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AS3643 - 1300mA High Current LED Flash Driver

General Description

The AS3643 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.

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 1300mA.
  • 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 Overtemperature Pr.

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Datasheet Details

Part number AS3643
Manufacturer austriamicrosystems
File Size 3.47 MB
Description 1300mA High Current LED Flash Driver
Datasheet download datasheet AS3643 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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valid Datasheet AS3643 1300mA High Current LED Flash Driver 1 General Description The AS3643 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. The AS3643 includes flash timeout, overvoltage, overtemperature, undervoltage and LED short circuit protection functions. A TXMASK/TORCH function reduces the flash current in case of parallel operation to the RF power amplifier and avoids a system shutdown. Alternatively this pin can be used to directly operate the torch light directly.