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VS4101

VSS
Part Number VS4101
Manufacturer VSS
Description White LED Step-Up Converter
Published Jan 31, 2014
Detailed Description 1 VS4101 White LED Step-Up Converter General Description The VS4101 is a step-up DC/DC converter designed for driving ...
Datasheet PDF File VS4101 PDF File

VS4101
VS4101

Overview
1 VS4101 White LED Step-Up Converter General Description The VS4101 is a step-up DC/DC converter designed for driving up to 8 white LEDs in series from a single cell Lithium Ion battery with constant current.
Because it directly regulates output current, the VS4101 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals.
A single external resistor sets LED current between 5mA and 20mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal.
Its low 104mV feedback voltage reduces power loss and improves efficiency.
The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition.
The PT4101 is available in SOT23-6 and QFN8 packages.
Features · Driver Up to 5 series White LEDs from 2.
5V · Driver Up to 8 series White LEDs from 3.
6V · Up to 87% Efficiency · Over 1.
2MHz Fixed Switching Frequency · Low 104mV Feedback Voltage · Open Load Shutdown · Soft-Start/PWM Dimming · Internal Current Limit · SOT23-6 and QFN8 Packages Applications · Cellular Phones · Digital Cameras · LCD modules · PDAs, Handheld Computers Typical Application Figure 1.
Li-Ion Driver for Six White LEDs Gure 2.
Efficiency vs Number of LEDs Free Datasheet http://www.
datasheet4u.
com/ 2 VS4101 White LED Step-Up Converter Ordering Information Package Reference Package Reference Pin Description SOT23-6 Pin # QFN8 Pin# Pin Name SW GND FB Power Switch Output.
Ground Feedback Input.
Regulator On/Off Control Input.
A high input at EN turns on the converter, and a low input turns it off.
When not used, connect EN to the input source for automatic startup.
The EN pin cannot be left floating.
Over Voltage Input.
OV measures the output voltage for open circuit protection.
Function 1 2 3 4 8 1,5 6 4 EN 5 6 3 2 OV VIN Connect OV to the output at the top of the LED string.
I...


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