LP8863-Q1: LED short detection threshold

Hung Yu-chuan

Prodigy 80 points

Part Number: LP8863-Q1

Condition: Under low temperature environment, LED Short Fault message occurs

LED Array:Four strings and two parallels

LED short detection threshold:shorted_led_thresh = 100(4.2V)

LED VF:2.8~3.6V(temperature:25°C)

LED Driver LED0~5 array:LED0~2 parallels，LED3~5parallels

Why is there an LED Short error message in a low temperature environment of minus 40 degrees? This problem can be solved by increasing the LED short detection threshold to 5.2V.

1 month ago

0 Zhiqian Wu 1 month ago

TI__Genius 16800 points

Hi, Hung

How many LEDs in one string? Could you pls kindly check with the out pin voltage for two sperate LED string?

0 Hung Yu-chuan 1 month ago in reply to Zhiqian Wu

Prodigy 80 points

How many LEDs in one string?

A bunch of four

Could you pls kindly check with the out pin voltage for two sperate LED string?

10V(No error, the machine is normal)

+1 Zhiqian Wu 1 month ago in reply to Hung Yu-chuan

TI__Genius 16800 points

Hi, Hung

For the LED short, it means that one channel is higher than 4.2V and another one is still in the range. Could you pls help to check the voltage when fault happened?

By they way, when fault happened, is the short channel off?