AP8802_0912 Datasheet, PDF (1/16 Pages) Diodes Incorporated – 1A LED Step-down Converter

AP8802
1A LED Step-down Converter
Features
General Description
• LED driving current up to 1A
• High efficiency up to 92%
• Operating input voltage up to 48V
• High switching frequency up to 500kHz
• PWM/DC input for dimming control
• Built-in output open-circuit protection
• SOP-8L, SOP-8L-EP and DFN3030-10 are available in
“Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
The AP8802 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
AP8802 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 AP8802 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
AP8802 Rev. 5
DS31766
Figure 1: Typical Application Circuit
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DECEMBER 2009
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