TPS55340: SLVA559 mistake in input capacitance calculation

Dmil

Intellectual 390 points

Part Number: TPS55340

Hi,

you have a mistake in equation 24,

Dmax must be in the nominator.

The higher duty cycle is, the higher the capacitance must be.

over 5 years ago

0 Brigitte over 5 years ago

TI__Guru 65200 points

Hello Dmil,

You could use the feedback link in the document directly for such feedback.

0 Youhao Xi over 5 years ago

TI__Guru* 78190 points

Hi Dmil,

Sorry I am confused. Which equation do you refer to? Equation (24) of the datasheet is about the feedback resistor divider, and it has nothing to do with the duty cycle.

Thanks,

Youhao Xi, Applications Engineering

0 Dmil over 5 years ago in reply to Youhao Xi

Intellectual 390 points

Hi,

See, please, SLVA559 "Isolated Continuous Conduction Mode Flyback Using the TPS55340", p.8, 2.8 Input Capacitor, eq (24)

0 Yinsong Cai1 over 5 years ago in reply to Dmil

TI__Expert 7450 points

Hi Dmil,

I think it is a typo. Dmax should be flipped. Thank you for the information.

Thanks,

Yinsong

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TPS55340: SLVA559 mistake in input capacitance calculation