TPS61322: TPS61322A looses regulation

ayman hajmousa

Prodigy 130 points

Part Number: TPS61322

When VBAT < 1.5, and I out < 50 mA. it looses regulation, what could be the reason?

I am using electronics load.

over 2 years ago

0 Wenhao Wu over 2 years ago

TI__Genius 9046 points

Hi Sir,

TPS613221A should work properly even Vin is below 1.5V. Would you mind test the voltage on C2 pin and also VOUT when it is out of regulation? Do you have any waveform on inductor current, output voltage and SW voltage when it is out of regulation? Please also share layout to me. Thanks!

-Wenhao

0 ayman hajmousa over 2 years ago

Prodigy 130 points

It is hard to measure inductor current, I can measure the switch voltage, and for some reason it has lots of ringing. I can share Gerber files if you can share your email

+1 Wenhao Wu over 2 years ago in reply to ayman hajmousa

TI__Genius 9046 points

Hi Ayman,

The ringing is normal when converter enters DCM operation. I add your friendship. You can share the AD file to me. Please kindly check voltage on C2 and also VOUT voltage when you see it is out of regulation.

-Wenhao

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TPS61322: TPS61322A looses regulation