Linear Technology DC2548A Quick setup guide

dc2548af

DEMO MANUAL DC2548A

Description

LT8672

Active Rectifier Controller

with Reverse Protection

Demonstration circuit 2548A is an active rectifier with

reverse protection featuring the LT

8672. The demo

board is designed for 5A load current. The input volt-

age range of the LT8672 is –40V to +42V. Two clamping

diodes, D1 and D2, are used on the board to protect the

IC from overvoltage spikes at the input, thus limiting the

application’s DC input voltage range to –15V and +35V.

The voltage drop on the MOSFET is 20mV in regulation.

The LT8672 can rectify input ripple with an amplitude of

6VP-P and a frequency of up to 50kHz, or with an ampli-

tude of 2VP-P and a frequency of up to 100kHz. High fre-

quency ripple should not be applied at full load current

for more than a few minutes, otherwise C5 may overheat.

JP1 can be used to set the LT8672 in shutdown mode.

It can be turned on by connecting the EN/UVLO to VIN or

VOUT. A digital signal can also be applied at the EN/UVLO

turret to control the part. Due to the presence of the exter-

nal MOSFET’s body diode, the load is not disconnected

from the input if the part is shut down. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog

Devices, Inc. All other trademarks are the property of their respective owners.

performance summary

The PG pin on the demo board can be easily by applying

a voltage source between VEXT and GND. VEXT must not

exceed 5V.

The demo board allows installation of an EMI filter at the

output. To use the EMI filter, install L2, C7, and remove

C5 on the board. In addition, multiple MOSFET footprints

are provided on the backside of the board, making it con-

venient to use other MOSFETs.

The LT8672 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this demo manual

for demo circuit 2548A. The LT8672 is assembled in a

10-lead MSOP package. Proper board layout is essential

for maximum thermal and electrical performance. See the

data sheet sections for details.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2548A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN DC Operating Input Voltage Range –15 35 V

f (AC) Maximum Frequency of AC Input Signal to

BeRectified

VP-P < 6V, CGATE-SOURCE = 10nF 50 kHz

VP-P < 2V, CGATE-SOURCE = 10nF 100 kHz

IOUT Max Output Current VIN=12V 5 A

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dc2548af

DEMO MANUAL DC2548A

performance summary

Figure 1. Rectification of Input Ripple (f = 30kHz, Load = 5A)

10µs/DIV

VBATT

1V/DIV

VOUT

1V/DIV

DC2548 F01

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dc2548af

DEMO MANUAL DC2548A

Quick start proceDure

Demonstration circuit 2548A is easy to set up to evalu-

ate the performance of the LT8672. Refer to Figure 2 for

proper measurement equipment setup and follow the

procedure below:

1. Place JP1 on VOUT or VIN position.

2. Connect the input power supply to VIN and GND.

3. Connect a load from VOUT to GND.

4. Turn on the power at the input.

5. Checkfortheproperoutputvoltages(VOUT= VIN– 2 0 mV).

The demo board provides test points TP1 and TP3 to

accurately measure the voltage across the external

MOSFET.

NOTE. If there is no output, temporarily disconnect the

load to make sure that the load is not shorted.

6. Once the proper output voltage is established, adjust

the load within the operating ranges and observe the

output voltage.

7. To use the PG pin, connect a power source at VEXT

that is not higher than 5V.

8. Test point TP5 allows easy access to the voltage at

the AUX pin. The gate-source voltage can be observed

between TP2 and TP4.

Figure 2. Proper Measurement Equipment Setup

DC2548 F02

–

+–

VOUT

IOUT

IIN

LOAD

–

VIN

+–

POWER

SUPPLY

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dc2548af

DEMO MANUAL DC2548A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., CER., 0.01µF, X7R, 50V, 10%, 0805 MURATA, GRM216R71H103KA01D

2 2 C2, C3 CAP., CER., 1µF, X7R, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

3 1 C4 CAP., CER., 4.7µF, X7R, 50V, 10%, 1210 MURATA, GRM32ER71H475KA88L

4 1 C5 CAP., ALUM., 470µF, 35V, 20% VISHAY, MAL214699006E3

8 1 D1 DIODE, TVS, 15VWM, SMB DIODES INC., SMBJ15A-13-F

9 1 D2 DIODE, TVS, 33VWM, SMB DIODES INC., SMBJ33A-13-F

16 1 L1 IND., 100µH, XPL2010 COILCRAFT, XPL2010-104MLB

18 1 Q1 XSTR., N-CH, 60V, MOSFET, TO252 INFINEON, IPD100N06S403ATMA2

19 1 R1 RES., 1M, 1%, 1/8W, 0805 VISHAY, CRCW08051M00FKEA

20 1 R2 RES., 100k, 1%, 1/8W, 0805 VISHAY, CRCW0805100KFKEA

23 1 U1 I.C., CONTROLLER, 10-MSOP LINEAR TECH., LT8672EMS#PBF

Additional Demo Board Circuit Components

5 0 C6 (OPT) CAP., OPTION, 0805

6 0 C7 (OPT) CAP., ALUM, OPTION, 12.5X16mm

7 0 C8 (OPT) CAP., OPTION, 1206

17 0 L2 (OPT) IND., OPTION, XAL1010

21 0 R3 (OPT) RES., OPTION, 0805

22 0 R4 (OPT) CAP., OPTION, 1206

Hardware: For Demo Board Only

10 7 E1–E7 TEST POINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

11 0 E8 (OPT) TEST POINT, OPTION, TURRET

12 1 JP1 HEADER 3 PIN 0.079 DOUBLE ROW WURTH ELEKTRONIK, 62000621121

13 1 XJP1 SHUNT, 0.079" CENTER WURTH ELEKTRONIK, 60800213421

14 4 J1-J4 CONN., BANANA JACK KEYSTONE, 575-4

15 0 J5 (OPT) CONN., OPTION, BANANA JACK

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dc2548af

DEMO MANUAL DC2548A

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

4 4

3 3

2 2

1 1

1. ALL RESISTORS ARE 0805.

ALL CAPACITORS ARE 0805.

NOTE: UNLESS OTHERWISE SPECIFIED

OPTIONAL

VEMI

SEE DEMO MANUAL

VIN VOUT

VIN

VOUT

GND

1uF

50V

LT8672EMS

SOURCE

PGND

AUXSW

EN/UVLO

DRAIN

GND

GATE

AUX

GND

TP1

J4 GND

TP4

JP1

EN/UVLO

1 2

3 4

5 6

OPT

470uF

35V

MAL214699006E3

100k

OPT

1206

10nF

50V

TP6

1uF

50V

SMBJ33A

2 1

4.7uF

50V

1210

VOUT

IPD100N06S4-03

VOUT

OPT

XAL1010-222ME

GND

EN/UVLO

TP2

VIN TP3

GND

VIN

TP8

100uH

XPL2010-104ML

SMBJ15A

TP5

OPT

1206

VEXT

GND

OPT

TP7

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dc2548af

DEMO MANUAL DC2548A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0917 • 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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