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AMC7111WF Datasheet(PDF) 4 Page - ADDtek Corp |
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AMC7111WF Datasheet(HTML) 4 Page - ADDtek Corp |
4 / 10 page 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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