Linear Technology LT4320IDD Demo Board: 1.2kW Ideal Diode Bridge Full-Wave Rectifier [9V to 40V, 30A] DC1823A DC1823A Data Sheet
Product codes
DC1823A
LT4320/LT4320-1
6
4320fb
operation
Electronic systems that receive power from an AC power
source or a DC polarity-agnostic power source often em-
ploy a 4-diode rectifier. The traditional diode bridge comes
with an efficiency loss due to the voltage drop generated
across two conducting diodes. The voltage drop reduces
the available supply voltage and dissipates significant
power especially in low voltage applications.
By maximizing available voltage and reducing power dis-
By maximizing available voltage and reducing power dis-
sipation, the ideal diode bridge simplifies power supply
design and reduces power supply cost. An ideal diode
bridge also eliminates thermal design problems, costly
heat sinks, and greatly reduces PC board area.
The LT4320 is designed for DC to 60Hz typical voltage
The LT4320 is designed for DC to 60Hz typical voltage
rectification, while the LT4320-1 is designed for DC to
600Hz typical voltage rectification. Higher frequencies of
operation are possible depending on MOSFET size and
operating load current.
Figure 2 presents sample waveforms illustrating the gate
Figure 2 presents sample waveforms illustrating the gate
pins in an AC voltage rectification design.
TG2
IN1
C
LOAD
TO LOAD
INPUT
LT4320
IN2
+
–
~
~
OUTP
OUTN
BG2
TG1
MTG1
MTG2
MBG2
MBG1
BG1
4320 F01
40V
30V
20V
10V
0V
4320 F02
V
TG1
V
TG2
V
BG1
V
BG2
V
IN1
V
OUTP
V
IN2
Figure 1. LT4320 with Four N-Channel MOSFETS, Illustrating Current
Flow When IN1 Is Positive
Figure 2. 24V AC Sample Waveform