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AC/DC and Isolated DC/DC Power
AC/DC and Isolated DC/DC Power Forum
Power Inverter with LM5046
I would like to know if someone used IC LM5046 to design a Power Inverter?
When trying to simulate the design I have the Pins related to the rectifier all grounded. Having no feedback I connect the REF pin into the COMP pin (with some additional circuitry) so I can have a maximum 1mA input and so a constant duty cycle PWM signal for the switches.
However when simulating (I created a model in a PSPICE program usign the LM5046 library) it does not work.
Did anyone try to do something similar?
Thank you all
I have not heard of anyone having problems with the LM5046 SPICE model, can you tell me exactly what is not working? I would leave the pins associated with the the SYN Rectifiers open. The COMP input is a current mirror, can you tell me what the "additional circuitry" is.
Thank you for your reply.
I mentioned a problem with the SPICE model because there is an error when I try to run the sample file on Orcad. However, when building the model on LTSpice no error is generated, so it is probably some mistake in my circuit design. When configuring the RAMP for Voltage mode or Current mode control no Sawtooth is being generated and that is why I mentioned a problem with the library, but I do not think that is the case anymore. Is there any PIN that might prevent the Sawtooth from being generated? (Instead of letting the SYN rectifier pin open I grounded them, I will check that).
About the COMP my first attempt was simply to test different resistor values between REF and COMP until I could obtain the desired current, which is not a good method but it did not work anyway because the voltage on the REF pin does not go over some mV. Then I connected a 0.8mA current source directed in the COMP pin, but again with no PWM signal.
Do you have more suggestions?
Do you know if there is any circuit sample on TI website using LM5046 without the SYN Rectifier? I could not find.
Thank you for all your help
UVLO > 1.25V
SS > 4V
OVP < 1.25V
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