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Alpha & Omega Semiconductors

AOZ1083 Datasheet Preview

AOZ1083 Datasheet

1.2A Buck LED Driver

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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 minternal 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
GND
FB
L1
2.2µH
LED1
RS
VOUT
C2
10µF
Rev. 1.0 July 2011
Figure 1. 1.2 A Buck HB LED Driver
www.aosmd.com
Page 1 of 12




Alpha & Omega Semiconductors

AOZ1083 Datasheet Preview

AOZ1083 Datasheet

1.2A Buck LED Driver

No Preview Available !

AOZ1083
Ordering Information
Part Number
AOZ1083CI
Ambient Temperature Range
-40 °C to +85 °C
Package
SOT23-6L
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Environmental
Green Product
Pin Configuration
BST 1
6 LX
GND 2
5 VIN
FB 3
4 DIM
SOT23-6L
(Top View)
Pin Description
Pin Number
1
Pin Name
BST
2 GND
3 FB
4 DIM
5 VIN
6 LX
Pin Function
Bootstrap voltage input. High side driver supply. Connected to 10 nF capacitor between
BST and LX.
Ground.
LED current feedback. The FB pin regulation voltage is 280 mV. Connect an external
sense resistor between the cathode of the LED string and GND to set LED current.
PWM dimming pin. This pin is active high.
Supply voltage input. Input range from 3 V to 26 V. When VIN rises above the UVLO
threshold the device starts up.
PWM output connection to inductor.
Rev. 1.0 July 2011
www.aosmd.com
Page 2 of 12


Part Number AOZ1083
Description 1.2A Buck LED Driver
Maker Alpha & Omega Semiconductors
Total Page 12 Pages
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