AP8801 Datasheet | Diodes Incorporated

500m A LED Step-down Converter Features .. - - - - - - - - LED driving current up to 500m A Operating input voltage up to 48V High efficiency up to 92% High switching frequency up to 500k Hz PWM/DC input for dimming control Built-in output open-circuit protection SOP-8L and MSOP-8L are available in “Green” Molding pound (No Br, Sb) Lead Free Finish/Ro HS pliant (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 500k Hz. This allows the use of small size external ponents, 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 - - - - mercial & industrial lighting Small LCD panel backlight Appliances interior lighting Architecture Detail lighting Typical Application Circuit 24V_DC VIN CTRL RSET = 0.43Ω D1 C1 = 2.2μF GND SW L1 = 100μH Figure 1: Typical Application Circuit AP8801 Rev. 3 DS31765 1 of 11 .diodes. MARCH 2009 © Diodes Incorporated 500m A LED Step-down Converter Ordering Information .. AP 8801 XX G - 13 Package S : SOP-8L M8 : MSOP-8L Green G : Green...