Rev Aug24-06

SP7615 Evaluation Board Manual

© 2006 Sipex Corporation

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

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

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

SP7615

Evaluation Board Manual