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PDF WD3131 Data sheet ( Hoja de datos )
| Número de pieza | WD3131 | |
| Descripción | 26V Step-Up White LED Driver | |
| Fabricantes | WillSEMI | |
| Logotipo |  |
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WD3131
High Efficiency, 26V Step-Up White LED
Driver
WD3131
Http//:www.sh-willsemi.com
Descriptions
The WD3131 is a constant current, high efficiency LED
driver. Internal MOSFET can drive up to 6 white LEDs
in series and 3S13P LEDs with Min. 1.5A current limit
and 26V OVP. A Pulse-Width-Modulation (PWM) signal
can be applied to the EN pin for LED dimming. The
device operates with 1MHz fixed switching frequency
to reduce output ripple, improve conversion efficiency,
and allows use small external components.
The WD3131 is available in SOT-23-6L package.
Standard product is Pb-free and Halogen-free.
SOT-23-6L
Features
Input voltage range
: 3~5.5V
Open LED Protection
: 26V
Reference Voltage
: 200mV (±5%)
Switching frequency
: 1MHz (Typ.)
Efficiency
: Up to 92%
Main switch current limit : 1.5A (Min.)
PWM Dimming frequency : (5KHz to 200KHz)
PWM Dimming Duty
: Min. 4%
Pin configuration (Top view)
654
3131
EAYW
Applications
Smart Phones
Tablets
Portable games
123
3131 = Device Code
EA = Package Code
Y = Year code
W = Week code
Marking
Order information
Device
Package
Shipping
WD3131E-6/TR SOT-23-6L 3000/Reel&Tape
Will Semiconductor Ltd.
1 Nov, 2014 - Rev. 1.0
1 page  
Typical Characteristics (Ta=25oC, unless otherwise noted)
WD3131
100
95
90
85
80
3S13P LEDs
75 L = 10uH
VIN=3.2V
70 VIN=3.6V
65
VIN=4.2V
VIN=5.0V
60
20 40 60 80 100 120 140 160 180 200 220 240 260
Output Current (mA)
Efficiency vs. Output Current
100
95
90
85
80 3S13P LEDs
75 L = 4.7uH
VIN=3.2V
70 VIN=3.6V
VIN=4.2V
65 VIN=5.0V
60
20 40 60 80 100 120 140 160 180 200 220 240 260
Output Current (mA)
Efficiency vs. Output Current
100
95
90
85
80 6S6P LEDs
75 L = 10uH
VIN=3.2V
70 VIN=3.6V
65
VIN=4.2V
VIN=5.0V
60
10 20 30 40 50 60 70 80 90 100 110 120
Output Current (mA)
Efficiency vs. Output Current
100
95
90
85
80 6S6P LEDs
75 L = 4.7uH
VIN=3.2V
70 VIN=3.6V
65
VIN=4.2V
VIN=5.0V
60
10 20 30 40 50 60 70 80 90 100 110 120
Output Current (mA)
Efficiency vs. Output Current
210
208
206
204
202
200
198
196
194
192 3S10P LEDs
190
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
LED Current vs. Supply Voltage
210
208
206
204
202
200
198
196
194
192
190
-40
3S10P LEDs
VIN=3.3V
VIN=4.2V
VIN=5.0V
-20 0 20 40 60 80
Temperature (℃)
LED Current vs. Temperature
Will Semiconductor Ltd.
5 Nov, 2014 - Rev. 1.0
5 Page 
PCB Layout Considerations
A good circuit board layout aids in extracting the
most performance from the WD3131. Poor circuit
layout degrades the output ripple and the
electromagnetic interference (EMI) or electro-
magnetic compatibility (EMC) performance. The
evaluation board layout is optimized for the WD3131.
Use this layout for best performance. If this layout
needs changing, use the following guidelines:
1. Use separate analog and power ground planes.
Connect the sensitive analog circuitry (such as
voltage divider components) to analog ground;
connect the power components (such as input
and output bypass capacitors) to power ground.
Connect the two ground planes together near
the load to reduce the effects of voltage
dropped on circuit board traces. Locate CIN as
close to the VIN pin as possible, and use
separate input bypass capacitors for the
analog.
2. Route the high current path from CIN, through L
to the LX and GND pins as short as possible.
3. Keep high current traces as short and as wide
as possible.
4. The output filter of the boost converter is also
critical for layout. The Diode and Output
capacitors should be placed to minimize the
area of current loop through Output –GND–LX.
5. Avoid routing high impedance traces, such as
Output, near the high current traces and
components or near the Diode node.
6. If high impedance traces are routed near high
current and/or the LX node, place a ground
plane shield between the traces.
7. Place the RSET resistor as close as possible to
FB pin, for the FB is a high impedance input pin
which is susceptible to noise.
WD3131
WD3131 PCB Suggest Layout (Demo)
Will Semiconductor Ltd.
11 Nov, 2014 - Rev. 1.0
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet WD3131.PDF ] | |
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