TPS4H160-Q1: Minimum Load to disable open load fault

Sadiq Mohiuddin

Prodigy 10 points

Part Number: TPS4H160-Q1

Tool/software:

Hello Support,

I am planning to use TPS4H160A-Q1. What is the minimum load that is required disable open load fault?

Sadiq

2 months ago

0 Nicholas Petersilge 2 months ago

TI__Intellectual 2950 points

Hi Sadiq,

An Open load fault is cleared when (Vvs -Vout > V(ol,off)):

so you would need the voltage difference between Vin and Vout to be greater than 2.6V

however as their is only a pullup on VOUT you only need a resistance that pulls down more than R Pull Up

Best Regards,
Nicholas Petersilge

0 Sadiq Mohiuddin 2 months ago in reply to Nicholas Petersilge

Prodigy 10 points

If you add a pull down resistor at the output than there is always a path to ground. ( no open load condition). This equation (Vvs -Vout > V(ol,off) is true

Why we need pull up in this case?

0 Nicholas Petersilge 2 months ago in reply to Sadiq Mohiuddin

TI__Intellectual 2950 points

Hi Sadiq,

Open load detection is a feature of the device to determine if there isn't a load.

The device always had a leakage current so in order for the device to determine if their is an open load it needs a pull up resistor between VS and VOUT

Best Regards,

Nicholas Petersilge

Power management

Power management forum

TPS4H160-Q1: Minimum Load to disable open load fault