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  ON Semiconductor Electronic Components Datasheet  

NCP5050 Datasheet

4.5 W Flash White LED Boost Driver

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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
highpowered white LEDs. This device has been designed with
highefficiency 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 cyclebycycle current
limiting and a thermal shutdown circuit have been incorporated as
well as output overvoltage 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 (VF = 3.5 V by LED) at 200 mA
High frequency Dimming PWM Control
Maximum Vout of 20 V
1.7 MHz PWM DC/DC Converter
Shut Down Control Facility with TrueCutoff
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 PbFree 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)
2.7 to 5.5 V
C1
4.7 mF
9 PVIN
L1
2.2 mH
SW 10
D1
D2
C2
1 mF
R1
2.8 k
ENABLE
FLASH/
TORCH
5 PCA
3
4
CTRL
HCM
NCP5050
2.0 R2
RHCS
VS 2
FB 7
R3
RLCS 10.0
L1: TDK VLF5012T2R2
D6
D1: ON MBR130LSF
C1: 4.7 mF 6.3 V 0603
TDK C1608X5R0J475M
C2: 1 mF 25V 0805
TDK C2012X5R1E105M
Figure 1. Typical Application Circuit
http://onsemi.com
MARKING
DIAGRAM
WDFN10, 3x3
CASE 522AA
ISSUE A
5050
ALYWG
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
PGND 1
VS 2
CTRL 3
CM 4
PCA 5
10 SW
9 PVIN
8 LCS
7 FB
6 HCS
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
December, 2010 Rev. 1
1
Publication Order Number:
NCP5050/D


  ON Semiconductor Electronic Components Datasheet  

NCP5050 Datasheet

4.5 W Flash White LED Boost Driver

No Preview Available !

PCA
5
R1
2.8k
CTRL
3
ENABLE
NCP5050
90
80
70
60
Vout = 2 LEDs
(7.0 V @ 350 mA)
50
40
30
20
10
0 Vin = 3.7 V
10 100 1000
Iout (mA)
Figure 2. Typical Efficiency
2.7 to 5.5 V
C1
4.7 mF 0603
6.3 V
Cin
PVIN
9
OSC Thermal
1.7MHz Shut down
2.7 mH
L1
OVP
PWM CONTROLLER
D1
1 mF 0805 25V Up to 20 V / 4.5 W
SW
10
C2
Cout
D2
2 VS
FB
7
D6
Band Gap
250k
FLASH/TORCH
4
CM
6
HCS
2.0
R2
RHCS
8
LCS
1 PGND
R3 10.0
RLCS
Figure 3. Simplified Block Diagram
http://onsemi.com
2


Part Number NCP5050
Description 4.5 W Flash White LED Boost Driver
Maker ON Semiconductor
Total Page 14 Pages
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