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VS4101 PDF даташит

Спецификация VS4101 изготовлена ​​​​«VSS» и имеет функцию, называемую «White LED Step-Up Converter».

Детали детали

Номер произв VS4101
Описание White LED Step-Up Converter
Производители VSS
логотип VSS логотип 

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VS4101 Даташит, Описание, Даташиты
1 VS4101
White LED Step-Up Converter
General Description
Features
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.
· 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
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VS4101 Даташит, Описание, Даташиты
2
Ordering Information
VS4101
White LED Step-Up Converter
Package Reference
Package Reference
Pin Description
SOT23-6
Pin #
1
2
3
4
5
6
QFN8
Pin#
8
1,5
6
4
3
2
Pin Name
Function
SW
GND
FB
EN
OV
VIN
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.
Connect OV to the output at the top of the LED string.
Input Supply Pin. Must be locally bypassed.
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VS4101 Даташит, Описание, Даташиты
3
Functional Block Diagram
VS4101
White LED Step-Up Converter
Absolute Maximum Ratings
Parameter
Input Voltage
SW Voltage
FB Voltage
EN Voltage
Thermal Resistance (Junction to Atmosphere, no Heat
sink)
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
Symbol
VIN
VSW
VFB
VEN
RθJA
TJ
TSTG
TLEAD
Recommended Operating Range
Parameter
Input Voltage
Operating Temperature
Output Voltage
Symbol
VIN
TOP
VSW
Min
2.5
-40
VIN
Value
-0.3~6
-0.3~35
-0.3~VDD+0.3
-0.3~VDD+0.3
220
150
-55-150
260
Unit
V
V
V
V
/W
Max Unit
6V
85
28 V
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VS4101White LED Step-Up ConverterVSS
VSS

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