AP8801_0912 Datasheet, PDF (3/11 Pages) Diodes Incorporated – 500mA LED Step-down Converter

AP8801
500mA LED Step-down Converter
Pin Descriptions
Pin Name
SW
GND
SET
CTRL
V_IN
NC
Description
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to
reduce EMI.
GND pin
Set Nominal Output Current Pin. Configure the output current of the device.
Dimming and On/Off Control Input. Input voltage of 0.2V or lower forces the device into low
current standby mode and shuts off the output. A PWM signal allows the output current to be
adjusted above or below the level set by the resistor connected to SET input pin.
The input impedance is about 50kΩ, and if the pin is left open V_CTRL = V_REF
Input Supply Pin. Must be locally bypassed.
No connection
Block Diagram
SET SW
V_IN
CTRL
GND
PWM/DC
Control
V_REF 1.25V
Voltage
Regulator
Sensing
Block
5V
AP8801
R
Figure 2: AP8801 Block Diagram
AP8801 Rev. 4
DS31765
3 of 11
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DECEMBER 2009
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