LED Driver. SP7615 Datasheet

SP7615 Driver. Datasheet pdf. Equivalent


Sipex Corporation SP7615
www.DataSheet4U.com
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


SP7615 Datasheet
Recommendation SP7615 Datasheet
Part SP7615
Description Four Channel Constant Current LED Driver
Feature SP7615; www.DataSheet4U.com SP7615 Four Channel Constant Current LED Driver FEATURES VCC 1 8 LED1 ■ Cost E.
Manufacture Sipex Corporation
Datasheet
Download SP7615 Datasheet




Sipex Corporation SP7615
ABSOLUTE MAXIMUM RATINGS
Vcc, VLED1, VLED2, VLED3,
VLED4, Voltage to GND .......................................0.3V to 16V
EN Voltage to GND..................................... 0 to (Vcc + 0.3V)
ISET Voltage to GND...................................0 to (Vcc + 0.3V)
or 6V, whichever is lower
Output Current per LED (IOUT) ................................. 150mA
Power Dissipation per Package
8-pin DFN at TA = 85ºC ...........................… 1.1W
Junction Temperature ..............................................+150ºC
Storage Temperature ............................... -55ºC to +150ºC
ESD Level. ....................................................... 2kV HBM
DFN Thermal Resistance......................................59ºC/W
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
ELECTRICAL CHARACTERISTICS
4.5V < VCC <16V , VEN = 5V, VLED1 =VLED2 =VLED3 =VLED4 =1.0V, RSET =10kor ISET=126µA, -40 < TA < 85ºC,
Unless otherwise noted. Typical numbers are for TA = 25ºC.
PARAMETER
Supply Voltage
Quiescent Supply Current
Output/I
SET
Current
Multiplication
Ratio
LED Current (per diode)
LED to LED Current Matching
LED Current Line Voltage Regulation
MIN.
4.5
900
-2
LED Current Load Voltage Regulation
LED Current Thermal Regulation
ISET Pin Voltage
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Current in OFF Mode
Min. ENABLE “ON Voltage”
(Note1)
Max. ENABLE “OFF Voltage”
(Note 2)
1.20
0.4
TYP.
5
20
1000
MAX. UNITS
CONDITIONS
16 V
39
mA
ILED1 = ILED2 = ILED3 = ILED4 =126mA
1200
126
0.15
2
9
0.1
1.26
150
20
+2
0.6
4
1.32
1
1.6
mA
%
%/V
%/V
%/V
%/ºC
V
ºC
ºC
IOUT change per volt VCC change
0.4V
<
V
LED
<
5V,
I=
LED
25mA
1.0V < VLED < 5V, ILED = 126mA
ILED = 126mA
ISET = 1µA
µA V EN = 0.0V
V
V
Note 1. ENABLE "ON" is VEN for which ILED > 80mA
Note 2. ENABLE "OFF" is VEN for which ILED < 1uA@ VLED1 > 1.0V
Oct 23-06
SP7615 Four Channel Constant Current LED Driver
2
© Copyright 2006 Sipex Corporation



Sipex Corporation SP7615
VCC
GND
EN
Bias
Thermal
Shutdown
V to I
Converter
BLOCK DIAGRAM
Driver
LED1
LED2
LED3
LED4
Figure 1: SP7615 Block Diagram ISET
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 ensuresgood
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.
THEORY OF OPERATION
Enable
The device has an enable function that is
designed for TTL level inputs. This input will also
track the VCCpin so levels up to VCCare 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. 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.
Oct 23-06
SP7615 Four Channel Constant Current LED Driver
3
© Copyright 2006 Sipex Corporation





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