 3.0 V to V at 90%, see Figure 2)
t
t
t
on(dly)
off(dly)
—
—
3.2
5.9
10
15
on(dly)
off(dly)
in
O
O
= V at 1.0 V to V at 10%, see Figure 2)
t
in
FAULT TIMING
Over-Current Sense Time (See Figure 5 or 6)
(V = 5.0 V, R = 0.05 Ω, V = 14.5 V,
t
µs
ms
ms
oc
10
55
250
7.0
in
L
PWR
over-current duty cycle ≤ 10%
t
= time that V is > 1.0 V)
oc
Over-Current Refresh Time (See Figures 5 or 6)
(V = 5.0 V, R = 0.05 Ω, V = 14.5 V,
Status
t
ref
1.5
3.6
in
L
PWR
over-current duty cycle ≤ 10%
t
= time that V is < 1.0 V)
ref
Status
Output Open-Load Fault Status Delay Time
(V
(V
= 13 V, V = 5.0 V, open-load on Output,
in
t
os(on)
PWR
t
= time from V = 3.0 V to V
= 1.0 V, see Figure 3)
1.0
1.0
2.2
19
4.0
40
os(on)
in
Status
= 13 V, V = 0 V, open-load on Output,
t
µs
µs
PWR
in
os(off)
t
= time from V = 2.5 V to V
in
= 1.0 V, see Figure 4)
Status
os(off)
Fault Status Reset Delay Time
(V = 13 V, V = 0 V, see Figure 4)
t
s(reset)
—
2.0
10
PWR in
NOTE: 1. Negative current signifies current flowing out of device.
t
4
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Figure 1. Fuel Injector Application Block Diagram
+14V
V
MC68HC11A1
Load
(Battery)
7
Input 1
Input 2
Overvoltage
Shutdown
Bias
OC 2
Bias
Circuit
3
4
Injector 1
(14 , 10mH)
(1)
Ω
23µA
OC 3
OC 4
OC 5
PD 0
2
Gate
Control
Input 3
G2
G3
G4
13
12
5
Input 4
I
Input 1 & 2
Limit
Open
Load
Detect
R
S
Select
PD 1
PD 2
Injector 2
(14 , 10mH)
6
(1)
Short
Circuit
Detect
Ω
23µA
Input 3 & 4
1
11
11
µA x 7
Open
Load
Detect
IRQ
G2
I
Limit
Short
Circuit
Detect
R
S
100µA
Injector 3
(14 , 10mH)
Fault
(1)
Ω
23µA
Fault
Encoder
10
14
Open
Load
Detect
G3
Short
Circuit
Detect
I
Limit
R
S
Injector 4
(14 , 10mH)
(1)
Ω
23µA
15
Open
Load
G4
Detect
NOTE: 1. The MC33293A
is also designed to drive
the 194 type incandescent
instrument lamp.
Short
Circuit
Detect
I
Limit
R
S
8
5
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Figure 2. Switching Speed Test Circuit and Response Times
13V
13V
V
load
Test Circuit
13Ω
V
PWR
7
3
4
13
2
1
14
15
V
Out 1
Out 2
Out 3
Input 1
Input 2
Input 3
O
V
10V
Input
in
50Ω
12
Input 4
Out 4
Input
10
Status
50Ω
MC33293A
Input 1 & 2
Input 3 & 4
Select
0V
5
11
6
8
Gnd
100µs
2% Duty Cycle
Gnd
Response Times
5.0V
3.0V
V
in
1.0V
0V
t
t
off
on
t
t
t
f
off(dly)
t
on(dly)
r
13V
90%
V
O
10%
0V
6
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Figure 3. Fault Status Operation with an Output-On, Open-Load Fault
5.0V
3.0V
V
in
1.0V
0V
5.0V
V
Status
1.0V
0V
t
*
os(on)
Open Load
Fault Reported
1.0A
(Normal Load)
I
O
I
Oon(th)
0A
Open Load
Fault Ends
* If the open occurs after the output has been on,
the delay time is much less than t
.
os(on)
NOTE: Rise and fall times are exaggerated for emphasis.
