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LM5039: LM5039 24Vout circuit discussion

Kygo Cheng

Expert 6830 points

Part Number: LM5039

Hi Team

We have discuss before, please refer to following link:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1084581/lm5039-lm5039-soft-start-circuit

If used in 24V output system (24Vouut as shown below)
1. How many volts is suitable for the red frame ZD?! (The reference of the error amplifier is also the LM4041-1.2 in the picture)

2. In addition to LM5027EVM using this soft start circuit, is there any other reference circuit using this soft start circuit?! Thank you

over 2 years ago

0 Hong Huang over 2 years ago

TI__Guru 69285 points

Hi,

As this is a continuing support, I am forwarding it to Teng for his support.

0 Kygo Cheng over 2 years ago in reply to Hong Huang

TI__Expert 6830 points

Hi Hong

Looking for you & Teng feedback

0 Teng Feng over 2 years ago

TI__Genius 13660 points

Hi,

the voltage of Zener depends on required pre-bias thread.

3.6V is ok, but i think A higher pre-bias voltage may be more suitable for 24V output.

0 Kygo Cheng over 2 years ago in reply to Teng Feng

TI__Expert 6830 points

Hi Teng

Thank you

1.How many volts of the ZD do you think is suitable for the 24Vout? maybe 5V or...

2. In addition to LM5027EVM using this soft start circuit, is there any other reference circuit using this soft start circuit?! Thank you

0 Teng Feng over 2 years ago in reply to Kygo Cheng

TI__Genius 13660 points

Hi Kygo,

This is the indicator secondary bias voltage, so 3.6V is ok if the same circuitry.

Below is a simpler secondary soft start solution for your reference.

Regards,

Teng