TPS61170: I want to make ±24V output with INPUT12V.

Hello,

I'll check and reply to you today.

Regards

Lei

Hello

A 10μH inductor is recommended. Because the TPS61170 has built-in slope compensation to avoid subharmonic oscillation associated with current mode control. If the inductor value is lower than 10μH, the slope compensation may not be adequate, and the loop can become unstable.

A 1Ω charge resistor is recommended to be added in series with the charge capacitor C8.

No other concerns.

Regards

Lei

Hello Lei san

Thank you for your answer.

Is there a calculation tool to create Inverting Power for TPS61170?

Best regards.

miyahara

Hi Miyahara-san,

There is no specific calculation tool for TPS61170, but the PSpice model is available on the following link.

https://www.ti.com/product/TPS61170?keyMatch=TPS61170&tisearch=universal_search&usecase=GPN-ALT#design-tools-simulation

Regards

Lei

Hello　Lei san

I was advised to add 1 ohm in series with C8, but there is an R5 (4.7 Ω) in series with C8.
Please tell me again in what way to put it in.

Regards.

miyahara

Hello　Lei san

I was advised to add 1 ohm in series with C8, but there is an R5 (4.7 Ω) in series with C8.
Please tell me again in what way to put it in.

Regards.

miyahara

Hello miyahara,

What did advice you to place a 1 ohm resistor in series to C8? If it was the calculator, the idea is to replace the 4.7 ohm with 1 ohm.

Best regards,
Brigitte

Hi Miyahara-san,

Sorry I didn't noticed the R5 before. Please ignore my comments of adding a 1Ω resistor in series with C8.

With a suggested 10μH inductor, I think this circuit should work.

Just let me know if you see any concerns.

Regards

Lei