Figure 4. Fault Status Operation with an Output-Off, Open-Load Fault
5.0V
V
2.5V
in
0V
t
s(reset)
5.0V
V
3.0V
Status
(All Outputs Off)
1.0V
0V
t
*
os(off)
Open Load
Fault Reported
V
load
V
V
Ooff(th)
O
0V
Open Load
Fault Ends
* If the open occurs after the output has been off, the
delay time is much less than t
.
os(off)
NOTE: Rise and fall times are exaggerated for emphasis.
7
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Figure 5. Fault Status Operation with Turn On into an Over-Current Load
5.0V
3.0V
V
in
0V
5.0V
V
Status
Fault
1.0V
0V
t
t
oc
ref
I
DS(limit)
I
O
Over-Current
condition Ends
1.0A
(Normal Load)
Output
Shutdown
0A
Over-Current
condition at Turn On
Refresh
(Turn on and test load)
NOTE: Rise and fall times are exaggerated for emphasis.
Figure 6. Fault Status Operation with Over-Current Load after Turn On
5.0V
3.0V
V
in
0V
5.0V
V
Status
Fault
1.0V
1.0V
oc
0V
t
t
ref
I
DS(limit)
I
O
Output
Shutdown
Output
1.0A
0A
Shutdown
Refresh
(Turn on and test load)
Over-Current
condition occurs
NOTE: Rise and fall times are exaggerated for emphasis.
8
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Figure 7. Turn On Threshold Voltage
versus Temperature
Figure 8. Output On Resistance
versus Temperature
6.0
5.0
0.30
V
V
V
= V
on(th)
PWR
= 14.5 V
I
V
V
= 1.0 A
D
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
DS
= 5.0 V
= 13 V
PWR
= 5.0 V
in
in
4.0
3.0
2.0
1.0
0
0.12
0.10
– 55
– 55
– 25
0
25
50
75
100
125
– 25
0
25
50
75
100
125
T , AMBIENT TEMPERATURE (
°C)
T , AMBIENT TEMPERATURE (
°C)
A
A
Figure 9. Drain Source Clamp Voltage
versus Temperature
Figure 10. Zero Input Voltage Drain Current
versus Temperature
80
76
72
80
70
V
V
V
= BV
DS
DSS
= 14.5 V
V
V
V
= 25 V
= 14.5 V
DS
PWR
= 0 V
PWR
= Open
in
in
60
50
40
30
20
68
64
60
10
0
– 55
– 25
0
25
50
75
100
125
– 55
– 25
0
25
50
75
100
125
T , AMBIENT TEMPERATURE (
°C)
T , AMBIENT TEMPERATURE (
°C)
A
A
Figure 11. Current Limit
versus Temperature
Figure 12. Open-Load Threshold
versus Temperature
5.0
4.5
4.0
6.0
5.5
5.0
V
V
V
= 2.8 V
= 13 V
= 5.0 V
V
= 13 V
= 13 V
DS
PWR
in
DS
V
V
PWR
= 0 V
in
4.5
4.0
3.5
3.0
2.5
3.5
3.0
– 55
– 25
0
25
50
75
100
125
– 55
– 25
0
25
50
75
C)
100
125
T , AMBIENT TEMPERATURE (
°C)
T , AMBIENT TEMPERATURE (
°
A
A
9
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
PIN DESCRIPTION
Pin
Function
Description
Output 2
1
This is one of four open drain power MOSFET output connections. The load is connected from
this pin to the positive voltage supply.
Output 1
Input 1
2
3
4
5
This is one of four open drain power MOSFET output connections. The load is connected from
this pin to the positive voltage supply.
This input controls the turn ON and turn OFF of Output 1 when the Single/Dual pin is at a logic
low level. It is a CMOS input with an internal active pull-down employed for noise immunity.
Input 2
This input controls the turn ON and turn OFF of Output 2 when the Single/Dual pin is at a logic
low level. It is a CMOS input with an internal active pull-down employed for noise immunity.
Input 1 & 2
This input controls the turn ON and turn OFF of Output 1 and Output 2 when the Single/Dual
select pin is at a logic high level. It is a CMOS input with an internal active pull-down employed
for noise immunity.
Single/Dual
Select
6
7
This input selects between the single (one input controls one output) mode and the dual
(one input controls two outputs) mode of operation.
