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Duty-cycle up to 100%

Thread Summary

The user inquired about using the LT3845A at 100% duty cycle for 300ms to maintain an output voltage equal to the input (24V-32V) before dropping to 15V. The final answer indicated that the LT3845A cannot operate at 100% duty cycle, but suggested the LTC3824 and LTC3864 as alternatives that can. For space applications, the LT8650S can operate up to 99% duty cycle in burst mode, or a prioritizer can manage two voltage sources.
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Category: Hardware
Product Number: LT3845A

Dear All,

I've a question about maximum duty-cycle of LT3845A.

In our application, starting from a 28V bus (range 24V - 32V), we need an output voltage which is equal to input bus for a definite time (< 300ms) and than goes down to 15V.

Is it possible to use this PWM controller, running it at 100% duty cycle for the first 300ms?

Thanks in advance for your reply.

Kind Regards

Stefano