Buck controller with 100% maximum duty cycle

Ivan Chen1

I need a buck solution with 100% maximum duty cycle. Output of my application is 5V with 13A max. load and ~8A continuous load at 85 ℃ ambient temperature. Is there any buck controller with 100% maximum duty cycle?

over 6 years ago

0 Marshall_Beck over 6 years ago

TI__Mastermind 35210 points

All regulators I am aware of have a min off time figure, with that time dictated by the time to recharge the boot cap.

The min off time is a major contributor in determining max duty cycle, with many of the regulators I support being 98%.

Is 98% enough to fulfill your application?

0 Marshall_Beck over 6 years ago in reply to Marshall_Beck

TI__Mastermind 35210 points

It does look like you need a controller.

Here is one example, but I am not sure if it fulfills your input requirements?

The device has low min off time to achieve large duty cycle.

http://www.ti.com/lit/ds/symlink/lm5145.pdf

0 Marshall_Beck over 6 years ago in reply to Marshall_Beck

TI__Mastermind 35210 points

For lower power converters who integrate there bootcap you can get 100% DF.

http://www.ti.com/lit/an/slyt747/slyt747.pdf

0 Ivan Chen1 over 6 years ago in reply to Marshall_Beck

Prodigy 20 points

It should be ok.

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Buck controller with 100% maximum duty cycle