Data Sheet

LT4322

analog.com

Rev. 0

12 of 29

Figure 20. Four-Diode, High-Voltage Full-Bridge Application, 120VRMS, 60Hz

APPLICATIONS INFORMATION

Electronic systems that receive power from an AC power source often employ half-wave rectifier, full-wave rectifier,

or full bridge circuits to convert an AC input current to a DC output current. High-availability systems employ parallel-

connected DC power supplies or battery feeds to achieve redundancy and enhance system reliability. Schottky

diodes are often used in these AC and DC applications. The chief disadvantage of Schottky and rectifier diodes is their

significant forward voltage drop and resulting power and efficiency loss. The LT4322 solves these problems by using

an N-Channel MOSFET as a low-loss pass element to emulate the behavior of a diode. Figure 21 shows the LT4322 in

a half-wave rectifier application.

AC1

VOUT

VTG1

VTG2

VBG1

VBG2

AC2

M1

CVDDA1

22µF

M2

CVDDA2

22µF

M3

CVDDA3

22µF

M4

CVDDA4

22µF

COUT

220µF

CG1

10nF

CG4

10nF

CG3

10nF

CG2

10nF

MBLK1

DN3135

MBLK2

DN3135

MBLK3

DN3135

MBLK4

DN3135

CVDDC1

0.1µF

CVDDC2

0.1µF

D1

D2

GATE CATHODE

VSSA

VDDA

VDDC

ANODE

LT4322

120VRMS

AC

60Hz

GATE

CATHODE

VSSA

VDDA

VDDC

ANODE

LT4322

GATE

CATHODE

VSSA

VDDA

VDDC

ANODE

LT4322

GATE

CATHODE

VSSA

VDDA

VDDC

ANODE

LT4322

+

–

BSC320N20NS3G ATMA1

BSC320N20NS3G ATMA1

BSC320N20NS3G ATMA1

BSC320N20NS3G ATMA1

0.5A

LOAD

TOP1

BOT1

BOT2

TOP2

DC-DC

CONVERTER

15V

VIN

+

GND