Datasheet

Order No. 18 18 08
KSQ-1W - 350 mA CONSTANT-CURRENT-SOURCE FOR
HIGH-POWER-LEDS
− High efficiency, low heat generation
− Constant current output over wide supply voltage range
− Separate input for current regulation (PWM/Voltage)
− Mechanical dimensions: 34 x 10 x 5 mm
− Connecting pads are gold coated
Technical Data:
Supply voltage : 8 - 30 V/DC
Output current : Constant current 350 mA
Ambient temp.-range : -20 to +70°C
Protection : Output: Permanent short circuit protection
Input: Reverse voltage protection
The current-source drives up to 6 high-power-LEDs. The backside of the board is used for
cooling. In case of high loads there can be a need to use an additional heatsink.
Please notice: The thermal plate is connected to the GND potential of the supply voltage.
In case of using more than one source for one heatsink this may require an isolation
between the current source and the heatsink.
The adjust input allows to set the output current in the range of 0 to 100 %. For an adjust
input voltage between 0.3 and 1.25 V the current can be calculated as shown:
I
LED
= (V
Adj
/ 1.25 V) * (100 mV / R
S
) R
S
= 0.3 Ohm
If the adjustpin voltage is below 0.3 V the output switches off (necessarry for PWM). If the
adjust input is left floating, the presetted output currents will be given.
Wiring diagramm:
Irrtümer und technische Änderungen vorbehalten / Stand: 08.04.2010 / Roschwege GmbH Deutschland
Technical modifications and mistakes reserved / Rev. Date: 08.04.2010 / Roschwege GmbH Germany
016138 6271214