Diodes AP8802H - Manual (Page 2)

AP8802H
60V 1A LED STEP-DOWN CONVERTER
AP8802H
Document number: DS32227 Rev. 6 - 2
2 of 14
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May 2012
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PRELIMINARY
NEW PROD
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T
Pin Descriptions
Pin Name Function
SW Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
GND GND pin
SET Set Nominal Output Current Pin. Configure the output current of the device.
CTRL
Dual function dimming control pin with an input impedance approximately 50k Ω.
• Input voltage of 0.2V or lower forces the device into low current standby mode and shuts off the output.
• A PWM signal (driven by an open-drain/collector source) allows the output current to be adjusted over a wide
range up to 100%.
• An analog voltage between 0.3V and 2.5V adjusts the output current between 24% and 200% of the current
set by 0.2V/R
S
.
If the CTRL pin is left open then its voltage will default to V REF
V IN Input Supply Pin. Must be locally bypassed.
EP Exposed pad: Internally connected to IC substrate. It should be connected to GND and as large as possible thermal
mass for improved thermal impedance and power dissipation capability. See Land Pad diagrams.
NC No connection
Functional Block Diagram
Figure. 1 Functional Block Diagram