SP7615EB Exar Corporation, SP7615EB Datasheet - Page 5

• Manufacturer Part Number: SP7615EB
• Description: Display Modules & Development Tools LDO LED Drvr for any Color LED w/A Shtdwn
• Manufacturer: Exar Corporation

Specifications of SP7615EB

• Product: Display Modules

Jul31-07
I
The I
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.
SET
Pin
SET
V
GND
pin is the servo point of an amplifier
MOD
V
EN
CC
C1
1n
SP7615 Four Channel Constant Current LED Driver
R1
5
GND
I
V
EN
SET
CC
The R
R
where 1.26 is a typical I
V
1000 is a typical current multiplication ratio,
I
If adjustment voltage V
resistor should be connected to the ground.
OUT
MOD
SET
is a required LED current in mA/channel.
= (1.26 - V
is an adjustment voltage (V),
SP7615
SET
value may be determined as
®
THEORY OF OPERATION
MOD
LED4
LED1
LED2
LED3
) * 1000/I
© 2007
MOD
SET
Sipex Corporation
pin voltage,
isn’t used, R
OUT
kΩ,
D1
LED
SET