LED Driver PR4101

Examples for varying LED applications

TYPICAL APPLICATION WITH 12 VAC SUPPLY

The following circuit drives three LEDs in series from a 12...24 VAC supply. LED and driver are supplied

from the full-wave rectified and smoothed voltage. Ideally, after the full-wave rectifier, Vcc is VAC x 1.41,

which is sufficient to drive three LEDs in series from VAC = 12 V. Ripples on the supply should be small

enough to avoid a period in which the voltage becomes lower than the LED forward voltage, or below the

undervoltage shut-off (see specification of VDI).

The undervoltage detection pin VDI is connected to Vcc.

© PREMA Semiconductor GmbH 2006-2014 I rev. 1014

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