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AAT3119 Datasheet(PDF) 13 Page - Advanced Analogic Technologies |
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AAT3119 Datasheet(HTML) 13 Page - Advanced Analogic Technologies |
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13 / 16 page  Flash LED Driver The AAT3119 can source 250mA for pulsed loads up to 500ms from an input supply as low as 3.3V. This makes the device well suited for low-cost flash LED driver applications in portable products. Typically the 4.5V output version of the AAT3119 should be selected for photo-flash LED applica- tions, as it can maintain better voltage regulation at higher pulsed load current levels (refer to Figure 2). The limitation of this option is that the greatest flash LED forward voltage (VF) that can be driven is 4.5V at the maximum set forward current (IF) for the application. Flash LEDs with forward voltage (VF) levels up to 5.0V can be driven by the AAT3119 5.0V output option. However, the maximum cur- rent for a 500ms pulse will be reduced. Refer to the Typical Characteristics curves for peak output current levels for a given minimum input voltage. The forward current (IF) through the flash LED may be determined with the use of a series ballast resis- tor. The typical forward voltage (VF) for the flash LED in a given application should be derived from the LED manufacturer's datasheet for the desired forward current (IF) of the flash application. Once the forward current has been determined, the flash ballast resistor can be calculated using the follow- ing equation: Where: RF = Flash ballast resistor value in ohms (Ω) VOUT = Regulated charge pump output voltage (typically 4.5V) VF = Flash LED forward voltage at the desired forward current IF = Desired flash LED forward current The flash LED function can be controlled by the AAT3119 enable pin in most applications. The device start-up time into a maximum load is about 200µs, thus eliminating the need for pre-flash con- trol synchronization. R F = (V OUT - VF) I F AAT3119 High Efficiency 2X Charge Pump 3119.2005.08.1.1 13 Figure 1: White LED Driver. AAT3119 IN GND EN OUT COUT C IN 1µF 1µF 1µF C1+ C1- D1 D2 D3 D4 D5 D6 C FLY R B2 R B3 R B4 R B5 R B1 R B6 V BATTERY Enable |
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