General Configurations
11
SLVUBI8A – October 2018 – Revised March 2019
Copyright © 2018–2019, Texas Instruments Incorporated
TPS26630-33EVM: Evaluation Module for TPS2663x
3.4.6
Surge Test (IEC61000-4-5 Level 1)
1. Set the load resistance to 6-
Ω
±0.5
Ω
(Rload) and connect the load resistance to Terminal T2 of the
EVM.
2. To support Class-A operation with 4-A load current (Rload = 6
Ω
) during surge, output capacitor (C3) of
2mF is required. If load current < 2.5 A (Rload > 10
Ω
), 1mF output capacitor is sufficient for
supporting Class-A operation.
3. Set the current limit to 4.5 A or 6 A by changing jumpers J4 (for CH1) .
4. Using the UCS 500N or similar simulator apply the surge pulse (IEC 61000-4-5 Level 1) to input
terminal TI of the EVM. Use a 24-V DC supply for power line inputs (L-N) of the simulator.
5. Observe the waveforms for VIN1, VOUT1, IIN1 and PGOOD1 on the EVM.
and
provide the waveforms for uninterrupted operation of device during surge pulses.
V
OUT
remains above 17.3 V with PGOOD remaining high.
Figure 4. +500-V Surge Protection [C
OUT
= 2 mF, R
LOAD
= 6
Ω
, VIN = 24 V, I
LIM
= 4.5 A, Peak Pulse Power =
12 kW]
