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参数资料
| 型号： | GM2102 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | LED驱动器 |
| 英文描述： | CONSTANT CURRENT DC/DC WHITE LED DRIVER |
| 中文描述： | 恒电流DC / DC白光LED驱动器 |
| 文件页数： | 1/6页 |
| 文件大小： | 194K |
| 代理商： | GM2102 |
GM2102
CONSTANT CURRENT DC/DC WHITE LED DRIVER
Revision 1, March 2003 1 www.gammamicro.com
PRELIMINARY
The
GM
2102 is a member of
Gamma Microelectronics
’s
family
of white LED drivers.
The
GM
2102 is a fixed frequency step-up DC/DC
converter designed to operate as a constant-current
source. It is ideal for driving light emitting diodes (LEDs)
whose light intensity is proportional to the current
passing through them and not on the voltage across their
terminals as it directly regulates the output current.
The wide input voltage range allows the device to work
from a variety of input sources.
A single external
resistor sets LED current between 5mA and 40mA,
which can then be easily adjusted using either a DC
voltage or a
PWM signal
.
In Shutdown mode, the
LED’s are disconnected from the output with the
maximum quiescent current of 1μA for the entire circuit.
GENERAL DESCRIPTION
Drives Six White LED’s from 1.8 V
1.2Mhz Fixed Frequency Switching
Minimum operating input voltage 1.2V
9
0% efficiency
Accurately adjustable LED current
Current Regulation even when
Vin > Vout
Disconnects LED’s in Shutdown mode
Available in SOT23 Package ideal for
space conscious portable applications
FEATURES
APPLICATIONS
Cellular Phones
Digital Cameras
Handheld Computers
Portable Audio players
Pagers
Other White LED applications
TYPICAL APPLICATION
GM
2102
1
3
2
4
5
6
LED
SW
Vin
SHDN
GND
Rset
PWM
DIMMING
CONTROL
SIGNAL
Vin
2.7V to 4.2V
15mA
6.8 uH
D1
C1
4.7 uF
C2
1 uF
Rset
1.5K
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