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Texas Instruments DRV3205-Q1 Applications in 24-V Automotive Systems Application notes
Application Report
SLVA777 – August 2016
DRV3205-Q1 Applications in 24-V Automotive Systems
ABSTRACT
This application report describes operation of the DRV3205-Q1 device with various high voltage supply
profiles expected in an automotive 24-V battery system.
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Contents
Introduction ...................................................................................................................
Test Procedure ...............................................................................................................
Hardware and Test Conditions .............................................................................................
PCB Layout Guideline .......................................................................................................
Test 1 Condition..............................................................................................................
Summary ......................................................................................................................
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3
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4
List of Figures
1
Test Schematic............................................................................................................... 2
2
Supply Profile 1 Timing Chart .............................................................................................. 3
3
Supply Profile 2 Timing Chart .............................................................................................. 4
List of Tables
1
Supply Profile 1 Test Conditions........................................................................................... 3
2
Supply Profile 1 Test Result ................................................................................................ 3
3
Supply Profile 2 Test Conditions........................................................................................... 4
4
Supply Profile 2 Test Result ................................................................................................ 4
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DRV3205-Q1 Applications in 24-V Automotive Systems
Copyright © 2016, Texas Instruments Incorporated
1
Introduction
1
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Introduction
The designers of automotive electronics face many technical challenges during the system design
process. The challenges include designing protection circuits against a variety of electrical hazards. This
application report focuses on protection against transient surges which are one of the sources of electrical
hazards in these systems. The DRV3205-Q1 device is designed to withstand a 60-V absolute-maximum
battery voltage and 70-V on gate and source motor pins (GHSx,SHSx) which adds a margin of robustness
against such hazard.
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Test Procedure
Use the following steps for the test procedure:
Step 1. Run DRV3205-Q1 test sample through automatic test to record test result and data log.
Step 2. Run the supply profile bench test.
Step 3. Repeat step 1 and compare the test results.
Battery voltage
PMIC
IRFS3006PBF
IHSx(1)
ILSx(1)
BLDC
Motor
MCU
DRV3205
ERR
Ox(1)
(1)
X = 1, 2 , or 3
Figure 1. Test Schematic
3
Hardware and Test Conditions
The hardware and test conditions include the following:
• PWM frequency: 16 KHz
• FET part number: IRFS3006PBF
• Switching pattern: All 6 FETs switch per the PWM cycles
2
DRV3205-Q1 Applications in 24-V Automotive Systems
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SLVA777 – August 2016
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PCB Layout Guideline
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4
PCB Layout Guideline
For additional layout guidelines, refer to DRV3205-Q1 Three-Phase Automotive Gate Driver With Three
Integrated Current Shunt Amplifiers and Enhanced Protection, Diagnostics, and Monitoring (SLVSDJ4).
5
Test 1 Condition
5.1
Supply Profile 1
Supply provide 1 is a typical automotive 24-V battery surge profile.
Vmax
Vmin
tr
t1
tf
Figure 2. Supply Profile 1 Timing Chart
Table 1. Supply Profile 1 Test Conditions
CONDITIONS
LIMITS
VMAX
33 V
VMIN
28.3 V
tr
< 10 ms
tf
< 10 ms
t1
60 min.
ttest
100 C
Number of cycles
1
Table 2. Supply Profile 1 Test Result
CRITERIA
RESULT
COMMENT
DUTs Tested
6 Units
Sample size for this test
ERR pin asserted
No
No fault was detected by DRV3205.
Status flag latched unexpectedly
No
No fault was detected by DRV3205.
Unintentional Gate Driver shutdown
No
No fault was detected by DRV3205.
Current Consumption of Device
Normal
No damaged to DRV3205
Thermal Shut Down Occurred
No
DRV3205 junction temperature remained
lower than thermal shutdown threshold
Post ATE test
Pass
No damaged to DRV3205
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3
Test 1 Condition
5.2
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Supply Profile 2
Supply provide 2 is a typical automotive 24-V battery surge profile.
Vmax
Vmin
tr
t1
tf
Figure 3. Supply Profile 2 Timing Chart
Table 3. Supply Profile 2 Test Conditions
CONDITIONS
LIMITS
VMAX
42 V
V MIN
25.3 V
tr
10 ms
tf
10 ms
t1
60 s
ttest
RT
Number of cycles
1
Table 4. Supply Profile 2 Test Result
6
CRITERIA
RESULT
COMMENT
DUTs tested
6 Units
ERR pin inserted
No
Sample size for this test
No fault was detected by DRV3205.
Status flag latched
unexpectedly
No
No fault was detected by DRV3205.
Unintentional gate-driver
shutdown
No
No fault was detected by DRV3205.
Post ATE test
Pass
No damaged to DRV3205
Current consumption of device
Normal
No damaged to DRV3205
Thermal shutdown occurred?
No
DRV3205 junction temperature remained
lower than thermal shutdown threshold
Summary
The high-voltage operation capability of the DRV3205-Q1 device was demonstrated in this document. The
DRV3205-Q1 device can operate without interruption using a typical, automotive 24-V battery under highvoltage profile (profile 1 and 2) test. The support of an extended absolute-maximum voltage on VS, VSH,
GHSx, and SHSx pins enables this performance. Notably no damage or parametric degradation was
observed.
4
DRV3205-Q1 Applications in 24-V Automotive Systems
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SLVA777 – August 2016
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