Hello.
I have recently brought a TPS61165EVM-283 kit to evaluate the TPS61165 chip for a product I am developing.
I am a little unclear as to what the maximum LED current this device will drive. I am aware that it is dependent on many variables including Vin, Vout, Inductor values, etc.
Using this kit and the components loaded on-board I can not seem to drive my LED's much above 450mA.
I have changed the Feedback resistor from 0.56R down to 0.28R ( 2x0.56R in parallel ) which should give me a theoretical drive output of ~700mA
I have tried increasing the output capacitance by adding a 4.7uF tant to C4 but this didn't seem to help.
My current specs are as follows
Power supply 5V 3A bench regulated power supply ( only drawing about 1.0A )
Vout for LEDS, 9V and 12V ( 2 different types )
CTRL is tied to Vin so no PWM control, all other components are stock.
I was wondering should I change the inductor value or the schottky diode as it only has a continuous forward current rating of 0.5A
I was just wondering if anyone has used these chips to drive a 700mA output before.. I think the specs say it can switch upto 1.2A but all the graphs and ratings only seem to go to 350mA
Any design advise would be greatly appreciated.
Kind regards
Adam