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PDF SP7615 Data sheet ( Hoja de datos )
| Número de pieza | SP7615 | |
| Descripción | Four Channel Constant Current LED Driver | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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SP7615
Four Channel Constant Current LED Driver
FEATURES
■ Cost Effective LED driver
■ Constant current output ideal for Driving LED strings
■ Four Channel LED Driver provides matched LED
current
VCC 1
EN 2
GND 3
ISET 4
SP7615
8 Pin DFN
8 LED1
7 LED2
6 LED3
5 LED4
■ Current adjusted via an external resistor
■ PWM dimming possible
■ Small 2mm x 3mm DFN package
Now Available in Lead Free Packaging
■ Outputs can be connected in parallel to
increase drive
APPLICATIONS
■ Constant current for wide cathode voltage range ■ Next Generation Mobile Phones
(1.0V to 16V)
■ PDA, DSC, MP3 Players
■ Highly integrated design, minimal components ■ Handheld Computers
■ Thermal shutdown protects the driver
■ LCD Display Modules
■ Keyboard Backlight
■ LED Displays
DESCRIPTION
The SP7615 is a linear constant current driver designed to drive multiple LEDs in series from
a high input voltage rail. The driver acts as a high current matched, four-channel current
source ensuring constant LED current for a range of input voltages. The SP7615 allows
implementing the lowest cost LED driver for a variety of applications. Internal circuitry
maintains the pre-set constant current output for a wide voltage range at the LED outputs
(LED1,2,3,4). LED current can be adjusted up to 125mA per string with an external resistor.
The dimming can be achieved by controlling the ISET input or by feeding a PWM signal to
the EN pin. Fast EN turn-on and turn-off time allows for very fast PWM dimming frequencies,
completely eliminating flicker. The built-in thermal protection automatically adjusts LED
current to prevent overheating.
TYPICAL APPLICATION SCHEMATIC
Oct 23-06
VCC
EN
C1
1n
GND
VCC LED1
®
EN LED2
GND SP7615 LED3
R1 ISET
LED4
SP7615 Four Channel Constant Current LED Driver
1
© Copyright 2006 Sipex Corporation
1 page  
VCC
EN
VMOD
C1
1n
GND
R1
THEORY OF OPERATION
VCC LED1
®
EN LED2
GND SP7615 LED3
ISET LED4
D1
LED
ISET Pin
The ISET pin is the servo point of an amplifier
configured as a voltage-to-current converter.
The voltage at this pin servos to the internal
bandgap potential. A set resistor can be
connected from the Iset pin to the ground to
generate a reference current for the follow-
ing current gain stages. A current could
alternately be applied to this pin in the form
of a current source or current output DAC.
This pin can be used also for LED current
adjustment with external voltage from am-
bient light, optical feedback sensors or other
voltage source. This voltage should not
exceed 1.25V.
The RSET value may be determined as
RSET = (1.26 - V MOD) * 1000/IOUT kΩ,
where 1.26 is a typical ISET pin voltage,
VMOD is an adjustment voltage (V),
1000 is a typical current multiplication ratio,
IOUTis a required LED current in mA/channel.
If adjustment voltage V isn’t used, R
MOD
SET
resistor should be connected to the ground.
Oct 23-06
SP7615 Four Channel Constant Current LED Driver
5
© Copyright 2006 Sipex Corporation
5 Page 
ORDERING INFORMATION
Part Number
Operating Temperature Range
Package Type
SP7615ER .................................................. -40°C to +85°C ............................................ 8 Pin DFN (2 x 3mm)
SP7615ER/TR ............................................ -40°C to +85°C ............................................ 8 Pin DFN (2 x 3mm)
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SP7615ER/TR = standard; SP7615ER-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 3000 for DFN.
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Oct 23-06
SP7615 Four Channel Constant Current LED Driver
11
© Copyright 2006 Sipex Corporation
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SP7615.PDF ] | |
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