Texas Instruments LM76202-Q1, User Manual

Page: 10 / 21

Test Procedure and Results
www.ti.com
10 SLVUBM3B – January 2019 – Revised December 2019
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
LM76202-Q1 Evaluation Module
Figure 7. LM76202-Q1EVM Wake-up Into Short (VIN = 12.5 V, ILIM = 2.23 A, MODE = RTN)
6.6 Negative Input Voltage Transient Test (ISO 7637-2 Pulse 1)
Use the following instructions to perform negative input voltage transient test
• Select the ISO 7637-2 Pulse 1 in UCS 200N simulator.
• Set the parameters for pulse as:
– Battery voltage = 12 V
– U
s
= –150 V
– R
i
= 10 Ω
– t
r
= 1 µs
– t
1
= 0.5 s
– t
2
= 200 ms
• Connect the output of UCS 200N to input connector T1 of the EVM.
• Connect a load of 12
Ω
on the output connector T2 of the EVM.
• Enable the output of UCS 200N and start the test.
• Observe the waveforms of VIN, VOUT and IOUT using an oscilloscope.
Figure 8 shows the protection of load during a negative input voltage transient of –150 V (with
specifications as per ISO 7637-2 pulse 1). The TVS diode D2 clamps the input voltage to –40 V during the
transient event.