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WD3124DB PDF даташит

Спецификация WD3124DB изготовлена ​​​​«Will Semiconductor» и имеет функцию, называемую «1000mA Buck/Boost Charge Pump Flash LED Driver».

Детали детали

Номер произв WD3124DB
Описание 1000mA Buck/Boost Charge Pump Flash LED Driver
Производители Will Semiconductor
логотип Will Semiconductor логотип 

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WD3124DB Даташит, Описание, Даташиты
WD3124DB
1000mA Buck/Boost
Charge Pump Flash LED Driver
WD3124DB
Http//:www.sh-willsemi.com
Description
The WD3124DB is a current-regulated charge pump
ideal for powering high brightness LEDs for camera
flash applications. The charge pump can be set to
regulate two current levels for FLASH and TORCH
modes.
The WD3124DB automatically switches modes
between step-up and step-down ensuring that LED
current does not depend on the forward voltage. It
switches at 2.2MHz, allowing the use of tiny
components. The supply voltage ranges from 2.7V to
5.5V and is ideally suited for all applications powered
by a single LI-Ion battery cell or three to four NiCd,
NiMH, or Alkaline battery cells.
The WD3124DB also features a very low shutdown
current, an automatic soft-start mode to limit inrush
current, as well as over current, over voltage and
over-Thermal shutdown control.
A low current sense reference voltage (50mV) allows
the use of small 0603 current sensing resistors.
The WD3124DB is available in Green DFN3×3-10L
package and is specified over an ambient temperature
range of -40to +85.
DFN3x3-10L
VIN 1
C1 2
C2 3
FLASH 4
EN 5
GND
10 VOUT
9 PGND
8 SGND
7 FB
6 RSET
Pin configuration (Top view)
WD3124DB
3124DB = Device code
Y = Year code
W = Week code
Marking
Features
● Output Current up to 1000mA
● Up to 95% Efficiency in Torch Mode
● Adjustable FLASH Mode Current
● Automatic Buck/Boost Mode Switchover
● Wide Input Voltage Range: 2.7V to 5.5V
● Minimum External Components: No Inductors
● High Frequency Operation: 2.2MHz
● Low 50mV Reference for Low Loss Sensing
● PWM Dimming Control
● Automatic Soft Start Limits Inrush Current
● Low Ripple and EMI
Will Semiconductor Ltd.
Order Information
Device
WD3124DB-10/TR
Function
Without timeout
Package
Shipping
DFN3x3-10L
3000/Reel&Tape
Applications
Cellphones
PADs
1 Dec, 2014 - Rev. 1.1









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WD3124DB Даташит, Описание, Даташиты
Pin configuration (Top view)
WD3124DB
Pin descriptions
Symbol
VIN
C1
C2
FLASH
EN
RSET
FB
SGND
PGND
VOUT
DFN3x3-10L
1
2
3
4
5
6
7
8
9
10
Descriptions
Input voltage for the charge pump. Decouple with 4.7μF or 10μF ceramic
capacitor close to the pins of the IC.
Positive input for the external flying capacitor. Connect a ceramic 1μF
capacitor close to the pins of the IC.
Negative input for the external flying capacitor. Connect a ceramic 1μF
capacitor close to the pins of the IC.
Logic input to toggle operation between FLASH and TORCH mode. In
TORCH mode FB is regulated to the internal 50mV reference. In FLASH
mode FB reference voltage can be adjusted by changing the resistor from
RSET pin to ground. Choose the external current sense resistor (RSENSE) based
on desired current in TORCH mode and Flash mode.
Shutdown control input. Connect to VIN for normal operation, connect to
ground for shutdown. For normal operation, suggest connecting to VIN only
after the VIN has settled if the VIN ramping up is slow.
Connect a resistor from this pin to ground. When in FLASH mode (FLASH =
High) this resistor sets the current regulation point according to the following:
VFB =(1.38V / RSET)x10.2kΩ
Feedback input for the current control loop. Connect directly to the current
sense resistor.
Internal ground pin. Control circuitry returns current to this pin.
Power ground pin. Flying capacitor current returns through this pin.
Charge Pump Output Voltage. Decouple with an external capacitor. At least
1μF is recommended. If Higher value capacitor is used, output ripple is
smaller.
Will Semiconductor Ltd.
2 Dec, 2014 - Rev. 1.1









No Preview Available !

WD3124DB Даташит, Описание, Даташиты
Typical applications
WD3124DB
Figure1. Single LED flash circuit @ 700mA flash current
Figure 2. Multiple LED flash circuit @1000mA flash current
Figure 3. Two LED flash circuit @ 1000mA flash current
Will Semiconductor Ltd.
3 Dec, 2014 - Rev. 1.1










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Номер в каталогеОписаниеПроизводители
WD3124DA1000mA Buck/Boost Charge Pump Flash LED DriverWillSEMI
WillSEMI
WD3124DB1000mA Buck/Boost Charge Pump Flash LED DriverWill Semiconductor
Will Semiconductor

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