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AS3642 - Ultra Small 500mA Inductive White LED Flash Driver

General Description

The AS3642 is an inductive high efficient DCDC step up converter driving a current source.

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

  • Total flash driver solution only 11mm2.
  • High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils.
  • LED currents Up to 500mA flash current (15.6mA steps) Up to 320mA torch current (10mA steps) 1.35mA,2.9mA,4.4mA or 6mA indicator light current (PWM with 14/32 duty cycle).
  • Flash LED(s) cathode connected to ground: Improved thermal performance (ground = heat sink) Simplified PCB layout.
  • Adjustable Flash Timer 30ms to 480ms in 30ms steps.

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Datasheet Details

Part number AS3642
Manufacturer austriamicrosystems
File Size 1.55 MB
Description Ultra Small 500mA Inductive White LED Flash Driver
Datasheet download datasheet AS3642 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 AS3642 Ultra Small 500mA Inductive White LED Flash Driver 1 General Description The AS3642 is an inductive high efficient DCDC step up converter driving a current source. 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 current source operates in flash/torch/assist (video/autofocus) and indicator mode. The AS3642 includes flash timer, overvoltage, overtemperature, undervoltage and LED short circuit protection functions. The AS3642 is able to detect a broken coil. Together with the LED short and open detection the AS3642 can be used to verify the connection to its external components and allowing in-circuit test.