Linear Technology DC2465A Quick setup guide

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dc2465af
DEMO MANUAL DC2465A
Description
LT4320
3-Phase Ideal Diode Bridge
Demonstrationcircuit2465Aisa3-phaseidealdiodebridge
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 RDS(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.
The3-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 TA= 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
VOUT+
VOUT–
+
PHASE 1
PHASE 2
PHASE 3
VOUT+
VOUT–
3×
LT4320
IN1
IN2
TG
BG
DC2465 TA01b

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dc2465af
DEMO MANUAL DC2465A
thermal performance comparison
BoarD photos
Top Side
Conventional 3-Phase Diode Bridge, 48°C Temperature Rise
PDS5100H
3-Phase Ideal Diode Bridge,10°C Temperature Rise
Infineon BSC035N10NS5ATMA1
Bottom Side
Figure 1. Conditions: 24VAC RMS (L-N), 5A Load Current, Without Forced Airflow

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dc2465af
DEMO MANUAL DC2465A
Quick start proceDure
Refer to Figure 2 for proper equipment setup and follow
the procedure below:
1. Verify that the output voltage of the 3-phase AC source
is within the input voltage range of the DC2465A as
shown in Table 1. Turn off the 3-phase AC source. Con-
nect the 3-phase AC source to VIN1, VIN2, and VIN3
as shown in Figure 2.
2. Connect a load and a voltmeter across VOUT+ to VOUT–
as shown in Figure 2. Turn down the load current to
zero. Put the voltmeter in DC volt measurement mode.
3. Raise the output voltage of the 3-phase AC source to
the desired level. Check the output voltage with the
voltmeter.
4. Raise the load current to desired level. Make sure the
load current is within the maximum load current as
shown in Table 1.
Figure 2. Setup Diagram
DC2447 F03
LOAD
+
–
VOLTMETER
+
–
+ –
PHASE 1
+ –
PHASE 2
+ –
PHASE 3
3-PHASE
AC IN
Table 1. Input Voltage and Output Current Specification
Input Voltage Maximum Load Current
5VAC to 28VAC RMS (Line to Neutral)
9VAC to 48VAC RMS (Line to Line)
25A
(Without Forced Airflow or Heat sink)

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dc2465af
DEMO MANUAL DC2465A
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C3, C4 CAP, CER, X7S 1µF 100V 20% 0805 TDK C2012X7S2A105M125AB
2 1 C2 CAP, ELE, 10µF 100V 20% 6.3X6.0 SUNCON 100CE-10KX
3 9 D3, D4, D6, D7, D9, D10,
D11, D12, D13
DIODE, SCHOTTKY, MMSD4148 100V SOD123 FAIRCHILD MMSD4148
4 6 Q1, Q2, Q3, Q4, Q5, Q6 MOSFET, N-CH, BSC035N10NS5ATMA1 100V PG-
TDSON-8
INFINEON BSC035N10NS5ATMA1
5 6 R2, R3, R5, R6, R8, R9 RES, CHIP, 100k 5% 0603 VISHAY CRCW0603100KJNEA
6 3 U1, U2, U3 IC, LT4320IDD-1 LINEAR TECH LT4320IDD-1#PBF
Additional Demo Board Circuit Components
1 1 D1 DIODE, TVS, SMAJ70A 70V SMA LITTELFUSE SMAJ70A
2 3 D2, D5, D8 DIODE, OPT SOD123 OPT
3 1 D14 DIODE, LED ROHM SML-010FTT86L
4 5 E1, E3, E4, E5, E6 CONN, TURRET, MILL-MAX-2501 MILL-MAX 2501
5 7 J1, J2, J3, J4, J5, J6, J7 CONN, BANANA JACK KEYSTONE 575-4
6 3 R1, R4, R7 RES, CHIP, 0Ω SHUNT 0603 VISHAY CRCW06030000Z0EA
7 1 R10 RES, CHIP, 5.1k 5% 2512 VISHAY CRCW25125K10JNEG
8 4 MH1–MH4 STAND-OFF, NYLON 0.50" TALL (SNAP ON) KEYSTONE 8833

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dc2465af
DEMO MANUAL DC2465A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
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VIN2
VIN3
VIN3
VIN1
VIN1
VIN2
VIN1
VIN2
VIN3
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























  

 

  

 

  

 
Q3

Q3

6
4
5
8
7
1
2
3
D12
MMSD4148
D12
MMSD4148
21

E1E1
D4
MMSD4148
D4
MMSD4148
21




BG2
3TG2 2
IN2
1
EP 9
OUTP 6
OUTN 5
BG1
4TG1 7
IN1
8




BG2
3TG2 2
IN2
1
EP 9
OUTP 6
OUTN 5
BG1
4TG1 7
IN1
8
D1
SMAJ70A
D1
SMAJ70A
12
R3
100K
R3
100K
E6E6
D8
OPT
D8
OPT
2 1
C4
1uF
100V
C4
1uF
100V
Q1

Q1

6
4
5
8
7
1
2
3
D3
MMSD4148
D3
MMSD4148
21
J2J2
C1
1uF
100V
C1
1uF
100V
R7
0
R7
0
D13
MMSD4148
D13
MMSD4148
21
R2
100K
R2
100K




BG2
3TG2 2
IN2
1
EP 9
OUTP 6
OUTN 5
BG1
4TG1 7
IN1
8
R9
100K
R9
100K
D11
MMSD4148
D11
MMSD4148
21
E5E5
D5
OPT
D5
OPT
2 1
C3
1uF
100V
C3
1uF
100V
R8
100K
R8
100K
Q6

Q6

6
4
5
8
7
1
2
3

+
C2
10uF
100V
+
C2
10uF
100V
D14
LED
D14
LED
R4
0
R4
0
D10
MMSD4148
D10
MMSD4148
21

D9
MMSD4148
D9
MMSD4148
21
Q2

Q2

6
4
5
8
7
1
2
3
R6
100K
R6
100K
J6J6
E4E4

E3E3
R5
100K
R5
100K
Q4

Q4

6
4
5
8
7
1
2
3
J5J5
D7
MMSD4148
D7
MMSD4148
21

D6
MMSD4148
D6
MMSD4148
21
J4J4
R1
0
R1
0
R10
5.1K
R10
5.1K
Q5

Q5

6
4
5
8
7
1
2
3

D2
OPT
D2
OPT
2 1
J1J1
J3J3
J7J7

6
dc2465af
DEMO MANUAL DC2465A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0416 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation