MC33288DHR2 [MOTOROLA]
Solid State Relay for Automotive Flasher Applications; 固态继电器用于汽车电子闪光器的应用
| 型号： | MC33288DHR2 |
| 厂家： | 
MOTOROLA |
| 描述： | Solid State Relay for Automotive Flasher Applications |
| 文件： | 总8页 (文件大小：380K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Freescale Semiconductor, Inc.
Order Number: MC33288/D
Rev. 4.8, 06/2001
MOTOROLA
Semiconductor Technical Data
MC33288
Advance Information
SOLID STATE RELAY FOR
AUTOMOTIVE FLASHER
APPLICATIONS
Solid State Relay for Automotive
Flasher Applications
SEMICONDUCTOR
TECHNICAL DATA
This device is a Dual High Side Power Switch dedicated for automotive flasher
applications. In comparison with mechanical solutions, this device offers higher
reliability as well as protection and diagnostic features.
The device consists of two 25mΩ Rdson fully protected high side switches, in a
surface mount power package. It interfaces directly with a microcontroller and
includes a current recopy function in order to allow the detection of a failed lamp in
the application.
DH SUFFIX
HSOP20 Package
CASE 979-04
PIN ASSIGNMENT
Vbat
21
GND
1
2
3
4
5
6
7
8
9
20
19
18
Wlp
• Designed for Automotive Flasher Applications
• Junction Temperature Range from - 40°C to 150°C
• Operating Voltage Range from 8V to 35V
• Maximum Breakdown Voltage greater than 40V
• Protected in case of loss of ground
• Surface Mount Power Package
• 25mΩ Rdson per Channel at 25°C
• 8Amps Nominal Current per Channel
• 1.2W Warning Lamp Driver
Cur R
Status
IN-2
IN-1
NC
17 NC
16
DNC*
Out-2
Out-2
Out-2
NC
DNC*
Out-1
Out-1
Out-1
NC
Heat sink
5
1
14
3
1
• Overtemperature Protection with Hysteresis
• Open Load Detection in On-State
• Short-Circuit Protection
12
11
NC
NC 10
21
Vbat
• Overload Current Protection
* Do Not Connect
• Current Recopy to Monitor Lamp Output Current
• Under Voltage Shutdown
• ESD Protection 2kV
ORDERING INFORMATION
Operating
Device
Package
• Standby Current less than 10µA at V less than 14V
Temperature Range
TA=-40° to +125°C
TA=-40° to +125°C
bat
MC33288DH
HSOP20
HSOP20
MC33288DHR2
Simplified Application Schematic
5V
5V
+
-
VBAT
10k
Trailor
OUT-1
IN-1
Buzzer
I/O
I/O
I/O
21W
5W
5W
21W 21W
IN-2
ST
MC33288
Static Flasher
MCU
Turn
switch
Car left side lamps
Cur R
A/D
OUT-2
Warning
switch
5W
21W
Gnd
Wlp
1.2W
21W
5W
21W
dashboard
direction indicator
dashboard
trailer indicator
Car right side lamps
This document contains information on a new product. Specifications and
information herein are subject to change without notice.
TM
© Motorola, Inc., 2001. All rights reserved.
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Freescale Semiconductor, Inc.
MC33288
PINS FUNCTION DESCRIPTION
Pin No.
Name/Function
bat
Description
TAB
V
The backside TAB is connected to the power supply of the
MC33288DH. In addition to its supply function, this pin contributes to
the thermal behaviour of the device by conducting the heat from the
switching MOSFET to the printed circuit board.
Supply Voltage
6,7,8
OUT1
OUTPUT Channel 1
OUT 2
Pins 6,7,8 are the source of the output1 25mOhm MOSFET1. Pins
13,14,15 are source of the output 2 25mOhm MOSFET2. They deliver
current to the connected loads and are respectively controlled via the
IN1 and IN2 pins. These outputs are current limited and thermally
protected.
13,14,15
OUTPUT Channel 2
3
IN 1
These are the device input pins which directly control their associated
outputs. The levels are CMOS compatible. When the input is a logic
low, the associated output MOSFET is in the off state. When input is
high, the MOSFET is turned on and the load is activated.
INPUT Channel 1
IN 2
INPUT Channel 2
18
When both inputs are low, the device is in standby mode and its
supply current is reduced. Each input pin has an internal active pull
down, so that it will not float if disconnected.
19
Status
Status for both
Channels
The Fault output is an open drain indication that goes active low when
a fault mode (Openload, Overtemp) is detected by the device on
either one channel or both simultaneously. Its internal structure is an
open drain architecture with an internal clamp at 6V. An external pull
up resistor connected to Vdd (5V) is needed. See Functional Truth
Table.
20
2
Wlp
This pin is the source of a 3.2 Ohm MOSFET. This output is current
limited and thermally protected. It delivers current through the
connected load when both IN1 and IN2 inputs are logic high. It is usually
used as a warning lamp driver for Flasher application.
Warning Lamp Output
Cur R
Load Current Sense
The Current Sense pin deliver a ratioed amount (1/1000) of the sum
of the currents that can be used to generate signal ground referenced
output voltages for use by the microcontroller.
4, 9, 10, 11, 12, 17
NC
These pins are not used.
Not Connected
5, 16
11
DNC
Do Not Connect
These pins must not be connected.
This is the Ground pin of the device.
GND
GROUND
Solid State Relay for Automotive Flasher Applications
2
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MC33288
Block Diagram and Application Schematic
Battery
V
bat
Cb
Out-2
Out-2
Out-2
Charge
Pump
21+5W
5V
CHANNEL 2
Left
Out-1
Out-1
Out-1
21+21+5W
Left side
Trailor Left side
Over
Temp
Over
Current
10K
Input
Trigger
V
batc
IN-2
R
I/O
St-2 Cr 2
Open
Load
MCU
R
R
IN-1
ST
I/O
I/O
Current
Recopy
Fault
Monitoring
St-1
CHANNEL 1
Right
Cr 1
21+21+5W
Right side
R
A/D
Cur R
Rcr
Vbat
IN-2
Current copy
resistor
Drive &
protect
Warning Lamp
Driver
MC33288
21+5W
Trailor Right side
Wlp
Vbat
R : 10k typical
Rcr : 500Ω to 1kΩ typical
Cb : 100nF to 470nF
Rwlp : 100Ω typical
Rwlp
1.2W
GND
FUNCTIONAL TRUTH TABLE
In-1
In-2
Out-1
Out-2
St
Normal Operation
L
H
L
L
L
H
H
L
H
L
L
L
H
H
H
H
H
H
H
H
Openload Channel 1
Openload Channel 2
H
X
X
H
H
X
X
H
L
L
Overtemp Channel 1
Overtemp Channel 2
H
L
X
X
H
X
X
H
L
L
L
X
X
L
X
X
L
L
L
L
H
L
H
L
Overtemp Channel 1 and Channel 2
H
Overcurrent or Current limit Channel 1 (note)
Overcurrent or Current Limit Channel 2 (note)
H
X
X
H
H
X
X
H
H
H
L = ‘Low level’ H = ‘High level’X = ‘don’t care’
NOTES :
In case of over current or short-circuit, the device will not report the fault to the status pins. The output current will be limited to the Ilim value. The device will probably
heat up and in this case the overtemperature detection will be triggered. If so, the output will be turned off and the fault will be reported to the status pins.
Solid State Relay for Automotive Flasher Applications
3
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MC33288
MAXIMUM RATINGS
ELECTRICAL RATINGS
Ratings
Symbol
Value
Unit
Vbat Voltage with Respect to Gnd : Continuous/Pulse
Out-1 & Out-2 Voltage with Respect of Gnd : Continuous/Pulse
Out-1 to Vbat & Out-2 to Vbat voltage : Continuous/Pulse
IN-1, IN-2, St DC Voltage : Continuous/Pulse
Vbat
-14 to + 40
-0.3 to 40
40
V
V
V
V
V
Vout
Vout
Vin
-0.3 to 7
-0.3 to 7
Cur R Voltage : Continuous/Pulse
Vcr
ESD all Pins
Human Body Model (note1)
Machine Model (note2)
V
V
+/-2000
+/-200
V
V
esd1
esd2
Out-1, Out-2 Output Current : Pulse (note 3)
IN-1, IN-2, St
Ioutp
Iin
40
Amp
mA
+/-5
THERMAL RATINGS
Junction Temperature
Tj
- 40 to 150
°C
Storage Temperature Range
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient (note 4)
Tst
- 65 to +150
°C
Rthjc
Rthja
Pd
2
°C/W
°C/W
W
25
5
Power Dissipation at Tcase 140°C (note 5)
NOTES :
1. EDS1 testing is performed in accordance with the Human Body Model (Czap = 100pF, Rzap = 1500Ω)
2. EDS2 testing is performed in accordance with the Machine Model (Czap = 100pF, Rzap = 0Ω)
3. During lamp inrush current.
2
2
2
4. Device mounted on dual side printed circuit board with 70µm copper thickness and 10cm copper heat sink (2.5 cm on top side and 7.5 cm on down side).
5. Assuming a 150°C maximum junction temperature.
ELECTRICAL CHARACTERISTICS (Vbat from 9 to 16V and junction temperature Tj from -40° to 150°C, unless otherwise noted)
Characteristics
Description
Symbol
Unit
Conditions
min.
typ.
max.
Nominal Operating Voltage
Functional Operating Voltage
Under Voltage Threshold
Vbat Standby Supply Current
Supply Current in On State
V
9
8
6
16
35
8
V
V
bat
V
bat
V
7
1
8
V
uv
I
I
10
20
µA
mA
V
<14V & V = 0V,T <125°C
in
stdby
on
bat
j
IN-1 & IN-2 @3.5V, no fault,
Vbat<14V,T <125°C
j
Drain to Source on Resistance
Drain to Source on Resistance
High Current Limitation
R
R
I
20
30
30
4
25
40
mΩ
mΩ
A
Iout =4A, V
> 9V & T = 25°C
bat j
dson
dson
Iout = 4A, V
Vout > 1V
> 9 & T = 150°C
j
bat
lim
Short Circuit limitation
I
I
A
Vout < 1V, Tj=25°C
lim
ol
Hot Openload Threshold
1
A
Vbat to Output Breakdown Voltage
V
40
V
In-1 and In-2 @ 0V, Vout = 0,
Iout -0.25mA
dss
Vbat to Out-1 : Leakage Current
I
10
µA
Vin-1 =0V, Vbat =35V, Vout-1=0V
out-leak
Solid State Relay for Automotive Flasher Applications
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MC33288
Characteristics
Description
Symbol
Unit
Conditions
min.
typ.
max.
Vbat to Out-2 : Leakage Current
Vin-1, Vin-2 : Input Voltage Low Threshold
Vin-1, Vin-2 : Input Voltage High Threshold
Vin-1, Vin-2 : Input Voltage Hysteresis
Vin-1, Vin-2 : Input Current
I
10
µA
V
Vin-2 =0V, Vbat =35V, Vout-2=0V
out-leak
V
1.5
il
V
3.5
0.4
V
ih
ih
V
0.7
18
0.9
40
V
I
µA
V
Vin-1, Vin-2 = 3.5V
in
Status Output Voltage
Vst
0.5
Ist = 1mA; Output in Fault
Thermal Shutdown
T
150
-10
°C
°C
shut
Thermal Shutdown Hysteresis
Current Recopy Ratio
T
10
hyst
Cr
1/1000
Vout>Vbat -1V, Iout from 2A to 4A
Tj -40°C to 105°C, Vbat 9 to 16V
Current Recopy Ratio Accuracy
Cr-ac
10
%
Vout >Vbat -1V, Iout from 2A to 4A
Tj -40°C to 105°C, Vbat 9 to 16V
Extended Current Recopy Ratio
Extended Current Recopy Ratio Accuracy
Current Recopy Clamp Voltage At 10mA
Nominal Flasher Frequency Operation
Frequency Operation
Crex
Crex-ac
Vclst
Ffl
1/1000
Vout >Vbat -1V, Iout from 1A to 8A
Vout >Vbat -1V, Iout from 1A to 8A
-20
5.5
20
7
%
V
1.5
50
Hz
Hz
%
Fop
100
Nominal Flasher Duty Cycle Operation
Wlp output Drain to Source on Resistance
Wlp output Drain to Source on Resistance
Wlp output Current Limitation
DCfl
RW
RW
IW
3.2
5
Ω
Iout =100mA, V
Iout =100mA, V
Vout =0V
> 9V & T = 25°C
j
on
on
bat
bat
Ω
> 9V & T = 125°C
j
500
mA
°C
V/µs
V/µs
µs
lim
Wlp Thermal Shutdown
TW
Tr
150
0.01
0.01
1
shut
Maximum Output Positive Slew Rate
Maximum Output Negative Slew Rate
Turn On delay time
0.3
0.3
30
2
load = 6 Ω
load = 6 Ω
Tf
2
Tdon
Tdoff
200
200
load = 6 Ω, from Vin/2 to 10% Vout
load = 6 Ω, from Vin/2 to 90% Vout
Turn Off delay time
1
40
µs
Solid State Relay for Automotive Flasher Applications
5
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MC33288
DEVICE DESCRIPTION
Introduction
The MC33288DH is a dual high side switch with
device incorporates a current limitation at 30 Amps typical.
This mean that the really first inrush current will be clamped at
30 Amps. The second lamp turn on of the flashing cycle will
not see any clamping as the lamps have been heated up in the
previous cycle.
In-1 and In-2 are the two inputs of the device, connected to
a microcontroller I/O ; they are CMOS compatible. When
these inputs are in low state, the device is in standby mode.
When any of the inputs are switched to a high level, the
associated output MOSFET is turned on.
appropriate control, protection, and diagnostic features
dedicated to automotive flasher applications. The device
consists of two independent 25mΩ power switches and an
additionnal 3.2 Ohm high side switch capable of controlling a
1.2W warning lamp. It interfaces directly with a microcontroller
and the package used is a HSOP20 power small outline, 20
pins. The MC33288 incorporates a status pin and a load
current sense capability.
Power Supply
Status
The MC33288 can be directly connected to the supply
line. In standby mode (In-1 & In-2 @ OV), the supply current is
less than 10µA for Vbat supply voltage below 14V. This
feature allows a very low supply current on the battery when
the car is idle or parked.
During off state, the current recopy pin and the status pins
are in high impedance.
In case of loss of (digital) ground, the power MOSFETs
turn off in order to safely tie the load current to zero.
The device has a single status pins which reports an over
temperature and an openload condition in the device. This pin
is an open drain structure and needs an external pull up
resistor. The device incorporates overtemperature sense on
each output MOSFET in order to independently protect each
output. But , the report of the overtemperature is done through
one single status pin called Status, in order to minimise the
number of I/O connection of the MCU.
Open Load Function
Nominal Voltage and Transient Operation
The open load detection is active during the ON phase (Hot
The nominal operation voltage is from 9 to 16V. The
MC33288 is functional over a larger voltage range from 8V to
35V. The technology used for both power and analog circuitry
sustains 40V DC voltage.
open load detection). An amplifier measures the differential volt-
age between V and V
.
bat
out
When the load current is below 1A, the open load circuitry will
pull down the status output. If the open load condition is present
before the device turn-on, the status will be pulled down after a
delay due to the rise time of the output.
Reverse Battery
The MC33288 is self protected against reverse battery up
to -14 Volts in a continuous mode. When a negative battery
voltage arises, the MOSFETS are internally turned off. The
load current flows in the body diode of each MOSFET. The
power dissipation within the MC33288DH is then Vf x Iload,
where Iload is the total current set by the loads and Vf is the
forward body diode voltage. Vf is 0.5V typical at 150°C and
decreases with temperature with a drop of -2mV/°C.
Current Recopy Function
Flasher application needs to detect failed lamp. The
system must detect one 21W lamp failing, in the flasher
application only, without a trailor. The MC33288 has an output
current recopy function which recopies on the Cur R pin a
portion of the output current. Each channel is connected to the
same Cur R pin as the system have to operate in the flasher
mode only and not in the warning operation.
Power Output Switches
The MC33288 provides a current recopy of 1/1000 of the
main output current, either output left or right. The recopy
function has its higher accuracy of +-10% in the usual
operation range and an accuracy of +-20% in the total
operating range. This allows a precise detection of one 21W
lamp, but also the detection of additional lamps in case of
trailor connection.
The device has two independent high side switches. Each
switch is realised with an N-channel power MOSFET and
includes current and temperature sensing circuitries. The
MOSFET gates are driven by analog circuitry which includes
charge pump and fault detection. A specific feature of this
device is the output current recopy.
Each output has a 25mΩ Rdson max at 25°C. The Rdson
value reaches 40mΩ at 150°C junction temperature. Each
output has a parasitic drain to source diode, inherent to the
technology. This diode can sustain as much current as the
MOSFET. This diode is reversed biased during normal
operation of the MOSFET and is forward biased during
reverse battery or negative transient pulses.
The output MOSFET can each drive 8 Amps nominal. This
maximum current condition occurs when up to three 21W
lamps and two small 5 or 7W lamps are connected on each
channel, at higher Vbat voltage specification. This is the case
when a trailor is attached to the car. As the flasher can operate
in warning or hazard operation mode with its two channels on,
the MC33288 can drive 16 Amps total.
When lamps are turned on, the inrush current can reach
up to 6 times the nominal lamp current. For this particular
application, the total inrush current can reach 6 time 8 Amps,
that is up to 48Amps per channel. The 48Amps value will only
occur at the first lamp turn on. In order to optimise the total
system,(MC33288, printed circuit board, wiring, fuse etc.) the
An external resistor must be connected to the Cur R pin
and then tied to a microcontroller A/D input for analog voltage
measurement. The Cur R pin is internally clamped to protect
the MCU A/D input.
Warning Lamp Driver
The warning lamp driver is a 3.2 Ohms Rdson max High
Side MOSFET to control the 1.2W dashboard warning lamp.
This output is current limited and thermally protectedactivated
only in the warning mode. It is turned on by activation of both
right and left inputs (IN1 and IN2)
Package
The device is assembled into a power surface mount
package. This package offers high thermal performances and
high current capabilities. It offers 10 pins on each package
sides and an additional pin which is the package heat sink ,
called pin 21. The heak sink acts as the MC33288 power Vbat
connection.
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MC33288
Soldering Information
Figure 2. Simplified Thermal Model (Electrical Equivalent)
This device is packaged in a Surface Mount Power
package indended to be soldered directly on the Printed
Circuit Board.
Chan 1 Junction
Temp Node
(Volts represent Die
Temp Node
Chan 2 Junction
Surface Temperature)
This device was qualified according to JEDEC standards
JESD22-A113-B and J-STD-020A with the reflow conditions
applicable for packages with thickness above 2.5mm :
Convection 220°C +5/-0°C
Chan 1
Switch
Chan 2
Switch
VPR 215-219°C
IR / Convection 220°C +5/-0°C
The maximum peak temperature during the soldering process
should not exceed 220°C (+5°C/-0°C). The time at maximum
temperature should range from 10 to 40s max.
Rthjc1
Rthjc2
2°C/W
2°C/W
Chan 2
Power (W)
Chan 1
Power (W)
Case Temp Node
(1.0A=1W of
Power Dissipation)
Rthca
(1.0Ω=1°C/W)
25°C/W
Thermal Management
Ambient Temp Node
AmbientTemperature
The junction to case thermal resistance is 2°C/W
maximum. The junction to ambient thermal resistance is
dependent on the mounting technology and the addition of
heat sink. One of the most commonly used mounting
technique consists in using the printed circuit board and the
copper lines as heat sink.
(1.0V=1°C)
Transient Thermal Model
Figure 1. Printed Board Layout Example (not to scale)
A more complete model including thermal capacitance is
proposed in figure 3.
Top side pcb
Down side pcb
2
2
2 cm
8 cm
Figure 3. Transient thermal model
1mJ/K
4mJ/K
3.5K/W
5mJ/K
3K/W
5mJ/K
MOS1
HSOP20
MOS3
MOS2
Control
3.5K/W
3K/W
3K/W
Case
Thermal
via from
top to down
side pcb
450K/W
3K/W
Board
external pcb (4x4 cm)
0.5J/K
300K/W
20K/W
6J/K
Ambiant
Figure 1 shows an example of printed circuit board layout.
2
2
It has a total of 10cm additional copper on two sides (2.5 cm
2
on the top side and 7.5 cm on the down side).
This gives a thermal impedance versus time (figure 4), which
has been determined with the printed circuit board shown in
figure 1.
With the above layout, thermal resistance junction to ambient
of 25°C/W can be achieved, this value being splitted into :
• junction to case : Rthjc1 = Rthjc2 = 2°C/W
Figure 4. Junction to ambiant Thermal impedance
30
• case to ambient : Rthca = 23 °C/W.
Lower value can be reached with the help of larger and
thicker copper metal, higher number of thermal via from top to
down side pcb and the use of additional thermal via from the
circuit board to the module case.
20
Steady State Thermal Model
The junction to ambient thermal resistance of the circuit
mounted on a printed circuit board can be splitted into two
main parts : junction to case and case to ambient resistances.
A simplified steady state model is shown in figure 2.
10
0
0
100
200
300
400
500
600
700
800
Time (sec.)
This figure shows that the steady state is reached after about
10 minutes. It also clearly shows that the device can dissipate
almost twice the power within one minute compared to the
maximum allowed power dissipation in steady state.
Solid State Relay for Automotive Flasher Applications
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MC33288/D
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相关型号：
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