TPS61041: high current on both the rails required? how to calculate the required parameter values.

Mr. Jadhav

Part Number: TPS61041
Other Parts Discussed in Thread: TPS61040, LM5155,

Dear friends,

I need a positive 24V with an output current of 400mA and a negative 24V with an output current of 400mA. what are the parameters to take care of for high current requirement?

Also, I referred to the below design for the Dual output boost converter. from the data sheet, but the negative output is a unregulated output.

Please suggest a design solution for my requirement.

Regards

jadhav

over 5 years ago

0 Zack Liu over 5 years ago

TI__Mastermind 34231 points

Hi Jadhav,

Since the negative output voltage is unregulated, it could not support 400mA output current.

What's the input voltage in your application? I would suggest you use dual output flyback to generate positive and negative output voltage.

0 Mr. Jadhav over 5 years ago in reply to Zack Liu

Intellectual 580 points

Hi Zack,

I have either 3.3V or 5V as the input voltage.

I will check the dual output flyback concept.

But can u tell me how much maximum current I can generate with TPS61040 chip on the unregulated negative 24v output?

regards,

Jadhav

0 Zack Liu over 5 years ago in reply to Mr. Jadhav

TI__Mastermind 34231 points

Hi Jadhav,

LM5155 is the latest flyback controller. Minimum operating input voltage is 4.5V.

The estimated maximum current would be 100mA for the unregulated negative 24V.

0 Mr. Jadhav over 5 years ago in reply to Zack Liu

Intellectual 580 points

Dear Zack,

Thank you for suggesting LM5155.

Do you have the LTspice model of TPS61041 to simulate before design?

regards

Jadhav

0 Zack Liu over 5 years ago in reply to Mr. Jadhav

TI__Mastermind 34231 points

Hi Jadhav,

Sorry right now TI only provides LM5155 encrypted Pspice model on ti.com.

To get unencrypted Pspice model and simulate in LTspice, you need to contact local FAE and sign NDA with TI.

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TPS61041: high current on both the rails required? how to calculate the required parameter values.