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Test Setup and Procedures
5.4 Power Up into Short
Use the following instructions to perform the power up into short test:
1. Set the input supply voltage VIN to 12 V and current limit to 100 A. Keep the power supply OFF.
2. Short the output of the EVM. For example, VOUT (Connector T2) to PGND (Connector T3) through a short
and thick cable to make sure the short-circuited path impedance is minimum as possible.
3. The reference voltage for overcurrent protection and active current sharing is at 1 V by default.
4. Configure the jumpers J4 and J5 positions to the desired current limits during start-up as mentioned in
4-3.
5. Keep the eFuses disabled by pushing the switch SW1.
6. Turn ON the power supply.
7. Enable the eFuses by releasing the switch SW1.
Figure 5-6
shows the test waveforms of power up into output short on the TPS25990EVM with one TPS25990
eFuse and one TPS25985 eFuse in parallel.
start-up into short.
During power-up into short, a thermal fold-back results in the current flowing through the device being
less than the calculated value of the current limit during start-up.
VIN
VOUT
EN
Output Current
Figure 5-6. Power Up into Output Short Response
in TPS25990EVM (V
IN
0 V to 3 V, R
ILIM(TPS25990)
499 Ω, V
= 1 V, and OUT Shorted to PGND)
IREF
16
TPS25990 Evaluation Module for eFuse
Figure 5-7
= 12 V, EN Stepped Up from
= 665 Ω, R
ILIM(TPS25985)
Copyright © 2023 Texas Instruments Incorporated
presents the current sharing between two eFuses during
Note
VIN
VOUT
VILIM_TPS25990
VILIM_TPS25985
IIN_TPS25990
IIN_TPS25985
IIN_TPS25990 + IIN_TPS25985
Figure 5-7. Power Up into Output Short Response
in TPS25990EVM: Current Sharing between
=
TPS25990 and TPS25985 eFuses (V
Stepped Up from 0 V to 3 V, R
Ω, R
= 499 Ω, V
LIMI(TPS25985)
Shorted to PGND)
SLVUCH7A – SEPTEMBER 2022 – REVISED JUNE 2023
www.ti.com
Table
= 12 V, EN
IN
= 665
ILIM(TPS25990)
= 1 V, and OUT
IREF
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