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LT4322 数据表(PDF) 1 Page - Analog Devices

部件名 LT4322
功能描述  Floating, High-Voltage Active Rectifier Controller
PDF  29 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

LT4322 数据表(HTML) 1 Page - Analog Devices

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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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