V
PWR
The power (voltage and current) to operate the IC is supplied through this pin. The MC33293A
is designed to operate over a voltage range of 5.5 V to 30 V.
Ground
N/C
8
9
IC ground reference pin.
No connection.
Fault
10
One of three fault conditions, Output-On Open-Load, Output-Off Open-Load or Over-Current are
reported at this output. A logic low state signals the existence of a fault condition. This output
has an internal active pull-up and does not require an external pull-up resistor.
Input 3 & 4
11
This input controls the turn ON and turn OFF of Output 3 and Output 4 when the Single/Dual
select pin is at a logic high level. It is a CMOS input with an internal active pull-down employed
for noise immunity.
Input 4
Input 3
12
13
14
15
This input controls the turn ON and turn OFF of Output 4 when the Single/Dual pin is at a logic
low level. It is a CMOS input with an internal active pull-down employed for noise immunity.
This input controls the turn ON and turn OFF of Output 3 when the Single/Dual pin is at a logic
low level. It is a CMOS input with an internal active pull-down employed for noise immunity.
Output 3
Output 4
This is one of four open-drain power MOSFET output connections. The load is connected from
this pin to the positive voltage supply.
This is one of four open-drain power MOSFET output connections. The load is connected from
this pin to the positive voltage supply.
CIRCUIT DESCRIPTION
Introduction
power-up, no load is turned on before a logic high appears on
an input pin. Fault reporting is through the use of an
The MC33293A is a four output low side switch originally
intended for use in automotive applications as a fuel injection
driver. This circuit can be used in a variety of applications. It
is parametrically specified over a battery voltage range of
9.0 V to 14.5 V, but is designed to operate over a
considerably wider range of 5.5 V to 30 V. The design
incorporates the use of logic level MOSFETs as output
devices which are fully enhanced at a gate voltage of 5.0 V,
eliminating the need for internal charge pumps. Each output
is identically sized and is independent in operation. The
efficiency of each output device is such that with as little as
open-drain MOSFET having a 100 µA internal active pull-up.
All inputs incorporate true logic (or positive logic). This
means that whenever an input is in a logic low state (< 0.8 V)
the corresponding output will be in an OFF state. Conversely,
whenever an input is in a logic high state (> 3.0 V), the
corresponding output will be in an ON state.
Single/Dual Select
The Single/Dual Select pin can be used to switch between
completely independent control and control of the outputs in
pairs. Whenever the Single/Dual Select pin is in a logic low
state, Inputs 1, 2, 3 and 4 control Outputs 1, 2, 3 and 4,
respectively. In this mode, only Inputs 1, 2, 3 and 4 can
exercise individual control over their respective output.
Hence the term “single select” mode of operation. Input 1 & 2
(Pin 5) and Input 3 & 4 (Pin 11) have no control whenever the
Single/Dual Select pin is in a logic low state.
9.0VofV
applied,theR is0.18Ωtypically,atroom
PWR
DS(on)
temperature and increases to only 0.22 Ω as V
PWR
decreases to 5.5 V.
All inputs of the MC33293A are CMOS and have individual
11 µA internal active pull-downs. This eliminates the need for
external pull-down resistors to prevent false switching due to
noise on the input control lines. This also ensures that at
10
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
When the Single/Dual Select pin is held at a logic high
be operated with all outputs (and therefore all inputs) tied
together but modified operation is to be expected. With all
inputs tied together and depending on the dual or single
select mode used, the paralleled input control current will
either be twice (with the dual mode selected) or four times
(with the single mode selected) that of any single input. Other
state, Control Inputs 1, 2, 3 and 4 are turned OFF and can not
exercise any control over the outputs. In this mode, input
control transfers from a single to a dual mode of operation,
wherein only Input 1 & 2 and Input 3 & 4 have control of
Output 1 plus Output 2, and Output 3 plus Output 4,
respectively. Hence the term “Dual Select” mode of
operation.
expected differences are: R
will decrease by a factor of
DS(on)
four while the Output-On Open-Load Detect current and the
Output Limiting current will increase by a factor of four. There
will be no change in the Over-Voltage Shutdown Range or
the Output-Off Output-On Open-Load Detect Threshold
Voltage Range. As always, system level thermal design and
verification are important when outputs are paralleled.
