Tps65283: Tps65283 load conditions are not stable

Hermes Lin1

Intellectual 420 points

Part Number: TPS65283

hi sir:

customer used Tps65283 in unstable load (Wifi module--10K~20KHz)

so they use of special compensation parameters, but also may cause the Duty instability.

we check the Bode plot analysis is no problem, but PWM unstable, whether there will be other problems??

idle mode

Wifi mode

Bode

over 7 years ago

0 Zhao Ma over 7 years ago

TI__Genius 15135 points

Hi,

It looks caused by the compensation circuit.

Could you send me the schematic for checking?

0 Hermes Lin1 over 7 years ago in reply to Zhao Ma

Intellectual 420 points

hi sir:

schematic as below

0 Zhao Ma over 7 years ago in reply to Hermes Lin1

TI__Genius 15135 points

Hi,

The RP5E6 and RP5E5 resistance is too large, please reduce them:
RP5E6 should be changed to 26k from 620k.
RP5E5 should be changed to 85k from 200k.

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Tps65283: Tps65283 load conditions are not stable