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AP5724 Datasheet(PDF) 2 Page - Diodes Incorporated

Part No. AP5724
Description  WHITE LED STEP-UP CONVERTER
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Maker  DIODES [Diodes Incorporated]
Homepage  http://www.diodes.com
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AP5724 Datasheet(HTML) 2 Page - Diodes Incorporated

 
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AP5724
WHITE LED STEP-UP CONVERTER
AP5724
Document number: DS31843 Rev. 3 - 2
2 of 17
www.diodes.com
July 2010
© Diodes Incorporated
Pin Descriptions
Pin Name
Description
SW
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
GND
GND pin.
FB
Feedback Pin. Reference voltage is 0.1V. Connect cathode of lowest LED and a sense
resister here. Calculate resistor value according to the formula: RSET = 0.1V / ILED
EN
Converter On/Off Control Input. A high input at EN turns the converter On, and a low input
turns it off. If On/Off control is not needed, connect EN to the input source for automatic
startup. The EN pin cannot be left floating.
OVP
Output Voltage detect pin for over voltage protection.
VIN
Input Supply Pin. Must be locally bypassed with 1
μF or 2.2μF to reduce input noise.
Functional Block Diagram
1.2MHz
Oscillator
RAMP
Generator
Σ
-
+
VREF
0.1V
VIN
3
FB
Rc
Cc
Comparator
A2
CONTROL
LOGIC
A1
1
Driver
SW
Q1
2 GND
4
EN
Enable
6
OTP
5
OVP


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