2557_06 [ALLEGRO]
PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE; 具有故障检测和睡眠模式保护QUAD低侧驱动器
| 型号： | 2557_06 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE |
| 文件： | 总12页 (文件大小：1519K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2557
PROTECTED QUAD LOW-SIDE DRIVER
WITH FAULT DETECTION and SLEEP MODE
The A2557xB, A2557xEB, and A2557xLB have been specifically
A2557xLB (SOIC)
designed to provide cost-effective solutions to relay-driving applications with
up to 300 mA drive current per channel. They may also be used for driving
incandescent lamps in applications where turn-on time is not a concern. Each
of the four outputs will sink 300 mA in the on state. The outputs have a
minimum breakdown voltage of 60 V and a sustaining voltage of 40 V. A
low-power Sleep Mode is activated with either ENABLE low or all inputs
low. In this mode, the supply current drops to below 100 µA.
1
2
3
4
16
IN
IN
OUT
1
2
1
2
15
14
K
ENABLE
OUT
Over-current protection for each channel has been designed into these
devices and is activated at a nominal 500 mA. It protects each output from
short circuits with supply voltages up to 32 V. When an output experiences a
short circuit, the output current is limited at the 500 mA current clamp. In
addition, foldback circuitry decreases the current limit if an excessive voltage
is present across the output and assists in keeping the device within its SOA
(safe operating area). An exclusive-OR circuit compares the input and output
state of each driver. If either a short or open load condition is detected, a
single FAULT output is turned on (active low).
13
12
11
10
9
GROUND
GROUND
GROUND
5
6
GROUND
OUT
V
3
CC
7
8
FAULT
OUT
IN
IN
3
4
4
Continuous or multiple overload conditions causing the channel tempera-
ture to reach approximately 165°C will result in an additional linear decrease
in the output current of the affected driver. If the fault condition is corrected,
the output stage will return to its normal saturated condition.
Dwg. PP-017-4
Note that the A2557xB (DIP) and the A2557xLB
(SOIC) are electrically identical and share a
common terminal number assignment.
The packages offer fused leads for enhanced thermal dissipation. Package
B is 16-pin power DIP with exposed tabs, EB is 28-lead power PLCCs, and
LB are 16-lead power wide-body SOICs for surface-mount applications. The
lead (Pb) free versions have 100% matte tin leadframe plating.
ABSOLUTE MAXIMUM RATINGS
Output Voltage, VO .............................. 60 V
Over-Current Protected Output Voltage,
VO ..................................................... 32 V
Output Current, IO ......................... 500 mA*
FAULT Output Voltage, VFLT ............. 60 V
Logic Supply Voltage, VCC ................. 7.0 V
Input Voltage, VI or VOE ..................... 7.0 V
Package Power Dissipation,
FEATURES
■ 300 mA Output Current per Channel
■ Independent Over-Current Protection &Thermal Limiting for Each Driver
■ Output Voltage to 60 V
PD ........................................... See Graph
Operating Temperature Range, TA
Suffix ‘S-’ ...................... -20°C to +85°C
Suffix ‘E-’ ...................... -40°C to +85°C
Suffix ‘K-’ ................... -40°C to +125°C
Junction Temperature,
TJ ............................................... +150°C*
Storage Temperature Range,
■ Output SOA Protection
■ Fault-Detection Circuitry for Open or Shorted Load
■ Low Quiescent Current Sleep Mode
■ Integral Output Flyback/Clamp Diodes
■ TTL- and 5 V CMOS-Compatible Inputs
TS ................................. -55°C to +150°C
*Outputs are current limited at approximately
500 mA per driver and junction temperature
limited if higher current is attempted.
