Typical application circuit of XLT604 in AC and DC input

XLT604 is a PWM high-efficiency LED driver controller designed using BICMOS technology . It can effectively drive high-brightness LEDs within the input voltage range of DC8 to 450V. The chip can drive external MOSFETs at a fixed frequency of up to 300kHz, and its frequency can be determined by external resistor programming. The external high-brightness LED string can be controlled in a constant current manner to maintain constant brightness and improve the reliability of the LED; its constant current value can be determined by an external sampling resistor, and the current range ranges from a few milliamps to 1A.
　　When using XLT604 to drive an LED, its brightness can be linearly adjusted through an external control voltage, or the brightness of the LED string can be adjusted through an external low-frequency PWM method.