MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE

MP24894 Rev 1.01

www.MonolithicPower.com

7

12/20/2012

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© 2012 MPS. All Rights Reserved.

PIN FUNCTIONS

TSOT6

Pin#

Name

Description

1

IN

Input Supply Pin. Connect a decoupling capacitor from IN pin to GND.

2

RS

LED Current Sense Input. Connect a current-sense resistor that programs LED average

current to the IN pin.

3

EN/DIM

Enable/Dimming Command Input. A voltage greater than 0.3V turns on the chip. To use

PWM dimming, apply a square wave signal to this pin. If diming-off time is larger than

20ms, the IC shuts down. For analog dimming, the EN/DIM pin voltage rises from 0.3V to

2.7V and LED current will change from 20% to 100% of the maximum LED current.

4

GND

Ground.

5

DR

Gate-Driver Output. Connect this pin to the gate of the external MOSFET.

6

VCC

Internal Regulator Output. Connect a 1μF decoupling cap from this pin to ground.