A8740集成電路（IC）的LED驅(qū)動(dòng)器規(guī)格書PDF中文資料

A8740屬于集成電路（IC）的LED驅(qū)動(dòng)器。由Allegro MicroSystems制造生產(chǎn)的A8740LED 驅(qū)動(dòng)器器件屬于 LED 驅(qū)動(dòng)器電源管理集成電路 (PMIC) 系列，可通過標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪?duì)器件工作點(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。

Description

The Allegro?A8740 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. This has the additional benefit of reducing leakage currents on the secondary side of the transformer. To extend battery life, the A8740 features very low supply current draw (0.5 μA max in shutdown mode). The IGBT driver also has internal gate resistors for minimum external component count. The charge and trigger voltage logic thresholds are set at 1.3 VHI(min) to support applications implementing low-voltage control logic.

Features and Benefits

? Ultra small 2 × 2 DFN/MLP-8 package

? Low quiescent current draw (0.5 μA max. in shutdown mode)

? Primary-side output voltage sensing; no resistor divider required

? Fixed 1.5 A peak current limit

? 1.3 V logic (VHI(min)) compatibility

? Integrated IGBT driver with internal gate resistors

? Optimized for mobile phone, 1-cell Li+ battery applications

? Zero-voltage switching for lower loss

? >75 efficiency

? Charge complete indication

? Integrated 50 V DMOS switch with self-clamping protection