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
Selection Guide
Part Number
Pb-free
Package
Ambient Temperature
(°C)
A2557SB
–
Yes
–
Yes
–
16-pin DIP,exposed tabs
16-pin DIP,exposed tabs
28-lead PLCC
28-lead PLCC
16-lead SOIC
–20 to 85
–20 to 85
–20 to 85
–20 to 85
–20 to 85
–20 to 85
A2557SB-T
A2557SEB
A2557SEB-T
A2557SLB
A2557SLB-T
Yes
16-lead SOIC
A2557EB
–
Yes
–
Yes
–
16-pin DIP,exposed tabs
16-pin DIP,exposed tabs
28-lead PLCC
28-lead PLCC
16-lead SOIC
–40 to 85
–40 to 85
–40 to 85
–40 to 85
–40 to 85
–40 to 85
A2557EB-T
A2557EEB
A2557EEB-T
A2557ELB
A2557ELB-T
Yes
16-lead SOIC
A2557KB
–
Yes
–
Yes
–
16-pin DIP,exposed tabs
16-pin DIP,exposed tabs
28-lead PLCC
28-lead PLCC
16-lead SOIC
–40 to 125
–40 to 125
–40 to 125
–40 to 125
–40 to 125
–40 to 125
A2557KB-T
A2557KEB
A2557KEB-T
A2557KLB
A2557KLB-T
Yes
16-lead SOIC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
FUNCTIONAL BLOCK DIAGRAM
FAULT
K
ENABLE
SLEEP
CONTROL
60 µA
COMMON CONTROL
ONE OF FOUR DRIVERS
V
CC
–
+
2.5 V
OUT
N
IN
N
CURRENT
LIMIT
THERMAL
LIMIT
30 µA
<<1 Ω
Dwg. FP-007-2
A2557xEB (PLCC)
5
4
3
R
= 6°C/W
θJT
NC
GROUND
5
25
24
23
22
GROUND
SUFFIX 'EB', R
= 36°C/W
θJA
6
7
SUFFIX 'B', R
= 43°C/W
θJA
8
2
1
0
9
21
10
11
20
19
GROUND
GROUND
V
NC
CC
SUFFIX 'LB', R
50
= 90°C/W
θJA
75
100
125
150
25
°
TEMPERATURE IN C
Dwg. PP-019-2
Dwg. GP-004-2B
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1998, 2006 Allegro MicroSystems, Inc.
3
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
ELECTRICAL CHARACTERISTICS over operating temperature range, V = 4.75 V to 5.25 V
CC
Limits
Characteristic
Symbol
Test Conditions
VO = 60 V, VI = 0.8 V, VOE = 2.0 V
VO = 60 V, VI = 2.0 V, VOE = 0.8 V
IO = 100 mA, VI = VOE = 0.8 V, VCC = Open
IO = 100 mA
Min. Typ. Max.
Units
µA
µA
V
Output Leakage Current*
ICEX
—
—
40
—
—
—
2.0
—
—
—
—
—
30
<1.0
—
100
100
—
Output Sustaining Voltage
Output Saturation Voltage
VO(SUS)
VO(SAT)
65
200
300
—
mV
mV
mA
V
IO = 300 mA
180
500
—
Over-Current Limit
Input Voltage
IOM
VIH
VIL
IIH
5 ms PulseTest, VO = 5.0 V
INn or ENABLE
—
INn or ENABLE
—
0.8
10
V
Input Current
INn or ENABLE, VIH = 2.0 V
INn or ENABLE, VIL = 0.8 V
VFLT = 60 V
—
µA
µA
µA
µA
IIL
—
-10
15
Fault Output Leakage Current
Fault Output Current
IFLT
4.0
<1.0
VFLT = 5 V
2.0
IFLT
VFLT = 5 V, Driver Output Open,
VI = 0.8 V, VOE = 2.0 V
40
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
60
0.1
1.2
1.5
—
80
0.4
1.7
2.1
50
10
—
µA
V
Fault Output Saturation Voltage
Clamp Diode Forward Voltage
VFLT(SAT)
VF
IFLT = 30 µA
IF = 500 mA
V
IF = 750 mA
V
Clamp Diode Leakage Current
Turn-On Delay
IR
VR = 60 V
µA
µs
µs
µs
µs
µs
mA
mA
mA
mA
mA
°C
tPHL
IO = 300 mA, 50% VI to 50% VO
From Sleep, IO = 300 mA, 50% VI to 50% VO
IO = 300 mA, 50% VOE to 50% VO
IO = 300 mA, 50% VI to 50% VO
IO = 300 mA, 50% VOE to 50% VO
All Outputs Off
0.6
3.0
1.3
2.0
1.4
0.075
12
10
10
10
0.1
20
30
40
50
—
Turn-Off Delay
tPLH
Total Supply Current
ICC
Any One Output On
Two Outputs On
18
Three Outputs On
24
All Outputs On
30
Thermal Limit
TJ
165
Typical Data is at TA = +25°C and VCC = 5 V and is for design information only.
Negative current is defined as coming out of (sourcing) the specified terminal.
As used here, -100 is defined as greater than +10 (absolute magnitude convention) and the minimum is implicitly zero.
