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LMR33630-Q1: schematic review

Ivy Jin
Expert 4625 points
Part Number: LMR33630-Q1
Other Parts Discussed in Thread: LMR33630

Tool/software:

Hi team,

Could you please help review the schematic and give some comments? Thanks! (SW and NC pins have been connected together in the customer's latest design, and have not been modified in the figure below) 

Adjustable voltage regulator:

Vanalog =   0V，Vout=11V@max ；

Vanalog = 2.8V，Vout=0V；

Vin = 9-16V

Output current = 1.1A

Switch frequency = 400kHz

O_P_DcvCurrCtlrFL_M outputs PWM duty to the net-label (FB3) , through the 3-level RC, placing an analog voltage on the FB port which adjusts Vout.

1. May I ask if R1162(10kR resistor) should be placed?

2. Is the value of the C1131 (47pF capacitor) suitable? 

3. Do you have any suggestion on  EMC optimization?

Regards,

Ivy

  • 0
    TI__Expert 5945 points

    Hello Ivy

    We received your question. We will get back to you on the next working day.

    Thanks and Regards,

    naresh

  • 0 in reply to Naresh Adepu
    TI__Expert 5945 points

    Hello Ivy

    1. R1162 (10k resistor) need not be placed

    2. 

    please make sure you use a smaller value. even lesser than 47pF is okay too.

    3. the EMI performance is dependent on the PCB layout, to a great extent. the datasheet shows recommended layouts for the critical components of the LMR33630 - please refer and follow that for better EMI performance. 

    Thanks and Regards,

    Naresh