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NCP5050

ON Semiconductor
Part Number NCP5050
Manufacturer ON Semiconductor
Published Sep 16, 2016
Description 4.5 W Flash White LED Boost Driver
Detailed Description NCP5050 4.5 W Flash White LED Boost Driver The NCP5050 is a high powered fixed frequency PWM boost converter optimize...
Datasheet PDF File NCP5050 PDF File

NCP5050
NCP5050


Overview
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 (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 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) 2.
7 to 5.
5 V C1 4.
7 mF 9 PVIN L1 2.
2 mH SW 10 D1 D...


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