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LM5041: AN-1299 LM5041 Evaluation Board: the usage of D11 (CMPD2838-NSA) or the actual purpose of the diode in the circuit

Nesh Johny
Expert 1310 points
Part Number: LM5041

Dear Sir,

I'm planning to use LM5041 IC for my new project, but while going through the schematic of the AN-1299 LM5041 Evaluation Board, I found diode D11 (CMPD2838-NSA) which is connected to Vcc.

I have following doubts regarding the use if D11 in the circuit:

1. The Input Output isolation will it have any effect.

2. What is the actual purpose of the diode in the circuit.

3. Upto what Max frequency can i use this topology ( as per datasheet it can go upto 1MHz), but atleast can i go upto 900KHz  for the buck side, so 450KHz for Push Pull.

Thanks and Regards,

Nesh

  • 0
    TI__Mastermind 34465 points

    Hello Nesh,

    It looks like this is a slight error in the data sheet.

    The VCC and VEE  that you have circled above are the power rails to OPAMP U4 in the secondary side.

    This VCC is being generated from the secondary winding of  T4 and T4 with diodes D11

    It is not related to the VCC on the primary side and actually should really be labelled some other name.

    It is not a node name , just a label and so you have electrical isolation.

    The LM5041 has a maximum  useable oscillator frequency of  1MHz so it is suitable for your application.

    Regards

    John