TPS65132: Output voltage issues in default mode

Ambroise Suter

Part Number: TPS65132

Hello,

we are using the TPS65132W in factory (default) settings. For some reasons we need +5V and -5V on the outputs but we get +5V and +0.6V.

Can you help us debug this issue?

Thank you and best regards,

Ambroise

over 3 years ago

0 Liaqat Khan over 3 years ago

TI__Mastermind 18550 points

Hello Ambroise,

I think the flying capacitor (C365) in your schematics is too high at 4.7uF. It should be reduced to 2.2uF. This could be what is causing the negative voltage issue.

Kind Regards,

Liaqat

0 Ambroise Suter over 3 years ago in reply to Liaqat Khan

TI__Expert 3820 points

Hi Liaqat,

Swapped the Cap (C365) and it is still the same. Any other suggestions?

Best regards,

Ambroise

0 Liaqat Khan over 3 years ago in reply to Ambroise Suter

TI__Mastermind 18550 points

Hello Ambroise,

If C365 has been swapped with 2.2uF capacitor, I do not see anything else wrong for having the incorrect output voltage so I am not sure what else to suspect except possible board assembly issues.

Once other item I did notice, which is likely un-related to wrong output voltage, is that the resistors from SCL/SDA to 5V should not be 0 ohm and should be something like 4.7K ohm.

Kind Regards,

Liaqat

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TPS65132: Output voltage issues in default mode