AP8801

AP8801 500mA LED Step-down Converter Features www.datasheet4u.com LED driving current up to 500mA Operating input voltage up to 48V High efficiency up to 92% High switching frequency up to 500kHz PWM/DC input for dimming control Built-in output open-circuit protection SOP-8L and MSOP-8L are available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) General Description The AP8801 is a step-down DC/DC converter designed to drive LEDs with a constant current. The device can drive up to thirteen LEDs, depending on the forward voltage of the LEDs, in series from a voltage source of 8V to 48V. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AP8801 switches at frequency up to 500kHz. This allows the use of small size external components, hence minimizing the PCB area needed. Maximum output current of AP8801 is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved by applying either a DC voltage or a PWM signal at the CTRL input pin. An input voltage of 0.2V or lower at CTRL shuts down the output at SW and puts the device into a low-current standby state. Applications Commercial & industrial lighting Small LCD panel backlight Appliances interior lighting Architecture Detail lighting Typical Application Circuit 24V_DC VIN CTRL SET RSET = 0.43Ω D1 AP8801 C1 = 2.2μF GND SW L1 = 100μH ...