Texas Instruments TPS2640EVM, User Manual

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4.4.4 Output Short-Circuit Protection Test
Follow the instructions to verify the output short-circuit protection feature of the device:
1. Set up the oscilloscope as listed in Table 4-10 .
Table 4-10. TPS2640EVM Output Short-Circuit Protection 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)
Channel 3 = 20 V / div FLTb1 (TP1) FLTb2 (TP10)
Channel 4 = 2 A / div Input current into T1 +Ve wire Input current into T3 +Ve wire
Trigger source = Channel 1
Trigger level = 12 V ±1 V
Trigger polarity = Falling
Trigger mode = Single
Time base 2 ms / div
2. Set the load resistance to 16 Ω ±1 Ω and the power supply voltage to 24 V.
3. Enable the load and the power supply.
4. Use either wire or FET to short the output to ground and verify the output short-circuit response waveform as
shown in Figure 4-7 .
Figure 4-7. Output Short-Circuit Protection
www.ti.com General Configurations
SLVUBX9 – OCTOBER 2020
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TPS2640EVM: Evaluation Module for TPS2640 13
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