TPS2492: Please help me check the TPS2492 circuit.

YM Yeh

Part Number: TPS2492

Tool/software:

1. Please help me check the circuit. The NMOS is not working with a 48V input power supply.

2. I also searched the forum for Vuven_h and found that it requires a 1.35V input. This is different from the datasheet.

0 Avishek Pal 1 month ago

Please make P48R7 to 10Ω.

Please check the UVLO and OVLO thresholds.

Please check the following signals during startup.

VIN, VOUT, TIMER, GATE

YM Yeh said:
I also searched the forum for Vuven_h and found that it requires a 1.35V input. This is different from the datasheet.

1.25V is VUVEN_L. Hysteresis is 100mv.

0 YM Yeh 1 month ago

hi Sir

Questions about power trigger protection

Ilim= 50mV/ 3mohm= 16.67A

Vprog=4* (R4=10K/ (10K+R5=1.35K)= 0.475V

Plim= 0.475* 10*16.67= 79.18W

I use a load device to draw 2A, but the power protection does not trigger. How can I solve this problem?

48*2=96W> 79.18

0 Avishek Pal 1 month ago in reply to YM Yeh

This is an expected behavior.

PLIM = VDS x IDS, not VIN x IIN or VOUT x IOUT

PILM is used to limit the MOSFET power loss.

Power management forum