TPS40054 Maximum duty cycle too low

Bert Miermans

Prodigy 20 points

Other Parts Discussed in Thread: TPS40054

I want to charge a battery to 14V from a solar panel which has it's max. power point at around 15.5V.

Is there a way to increase the maximum duty cycle above the worst case value of 85% at an input voltage of 15.5V?

over 12 years ago

0 Na Kong over 12 years ago

TI__Genius 17240 points

Hi Bert,

If the battery does not need to share the same ground as the solar panel, you may consider using the inverting buck-boost instead of buck converter. And you can still use the TPS40054/5/7 as the controller. The following app note is an example for configuring buck controller to be an inverting buck-boost controller.

http://www-s.ti.com/sc/techlit/SLVA257

Regards,

0 Bert Miermans over 12 years ago in reply to Na Kong

Prodigy 20 points

Hi Na,

Thank you for answering. I like to keep in- and output negatives to system ground and have the high efficiency of the synchronous buck. I will try to find a solar panel which has Vmpp at 17V.

Best regards,

Bert

Power management

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TPS40054 Maximum duty cycle too low