Linear Technology DC2465A Quick setup guide

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

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

DC2465 TA01b

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

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)

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

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

D D

C C

B B

A A

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VIN2

VIN3

VIN1

VIN2

VIN1

VIN2

VIN3

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







































  



 



  



 



  



 



D12

MMSD4148

D12

MMSD4148



E1E1

MMSD4148









BG2

3TG2 2

IN2

EP 9

OUTP 6

OUTN 5

BG1

4TG1 7

IN1









BG2

3TG2 2

IN2

EP 9

OUTP 6

OUTN 5

BG1

4TG1 7

IN1

SMAJ70A

100K

E6E6

OPT

2 1

1uF

100V

1uF

100V



MMSD4148

J2J2

1uF

100V

1uF

100V

D13

MMSD4148

D13

MMSD4148

100K









BG2

3TG2 2

IN2

EP 9

OUTP 6

OUTN 5

BG1

4TG1 7

IN1

100K

D11

MMSD4148

D11

MMSD4148

E5E5

OPT

2 1

1uF

100V

1uF

100V

100K





10uF

100V

10uF

100V

D14

LED

D14

LED

D10

MMSD4148

D10

MMSD4148



MMSD4148



100K

J6J6

E4E4



E3E3

100K



J5J5

MMSD4148



MMSD4148

J4J4

R10

5.1K

R10

5.1K





OPT

2 1

J1J1

J3J3

J7J7

dc2465af

DEMO MANUAL DC2465A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

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

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