ncl30160 ON Semiconductor, ncl30160 Datasheet - Page 2

• Manufacturer Part Number: ncl30160
• Description: Constant Current Buck Regulator For Driving High Power Leds
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTION
1, 2
Pin
3
4
5
6
7
8
Pin Name
DIM/EN
GND
VCC
R
VIN
CS
LX
OT
Current Sense feedback pin
Output of Internal 5 V linear
Off−Time Setting Resistor
PWM Dimming Control &
Drain of Internal Power
VIN
Input Voltage Pin
Description
Ground Pin
MOSFET
regulator
ENABLE
C
IN
Figure 1. Typical Application Circuit
R
C
http://onsemi.com
OT
VCC
Set the current through the LED array by connecting a resistor from this pin to
ground.
Ground. Reference point for all voltages
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.
Resistor ROT from this pin to VCC sets the Off−Time range for the hysteretic
controller.
Connect a logic−level PWM signal to this pin to enable/disable the power
MOSFET and LED array
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.
The LX pin connects to the inductor and provides the switching current
necessary to operate in hysteretic mode.
LED
VIN
DIM/Enable
ROT
VCC
…
2
NCL30160
LED
D1
GND
CS
L1
LX
Application Information
R
SENSE