Typical application circuit of XLT604 in AC input

XLT604 is a control chip that 　　can buck, boost, and boost and buck to drive high-power LEDs . The chip is suitable for both AC input and DC input of 8 to 450V. For AC input, in order to improve the power factor, a passive power factor correction circuit can be added to the input end. XLT604 can drive series or multiple series parallel circuits composed of high-power LEDs , and can ensure the brightness and extend the life of the LEDs by adjusting the constant current value. The PWM terminal can use low-frequency pulse width modulation to adjust the brightness of the LED, and also serves as the enable terminal. When this terminal is left floating, the chip has no output control. The chip can also adjust the brightness of the LED through linear voltage regulation at the LD end.