TIDA-01558: Changes to support 12V lead-acid battery and 24V Vbus

Terry Jendon1

Part Number: TIDA-01558
Other Parts Discussed in Thread: TPS43060, , LM293

Hello:

I'm looking into the following battery-backup reference design. However, for our application we need to support a 12V battery with a 24V Vbus / boost supply output.

I need some help in verifying that the following changes are basically what is needed. If TI can provide any guidance or help, that would be greatly appreciated.

Modify TPS43060 output resistor FB network (for 24V)
Modify the ULVO (EN pin) based on the 12V battery input.
Modify transitioning circuits between boost (discharging) and buck converter (charge).
Modify the buck converter voltage to support charging the 12V battery.
Modify CC-CV circuit based on 12V battery votlage.

over 4 years ago

0 Huixin Wang over 4 years ago

TI__Intellectual 940 points

thanks for your interest in our design,

I think you don't need to make the third change because LM293 is only used to sense the bulk input voltage to EN bulk. it's not relative to the output voltage. other changes you need to make all have the relationship with 12V/24V battery

0 Terry Jendon1 over 4 years ago in reply to Huixin Wang

Prodigy 25 points

Hi -

Thank you for your response.

This confirms that changes I'll need to make to the design.

I'll just review the change you mention that I wouldn't have to do. I would think I'd need to adjust it based on the VBUS / VLINE (bulk) input that is used for my application, which is 24V. (Buck Transition circuit in Figure 7 of the TIDA-01558 design guide)

I'll run the numbers just to make sure...thanks for your help.

0 Huixin Wang over 4 years ago in reply to Terry Jendon1

TI__Intellectual 940 points

you're welcome. thanks for your interest in our design.

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TIDA-01558: Changes to support 12V lead-acid battery and 24V Vbus