Diodes AP5724 - Manual (Page 2)

AP5724
Document number: DS31843 Rev. 4 - 2
2 of 15
www.diodes.com
December 2013
© Diodes Incorporated
AP5724
Pin Descriptions
Pin Name Functions
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: R
SET
= 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.
V
IN
Input Supply Pin. Must be locally bypassed with 1μF or 2.2μF to reduce input noise.
Functional Block Diagram
1.2MHz
Oscillator
RAMP
Generator
Σ
-
+
-
+
- +
V
REF
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
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
V
IN
VIN Pin Voltage -0.3 to +7 V
VSW SW Voltage -0.3 to +34 V
V
OVP
OVP Pin Voltage -0.3 to +35 V
V
FB
Feedback Pin Voltage -0.3 to +7 V
EN EN -0.3 to +7 V
T
J(MAX)
Maximum Junction Temperature 150 °C
T
LEAD
Lead Temperature 300 °C
T
ST
Storage Temperature Range -65 to +150 °C
Caution: Operation above the absolute maximum ratings can cause device failure. These values, therefore, must not be exceeded under any condition.
Operation at the absolute maximum rating for extended periods, may reduce device reliability.