SP7615
Evaluation Board Manual
Cost Effective LED driver
Constant current output ideal for Driving LED strings
Four Channel LED Driver provides matched LED current
Current adjusted via an external resistor
PWM dimming possible by using either the ENABLE
or the I
SET
pin
Small 2mm x 3mm DFN power package
Outputs can be connected in parallel to increase drive
Constant current for wide cathode voltage range
(0.5V to 16V)
Highly integrated design, minimal components
Thermal shutdown protects the driver
DESCRIPTION AND BOARD SCHEMATIC
The
SP7615 Evaluation Board
is designed to help the user
evaluate the performance of the SP7615 for use as a single
Luxeon 1W LED Driver or 4 LED Driver with matched currents.
The evaluation board is a completely assembled and tested
surface mount board which provides easy probe access points
to all SP7615 inputs and outputs so that the user can quickly
connect and measure electrical characteristics and waveforms.
Two versions of the Evaluation Board schematic diagram are
shown at Figure 1 and Figure 2.
The SP7615 is a linear constant current driver designed to drive multiple LEDs in series from a high input
voltage rail or single high current LED. The driver acts as a high current matched four channel current
source ensuring constant LED current for a range of input voltage. 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 R1. 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 flickering. The built-in thermal protection
automatically adjusts LED current to prevent overheating.
Figure 1. SP7615 Evaluation board with a single Luxeon 1W LED
Rev Aug24-06
SP7615 Evaluation Board Manual
漏 2006 Sipex Corporation
1
2
3
4
