1
dc2465af
DEMO MANUAL DC2465A
Description
LT4320
3-Phase Ideal Diode Bridge
Demonstration circuit 2465A is a 3-phase ideal diode bridge
using three
LT
®
4320
controllers and six N-channel FETs.
This demo board provides highly efficient 3-phase recti-
fication with an input voltage range from 5VAC to 28VAC
RMS (line to neutral) and maximum load current of 25A.
High efficiency 3-phase rectification is achieved by using
six low R
DS(ON)
(3.3mΩ typical) N-channel FETs instead
of the six diodes used in a conventional 3-phase diode
bridge. This solution reduces heat dramatically and eases
performance summary
typical application
thermal design requirements. Furthermore, power lost to
the diodes is available to the application.
The 3-phase ideal diode bridge eliminates a costly heat sink
and active cooling solutions required with a conventional
3-phase diode bridge. Overall solution cost and size can
be dramatically reduced.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2465A
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T
A
= 25°C
3-Phase Diode Bridge
84% Efficiency at 5VAC RMS L-N, 25A
3-Phase Ideal Diode Bridge
97% Efficiency at 5VAC RMS L-N, 25A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
Line to Neutral AC RMS Voltage
Line to Line AC RMS Voltage
5
9
28
48
V
V
Output Voltage
DC Voltage
70
V
Output Current
Without Forced Airflow
25
A
Input Line Frequency
400
Hz
DC2465 TA01a
PHASE 1
PHASE 2
PHASE 3
V
OUT
+
V
OUT
–
+
PHASE 1
PHASE 2
PHASE 3
V
OUT
+
V
OUT
–
3
×
LT4320
IN1
IN2
TG
BG
DC2465 TA01b
