TPS61165: Can we let TPS61165 keep in boost function and without dimming?

Statham Su

Part Number: TPS61165

Hello Sir:

If I need to get 12V/300mA by using TPS61165.

Please let us know can we let TPS61165 keep in boost function and without dimming?

I mean just fixed output voltage at 12V and keep CTRL high level, and the schematic is likes figure 16 of datasheet, but without PWM signal.

Is it acceptable? if yes, how can we calculate the output voltage?

Please help to provide recommendations for us.

Thanks a lot.

over 4 years ago

0 Frank Qiu over 4 years ago

TI__Genius 15776 points

Hardy, please help in this case,

+1 Hardy Wu over 4 years ago

TI__Genius 12915 points

Hi Statham,

Yes it is OK to keep CTRL pin high to get VFB at full 200mV. In fact it is also boost mode when there having PWM signal. The device sampled duty cycle from PWM and result in 200mV * duty cycle in FB. Therefor the output current would be reduced.

For the output voltage, you can find the forward voltage @ 300mA from your LED datasheet. Pulsing 200mV VFB, output voltage can be gotten.

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TPS61165: Can we let TPS61165 keep in boost function and without dimming?