* Measurement includes output fault-sensing pull-down current.
www.allegromicro.com
4
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
TYPICAL OPERATING CHARACTERISTICS
600
500
400
300
T
V
A
= +25°C
0.3
0.2
0.1
0
V
CC = 5 V
CC = 5 V
C
°
= 125
TA
C
°
= 25
TA
400
0
100
200
300
40
0
10
20
30
OUTPUT CURRENT IN MILLIAMPERES
OUTPUT VOLTAGE IN VOLTS
Dwg. GP-064
Dwg. GP-065
6
4
IN SWITCHING (FROM SLEEP)
T
V
A
= +25°C
3
CC = 5 V
T
V
A
= +25°C
CC = 5 V
2
IN SWITCHING
ENABLE SWITCHING
ENABLE SWITCHING
2
0
1
IN SWITCHING (AWAKE)
0
400
0
100
200
300
400
0
100
200
300
OUTPUT CURRENT IN MILLIAMPERES
OUTPUT CURRENT IN MILLIAMPERES
Dwg. GP-066
Dwg. GP-066-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
CIRCUIT DESCRIPTION AND APPLICATION
The A2557 low-current quad power drivers provide
protected output driver functions, combined with a fault
diagnostic scheme, plus an automatic low-current Sleep-Mode
function. These devices monitor their outputs for fault (open or
shorted) conditions. For each channel the input and output
levels are compared. If these are different from the expected
levels then a fault condition is flagged by pulling the common
FAULT output low.
•
if the power dissipation in the output device increases the
local junction temperature above 165°C (nominal), so as to limit
the power dissipation (and hence the local junction tempera-
ture). As each channel has its own thermal limit circuitry this
provides some independence between the output channels, i.e.,
one channel can be operating in thermally reduced current limit,
while the others can provide full drive capability.
•
as a function of the output voltage. Full current limit of
500 mA (nominal) is available up to approximately VO = 8 V;
above this the limit is reduced linearly to about 350 mA at VO =
32 V. This helps to improve SOA by immediately reducing the
peak power pulse into a shorted load at high VO.
Status
INN ENABLE OUTN
FAULT
H
L
H
H
L
H
H
H
Normal Load
X
All L
L
X
H
H
H
H
Sleep Mode
A logic low at the ENABLE input causes all outputs to be
switched off regardless of the state of the IN terminals. In
addition, the device is put into a low quiescent current ‘sleep’
mode, reducing ICC below 100 µA. If ENABLE is taken high
and any of the inputs go high, the circuit will ‘auto-wake-up’.
However, if the device is enabled, but all inputs stay low, then
the circuit remains in ‘sleep’ mode.
Over-Current or
Short to Supply
H
H
R
L
Open Load or
Short to Ground
L
H
H
L
L
L
Thermal Fault
H
H
All outputs have internal flyback diodes, with a common-
cathode connection at the K terminal.
R = Linear drive, current limited.
The FAULT output is operational only if ENABLE is high.
The output state is detected by monitoring the OUTn terminal
using a comparator whose threshold is typically 2.5 V. In order
to detect open-circuit outputs, a 30 µA current sink pulls the
output below the comparator threshold. To ensure correct fault
operation, a minimum load of approximately 1 mA is required.
The fault function is disabled when in ‘sleep’ mode, i.e.,
FAULT goes high and the 30 µA output sinks are turned off.
The FAULT output is a switched current sink of typically
60 µA.
Incandescent lamp driver
High incandescent lamp turn-on (in-rush currents) can
contribute to poor lamp reliability and destroy semiconductor
lamp drivers. When an incandescent lamp is initially turned on,
the cold filament is at minimum resistance and would normally
allow a 10x to 12x in-rush current.
Warming (parallel) or current-limiting (series) resistors
protect both driver and lamp but use significant power either
when the lamp is off or when the lamp is on, respectively.
Lamps with steady-state current ratings up to 300 mA can be
driven without the need for warming or current-limiting resis-
tors, if lamp turn-on time is not a concern (10s of ms).
Each channel consists of a TTL/CMOS-compatible logic
input gated with a common ENABLE input. A logic high at the
input will provide drive to turn on the output npn switch. Each
output has a current-limit circuit that limits the output current by
detecting the voltage drop across a low-value internal resistor in
the emitter of the output switch. If this drop reaches a threshold,
then the base drive to the output switch is reduced to maintain
constant current in the output.
With these drivers, during turn-on, the high in-rush current
is sensed by the internal sense resistor, drive current to the
output stage is reduced, and the output operates in a linear mode
with the load current limited to approximately 500 mA. During
lamp warmup, the filament resistance increases to its maximum
value, the output driver goes into saturation and applies maxi-
mum rated voltage to the lamp.
