DESCRIPTION

The LT4322 is a floating active rectifier controller that

drives an external N-Channel MOSFET to replace a

rectifier diode. It is designed primarily for AC

applications and operates with input supply frequencies

ranging from DC to 100kHz. On each cycle of the input

AC waveform, an external N-Channel MOSFET gate is

enhanced to provide the equivalent of a low diode

forward voltage drop of 25mV. The resulting reduction

in power dissipation eliminates thermal design

problems and costly heat sinks, greatly reducing PC

board area.

The addition of a high-voltage depletion N-Channel

MOSFET enables operation at very high output voltages,

limited only by the voltage ratings of two external

MOSFETs. In AC applications, an integrated LDO

provides the required gate drive voltage to turn the

external MOSFET fully on. Fast, high-current gate drivers

minimize reverse current transients at high input frequencies.

FEATURES

? Replaces Rectifying Diodes with N-Channel

MOSFETs in Rectifier Applications

? Maximizes Power Efficiency, Eliminates Thermal

Design Problems

? Low 25mV Forward Voltage Drop

? Wide Operating Voltage Range: 9V to >500V

? Wide Operating Frequency Range: DC to 100kHz

? Regulated 12V GATE Drive for External N-Channel

MOSFET Enhancement

? 8-Lead MSOP and 8-Lead, 3mm x 3mm, Side Wettable

DFN Packages

APPLICATIONS

? Single-Phase, 3-Phase, and 6-Phase Bridge

Rectifiers

? Automotive Alternator Bridge Rectifiers

? Off-Line Active Bridge Rectifier

? 3-Phase Aircraft Power

? High-Voltage DC Diode-OR with Reverse Blocking

LTC4353屬于集成電路（IC） > OR 控制器，理想二極管。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的LTC4353OR 控制器，理想二極管理想二極管控制器也稱(chēng)為 OR-ing 控制器，可用于以?xún)H允許單向電流的方式控制外部通道晶體管（通常為 FET），類(lèi)似于整流二極管，但傳導(dǎo)損耗低得多。在其他應(yīng)用中，它們通常用于在為了冗余和增加電流輸出能力而并行連接的電源中提供逆流保護(hù)。