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WillSEMI - White LED Driver

Numéro de référence WD3148
Description White LED Driver
Fabricant WillSEMI 
Logo WillSEMI 





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WD3148 fiche technique
WD3148
White LED Driver with PWM Brightness Control
in Tiny Package
WD3148
Http://www.sh-willsemi.com
With a 40-V rated integrated power switch MOSFET,
the WD3148 is a boost converter that drives up to 10
White LEDs in series. The WD3148 operates at
600kHz fixed switching frequency to reduce output
ripple, improve conversion efficiency, and allows for
the use of small external components.
FB 1
COMP 2
GND 3
6 VIN
5 EN
4 LX
The default Full-Scale White LED current is set by an
external sensor resistor with regulated 200mV
feedback voltage, as shown in typical application.
During operation, the LED current can be controlled
using the Pulse Width Modulation (PWM) signal
applied on the EN pin, through which the PWM
Duty-Cycle determines the feedback reference voltage
and then the White LED current. In PWM mode, the
WD3148 does not burst the LED current; therefore, it
does not generate audible noises on the ceramic
output capacitor. For maximum protection, the device
features integrated open LED protection that disables
the WD3148 to prevent the output voltage from
exceeding the absolute maximum ratings during open
LED conditions.
The WD3148 is available in a PCB space saving DFN
2mm x 2mm-6L Package with bottom thermal pad.
Standard product is Pb-free and Halogen-free.
DFN 2mm x 2mm-6L
Pin configuration (Top view)
3148
Y
W
Marking
= Device Code
= Year Code
= Week Code
Order information
Features
2.7V~5.5V Input voltage range
38V Open LED Protection
200mV Reference Voltage
600kHz Switching frequency
Up to 91% Efficiency
PWM Brightness Control
PWM Dimming Duty ranges from 0.3% to 100%
Built-in Soft-Start and Over-Current limit
Device
Package
Shipping
WD3148D-6/TR DFN-2x2-6L 3000/Reel&Tape
Applications
Smart Phones
Tablets
Portable games
Will Semiconductor Ltd.
1 Apr 12, 2016 - Rev. 1.0

PagesPages 17
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