Texas Instruments TPS25944X635EVM, User Manual

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General Configurations
fully turned off when VIN2 (TP15) reaches 2.1 V (+0.3 V). Verify that the PG2 green LED (D7) turns off
and the FLTb2 red LED (D6) turns ON.
3. Increase the input voltage on VIN2 and monitor VOUT2. Verify that VOUT2 (TP16) starts increasing
and is fully turned off when VIN2 (TP15) reaches 15.5 V (±1 V). Verify that the PG2 green LED (D7)
turns off and the FLTb2 red LED (D6) turns ON.
4. Turn off the power supply.
4.4.1.3 Ramp-Up Time Test (CH1 and CH2)
1. Verify ramp-up time (CH1 and CH2, with only 1 channel powered at a time). Set up the oscilloscope as
shown in Table 7 .
Table 7. PWR635 Oscilloscope Setting for Ramp-Up Voltage Test
Oscilloscope Setting CH1 Probe Points CH2 Probe Points
Channel 1 = 5 V/div TP2 = VOUT1 TP16 = VOUT2
Channel 2 = 5 V/div TP3 = VIN1 TP15 = VIN2
Channel 3 = 5 V/div TP8 = EN/UVLO1 TP17 = EN/UVLO2
Channel 4 = 2 A/div Current probe in input +Ve wire Current probe in input +Ve wire
Trigger source = Channel 1
Trigger level = 6.0 ±0.5 V
Trigger polarity = Positive
Trigger Mode = Single Sequence
Time base = 1 ms/div
2. Set the output load at 5 Ω on CH1 and then enable the load. Turn on the power supply, Press the EVM
RST switch (S1) and release, verify that VOUT1 (TP2) ramps up as shown in Figure 3 .
Figure 3. Vout Ramp-Up Time of Auto-Retry Circuit Breaker (CH1)
3. Set the output load at 5 Ω on CH2 and then enable the load. Turn on the power supply, Press the EVM
RST switch (S2) and release, verify that VOUT2 (TP16) ramps up as shown in Figure 4 .
9 SLUUBC2A – May 2015 – Revised July 2015 TPS25944X635EVM: Evaluation Module for TPS25944X
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