Other Parts Discussed in Thread: TPS61500,
Tool/software: WEBENCH® Design Tools
Dear Sir/Madam,
I am driving a few strings of 8 LED and I need 24v output voltage. My input is Lithium ion battery and has a minimum voltage of 3.3V. My output current is 0.2 to 0.4A and I would like to have high efficiency for battery battery life. My question is should I use one step boost from 3.3V to 24V or should I use two step like 3.3V to 9V and 9V to 24V. The goal is to have better efficiency. Using webbench for tps55340. I got a design. But it seems to me it does not work at Vin of 3.3V to have a 24V output. As soon as the output require a current, even 100mA, the output voltage collapse to 10 to 14V.
Thanks.
Jin