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LT4322

Analog Devices
Part Number LT4322
Manufacturer Analog Devices
Description High-Voltage Active Rectifier Controller
Published Aug 29, 2023
Detailed Description Data Sheet LT4322 Floating, High-Voltage Active Rectifier Controller FEATURES  Replaces Rectifying Diodes with N-Chan...
Datasheet PDF File LT4322 PDF File

LT4322
LT4322

Overview
Data Sheet LT4322 Floating, High-Voltage Active Rectifier Controller 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 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.
022 TEMPERATURE RISE (°C) 112 TYPICAL APPLICATION + LT4322 VDDC CATHODE GATE ANODE VSSA VDDA LT4322 VDDC CATHODE GATE ANODE VSSA VDDA VOUT CLOAD + RLOAD ~ VDDC CATHODE GATE ANODE VSSA VDDA LT4322 INPUT 10Hz TO 100kHz (typ) – ~ VDDC CATHODE GATE ANODE VSSA VDDA LT4322 OUTPUT 9.
5V TO 60V Figure 1.
10Hz to 100kHz, 9.
5V to 60V Full-Bridge Application 100 DIODE MOSFET 8...


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