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  • TI Thinks Resolved

TPS61196: audible noise for output cap

Expert 2320 points

Replies: 1

Views: 30

Part Number: TPS61196

Dear Sir,

Vin: 10V ~ 14.4V

Vout: 72V, 70mA

SW frequency: 200KHz

Dimming SW frequency : 20KHz

There is Audible noise for output cap. When SW frequency change 200KHz to 800KHz. The audible noise is smaller then 200KHz.

can you advise me about attached schematic.

1. LCD_Main.pdf

  • Hi Dexter,

        For this kind of high current and high output voltage application, especially for PWM dimming, you need to add an electrolytic capacitor for high output voltage ripple.

    Regards

    Sean

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