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AX2005/A
3A/2APWM Control LED Driver with internal Switch
GENERAL DESCRIPTION The AX2005/A is a high voltage step-down converter designed for driving up to 10 series white LEDs from a 40V system input. The total LED driving current up to 3A (AX2005) / 2A(AX2005A), which is measured through an external current sense resistor. Its low 200mV feedback voltage reduces power loss and improves efficiency. The OVP pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The AX2005 includes current limit, short circuit protection and thermal shutdown protection preventing damage. AX2005/A provides high power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%. Since this converter can accommodate an input voltage up to 40V, it is also suitable for the operation via an AC adapter. FEATURES
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- Input voltage:8V to 40V - Output voltage is com to 38V w.goftech.up - LED Backlight and High Power LED Application - Duty ratio:0% to 100% PWM control - LED driving current: AX2005: Output current up to 3A AX2005A: Output current up to 2A - Enable/Disable function with soft start time control. - Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP). - Over Voltage Protection (OVP) - Built-in internal SW P-channel MOS. - SOP-8L-EP Pb-Free package.
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.4 Jul.06, 2010
AX2005/A
BLOCK DIAGRAM
EN/SS VCC
5uA
START - UP
CURRENT SOURCE BIAS
1.23V REFERENCE
2.5 V REGULATOR
Current limit 0.2V Oscillator .
+
COMP .
COMP.
FB
COMP
PIN ASSIGNMENT the pin assignment is given by: The package of AX2005/A is SOP-8L-EP; •yÑb€
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7 6 5
( Top View ) EN/SS VSS VGATE VCC 1 2
SW
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8 COMP FB OVP SW
3 4 SOP-8L-EP
Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.4 Jul.06, 2010
_ OVP
+ AMP _
PWM - Switched Control Circuit
VGATE
Thermal Shutdown
VSS
OVP
SW
c fote
Name om c . EN/SS h VSS
Description
ON/OFF Shutdown and Soft-start pin GND pin Driver GATE clamping pin. The pin must connect a 1uF capacitor to VCC IC power supply pin Switch pin. Connect external inductor and diode here. Feedback pin
VGATE VCC SW FB
COMP Compensation pin Over-Voltage Sense Input Pin. OVP Over Voltage is set by out side Resistance
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AX2005/A
ORDER/MARKING INFORMATION Order Information
Top Marking
Logo
AX2005 X XX X
Output Current Package Type Packing Blank : 3A ES: SOP-8L-EP Blank : Tube A : Taping A : 2A
AX 2 0
05 A Y Y W WX
Part number ID code: internal WW: 01~52 Year: 10=2010 11=2011 Blank: AX2005 A: 2005A
ABSOLUTE MAXIMUM RATINGS (at TA = 25°C)
Characteristics Symbol Rating Unit
VCC Pin Voltage Feedback Pin Voltage EN/SS Pin Voltage OVP Pin Voltage COMP Pin Voltage VGATE Pin Voltage Switch Pin Voltage Power Dissipation Storage Temper.