On Semiconductor NCL30160 Evaluation Board NCL30160GEVB NCL30160GEVB データシート

D1

NCL30160

R

OT

C

IN

VIN

VIN

VCC

CS

LX

L1

C

VCC

R

SENSE

GND

ROT

DIM/Enable

LED

LED

…

1, 2

CS

Current Sense feedback pin

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

ground.

3

GND

Ground Pin

Ground. Reference point for all voltages

4

VCC

Output of Internal 5 V linear

regulator

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

output of a linear regulator which is powered from VIN. A 2 uF ceramic

capacitor is recommended for bypassing and should be placed as close as

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

5

R

OT

Off−Time Setting Resistor

Resistor ROT from this pin to VCC sets the Off−Time range for the hysteretic

controller.

6

DIM/EN

PWM Dimming Control &

ENABLE

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

MOSFET and LED array

7

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 high

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

close as possible to VIN and power ground.

8

LX

Drain of Internal Power

MOSFET

The LX pin connects to the inductor and provides the switching current

necessary to operate in hysteretic mode.