Paralleling Outputs
Paralleling outputs may be desirable in the event the
application requires a lower R
switching capability than a single output. The MC33293A can
or higher current
DS(on)
FAULT LOGIC OPERATION
General
Fault, output-off open-load Fault and over-current Fault. All
faults from any of the four outputs are OR’d together and
reported by the single Fault Status output-on Pin 10
(Figure 13).
The Fault Status output (Pin 10) on the MC33293A reports
any one of three possible faults from any one of the four
outputs. The three possible faults are output-on open-load
Figure 13. MC33293A Fault Logic Diagram
Output-Off open-load Fault Report 1
Output-Off open-load Fault Report 2
Output-Off open-load Fault Report 3
Output-Off open-load Fault Report 4
100µA
Fault
Input 1
Input 2
Input 3
Input 4
Single/Dual Select
Input 1 & 2
Input 3 & 4
output-on open-load Fault Report 1
output-on open-load Fault Report 2
output-on open-load Fault Report 3
output-on open-load Fault Report 4
output-on Over-Current Fault Report 1
output-on Over-Current Fault Report 2
output-on Over-Current Fault Report 3
output-on Over-Current Fault Report 4
11
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Output-On open-load Fault
Using Equation 2 for the transient case,
when: V
R
= 14 V
load
DS(on)
= 10 mH
The MC33293A always checks for an open-load on the
outputs whether the outputs are ON or OFF. An output-on
open-load Fault is detected if an open-load exists when the
output is ON (corresponding input at a logic high state). The
output-on open-load Fault detection occurs when the load
current is less than the minimum Output-On Open-Load
= 0.3 Ω
L
R
load
= 14 Ω
= 75 mA
load
I
Oon(th)
an output-on open-load Fault will be detected, but not
reported after initial turn ON for a duration of 57 µs + t
.
on
Detect current (I
), specified in this data sheet. The
Oon(th)
is, typically, 75 mA at room temperature.
value of I
Oon(th)
See Figure 3.
The minimum load resistance value that the MC33293A
will interpret as an output-on open-load (R ) is a
Output-Off open-load Fault
The MC33293A checks for open-loads on the outputs
regardless of an output being on or off. An output-off
open-load Fault is detected if an open-load exists when the
output is turned OFF (corresponding input at a logic low
state). When any one of the four outputs are turned OFF, an
independent internal current source tied to each output tries
to pull a small amount of zero input voltage drain current
open(on)
function of; the Output-On Open-Load Detect current
(I ); the load supply voltage (V ); and the resistance
Oon(th)
load
), as shown below.
of the output (R
R
DS(on)
open(on)
R
= [V
/ I
/ I
] –
load Oon(th)
(1)
≈ V
DS(on)
load Oon(th)
(I
, typically 23 µA), through the load. If, while this zero
DS(off)
Using Equation 1 for the steady state case,
input voltage drain current is being pulled through the load,
the output voltage is less than the output-off open-load
when: V
R
= 14 V
load
= 0.3 Ω
DS(on)
Oon(th)
Detect Threshold Voltage (V
output-off open-load Fault will be detected.
, typically 3.7 V), an
Ooff(th)
I
= 75 mA
an output-on open-load Fault will be detected and reported
The zero input voltage drain current could be provided by
a large external resistor connected from the output to ground.
However, if an external resistor were used to provide this
zero input voltage drain current, only “opens” resulting from
open-loads or output to ground shorts could be detected. The
external resistor could not guarantee detection of an open
resulting from an output wire bond failure internal to the
MC33293A. Because the current source is provided
internally, open loads, output to ground shorts, and loss of
output wire bonds will all be detected.
whenever R
≥ 187 Ω.
load
Each output has an output-on open-load fault detect circuit
that performs real time load current monitoring. Load current
is monitored immediately after any output is turned ON.
Since it takes a finite amount of time for load current to begin,
the MC33293A detects an output-on open-load Fault from
the time the output is turned ON until the load current
exceeds the Output-On Open-Load Detect current (I
).
