Texas Instruments TPS2640EVM, User Manual

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4.4.5 Reverse Polarity Test
Follow the instructions to verify the reverse polarity protection feature of the device:
1. Set up the oscilloscope as listed in Table 4-11 .
Table 4-11. TPS2640EVM Reverse Polarity Test
Oscilloscope Setting CH1 Probe Points CH2 Probe Points
Channel 1 = 10 V / div VOUT1 (TP3) VOUT2 (TP12)
Channel 2 = 10 V / div VIN1 (TP2) VIN2 (TP11)
Trigger source = Channel 1
Trigger level = –12 V ±1 V
Trigger polarity = Falling
Trigger mode = Single
Time base 10 ms / div
2. Set the power supply voltage to 42 V and disable the power supply.
3. Cve terminal of the power supply to either T1/T3 –ve terminal, connect –ve terminal of the power
supply to either T1/T3 +ve terminal.
4. Enable the power supply and verify the reverse polarity protection waveform as shown in Figure 4-8 .
Figure 4-8. Reverse Polarity Protection
General Configurations www.ti.com
14 TPS2640EVM: Evaluation Module for TPS2640 SLVUBX9 – OCTOBER 2020
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