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AXElite

AX2012 Datasheet Preview

AX2012 Datasheet

1.9A Fixed Frequency White LED Driver

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AX2012
1.9A Fixed Frequency White LED Driver
GENERAL DESCRIPTION
The AX2012 is a step-up converter designed for driving up to 8 series white LEDs for
backlighting application. The AX2012 uses current mode, 1.2MHZ fixed frequency
architecture to regulate the LED current, which is set through an external current sense
resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The
OV pin monitors the output voltage and turns off the converter if an over-voltage condition is
present due to an open circuit condition. The AX2012 includes under-voltage lockout, current
limiting and thermal shutdown protection preventing damage in the event of an output
overload. The driver is available in small 6-pin TSOT-23 and 8-pin TDFN (2mm x 2mm)
packages.
FEATURES
- 2.5V to 5.5 V operating input voltage range
- Drives up to 8 series White LEDs
- 1.2MHz Fixed Switching Frequency
- Wide range for PWM dimming (200Hz to 200KHz)
- Internal 1.9A switching current limit
- Over Voltage Protection (OVP)
- Internal Soft-start Function
- Current limit and Thermal shutdown protection
- Under voltage Lockout
- Available in the 6-pin TSOT-23 and 8-pin TDFN Packages
1/11




AXElite

AX2012 Datasheet Preview

AX2012 Datasheet

1.9A Fixed Frequency White LED Driver

No Preview Available !

AX2012
BLOCK DIAGRAM
VCC
EN
UVLO
Soft Start
Reference
1.238V
300mV
Enable
Logic
10ms
Summing
Comparator
Shutdown
Thermal
Shutdown
OVP
OV
LX
FB
Error
Amplifier
Control and
Driver Logic
N-MOS
Oscillator
1.2MHz
Slope
Compensation
Current
Sense
GND
PIN ASSIGNMENT
The packages of AX2012 are TSOT23-6L and TDFN-8L; the pin assignment is given by:
GND 1
8 SW
VCC 2
OV 3
EN 4
(GND)
7 NC
6 FB
5 GND
TDFN-8L (2*2)
(Top View)
SW 1
GND 2
FB 3
6 VCC
5 OV
4 EN
Name
Description
GND Ground Pin
VCC Power Input Pin
OV OVP Sense Pin
EN
Enable with Dimming Pin; Internal
Pull-Low; Logic High Active
FB
Feedback Pin; Put a Resistor to GND
to Setting the Current
NC No Connect Pin
SW Switch Output Pin
TSOT-23-6L
2/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Nov.05, 2010


Part Number AX2012
Description 1.9A Fixed Frequency White LED Driver
Maker AXElite
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AX2012 Datasheet PDF






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