Allegro MicroSystems A8436
The A8436 is a highly integrated IC that charges photoflash capacitors for digital and film cameras. It also features an integrated IGBT driver that facilitates the flash discharge function and saves board space. To charge the photoflash capacitor, the A8436 integrates a 40 V, DMOS switch that drives the transformer in a flyback topology, allowing optimized design with tight coupling and high efficiency.| Part No. | A8436 |
|---|---|
| Datasheet | A8436 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | Photoflash Capacitor Charger |
| Buy | Stock & Price |
FEATURES AND BENEFITS
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● Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage >75% efficiency Three levels of switch current limit: 1.0, 1.2, 1.4 A Fast charge time Charge complete indication Integrated IGBT driver with trigger No primary-side Schottky diode needed Low-profile package (0.75 mm nominal height)
DESCRIPTION
A proprietary control scheme optimizes the capacitor charging time. Low quiescent current and low shutdown current further improve system efficiency and extend battery life. Three levels of switch current limit are provided: 1.0, 1.2, and 1.4 A. The level is determined by configuring the ILIM pin as grounded, floating, or pulled up to IC supply voltage, respectively. The CHARGE pin enables the A8436 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8436 stops the charging until the CHARGE pin is toggled again. Pulling the CHARGE pin low stops charging. The D ¯ ¯O ¯ ¯N ¯ ¯E ¯ ¯ pin is an open-drain indicator of when the designated output voltage is reached.
