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PDF GM2102 Data sheet ( Hoja de datos )
| Número de pieza | GM2102 | |
| Descripción | CONSTANT CURRENT DC/DC WHITE LED DRIVER | |
| Fabricantes | Gamma | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de GM2102 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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PRELIMINARY
GM2102
CONSTANT CURRENT DC/DC WHITE LED DRIVER
GENERAL DESCRIPTION
The GM2102 is a member of Gamma Microelectronics’s
family of white LED drivers.
The GM2102 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.
FEATURES
• Drives Six White LED’s from 1.8 V
• 1.2Mhz Fixed Frequency Switching
• Minimum operating input voltage 1.2V
• 90% 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
TYPICAL APPLICATION
Vin
2.7V to 4.2V
6.8 uH
D1
C1
4.7 uF
PWM
DIMMING
CONTROL
SIGNAL
61
Vin SW
GM2102
53
SHDN
LED
Rset
GND
4 Rset
1.5K
2
C2
1 uF
15mA
APPLICATIONS
• Cellular Phones
• Digital Cameras
• Handheld Computers
• Portable Audio players
• Pagers
• Other White LED applications
Revision 1, March 2003 1 www.gammamicro.com
1 page  
www.DataSheet4U.com
PRELIMINARY
GM2102
CONSTANT CURRENT DC/DC WHITE LED DRIVER
Vin
1.8 to 3 V
4.7 uH
D1
C1
4.7 uF
PWM
D IMMIN G
C ON TR OL
SIGN AL
61
Vin SW
GM2102
5
SHDN
3
LED
Rs et
GN D
42
Rset
1.5K
C2
1 uF
15mA
Two Cell Driver for Four White LEDs
Vin
1.8 to 3 V
4.7 uH
D1
C1
4.7 uF
PWM
D IMMIN G
C ON TR OL
SIGN AL
61
Vin SW
GM2102
5
SHDN
3
LED
Rs et
GN D
42
C2
1 uF
Rset
1.5K
15mA
Two Cell Driver for Five White LEDs
Vin
2.7 to 4.2
V
6.8 uH
D1
C1
4.7 uF
61
Vin SW
GM2102
5
SHDN
3
LED
Rset
GN D
3.3 V PWM
D IMMIN G
C ON TR OL
31.6 K
4
Rset
1.5K
2
C2
2.2 uF
15mA
Li-Ion Driver forTwo White LEDs
Vin
2.7 to 4.2
V
6.8 uH
D1
C1
4.7 uF
61
Vin SW
GM2102
5
SHDN
3
LED
Rset
GN D
3.3 V PWM
D IMMIN G
C ON TR OL
31.6 K
4
Rset
1.5K
2
C2
2.2 uF
15mA
Li-Ion Driver for Three White LEDs
Revision 1, March 2003 5 www.gammamicro.com
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet GM2102.PDF ] | |
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