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TPS61500: output current issue

Colt Zhang
Expert 3650 points
Part Number: TPS61500

For the output current of the TPS61500:
1, design circuit, design current of 333mA,


2, specification book output current

3, the actual test:
Screen LED current requirements 360mA max., quad, 6 LEDs each, The current per circuit is 90mA

4, actual test voltage of the circuit:
Unloaded output voltage: 20.5V
Load output voltage: 17.7V (PWM open to maximum) PWM frequency is 730Hz
The voltage at the R43 and R44(R3) positions is 180mV and the current is approximately 270mA