LM5009A: output voltage when the current limit occurred

Dice-K

Mastermind 6500 points

Part Number: LM5009A
Other Parts Discussed in Thread: LM5009,

Hi support team.

Please let me know how the output voltage behaves when the current limit occurred.

Regards,

Dice-K

over 4 years ago

0 Daniel Li14 over 4 years ago

TI__Mastermind 27030 points

Hi Dice:

LM5009 Datasheet in 7.3.6 decirpted that Toff will extend when curent hit 0.31A over current threshold. Ton will keep same, so the output will decrease when Toff increased. LM5009A will keep working, but due to Vo derceased, so the total output power will be decreased as well as input current.

Thanks

Daniel li

0 Dice-K over 4 years ago in reply to Daniel Li14

Mastermind 6500 points

Hi Daniel,

Thank you for your reply.

Does Vout become 0V?

Best regards,

Dice-K

0 Daniel Li14 over 4 years ago in reply to Dice-K

TI__Mastermind 27030 points

Hi Dice:

Vo will not drop to 0. Its voltage will depend on the load resistor, Ipeak will be limite to 0.31A, asuming ripple current is 60mA peak to peak, the output current will be limit at 0.28A, Vo~=0.28A*Rload, then FB voltage will decide the Toff time.

Thanks

Daniel Li

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LM5009A: output voltage when the current limit occurred