SP7615EB Exar Corporation, SP7615EB Datasheet - Page 3

• 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

Introduction
The SP7615 is a four channel constant current
source LED driver with programmable output
current level. The design consists of a regulator
bandgap, voltage-to-current converter, and
output mirror drivers. The bandgap ensures good
performance over voltage and temperature.
The four outputs are tightly coupled allowing for
excellent channel matching.
Thermal Shutdown
The SP7615 uses a thermal comparator to
monitor the system temperature shutting the
device down if the internal temperature reaches
150
internal temperature drops below 130
Figure 1: SP7615 Block Diagram
Jul31-07
GND
V
EN
CC
º
C. The device will remain off until the
Bias
SP7615 Four Channel Constant Current LED Driver
I
º
SET
C.
Thermal
Shutdown
V to I
Converter
3
Enable
The device has an enable function that is
designed for TTL level inputs. This input will also
track the V
The enable pin can also be used to control the LED
brightness with a pulse width modulated control
signal. Duty Cycle or PWM control of the LED
current maintains constant LED color while
brightness is changing. The SP7615 responds in
less than 10µs to PWM signals applied to this
pin. The EN pin is internally pulled down with an
approximately 80kOhm resistor. The SP7615 will
remain in shutdown mode if this pin is left open.
CC
pin so levels up to V
THEORY OF OPERATION
Driver
© 2007
BLOCK DIAGRAM
Sipex Corporation
CC
are acceptable.
LED2
LED3
LED1
LED4