TPS51200A-Q1: Output short circuit

Koji Hayashi92

Part Number: TPS51200A-Q1

Hi TI-team

My customer shorted Vout output capacitor to GND.

At the moment when the capacitor is short-circuited, a large current flows from Vout, the PGOOD pin becomes LO, and the Vout current stabilizes.

1.Please tell me the current value that OCL detects.

2.When the current of Vout is short-circuited, a large current flows and then becomes a low current.

Please tell me the reason.

Is this foldback ?

Where can I find it on the data sheet ?

3.The PGOOD pin goes LOW the moment the output capacitor is shorted to GND.

Is it due to OCL ?

I will send the waveforms if necessary, so let me exchange them individually.

Best Regards,

Koji Hayashi

0 Qian Chen over 5 years ago

Hi Koji,

1. The OCL level is in spec table on datasheet page 5. It is between 3A and 4.5A.

2. In datasheet section 7.3.7, OCL level is reduced to half when output voltage is not withing power good window.

3. When output is shorted to ground, Vout is not in power good window, PGOOD pin will be pulled low internally. This is normal behavior.

Thanks

Qian

0 Koji Hayashi92 over 5 years ago in reply to Qian Chen

Hi Qian-san

Thank you for response.

I understand.

Best Regards,

Koji Hayashi

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