TPS2HB16-Q1: When EN1 is low, output is getting 5V.

Hi Alihussain,

Thanks for contacting us. Do you have load connected to Vout1? If so, could you disconnect the load and observe if you see the same behavior?

Also it would be good to capture the output waveform to get more information.

If you have spare parts, it might be good to swap the part to a new part to see if you observe the same issue.

Please keep us updated.

Regards,

Yichi

1) No, I am checking without load. With load the behavior is same.

2)I am attaching the waveforms.

3) I have changed the part also, but output is same.

Could you label the channels in each waveform?

A couple things worth trying:

1. If you increase/decrease battery voltage, does the output change when you have EN1=0V?

2. What's the value for R132 - 47e? Could you try 4.7kohm?

3. Probe EN1 at the pin when you feed 0V to make sure the pin is seeing 0V as well.

4. Probe SNS pin to see if you are getting a fault.

5. There is an internal pull up resistor of 1Mohm. If you have large impedance at the output, that could form a voltage divider. You can try to connect an external pull up resistor from Vs to output with around 15kohm to see the effect goes away.

Thanks,

Yichi

1. Yes, Vout1 changes when EN1=0V.

2. R132 was 47E, I repaced with 47k but it didn't work.

3. I probe the EN1 pin and it is seeing 0V when I am feeding 0V.

4.SNS pin is showing 0V.

5. But I tried with pulling down the Output and it works. Thanks for the help @Yichi Zhang.