Hello team,
We are trying to develop a LED driver with TPS61165 with three nos. of 1 W LEDs in series at the output and the circuit configuration as given in the typical application on the first page of the data sheet.
The CTRL pin was tied to Vin during the operation.
The observations are as follows:
- When the input voltage is increasing, the output voltage increases in boost mode. At no load, when the input is 5 V, the output is 36 V.This is ok.
- When the LEDs are present at the output, the output voltage seems to follow the input voltage and the LED brightness is very low. There was sort of a blink at Vin of 2.3 V and then the LED doesn't glow.
- When the inductor value is changed from 10 uH to 22 uH, the output voltage increases rapidly to very high voltage(> 500 V!) and the current also spikes to above 9 A!! This surprising observation happens at Vin of around 2.5 V. So we then decrease the voltage after the same.
We are basically trying to develop LED driver for LED wattage of 0.5 W to 3 W using a single Li-Ion 3.7 V battery of 1100 mAh to 2600 mAh capacity.
Inputs to solve the issues and configure TPS61165 for our current requirement will be really appreciated.
I look forward to hearing from you soon.
Regards,
Mehul Raval.
