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AMC7111WF Datasheet(PDF) 4 Page - ADDtek Corp

No. de pieza AMC7111WF
Descripción Electrónicos  WHITE/BLUE LED DRIVER FOR LI-ION BATTERY APPLICATION
Download  10 Pages
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Fabricante Electrónico  ADDTEK [ADDtek Corp]
Página de inicio  https://www.addmtek.com
Logo ADDTEK - ADDtek Corp

AMC7111WF Datasheet(HTML) 4 Page - ADDtek Corp

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AMC7110/1/3/4
Copyright
© 2007 ADDtek Corp.
4
DD028_F
--
JUNE 2007
APPLICATION INFORMATION
Enable
The EN pin enables and disables the device. Pulling the EN pin high will enable the device beginning sink
current on LED pins. Pulling the EN pin to ground will shutdown the device reducing the IDD current to typical 0.1uA.
This pin should not be left floating and need to be terminated.
LED Brightness Control
The LED sink current was fixed at 20mA or 15mA. Apply PWM signal to EN pin and control the duty that could
control the LED brightness from 0% to maximum.
Li-Ion
Battery
EN
VDD
GND
LED2
LED1
LED4
PWM Signal
CBP
Supply Voltage and Li-ion battery low warning
AMC711X works with supply voltage range from 2.7V to 6V. The white/blue LED forward voltage is in the range
of 2.9V to 3.5V at 20mA current. The supply voltage range and LED forward voltage (Vf) should be set to fully ultilize
Li-ion battery energy. For example, the maximum white LED forward voltage limit at 3.2V (@ 20mA) when Li-ion
battery discharg reaches 3.275V( normally around 1% ~ 3% power left in the battery). When Li-ion battery voltage is
lower than the presetted low level, the LED current(brightness) will start to decrease.
Efficiency
The ACR (Advanced Current Regulator) architecture offers ultra low output dropout that significantly improves
the efficiency compared to Inductive Boost type or Capacitor Charge Pump type LED driver. The system efficiency,
defined as the ratio between the LEDs power and the input supplied power, is:
Efficiency = (Vf1 x ILED1 + Vf2 x ILED2 + Vf3 x ILED3 + Vf4 x ILED4) / (VDD x IDD)
Where, Vf is the forward voltage of LED.


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