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GM2102 Schematic ( PDF Datasheet ) - Gamma

Teilenummer GM2102
Beschreibung CONSTANT CURRENT DC/DC WHITE LED DRIVER
Hersteller Gamma
Logo Gamma Logo 




Gesamt 6 Seiten
GM2102 Datasheet, Funktion
www.DataSheet4U.com
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






GM2102 Datasheet, Funktion
www.DataSheet4U.com
PRELIMINARY
GM2102
CONSTANT CURRENT DC/DC WHITE LED DRIVER
Vin
2.7 to 4.2 V
6.8 uH
D1
C1
4.7 uF
PWM
DIMMING
C ON TR OL
SIGNAL
61
Vin SW
GM2102
5
SHDN
3
LED
Rs et
GND
42
Rset
1.5K
C2
1 uF
15mA
Li-Ion Driver for Four White LEDs
Vin
2.7 to 4.2 V
4.7 uH
D1
C1
4.7 uF
PWM
DIMMING
C ON TR OL
SIGNAL
61
Vin SW
GM2102
5
SHDN
3
LED
Rs et
GND
42
C2
1 uF
Rset
1.5K
Li-Ion Driver for Five White LEDs
15mA
Vin
5V
10 uH
D1
Vin
3 to 4.2 V
4.7 uH
D1
C1
4.7 uF
61
Vin SW
GM2102
5
SHDN
3
LED
Rset
51.1 K
5 V DC
DIMMING
CONTROL
4
GND
2
C2
2.2 uF
Rset
750 ohms
100 ohms
100 ohms
30mA
5V Driver for 16 White LEDs
Revision 1, March 2003
6
C1
4.7 uF
61
Vin SW
GM2102
53
SHDN
LED
Rset
GND
80.6 K
3.3 V DC
DIMMING
CONTROL
4
2
Rset
1.5K
C2
1 uF
15mA
Li-Ion Driver for Eight White LEDs
www.gammamicro.com

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