Other Parts Discussed in Thread: LM5180
Hi,
I was trying to rework the LM5180-Q1Single-OutputEVM board to produce 24V output.
Below are the parameter that we get from the PSR Flyback design tool:
We reworked the EVM board as below;
- T1 to YA9036-ALD (From Coilcraft claim to be optimised for LM5180). https://www.coilcraft.com/en-us/products/transformers/power-transformers/no-opto/ya903x/
- Removed the output zener diode.
- Change the Cout to 10uF 50V.
- RFB changed to 121K.
We believe we change all the necessary rework, but we are not able to get the voltage regulated (see ~31V unload and the volage will go low when we enable the E load expected to be loaded with only 1-5mA).
When we increase the Vin to 16.5V then we get the Vout to be 24.8V bit still not able to be load.
Any idea what will be the issue here?
Thanks,
San Lee