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PDF AX2012 Data sheet ( Hoja de datos )
| Número de pieza | AX2012 | |
| Descripción | 1.9A Fixed Frequency White LED Driver | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX2012 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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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
1 page  
AX2012
APPLICATION CIRCUIT
(1) 8 series LED application
VIN=5V
L1
4.7uH
C1
4.7uF
ON
OFF
U1 AX2012
6 VCC
1
SW
4 EN
OV 5
2 GND
FB 3
D1
B240A
8-WLEDs
C2
1uF
ILED= VFB/R3, VFB=300mV
(2) LED Dimming application
VIN=5V
L1
4.7uH
C1
4.7uF
Dimming
200~200KHz
U1 AX2012
6 VCC
1
SW
4 EN
OV 5
2 GND FB 3
D1
B240A
R3
8-WLEDs
C2
1uF
ILED= VFB/R3, VFB=300mV
R3
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Nov.05, 2010
5 Page 
(2) TDFN-8L (2*2 0.75mm)
PIN 1 INDENT
AX2012
1E
1 E2
L
A1
Symbol
A
A1
b
C
D
D2
E
E2
e
L
y
C
y
Dimensions in Millimeters
Min. Nom. Max.
0.70 0.75 0.80
0.00 0.02 0.05
0.15 0.20 0.25
0.19 0.20 0.25
1.90 2.00 2.10
1.55 1.60 1.65
1.90 2.00 2.10
0.85 0.90 0.95
- 0.50 -
0.30 0.35 0.40
0.00 - 0.075
Dimensions in Inches
Min. Nom. Max.
0.028
0.030
0.031
0
0.001
0.002
0.006
0.008
0.010
0.007
0.008
0.010
0.075
0.079
0.082
0.061
0.063
0.065
0.075
0.079
0.082
0.033
0.035
0.037
- 0.020 -
0.012
0.014
0.016
0 - 0.003
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Nov.05, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX2012.PDF ] | |
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