AOZ1083 Datasheet, PDF (1/12 Pages) Alpha & Omega Semiconductors – 1.2 A Buck LED Driver

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
z Up to 26 V operating input voltage range
z 240 mΩ internal NMOS
z Up to 95 % efficiency
z Internal compensation
z 1.2 A continuous output current
z Fixed 1.5 MHz PWM operation
z Internal soft start
z 280 mV LED current feedback voltage with ±5 %
accuracy
z Cycle-by-cycle current limit
z Short-circuit protection
z Thermal shutdown
z Small size SOT23-6L
Applications
z Point of load DC/DC conversion
z Set top boxes
z DVD drives and HDD
z LCD Monitors & TVs
z Cable modems
z Telecom/Networking/Datacom equipment
Typical Application
VIN
C1
4.7µF
C3
VIN
BS
DIM
LX
AOZ1083
FB
GND
L1
2.2µH
LED1
R_S
VOUT
C2
10µF
Rev. 1.0 July 2011
Figure 1. 1.2 A Buck HB LED Driver
www.aosmd.com
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