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Número de pieza WD3124DA
Descripción 1000mA Buck/Boost Charge Pump Flash LED Driver
Fabricantes WillSEMI 
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WD3124DA datasheet

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WD3124DA pdf
WD3124DA
Electronics Characteristics
(Full= -40to +85VIN= 3.6V, CIN = 4.7uF, CF = COUT = 1uF, VEN= VIN, typical values at +25unless
otherwise noted)
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Input Voltage Range
Quiescent Current
VIN 2.7 5.5 V
IQ
VIN=2.7V-5.5V FLASH=GND,
1X Mode ILOAD=100uA
0.3 mA
IQ FLASH = High, 2x mode
2 mA
Shutdown Supply Current
ISHDN
VEN = 0V, VIN=5.5V
1 uA
Feedback
Voltage
reference
VFB
FLASH = VIN, RSET = 68kΩ
FLASH = GND
175 190 205 mV
45 50 55 mV
FB Pin Current
Oscillator Frequency
Charge Pump Equivalent
Resistance (1× mode)
IFB
fOSC
VFB = 0.3V
VIN = 3.6V
1 uA
2.2 MHz
0.5 0.7 Ω
Charge Pump Equivalent
Resistance (2× mode)
EN, FLASH Logic Low
EN, FLASH Logic High
EN, FLASH Pin Current
VOUT Turn-on Time
VEN,FLASH H
VEN,FLASH L
IEN,FLASH
VIN = 3.6V, FB within 90% of
regulation
0.4
1.3
1
250
V
V
uA
us
Thermal Shutdown
Temperature
Maximum Flash ON time
TSHDN
VIN = 3.6V
150
0.8 1.2 1.6
oC
S
Will Semiconductor Ltd.
5 Dec, 2014 - Rev. 1.1

5 Page

WD3124DA arduino
Once the RSENSE resistor has been selected for
Torch mode, the VFB voltage can be selected for
Flash mode using the following equation:
VFB = IOUT × RSENSE (Flash Mode) where IOUT is for
Flash Mode.
Next, the RSET resistor can be selected for Flash
mode using the following equation:
RSET = (1.26V/VFB)x10.2kΩ(Flash Mode)
For an example of 200mA Torch mode and 600mA
Flash mode, the values RSENSE = 0.25Ω, VFB =
150mV (Flash, Mode), and RSET = 86.6kΩ are
calculated. The powerobtained in the Flash mode
WD3124DA
would be:
PFLASH = VFB × IOUT = 150mV × 600mA = 90mW
The typical 0603 surface mount resistor is rated
1/10Watt continuous power and 1/5 Watt pulsed
power, more than enough for this application. For
other applications, the PFLASH power can be
calculated and resistor size selected. The RSENSE
resistor is recommended to be size 0603 for most
applications. The range of typical resistor values
and sizes are shown in below table:
Will Semiconductor Ltd.
10 Dec, 2014 - Rev. 1.1

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