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PDF WD3139 Data sheet ( Hoja de datos )

Número de pieza WD3139
Descripción 38V Step-Up White LED Driver
Fabricantes WillSEMI 
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No Preview Available ! WD3139 Hoja de datos, Descripción, Manual

WD3139
High Efficiency, 38V Step-Up White LED Driver
WD3139
Http//:www.sh-willsemi.com
Descriptions
The WD3139 is a constant current, high efficiency LED
driver. Internal MOSFET can drive up to 10 white LEDs
in series with 1.2A current limit and 38V OVP. A
Pulse-Width-Modulation (PWM) signal can be applied
to the EN pin for LED dimming. The device operates at
1MHz fixed switching frequency to reduce output ripple,
improve conversion efficiency, and allows using small
external components.
The WD3139 is available in TSOT-23-6L Package.
Standard product is Pb-free and Halogen-free.
Features
Input voltage range
: 2.7~5.5V
Open LED Protection
: 38V (Typ.)
Reference Voltage
: 200mV (±5%)
Switching frequency
: 1MHz (Typ.)
Efficiency
: Up to 92%
Main switch current limit : 1.2A (Typ.)
PWM Dimming frequency : 5KHz to200KHz
PWM Dimming Duty Cycle : 0.5% ~ 100%
Applications
Smart Phones
Tablets
Portable games
TSOT-23-6L
LX 1
GND 2
6 VIN
5 OVP
FB 3
4 EN
Pin configuration (Top view)
654
B39F
ACYW
123
TSOT-23-6L
B39F = Device code
Y = Year code
W = Week code
Marking
Order information
Device
Package
Shipping
WD3139F-6/TR TSOT-23-6L 3000/Reel&Tape
Will Semiconductor Ltd.
1 May, 2015 - Rev. 1.1

1 page




WD3139 pdf
Typical Characteristics (Ta=25oC, unless otherwise noted)
100 100
WD3139
90 90
80
70 L=10uH 10S LED
VIN=3.2V
60 VIN=3.6V
VIN=4.2V
50 VIN=5.0V
2 4 6 8 10 12 14 16 18 20
Output Current (mA)
Efficiency vs. Output Current
80
70 L=22uH 10S LED
VIN=3.2V
60 VIN=3.6V
VIN=4.2V
50 VIN=5.0V
2 4 6 8 10 12 14 16 18 20
Output Current (mA)
Efficiency vs. Output Current
100 100
90 90
80 80
70 L=10uH 6S2P LED
VIN=3.2V
60 VIN=3.6V
VIN=4.2V
50 VIN=5.0V
4 8 12 16 20 24 28 32 36 40
Output Current (mA)
Efficiency vs. Output Current
70 L=22uH 6S2P LED
VIN=3.2V
60 VIN=3.6V
VIN=4.2V
50 VIN=5.0V
4 8 12 16 20 24 28 32 36 40
Output Current (mA)
Efficiency vs. Output Current
21.0
1.2
20.5
1.1
20.0
10S LED
19.5
VIN=3.2V
VIN=3.6V
VIN=4.2V
19.0
VIN=5.0V
-40 -20 0 20 40 60 80
Temperature (oC)
LED Current vs. Temperature
1.0
VIN=3.2V
0.9 VIN=3.6V
VIN=4.2V
0.8 VIN=5.0V
-40 -20 0 20 40 60 80
Temperature (oC)
Frequency vs. Temperature
Will Semiconductor Ltd.
5 May, 2015 - Rev. 1.1

5 Page





WD3139 arduino
Applications for Driving 3S9P LEDs
The WD3139 can drive different WLEDs topology.
For example, the Figure 2 shows the 6S2P WLEDs
as output load. The total WLEDs current can be set
by the RSET which is equal to following equation.
With VIN>3.4V, The WD3139 could drive maximum
3S9P with total 27 LEDs.
ITotal
=
VREF
RSET
L1 D1
VIN
10μH~22μH WSB5543W
VOUT
CIN
1μF
VIN LX
EN OVP
COUT
1μF/50V
6S2P LEDs
GND
FB
RSET
Figure 2
Boost Inductor Selection
The selection of the inductor affects steady state
operation as well as transient behavior and loop
stability. Inductor values can have ±20% tolerance
with no current bias. When the inductor current
approaches saturation level, its inductance can
decrease 20% to 35% from the 0A value depending
on how the inductor vendor defines saturation
current. Using an inductor with a smaller inductance
value forces discontinuous PWM when the inductor
current ramps down to zero before the end of each
switching cycle. This reduces the boost converter’s
maximum output current, causes large input voltage
ripple and reduces efficiency. Large inductance
value provides much more output current and higher
conversion efficiency. The inductor should have low
core loss at 1MHz and low DCR for better efficiency.
For these reasons, the recommended value of
WD3139
inductor for 10 series WLEDs applications is from
10μH to 22μH. A 22μH inductor with Low DCR
optimized the efficiency for most application while
maintaining low inductor peak to peak ripple.
Input Capacitor Selection
Connect the input capacitance from VIN to the
reference ground plane. Input capacitance reduces
the ac voltage ripple on the input rail by providing a
low-impedance path for the switching current of the
boost converter. The capacitor in the range of 1μF
to 10μF / X7R or X5R is recommended for input
side.
Output Capacitor Selection
The output capacitor is mainly selected to meet the
requirements for the output ripple and loop stability.
This ripple voltage is related to the capacitor’s
capacitance and its equivalent series resistance
(ESR). The recommended minimum capacitor on
Output is 1uF/50V, X5R or X7R ceramic capacitor.
Diode Selection
The rectifier diode supplies current path to the
inductor when the internal MOSFET is off. Use a
schottky with low forward voltage to reduce losses.
The diode should be rated for a reverse blocking
voltage greater than the output voltage used. The
average current rating must be greater than the
maximum load current expected, and the peak
current rating must be greater than the peak
inductor current.
Diode the following requirements:
Low forward voltage
High switching speed : 50ns max.
Reverse voltage
Rated current
: VOUT + VF or more
: IPK or more
Will Semiconductor Ltd.
11 May, 2015 - Rev. 1.1

11 Page







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