AOZ1083
1.2 A Buck LED Driver
General Description
The AOZ1083 is a high efficiency, simple to use,
1.2 A buck HB LED driver optimized for general lighting
applications. The AOZ1083 operates from a 3 V to 26 V
input voltage range and provides up to 1.2 A of
continuous LED current. The 280 mV LED current
feedback voltage minimizes the power dissipation of the
external sense resistor. The fixed switching frequency of
1.5 MHz PWM operation reduces inductor and capacitor
sizes.
The AOZ1083 is available in a tiny SOT23-6L package.
Features
Up to 26 V operating input voltage range
240 m ? internal NMOS
Up to 95 % efficiency
Internal compensation
1.2 A continuous output current
Fixed 1.5 MHz PWM operation
Internal soft start
280 mV LED current feedback voltage with ±5 %
accuracy
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Small size SOT23-6L
Applications
Point of load DC/DC conversion
Set top boxes
DVD drives and HDD
LCD Monitors & TVs
Cable modems
Telecom/Networking/Datacom equipment
Typical Application
VIN
C1
4.7μF
C3
VIN
BS
L1
2.2μH
DIM
AOZ1083
LX
LED1
VOUT
C2
FB
GND
Figure 1. 1.2 A Buck HB LED Driver
R S
10μF
Rev. 1.0 July 2011
www.aosmd.com
Page 1 of 12
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