NCL30161

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2

PIN FUNCTION DESCRIPTION

Pin

Pin Name

Description

Application Information

1

CS

Current Sense feedback pin

Set the current through the LED array by connecting a resistor from this pin to

ground.

2, 4, 7

NC

No Connect

3

GND

Ground Pin

Ground. Reference point for all voltages

5

VCC

Output of Internal 5 V linear

regulator

The VCC pin supplies the power to the internal circuitry. The VCC is the out-

put of a linear regulator which is powered from VIN. A 2 mF ceramic capacitor

is recommended for bypassing and should be placed as close as possible to

the VCC and GND pins. Do not connect to an external load.

6

Initial Off−Time Setting

Resistor

Resistor ROT from this pin to VCC sets the initial off−time range for the hys-

teretic controller.

8

DIM/EN

PWM Dimming Control and

ENABLE

Connect a logic−level PWM signal to this pin to enable/disable the power

MOSFET and LED array

9

VIN

Input Voltage Pin

Nominal operating input range is 6.3 V to 40 V. Input supply pin to the internal

circuitry and the positive input to the current sense comparators. Due to high

frequency noise, a 10 mF ceramic capacitor is recommended to be placed as

close as possible to VIN and power ground.

10

GATE

Driver Output

Connect to the gate of the external MOSFET.

11

FLAG

Thermal flag. There is no electrical connection to the IC. Connect to ground

plane.