lm5017 ISOEVAL query

Mahendra Patel1

Expert 3560 points

Other Parts Discussed in Thread: LM5017

Hello team,

LM5017 ISO EVAL uses 2kohm (R10) of mimimum load on the board (on isolated output rail).

Is there a method to calculate the optimum value of this resistor?

Regards,

Mahendra Patel

over 10 years ago

0 Mahendra Patel1 over 10 years ago

TI__Expert 3560 points

Any inputs on this query?

or is it by trial and error method?

Regards,

Mahendra Patel

0 Sourav.Sen over 10 years ago in reply to Mahendra Patel1

TI__Intellectual 2320 points

Hello Mahendra,

To reduce the leakage inductance effects on the secondary output, especially at light load/no load conditions, pre-load resistors are used. The larger the pre-load (smaller resistance), the better the voltage regulation at light loads, although this means a trade off of more power losses.

There is no specific practical formulae for this pre-load calculation.

Regards,

Sourav

Power management

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lm5017 ISOEVAL query