Category: Hardware
Product Number: LT3760
Hello I am Alper,
I have designed a backlight driver using lt3760. It worked fine with 20mA per string maximum current with CTRL&PWM pins connected to the Vref. However, when I set the max per string current to 100mA, LEDs started blinkining with an increasing frequency starting with 1Hz to 5Hz until I shutdown PS. Vin was fine, Vref was fine. Gate signal stopped during these LED blinking times. I attach voltage signal image on Rsense resistor.
My reasoning is:
My layout has differential routing from Rsense resistor into IC without lowpass filter. However, demo board layout has single routing(instead of differential) from Rsense to IC with a lowpass filter. Do you think it might be the reason? Or what else?
