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LTC4359 Datasheet(PDF) 1 Page - Analog Devices |
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LTC4359 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 29 page  Data Sheet LT4322 Floating, High-Voltage Active Rectifier Controller Rev. 0 DOCUMENT FEEDBACK TECHNICAL SUPPORT One Analog Wa y, Wilmington, MA 01887 - 2356, U.S.A. T el: 781.329.4700 © 2023 Analog D evic es, Inc. Al l rig hts r eser ved. 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. TYPICAL APPLICATION Figure 1. 10Hz to 100kHz, 9.5V to 60V Full-Bridge Application Figure 2. Temperature Rise vs. Device Current CLOAD RLOAD VDDC CATHODE GATE ANODE VSSA VDDA VDDC CATHODE GATE ANODE VSSA VDDA VDDC CATHODE GATE ANODE VSSA VDDA VDDC CATHODE GATE ANODE VSSA VDDA LT4322 LT4322 LT4322 LT4322 OUTPUT 9.5V TO 60V INPUT 10Hz TO 100kHz (typ) ~ ~ VOUT + – + DIODE MOSFET DEVICE CURRENT (A) 0 2 4 6 8 10 0 20 40 60 80 100 |
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