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AP5726
WHITE LED STEP-UP CONVERTER
Description
The AP5726 is a step-up DC/DC converter specifically
designed to drive white LEDs with a constant current. The
Pin Assignments
(Top View)
device can drive 2 ~ 6 LEDs in series from a Li-Ion cell.
SW
1
6
V IN
(Top View)
Series connection of the LEDs provides identical LED
currents resulting in uniform brightness and eliminates the
GND
2
5
OVP
SW
1
6
GND
need for ballast resistors. For driving higher number of LEDs,
V IN
2
5
FB
AP5726 also supports a single feedback of parallel
connected multiple strings of equal number of LEDs.
FB
3
74
EN
OVP
3
4
EN
The AP5726 switches at 1.2MHz that allows the use of tiny
external components. A low 0.31V feedback voltage
minimizes power loss in the current setting resistor for better
efficiency.
Features
SOT26 / TSOT23-6
Applications
DFN2020C-6
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High efficiency: 84% typical
Fast 1.2MHz switching frequency
Current limit and UVLO protections
Internal Thermal Shutdown
Internal Over Voltage Protection
Integrated soft-start function
SOT26, TSOT23-6 and DFN2020C-6: Available in
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Cellular Phones
PDAs, Hand help Computers
Digital Cameras
MP3 Players
GPS Receivers
“Green” Molding Compound (No Br, Sb)
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Lead Free Finish/ RoHS Compliant (Note 1)
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html .
Typical Application Circuit
V IN
C IN
1uF
L1
22uH
V IN
SW
D1
2~6 LEDs
C OUT
1uF
ON OFF
AP5726 OVP
PWM Dimming
EN
GND
FB
R SET
15
Figure 1. Typical Application Circuit
AP5726
Document number: DS31845 Rev. 3 - 2
1 of 17
www.diodes.com
July 2010
? Diodes Incorporated
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相关代理商/技术参数
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