Oon(th)
It is important to note that a fault will not be reported at the
Fault Status output during this short period of time. This is
due to the built-in output-on open-load Fault Status Delay
The value of load resistance that will be detected as an
output-offopen-load(R
voltagedraincurrent(I
),isafunctionofthezeroinput
);
open(off)
Time (t
), see Figure 3. This delay time is incorporated in
oson
);theloadsupplyvoltage(V
DS(off)
load
the MC33293A to mask the reporting of a false output-on
open-load Fault at the Fault Status output. The delay is
typically 2.2 ms.
and the output-off open-load Detect Threshold Voltage
(V ), as shown next by:
Ooff(th)
[V
– V
]
(6)
load
Ooff(th)
The purpose for the t
delay is to prevent false fault
R
=
os(on)
open(off)
I
DS(off)
Using Equation 6 for the steady state case,
when: V = 14 V
reporting, especially when driving inductive loads. The load
inductance causes a current lag when the load is turned ON.
The normal current lag of an inductive load could be
misinterpreted as an open-load if it weren’t for the built-in
delay. This delay or masking is accomplished internally with
a single timer which resets every time any input switches from
a low-to-high logic state. An output-on open-load Fault will be
reported by the Fault Status output as a result of turning ON
an output having an open-load Fault and the most recent
load
DS(off)
I
V
= 23 µA
= 3.7 V
Ooff(th)
an output-off open-load Fault will be detected and reported
whenever R ≥ 448 kΩ.
L
Each output has an output-off open-load fault detect circuit
that performs real time output voltage monitoring. Output
voltage is monitored immediately after any output is turned
off. A finite amount of time is required for output voltage to
rise. The MC33293A detects an output-off open-load Fault
from when an output is turned off until the output voltage
exceeds the output-off open-load Detect Threshold Voltage
t
is allowed to lapse after switching ON any input.
os(on)
The time it takes the load current to reach I
is a
Oon(th)
function of the load resistance (R
(L ); output on resistance (R
(V
of t is comprised of the low-to-high V propagation delay
time (t
); load inductance
load
); load supply voltage
load DS(on)
); and the turn-on time (t ) as shown below. The value
load on
(V
). It is important to note a fault will not be reported at
Ooff(th)
the Fault Status output during this rise time. This is due to the
built-in output-off open-load Fault Status Delay Time, t
on
in
), and the output voltage rise time (t ).
on(dly)
r
,
os(off)
See Figure 2.
see Figure 4. This delay time is incorporated in the
MC33293A to delay the reporting of an output-off open-load
Fault at the Fault Status Output. The delay is typically 19 µs.
t
= – τ ln [(I
)] + t
load on
– I )/
Oon(th) load
on(false fault)
(– I
(2)
where: τ = L
load
/ R
load
= time constant
+ R ]
DS(on)
(3)
(4)
(5)
I = V
load
= t
/ [R
load
load
t
+ t
r
on on(dly)
12
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
The purpose for the t
os(off)
delay is to prevent false fault
load current exceeds the internal current limit value (typically
4.0 A). An over-current condition activates the current limit
circuit. This circuit then sends an analog signal to the gate
control circuit, lowering the voltage on the output transistor’s
gate. Lowering the gate voltage forces the output transistor to
transition from the resistive (fully enhanced) mode of
operation to the current limit (between fully enhanced and
fully OFF) mode.
The actual detection of an over-current condition does not
occur at the initial onset of current limit. The onset of current
limit causes the voltage on the affected output to increase.
The actual Over-Current detection occurs when the output
voltage increases and exceeds the over-current Detect
reporting experienced with capacitance type loads. The load
capacitance causes the rise in output voltage to lag even
after the load has been turned OFF. The normal voltage lag
caused by load capacitance could be misinterpreted as an
open-load if it weren’t for the built-in delay. This delay, or
masking, is accomplished with four separate timers that reset
independent of each other when the corresponding input is
switched from a high to a low logic state. Internal logic
prevents an output-off open-load Fault from being reported at
the Fault pin when any input is high. An output-off open-load
Fault will be reported at the Fault Status pin after an open
load occurs, all inputs not corresponding to the faulted output
are low and a time in excess of t
is exceeded after
Voltage Threshold (V
corresponding input signal is in a logic high state.