To keep the device within its safe operating area (SOA) this
output current limit is further reduced
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
CIRCUIT DESCRIPTION AND APPLICATION (continued)
Fault diagnostics
NORMAL LAMP IN-RUSH CURRENT
A pull-up resistor or current source is required on the
FAULT output. This can be connected to whatever supply level
the following circuitry requires (within the specification
constraints). For a 5 V supply (i.e., Vcc) 150 kΩ or greater
should be used. As the fault diagnostic function is to indicate
when the output state is different from the input state for any
channel, the FAULT output waveform will obviously produce a
pulse waveform following the combined duty-cycle of all
channels showing a fault condition. There are therefore two
basic approaches to using the function in an application:
NOT TO SCALE
•
As an interrupt in a controller-based system. If the system
THERMAL GRADIENT SENSING
has a microcontroller then a FAULT low causes an interrupt,
which then initiates a diagnostic sequence to find the culprit
channel. This sequence usually consists of cycling through
each channel one at a time, while monitoring the FAULT
output. It is then easy to determine which channel has the
faulty output and how it is failing (i.e., short to supply, open-
circuit or short to ground). The system may then take whatever
action is required, but could continue with operation of the
remaining ‘good’ channels while disabling signals to the faulty
channel.
CURRENT LIMIT
I
TRIP
0
TIME
Dwg. WP-008
Inductive load driver
Bifilar (unipolar) stepper motors (and other inductive
loads) can be driven directly. The internal diodes prevent
damage to the output transistors by suppressing the high-voltage
spikes that occur when turning off an inductive load. For rapid
current decay (fast turn-off speeds), the use of Zener diodes will
raise the flyback voltage and improve performance. However,
the peak voltage must not exceed the specified minimum
sustaining voltage (VSUPPLY + VZ + VF < VO(SUS)).
•
As a simple ‘common’ fault indication. If there is no
controller in the system then the FAULT output can be set to
give an indication (via a lamp or LED, etc.) of a fault condition
which might be anywhere on the four channels. Because the
FAULT output is dependent on the states of the input and
output (four possibilities) but will only indicate on two of them,
the duty cycle at the FAULT output will reflect the duty cycle at
the faulty channel’s input (or its inverse, depending upon fault
type).
Over-current conditions
In the event of a shorted load, or stalled motor, the load
current will attempt to increase. As described above, the drive
current to the affected output stage is linearly reduced, causing
the output to go linear (limiting the load current to about 500
mA). As the junction temperature of the output stage increases,
the thermal-shutdown circuit will shut off the affected output.
If the fault condition is corrected, the output driver will return
to its normal saturated condition.
In typical applications (50% duty cycles) a simple solution
is to make the pull-up current on the FAULT output much less
than the pull-down current (60 µA), and add a capacitor to give
a time constant longer than the period of operation. For typical
values, the device will produce a continuous dc output level.
Component values will need to be adjusted to cope with
different conditions.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
7
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
CIRCUIT DESCRIPTION AND APPLICATION (continued)
IN
NOT TO SCALE
FAULT
(SHORTED
LOAD)
WITH OUTPUT CAPACITOR
FAULT
(OPEN
LOAD)
SHORT CIRCUIT
Dwg. WP-035
NORMAL LOAD
CURRENT LIMIT (12 V SUPPLY)
CURRENT LIMIT (24 V SUPPLY)
Under some conditions it is possible to get spurious
glitches on the FAULT output at load turn-on and turn-off
transitions:
TIME
Dwg. WP-013-1
•
Light load turn-off. Under light loading conditions the
turn-off delay (see characteristics above) of the output stage
increases and may result in a spurious fault output of a few µs
(the duration being proportional to the turn-off delay). As it is
difficult to define this over all operating conditions, if a
particular application would be sensitive to this type of glitch,
then it is generally recommended to include a small (about
0.01 µF) smoothing/storage capacitor at the FAULT output.
Thermal considerations
Device power dissipation can be calculated as:
PD = (VO1 x IO1 x duty cycle1) + … + (VO4 x IO4 x duty cycle4)
+ (VCC x ICC
)
Note - ICC is also modulated by the duty cycle, but this is a
reasonable approximation for most purposes.
