3

Feb 9-07 Rev E

Constant Current LED Driver

© 2007 Sipex Corporation

PIN ASSIGNMENTS

Pin #

Pin

Name

Pin Function

 - 2

LED

LED Current Sink. Connect LED cathode to this pin. Voltage at this pin

should be above 00 mV to maintain regulation.

3

Vcc

Power Supply Input. Place µF decoupling capacitor next to this pin

4

EN

Enable/Shutdown pin used to enable/disable driver and reset time count

Logic High – enable, Logic Low – disable/reset.

5

CTRL

Flash or Torch mode. CTRL = LOW selects Torch mode (200mA), CTRL =

HIGH selects Flash mode 500 (700)mA.

6

GND

Ground pin for control and bias blocks.

7 - 8

GNDP Ground pin. LED current flows through this pin to ground.

BLOCK DIAGRAM