After detection, the reporting of an over-current Fault at
the Fault Status output is delayed by a time equal to the
over-current Sense Time (t ), see Figures 5 and 6. This
delay time is typically 55 µs. If the over-current condition no
longer exists after the over-current Sense Time has passed,
then no fault is reported. The purpose of the Fault reporting
delay is to blank any false faults that might be reported due to
high inrush current loads such as incandescent lamps. If the
over-current condition still exists after the delay time has
passed, then a fault will be reported at the Fault Status output
and the affected output is turned OFF.
The Over-Current Sense Time is accomplished internally
with four separate timers that reset and start independent of
each other whenever a corresponding output is turned ON,
either due to the corresponding input turning ON or the
, typically 3.7 V), while the
os(off)
OC(limit)
switching OFF the input corresponding to the faulted output.
An important note that bears repeating is that an output-off
open-load Fault will not be reported at the Fault Status pin
unless all input pins are at a logic low state (Figure 13). This
is a Fault Status interrogation feature. It helps in
distinguishing between an output-on open-load Fault and an
output-on over-current Fault. (Fault Status interrogation is
explained in greater detail in a later section).
oc
The time the output voltage takes to reach V
after
. It is a function of the load
); load inductance (L
load load
Ooff(th)
being turned OFF is t
off false fault
resistance (R
(I
); load current
), output capacitance
); output-on resistance (R
load
(C );loadsupplyvoltage(V
DS(on)
);andtheturnOFFtime(t ).
O
load
off
The value of t
off
is comprised of the V high-to-low
in
propagation delay time (t
), and the output voltage fall
off(dly)
time (t ).
f
For the case when:
completion of the over-current Refresh Time (t ) explained
ref
2
2
1/2 L
(I
) >> 1/2 C (V
)
(7)
(8)
in the next paragraph, (see Figures 5 and 6). An over-current
Fault will be reported at the Fault Status output when an
over-current condition is detected and a lapse time in excess
load load
O
Ooff(th)
] + t
off
t
= [(C ∆V) / I
O load
off false fault
where: I
= V
/ [R
load
+ R
R
]
(9)
load
load
DS(on)
]
of t is exceeded after turning ON the affected output.
oc
∆V = V
– [I
(10)
(11)
At the same time the over-current Fault is reported, a
Ooff(th)
+ t
load DS(on)
single internal over-current refresh timer resets, causing
over-current outputs to be turned OFF for a duration of t
typically 3.6 ms. After a time t , the faulted output(s) will be
ref
turned ON again to check if the over-current condition still
exists. If the over-current condition still exists, the output(s)
any
t
= t
off off(dly)
f
,
ref
Using Equation 7 for the transient case,
when: V
R
= 14 V
load
DS(on)
= 10 mH
= 0.3 Ω
L
R
C
load
will be turned OFF again after a time t . This periodic retry
continues turning ON and OFF over-current loads at a duty
oc
= 14 Ω
= 0.001 µF
load
O
cycle of t /(t + t ) with a period of t + t until either the
oc oc ref
oc ref
V
= 3.7 V
Ooff(th)
input is turned OFF or the over-current condition is removed.
Any subsequent over-current conditions will reset and restart
an Output-Off open-load Fault will be detected but not
reported after initial turn OFF for a duration of 3.5 ns + t
.
off
the t timer.
ref
From Equation 7, the energy stored in the load inductor will
be 4.8 mJ. This is much greater than the 68 nJ needed to
charge the output capacitance. This allows the use of
Equation 8 in determining the false output-off open-load Fault
duration following turn OFF because it assures that the
output capacitance will be charged by the energy stored in
the load inductance.
Detection of an over-current condition coincides with, but
does not occur until after the onset of current limit. This
allows a specific but small current limit range to go
undetected. The factors that determine the value of load
resistance causing an over-current condition to be detected
are: the Output-Load Current Limit [I
]; load voltage
DS(limit)
); and the Over-Current Detect Threshold Voltage
(V
load
[V
OC(limit)
] as shown below:
[V
Over-Current Fault
– V
]
load
OC(limit)
(12)
An over-current (short circuit or current limit) Fault is the
detection and reporting of any output over-current condition.
An over-current condition is defined as a condition where
R
load(detect) =
I
DS(limit)
13
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
The factors that determine the value of load resistance
that will cause the onset of current limit are: I , V
at a logic low state) after t
open-load Fault (R
load
This type of interrogation is possible because an output-off
open-load Fault can only be reported when all the inputs are
in a logic low state.
