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TPS61021A: About phase margin

Kaji@PAN

Mastermind 7830 points

Part Number: TPS61021A

Hi,

I am considering creating circuits using the TPS61021A device.
I used WEBENCH to check the operation and select a constant.
However, the result of the phase margin is not output to the WEBENCH of this device.
Is it possible to provide phase margin data to me?
Attach the circuit I am thinking now.

(specification)
VIN: 1.5V to 3.4V
VOUT: 3.0V
IOUT: 700mA

Best regards,

over 7 years ago

0 Helen chen over 7 years ago

TI__Mastermind 40080 points

Dear Sir:

Suggest to increase the Cff from 27pF to 100pF to get a better phase margin. Please check the following test result based on Cff=100pF:

1.4VinCff100pF Io=700mA.pdf 2.4VinCff100pF Io=700mA.pdf

0 Kaji@PAN over 7 years ago in reply to Helen chen

Mastermind 7830 points

Thank you for your reply.

As for the attached result, what is the value of the inductor?
I am considering which 0.47 uF or 0.56 uF inductor is good.

Best regards,

0 Helen chen over 7 years ago in reply to Kaji@PAN

TI__Mastermind 40080 points

Dear Sir,

I use a 0.47uH inductor.