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WD3131 Schematic ( PDF Datasheet ) - WillSEMI

Teilenummer WD3131
Beschreibung 26V Step-Up White LED Driver
Hersteller WillSEMI
Logo WillSEMI Logo 




Gesamt 14 Seiten
WD3131 Datasheet, Funktion
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






WD3131 Datasheet, Funktion
35
30
25
20
15
3S13P LEDs
PWM = 100KHz
10 VIN=3.2V
VIN=3.6V
5 VIN=4.2V
VIN=5.0V
0
1 2 3 4 5 6 7 8 9 10
Duty (%)
LED Current vs. PWM Duty
WD3131
300
270
240
210
180
150 3S13P LEDs
120 PWM = 100KHz
90 VIN=3.3V
60
VIN=3.6V
VIN=4.2V
30 VIN=5.0V
0
10 20 30 40 50 60 70 80 90 100
Duty (%)
LED Current vs. PWM Duty
1.2
1.1
1.0
0.9
0.8
0.7
0.6 Enable threshold High
Enable threshold Low
0.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Supply Voltage (V)
Enable Threshold Voltage vs. Supply Voltage
3.2
2.8
2.4
2.0
1.6
1.2
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Supply Voltage (V)
Supply Current vs. Supply Voltage
320
310
300
290
280
270
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Supply Current (V)
Quiescent Current vs. Supply Voltage
1200
1150
1100
1050
1000
950
900
850
800
3.0 3.5 4.0 4.5 5.0
Supply Voltage (V)
Frequency vs. Supply Voltage
5.5
Will Semiconductor Ltd.
6 Nov, 2014 - Rev. 1.0

6 Page









WD3131 pdf, datenblatt
Typical applications Circuits
WD3131
1. Multiple Strings of 3-Series LED Load
Recommendation:
L1: 10μH, saturation current > 1.5A
RSET
2. Multiple Strings of 4-Series LED Load
Recommendation:
L1: 10μH, saturation current > 1.5A
Will Semiconductor Ltd.
12 Nov, 2014 - Rev. 1.0

12 Page





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