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LA8303 Datasheet Preview

LA8303 Datasheet

2A/23V Step-Down LED Driver

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LA8303
300KHz, 2A/23V Step-Down LED Driver
General Description
Features
LA8303 is a voltage mode, step-down LED
driver that is designed to meet maximum 2A
constant current for high power LED
application, and utilizes PWM control scheme
that switches with 300KHz fixed frequency.
The input voltage range of LA8303 is from 3.6V
to 23V. It is suitable for series-parallel 1W, 3W,
or 5W high power LED application due to the
high operation voltage and output capability.
At 12VIN, this device can drive up to 15pcs
(3S-5P) 1W LEDs. The 0.21V low feedback
voltage can reduce the power dissipation of the
constant current setting resistor, and improve
the conversion efficiency.
This device provides excellent regulation
during line or load transient. Other features of
external ON/OFF control, current limit, thermal
shutdown protection, and short circuit
protection are also included. It can also
operate with a maximum duty cycle of 100%
for use in low drop-out conditions. The
package is available in standard SOP-8.
l Up to 96% Efficiency
l 0.21V Low Feedback Voltage
l 3.6V to 23V Input Voltage Range
l Driving up to 15 LEDs (1W 3S-5P) at 12VIN
l 300KHz Oscillation Frequency
l Continuous 2A Output Capability
l 100% Duty Cycle
l 3mA Low Supply Current
l 1uA Low Shutdown Current
l PWM or Analog Dimming Control
l Built-in Low RDS(ON) Power MOSFET
l No External Compensation Required
l Adjustable Current Limit
l Short Circuit and Thermal Protection
l SOP-8 Package
l Meet RoHS Standard
Applications
l High Power LED Driver
l Backlight Applications
l General Lighting Solutions
l Constant Current Source
Ordering Information
LA8303 1 2 3 4
1 (Package Type) => J: SOP
2 (Number of Pins) => G: 8pin
3 (Output Voltage) => Blank: Adjustable
4 (Special Feature) => Blank: N/A
Available Part Number
LA8303JG
Marking Information
LA8303JG
1234
1 2 (Date Code)
For date code rule, please contact our sales
representative directly.
3 4 (Internal Code)
LA8303-C01
-1-
Jun. 11, 2009




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LA8303 Datasheet Preview

LA8303 Datasheet

2A/23V Step-Down LED Driver

No Preview Available !

LA8303
Typical Application
l LED Light Bar Application ; Maximum 2A LED Current
DC5V~23V
3.3K
OCSET
3
LA8303
EN
2
SW
5,6
CIN 4.7uF
IN
4
0.1uF
25V 25V
FB
GND
1
7,8
68uH or more
2A SBD
3K
LED Light Bar
220nF
RFB=0.21V/ILED
* CIN up to 10uF or more for Hot-Plugging application
* Power Dissipation on RFB is 0.21VxILED
l High Power LED Application with Dimming Control
DC5V~23V
3.3K
OCSET
3
LA8303
EN
2
SW
10uF
25V
IN
4
0.1uF
25V
GND
7,8
FB
5,6
1
120K
33uH
2A SBD
Optional
5K
RFB=0.21V/ILED
100uF
PWM Dimming
10K
0.1uF
Analog Dimming
or DC 0V~5V
* ILED_MIN / ILED_MAX=0.05
l MR-16 1Wx3 Application ; 350mA Constant LED Current
LA8303-C01
VIN
1A
1A
SBD SBD
2.4K
OCSET
3
LA8303
EN
2
1A 1A
SBD SBD
CIN
25V
IN
4
0.1uF
25V
GND
7,8
VIN
* Recommended CIN : 330uF or more
SW
FB
5,6
1
-2-
47uH
1A SBD
300R
220nF
33R
0.6R
0805
Jun. 11, 2009


Part Number LA8303
Description 2A/23V Step-Down LED Driver
Maker Linear Artwork
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