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.