Texas Instruments TPS25944X635EVM, User Manual

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General Configurations
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Figure 4. Vout Ramp-up Time of Latched Circuit Breaker (CH2)
4.4.1.4 Circuit Breaker Current Limit Test
1. Verify all three current limits (CH1 and CH2, with only 1 channel powered at a time) and verify the
Latch and auto-retry feature. Setup the oscilloscope as shown in Table 8 .
Table 8. PWR635 Oscilloscope Setting for Current Limit Test
(1)
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 4 = 5 A/div Input current into J3 +Ve wire Input current into J8 +Ve wire
Trigger source = Channel 4
Trigger level = 1.0 ±0.2 A
Trigger polarity = +Ve
Trigger Mode = Single Sequence
Time base 40 ms/div
(1)
If an electronic load is used, ensure that the output load is set to constant resistance mode and not constant current mode.
2. The jumper setting for the different current limit test is shown in Table 9 .
Table 9. PWR635 Jumper Setting for Current Limits
Jumper Position
Load Current Limit
J4 (CH1) J9 (CH2)
HI HI 5.3 A
LO LO 3.6 A
No Jumper No Jumper 2.1 A
10 TPS25944X635EVM: Evaluation Module for TPS25944X SLUUBC2A – May 2015 – Revised July 2015
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