AS3647B Overview
The AS3647/47B is an inductive high efficient DCDC step up converter with two current sinks. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sinks can operate in flash / torch / assist (=video) light modes.
AS3647B Key Features
- High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils
- Stable even in coil current limit
- LED current adjustable up to 1600mA
- Automatic current adjustment for low battery voltage
- PWM operation for lower output current for reliable light output of the LED; running at 31.25kHz to avoid audible noise
- Protection functions: Automatic Flash Timeout timer to protect the LED(s) Overvoltage and undervoltage Protection Overt
- I2C Interface with automatic shutdown
- 5V constant voltage mode operation