UCD3138: Question about MCU sink/source current

Steven Rogers86

Part Number: UCD3138

Hi everyone,

Can you please check our circuit.

Our customer raise issue on the our circuit about the MCU sink/source current.

Is it okay to connect capacitor directly on the MCU pin?

Please see below for reference,thanks.

0 Bosheng Sun over 7 years ago

There is no need to add capacitor at DPWM pin, please remove them.

0 Steven Rogers86 over 7 years ago in reply to Bosheng Sun

What's side effects if i still place a capacitor at DPWM pins, thanks.

0 Bosheng Sun over 7 years ago in reply to Steven Rogers86

the DPWM pin has limited sourcing/sinking current, put a capacitor will distort the PWM waveform and increase power loss.

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