•
Incandescent lamp turn-on. As described above, driving an
This can then be compared against the permitted package
power dissipation, using:
incandescent filament results in the driver operating in current
limit for a period after turn-on. During this period a “fault”
condition will be indicated (over current). As discussed above
this period can be 10s of ms. To avoid this indication, the
capacitor on the FAULT output would need to be increased to
provide an appropriate time constant. Alternatively, in a
microcontroller-based system, the code could be written to
ignore the FAULT condition for an appropriate period after
lamp turn on.
Permitted PD = (150 – TA)/RθJA
where RθJA is given as:
28-lead PLCC (part number suffix ‘–EB’) = 36°C/W
16-pin PDIP (part number suffix ‘–B’) =
16-lead SOIC (part number suffix ‘–LB’) = 90°C/W
43°C/W
RθJA is measured on typical two-sided PCB. Additional
information is available on the Allegro web site.
Correct FAULT operation cannot be guaranteed with an
unconnected output — unused outputs should not be turned on,
or unused outputs should be pulled high to >2.5 V, and/or
associated inputs tied low.
www.allegromicro.com
8
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
B Package, 16-pin DIP
with internally fused pins 4, 5, 12, and 13
and external thermal tabs
Preliminary dimensions, for reference only
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
(reference JEDEC MS-001 BB)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
Terminal #1 mark area
A
.775 19.69
.735 18.67
A
.014 0.36
.008 0.20
B
16
.430 10.92
MAX
.280 7.11
.240 6.10
.300 .7.62
A
1
2
.195 4.95
.115 2.92
C
.210 5.33
MAX
SEATING
PLANE
.015 0.38
MIN
.005 0.13
MIN
.100 .2.54
.150 3.81
.115 2.92
.070 1.78
.045 1.14
.022 .056
16X
.014 .036
.010 [0.25] M
C
www.allegromicro.com
9
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
EB Package, 28-pin PLCC
with internally fused pins 5 through 11 and 19 through 25
.495 12.57
.485 12.32
.456 11.58
.450 11.43
2X
.007 [0.18]
H
B A
A
.007 [0.18]
.002 [0.05]
H
B
B A
.456 11.58
.450 11.43
2X
B
.020 0.51
2
1
28
.007 [0.18]
.002 [0.05]
H
B
B
.219 5.56
.191 4.85
A
.219 5.56
.191 4.85
.495 12.57
.485 12.32
.007 [0.18]
H
B
A
.020 0.51
MIN
.120 3.05
.090 2.29
.180 4.57
.165 4.19
.032 0.81
.026 0.66
28X
H
.007 [0.18]
C B A
28X
28X
C
SEATING
PLANE
.004 [0.10]
C
.021 0.53
.013 0.33
.050 1.27
.007 [0.18]
C B A
.219 5.56
.191 4.85
.219 5.56
.191 4.85
Preliminary dimensions, for reference only
(reference JEDEC MS-018 AB)
Dimensions in inches
Millimeters (mm) in brackets, for reference only
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A
Terminal #1 mark area
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
LB Package, 16-pin SOIC
with internally fused pins 4 and 5, and 12 and 13
10.63 .419
9.97 .393
0.25 [.010] M B M
10.50 .614
10.10 .598
8º
0º
A
B
16
0.33 .013
0.20 .008
7.60 .299
7.40 .291
A
1.27 .050
0.40 .016
1
2
0.25 .010
16X
C
SEATING PLANE
GAUGE PLANE
SEATING
PLANE
0.10 [.004]
C
0.51 .020
0.31 .012
16X
2.65 .104
2.35 .093
0.25 [.010] M
C
A
B
1.27 .050
0.30 .012
0.10 .004
Preliminary dimensions, for reference only
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
(reference JEDEC MS-013 AA)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A
Terminal #1 mark area
www.allegromicro.com
11
2557
PROTECTED QUAD DRIVER
WITH FAULT DETECTION
& SLEEP MODE
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
www.allegromicro.com
12
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VISHAY
255D107X0010D2T50
CAPACITOR, TANTALUM, SOLID POLYMER, POLARIZED, 10 V, 100 uF, SURFACE MOUNT, 2916, CHIP
VISHAY
255D107X0010D2T65
CAPACITOR, TANTALUM, SOLID POLYMER, POLARIZED, 10 V, 100 uF, SURFACE MOUNT, 2916, CHIP
VISHAY
255D107X0010D2W
CAPACITOR, TANTALUM, SOLID POLYMER, POLARIZED, 10 V, 100 uF, SURFACE MOUNT, 2917, CHIP
VISHAY
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