NCP5050MTTXG【PDF 1/14 页】IC LED DRIVR PHOTO FLASH 10-WDFN

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NCP5050

4.5 W Flash White LED

Boost Driver

The NCP5050 is a high powered fixed frequency PWM boost

converter optimized for constant current applications such as driving

high ? powered white LEDs. This device has been designed with

high ? efficiency for use in portable applications and is capable of

driving up to 5 high power LEDs in series for camera flash or

flashlight (torch) applications. To support the need of driving the

LEDs in a high current pulse mode for flash as well as a continuous

mode for focus or torch, a control pin and support circuitry is

incorporated which allows the user to program two LED currents. The

http://onsemi.com

MARKING

DIAGRAM

both output current are fully configurable via the use of 2 external

resistors and this average current can be reduced by applying a PWM

signal to the CTRL pin up to 50 kHz.

The PWM operates at 1.7 MHz which allows the use of small

WDFN10, 3x3

CASE 522AA

ISSUE A

5050

ALYW G

inductors and ceramic capacitors. In addition the compensation is

internal to the device which simplifies the design and reduces the PCB

component count. To protect the device cycle ? by ? cycle current

limiting and a thermal shutdown circuit have been incorporated as

well as output over ? voltage and time out protection. The maximum

peak current level of the power switch is adjustable to allow further

system optimization. The NCP5050 is housed in a low profile space

efficient 3x3 mm thermally enhanced WDFN.

Features

? High Efficiency Up to 88% for 2 LED (V F = 3.5 V by LED) at 200 mA

? High frequency Dimming PWM Control

? Maximum V out of 20 V

? 1.7 MHz PWM DC/DC Converter

? Shut Down Control Facility with True ? Cutoff

? Open LED (Output Overvoltage) Protection

? 1.2 s Timer out Function

? Soft Start to Limit Inrush Current

? Small 3x3x0.8 mm WDFN Package

? These are Pb ? Free Devices

Typical Applications

? White LED Flash (Camera Phone, Digital Still Camera,

Personal Media Player)

? Portable Flash Lights

? Medium Size LCD Backlight (See Application Note AND8294/D for

Details)

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb ? Free Package

(Note: Microdot may be in either location)

PIN CONNECTIONS

PGND 1 10 SW

VS 2 9 PVIN

CTRL 3 8 LCS

CM 4 7 FB

PCA 5 6 HCS

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 13 of this data sheet.

2.7 to 5.5 V

4.7 m F

PVIN

2.2 m H

1 m F

PCA

L1: TDK VLF5012T ? 2R2

2.8 k

ENABLE

FLASH/

TORCH

CTRL

HCM

NCP5050

2.0

R HCS

R LCS 10.0

D1: ON MBR130LSF

C1: 4.7 m F 6.3 V 0603

TDK C1608X5R0J475M

C2: 1 m F 25V 0805

TDK C2012X5R1E105M

Figure 1. Typical Application Circuit

? Semiconductor Components Industries, LLC, 2010

December, 2010 ? Rev. 1

Publication Order Number:

NCP5050/D

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