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參數(shù)資料
| 型號(hào)： | NCP5050MTTXG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.5 W Flash White LED Boost Driver |
| 中文描述： | 3 A SWITCHING REGULATOR, 1950 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, WDFN-10 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 166K |
| 代理商： | NCP5050MTTXG |
Semiconductor Components Industries, LLC, 2007
October, 2007 - Rev. 0
1
Publication Order Number:
NCP5050/D
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.
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 P hone, Digital Still Camera,
Personal Media Player)
Portable Flash Lights
Medium Size LCD Backlight (See Application Note AND8294/D for
Details)
C1
4.7 F
2.7 to 5.5 V
C2
1 F
D6
2
10.0
2.0
D2
ENABLE
NCP5050
PCA
5
VS
2
L
8
CTRL
HCM
3
4
H
6
FB
7
P
1
PVIN
9
SW
10
R1
2.8 k
L1
2.2 H
D1
L1: TDK VLF5012T-2R2
D1: ON MBR130LSF
C1: 4.7 F 6.3 V 0603
TDK C1608X5R0J475M
C2: 1 F 25V 0805
TDK C2012X5R1E105M
Figure 1. Typical Application Circuit
FLASH/
TORCH
R3
R
LCS
R2
R
HCS
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
ORDERING INFORMATION
MARKING
DIAGRAM
http://onsemi.com
A
L
Y
W
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
(Note: Microdot may be in either location)
5050
ALYW
WDFN10, 3x3, 0.5P
CASE 522AA-01
ISSUE A
1
2
3
4
5
10
9
8
7
6
PGND
VS
CTRL
CM
PCA
SW
PVIN
LCS
FB
HCS
PIN CONNECTIONS
(Top View)
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