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SP7615 Fiches technique(PDF) 3 Page - Sipex Corporation

No de pièce SP7615
Description  Four Channel Constant Current LED Driver
Download  10 Pages
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7615 Fiches technique(HTML) 3 Page - Sipex Corporation

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Date: 08/31/05
SP7615 Four Channel Constant Current LED Driver
© Copyright 2005 Sipex Corporation
BLOCK DIAGRAM
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
150ºC. The device will remain off until the
internal temperature drops below 130ºC.
Enable
The device has an enable function that is
designed for TTL level inputs. This input will
also track the V
CC pin so levels up to VCC are
THEORY OF OPERATION
Figure 1. SP7615 Block Diagram
VCC
GND
EN
ISET
LED1
LED2
LED3
LED4
Bias
Driver
Thermal
Shutdown
V to I
Converter
acceptable. 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.
I
SET Pin
The I
SET pin is the servo point of an amplifier
configured as a voltage to current converter.
The voltage at this pin trips servos to the
internal bandgap potential. A set resistor can
be connected from the I
SET pin to ground to
generate a reference current for the following
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 also have a PWM signal applied
to control the LED brightness.


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