For an over-current Fault, the next step is to determine
which single output is affected. After all inputs are turned
OFF and the fault status resets, each input is then turned ON
then OFF sequentially. A Fault will again be reported when
the input to the corresponding Over-Current output is turned
has lapsed, then an
≥ 447 kΩ, typical) is being reported.
s(reset)
,
DS(limit) load
and R
, as shown below.
DS(on)
R
= [V
/ I
] – R
DS(on)
(13)
load(limit)
load DS(limit)
For the case when: V
= 14 V
load
V
R
= 3.7 V
OC(limit)
= 0.3 Ω
= 4.0 A
DS(on)
I
DS(limit)
an over-current condition will be detected for any load
resistance such that R
≤ 2.6 Ω. An undetected current
load
limit condition will occur any time 2.6 Ω ≤ R
ON and t
has lapsed. If the dual input mode is being
os(on)
≤ 3.2 Ω. Notice
load
used, an over-current Fault can only be interrogated down to
the two outputs being driven together.
that the undetected current limit range is quite small.
Fault Interrogation
For an open-load Fault (R
≥ 447 kΩ, typical)
load
interrogation, all inputs are turned OFF and the fault status
remains set. Each input is then turned ON and OFF
sequentially. The Fault status will remain set when the input
Even though the MC33293A incorporates a single Fault
Status Output pin for reporting three different fault conditions,
a real time interrogation routine can be used to determine
which one of the three Fault conditions is being reported and
which single output is affected.
An important point to note about Fault interrogation is that
only one fault on a single output can be interpreted. In other
woRDS, if more than one over-current or open-load Fault
exists among the four outputs, it is not possible to distinguish
which outputs have a fault and which do not. It is very
unlikely, however, that more than one output will be faulted at
the same time.
to the corresponding faulted output is turned ON and t
os(on)
has lapsed. If the dual input mode is used, an open-load Fault
can only be interrogated down to the two outputs driven
together.
From the example following Equation 1, the typical value
of R
is 187 Ω. From the example following Equation
open(on)
6, the typical value of R
is 447 kΩ. Therefore, if the
open(off)
load resistance is between 187 Ω and 447 kΩ typically, an
output-on open-load Fault will be reported at the Fault Status
output but an output-off open-load Fault will not. This
condition is referred to as a soft open fault. If a soft open fault
exists, it is reported at the Fault Status output the same as an
over-current Fault except for the reporting delay time. A soft
open fault has a reporting delay time of 2.2 ms typically, and
an over-current Fault has a reporting delay time of only 55 µs
typically, after the input to the faulted output is turned ON.
When a Fault is reported, the first step is to determine if it
is an over-current or open-load Fault (R
≥ 447 kΩ,
load
typical). This is done by taking all the inputs (single or dual) to
a logic low state. If the Fault Status resets (changes to a
logic high state) after the Fault Status Reset Delay Time
(t
seeFigure4)haslapsed, thenanover-currentFault
s(reset),
is being reported. If the Fault Status does not reset (remains
14
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
Figure 14. Truth Table
Inputs
Outputs
3
Conditions of Outputs
Non-Faulted Operation
1
2
3
4
S/D 1 & 2 3 & 4
1
2
4
Fault
L
L
L
L
L
L
L
L
H
H
L
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
L
L
L
H
H
H
H
L
H
H
L
H
L
L
L
H
L
L
L
H
H
L
L
H
L
L
H
L
L
L
H
H
H
H
H
H
H
H
X
X
X
X
H
H
H
H
L
H
H
L
H
L
L
L
H
L
L
L
H
H
L
L
H
L
L
H
L
L
L
H
H
H
H
X
X
X
X
L
H
H
L
H
L
L
H
L
L
L
H
H
X
X
X
X
L
L
H
L
H
X
X
X
X
L
L
L
H
L
H
L
H
H
L
H
H
L
H
L
L
H
H
H
L
H
L
H
L
L
open-load Fault On Output 1
L
H
L
L
L
L
L
L
L
L
L
L
X
X
X
X
L
X
X
X
X
L
L
L
L
L
L
L
L
L
H
H
L
H
H
L
H
H
L
L
L
H*
L
H
H
X
X
X
X
H
H
X
X
X
X
H
H
X
X
X
X
H
X
X
X
X
L
L
L
L
H
H
H
H
H
L
H
H
L
H
H
L
L
H
L
L
L
H
H
H
L
H*
L
H
L
L
Over-Current Fault On Output 1
L
H
L
L
L
L
L
L
L
L
L
L
X
X
X
X
L
X
X
X
X
L
H
H
H
H
H
H
H
H
H
H
L
H
H
L
H
H
L
H
L
H
L
H
H
X
X
X
X
H
H
X
X
X
X
H
H
X
X
X
X
H
X
X
X
X
L
L
L
L
H
H
H
H
H
L
H
H
L
H
H
L
H
L
H
L
L
H
H
H
L
H
L
H
L
L
*NOTE: All inputs must be a logic low state for an Output-Off open-load Fault to be reported.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applicationsintended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
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are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
15
MOTOROLA ANALOG IC DEVICE DATA
MC33293A
OUTLINE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 821D–03
ISSUE C
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION R DOES NOT INCLUDE MOLD FLASH
OR PROTRUSIONS.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH
OR PROTRUSIONS.
