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NCP5050MTTXG

更新时间： 2024-11-23 03:26:07
品牌 Logo 应用领域
安森美 - ONSEMI 驱动器
页数 文件大小 规格书
14页 162K
描述
4.5 W Flash White LED Boost Driver

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NCP5050MTTXG 数据手册

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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  
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  
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.  
http://onsemi.com  
MARKING  
DIAGRAM  
5050  
ALYWG  
G
WDFN10, 3x3, 0.5P  
CASE 522AA-01  
ISSUE A  
A
L
= Assembly Location  
= Wafer Lot  
Y
W
G
= Year  
= Work Week  
= Pb-Free Package  
(Note: Microdot may be in either location)  
Features  
PIN CONNECTIONS  
•ꢀHigh Efficiency Up to 88% for 2 LED (V = 3.5 V by LED) at 200 mA  
F
•ꢀHigh frequency Dimming PWM Control  
PGND  
VS  
1
2
3
4
5
10 SW  
•ꢀMaximum V of 20 V  
out  
9
8
7
6
PVIN  
LCS  
FB  
•ꢀ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  
CTRL  
CM  
PCA  
HCS  
•ꢀSoft Start to Limit Inrush Current  
•ꢀSmall 3x3x0.8 mm WDFN Package  
(Top View)  
•ꢀThese are Pb-Free Devices  
Typical Applications  
•ꢀWhite LED Flash (Camera Phone, Digital Still Camera,  
Personal Media Player)  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 13 of this data sheet.  
•ꢀPortable Flash Lights  
•ꢀMedium Size LCD Backlight (See Application Note AND8294/D for  
Details)  
2.7 to 5.5 V  
D1  
L1  
C2  
C1  
D2  
D6  
2.2 mH  
1 mF  
4.7 mF  
9
5
10  
2
PVIN  
PCA  
SW  
VS  
FB  
L1: TDK VLF5012T-2R2  
D1: ON MBR130LSF  
7
R1  
C1: 4.7 mF 6.3 V 0603  
3
4
2.8 k  
CTRL  
HCM  
TDK C1608X5R0J475M  
C2: 1 mF 25V 0805  
NCP5050  
2.0  
ENABLE  
TDK C2012X5R1E105M  
R3  
R2  
FLASH/  
TORCH  
10.0  
R
LCS  
R
HCS  
Figure 1. Typical Application Circuit  
©ꢀ Semiconductor Components Industries, LLC, 2007  
October, 2007 - Rev. 0  
1
Publication Order Number:  
NCP5050/D  
1234567...14

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