Texas Instruments TPS26630-33EVM, User Manual

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General Configurations
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8 SLVUBI8A – October 2018 – Revised March 2019
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TPS26630-33EVM: Evaluation Module for TPS2663x
6. Reduce the CH2 input voltage and verify that the output turns on at 33-V ±1 V.
7. Further reduce the CH2 input voltage and verify that VOUT2 reduces as VN2 reduces and drops to
zero when VIN2 falls below 18-V ±1 V (CH2 UVLO limit).
8. Verify that CH1 and CH2 FLTb red LEDs (D1/D6) turn on whenever the supply voltage reaches either
OVP or UVLO limits of the respective channels.
9. Disable the power supply and the load.
3.4.3 Output Voltage Start-Up Time Test
Follow the instructions to verify the individual channels output voltage start-up time:
1. Set up the oscilloscope as listed in Table 9 .
2. Set the load resistance to 12- Ω ±1 Ω and the power supply voltage to 24 V.
3. Enable the load.
4. Enable the power supply and verify that the output voltage startup waveform is as shown in Figure 2 .
Table 9. TPS26630-33EVM Oscilloscope Setting for the Output Voltage Start-Up Test
Oscilloscope Setting CH1 Probe Points CH2 Probe Points
Channel 1 = 10 V / div VIN_SYS1 (TP3) VIN_SYS2 (TP12)
Channel 2 = 10 V / div VOUT1 (TP4) VOUT2 (TP13)
Channel 3 = 20 V / div PGOOD1 (TP19) PGOOD2 (TP20)
Channel 4 = 1 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 = Rising
Trigger mode = Single
Time base 5 ms / div
Figure 2. Output Voltage Start-Up Waveform