Q
–L–
SEATING
–T–
PLANE
C
B
5. MOLD FLASH OR PROTRUSIONS SHALL NOT
EXCEED 0.010 (0.250).
E
–P–
U
6. DELETED
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION SHALL
BE 0.003 (0.076) TOTAL IN EXCESS OF THE D
DIMENSION. AT MAXIMUM MATERIAL CONDITION.
A
R
K
INCHES
MIN MAX
MILLIMETERS
MIN MAX
DIM
A
B
C
D
E
0.681
0.784
0.173
0.024
0.058
0.016
0.694 17.298 17.627
0.792 19.914 20.116
0.181
0.031
0.062
0.023
Y
PIN 1
PIN 15
4.395
0.610
1.473
0.407
4.597
0.787
1.574
0.584
G
H
F
7X F
G
H
J
K
Q
R
U
Y
0.050 BSC
0.110 BSC
1.270 BSC
2.794 BSC
0.458 0.609
1.086 27.382 27.584
0.151 3.760 3.835
0.426 10.567 10.820
15X D
15X J
S
0.018
1.078
0.148
0.416
0.024
M
L
0.010 (0.254)
T
P
M
0.024 (0.610)
T
0.110 BSC
0.503 REF
2.794 BSC
12.776 REF
TV SUFFIX
PLASTIC PACKAGE
CASE 821C–04
ISSUE D
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION R DOES NOT INCLUDE MOLD FLASH
OR PROTRUSIONS.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH
OR PROTRUSIONS.
SEATING
PLANE
–T–
M
–Q–
5. MOLD FLASH OR PROTRUSIONS SHALL NOT
EXCEED 0.010 (0.250).
6. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION SHALL
BE 0.003 (0.076) TOTAL IN EXCESS OF THE D
DIMENSION. AT MAXIMUM MATERIAL CONDITION.
C
B
E
–P–
U
INCHES
MIN MAX
MILLIMETERS
MIN MAX
A
DIM
A
B
C
D
E
G
H
J
K
L
M
R
S
Y
K
R
0.684
0.784
0.173
0.024
0.058
0.694 17.374 17.627
0.792 19.914 20.116
0.181
0.031
0.062
V
4.395
0.610
1.473
4.597
0.787
1.574
S
PIN 15
PIN 1
0.050 BSC
1.270 BSC
4.293 BSC
0.458 0.609
0.710 17.780 18.034
5.080 BSC
3.760 3.835
0.426 10.567 10.820
0.169 BSC
G
0.018
0.700
0.024
H
15X D
0.200 BSC
L
S
M
Q
0.010 (0.254)
T
P
0.148
0.416
0.157
0.105
0.151
15X J
0.024 (0.610)
0.167
0.115
3.988
2.667
4.242
2.921
M
T
U
V
0.868 REF
22.047 REF
Y
0.625 0.639 15.875 16.231
How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;
JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,
P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454
3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315
MFAX: RMFAX0@email.sps.mot.com – TOUCHTONE 602–244–6609
INTERNET: http://Design–NET.com
ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
MC33293A/D
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