Datasheet

ManualsBrandsON SEMICONDUCTOR ManualsDev KitsPCB design board

January, 2012 − Rev. 1

1 Publication Order Number:

NCL30160/D

NCL30160

1.0A Constant-Current

Buck Regulator for Driving

High Power LEDs

The NCL30160 is an NFET hysteretic step−down, constant−current

driver for high power LEDs. Ideal for automotive, industrial and

general lighting applications utilizing minimal external components.

The NCL30160 operates with an input voltage range from 6.3 V to

40 V. The hysteretic control gives good power supply rejection and

fast response during load transients and PWM dimming to LED arrays

of varying number and type. A dedicated PWM input (DIM/EN)

enables wide range of pulsed dimming and a high switching frequency

up to 1.4 MHz allows the use of smaller external components

minimizing space and cost. Protection features include

resistor−programmed constant LED current, shorted LED protection,

under−voltage and thermal shutdown. The NCL30160 is available in a

SOIC−8 package.

Features

• Integrated 1.0A MOSFET

• VIN Range 6.3 V to 40 V

• Short LED Shutdown Protection

• Up to 1.4 MHz Switching Frequency

• No Control Loop Compensation Required

• Adjustable LED Current

• Single Pin Brightness and Enable/Disable Control Using PWM

• Supports All−Ceramic Output Capacitors and Capacitor−less Outputs

• Thermal Shutdown Protection

• Capable of 100% Duty Cycle Operation

• This is a Pb−Free Device

Typical Application

• LED Driver

• Constant Current Source

• Automotive Lighting

• General Illumination

• Industrial Lighting

http://onsemi.com

Device Package Shipping

†

ORDERING INFORMATION

NCL30160DR2G SOIC−8

(Pb−Free)

2500 / Tape & Reel

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

SOIC−8 NB

CASE 751

MARKING DIAGRAM

30160

ALYWX

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

PIN CONNECTIONS

GND

VCC

VIN

ROT

DIM/ENABLE

Summary of content (10 pages)

PAGE 1
NCL30160 1.0A Constant-Current Buck Regulator for Driving High Power LEDs The NCL30160 is an NFET hysteretic step−down, constant−current driver for high power LEDs. Ideal for automotive, industrial and general lighting applications utilizing minimal external components. The NCL30160 operates with an input voltage range from 6.3 V to 40 V. The hysteretic control gives good power supply rejection and fast response during load transients and PWM dimming to LED arrays of varying number and type.
PAGE 2
NCL30160 D1 VIN CIN L1 … LED LED VIN LX DIM/Enable ROT ROT CS NCL30160 VCC CVCC RSENSE GND Figure 1. Typical Application Circuit PIN FUNCTION DESCRIPTION Pin Pin Name Description Application Information 1, 2 CS Current Sense feedback pin Set the current through the LED array by connecting a resistor from this pin to ground.
PAGE 3
NCL30160 MAXIMUM RATINGS Symbol Min Max Unit VIN to GND Rating VIN −0.3 40 V MOSFET Drain Voltage to GND LX − 40 V VCC to GND VCC − 6 V DIM/EN to GND DIM −0.3 6 V CS to GND CS −0.3 6 V ROT −0.3 ROT to GND Absolute Maximum Junction Temperature TJ(MAX) Operating Junction Temperature Range TJ 6 150 −40 V °C 125 °C Maximum LED Drive Current ILIM 1.5 A Storage Temperature Range Tstg −55 to +125 °C PD RqJA 1.11 111.
PAGE 4
NCL30160 ELECTRICAL CHARACTERISTICS (Unless otherwise noted: VIN = 12 V, TA = 25°C, unless otherwise specified.) Symbol Characteristics Min Typ Max Unit 40 V SYSTEM PARAMETERS VIN Input Supply Voltage Range Normal Operation 8.0 Functional (Note 5) 6.3 IQ_IN Quiescent Current into VIN 1.5 mA VCC Internal Regulator Output (Note 6) 5.0 V VUV+ Under−Voltage Lock−out Threshold (VIN Rising) 5.5 6.0 6.5 V VUV− Under−Voltage Lock−out Threshold (VIN Falling) 5.2 5.6 6.
PAGE 5
NCL30160 DIM / Enable VIN VCC 5 V Regulator (6.3 V to 40 Vmax) VCC LX Enable Pull−Up Resistor Gate Driver S Q R Q Peak Current Comparator 220 mV CS Valley Current Timer (toff) & Thermal Shutdown ROT Comparator 180 mV Short Circuit Protection Comparator 500 mV GND Figure 2. Simplified Block Diagram TYPICAL APPLICATION CIRCUITS AND WAVEFORMS (TJ = 25°C, Unless Otherwise Specified) D1 VIN CIN L1 LED LX VIN DIM/Enable ROT PWM ROT CS NCL30160 VCC CVCC RSENSE GND Figure 3.
PAGE 6
NCL30160 Figure 4. Typical Operation Waveforms (VCC = 12 V, VLED = 6.5 V, RSENSE = 0.68 W, L = 100 mH) THEORY OF OPERATION sensed when the FET is turned back on and a correction signal is sent to the off time circuit to adjust the off time as necessary. This switching power supply is comprised of an inverted buck regulator controlled by a current mode, hysteretic control circuit.
PAGE 7
NCL30160 Figure 7. Dimming Waveforms Figure 6. Short-Circuit Protection By applying a pulsed signal to DIM/EN, the average output current can be adjusted to the duty ratio of the pulsed signal. It is recommended to keep the frequency of the DIM/EN signal above 100 Hz to avoid any visible flickering of the LED. When VIN rises above the UVLO threshold voltage, switching operation of the FET will begin.
PAGE 8
NCL30160 t OFF + L DI V LED ) V diode ) I OUT It is also important to select a diode that is capable of withstanding the peak reverse voltage it will see in the application. It is recommended to select a diode with a rated reverse voltage greater than VIN. It is also recommended to use a low-capacitance Schottky diode for better efficiency performance.
PAGE 9
NCL30160 95 95 90 90 EFFICIENCY (%) 100 EFFICIENCY (%) 100 85 80 75 70 65 60 85 80 75 70 65 0 5 10 15 20 25 30 35 60 40 15 20 25 30 35 Figure 10. Efficiency, 700 mA, Vf_LED = 3.5 V 1.65 90 1.60 85 1.55 IQIN (mA) 95 EFFICIENCY (%) 10 Figure 9. Efficiency, 350 mA, Vf_LED = 3.5 V 1.70 80 75 1.45 1.40 65 1.35 5 10 15 20 VIN (V) 25 30 35 1.30 40 40 1.50 70 0 5 VIN (V) 100 60 0 VIN (V) 5 10 15 Figure 11. Efficiency, 1 A, Vf_LED = 3.
PAGE 10
NCL30160 PACKAGE DIMENSIONS SOIC−8 NB CASE 751−07 ISSUE AK −X− NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751−01 THRU 751−06 ARE OBSOLETE. NEW STANDARD IS 751−07. A 8 5 S B 0.