LM2592HV: Phase Margin

Kuramochi Tadahiko

Guru 28715 points

Part Number: LM2592HV

Hi,

I simulated the LM2592HV on the following condition.

VIN=39V, VOUT=15V, IOUT=2A, Ta=25℃

However the simulation doesn't success because phase margin is not enough.

Why is not the phase margin enough on this condition?

Is there any way to be enough phase margin?

Best Regards,

Kuramochi

over 7 years ago

0 Ray Chen over 7 years ago

TI__Prodigy 580 points

Hi, Kuramochi,

Seems when setting output voltage higher than 12V, WEBENCH doesn't accept design with 2A output current.

You need to use LM2592HV-Adj version and modify the output current to 1A.

I generated design below for your reference.

webench.ti.com/.../SDP.cgi

Thanks.
Best regards,

0 Kuramochi Tadahiko over 7 years ago in reply to Ray Chen

Guru 28715 points

Chen-san,

Thank you for your help.
However I'm asking why phase margin is not enough on this condition.

Best Regards,
Kuramochi

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LM2592HV: Phase Margin