Linear Technology LTC4231 Demo Manual

DESCRIPTION

DEMO MANUAL DC2161A

LTC4231 Micropower

Hot Swap Controller

Demonstration circuit 2161A showcases the LT C®4231

™

Micropower Hot Swap tion. Included on

Controller in a 12V, 3A applica-

the board are input overvoltage and reverse voltage protection, input voltage dividers for UV and OV detection, an output voltage LED, jumpers to disable UV/OV, manual and remote enable control, and quiescent current measurement. There are turrets provided

are provided on banana jacks. The DC2161A-A version is used to demonstrate the LTC4231-1 which remains off after a current fault, while the DC2161A-B demonstrates the LTC4231-2 which automatically reapplies power after a cool-down period.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2161A

to monitor input voltage, output voltage, output status, quiescent current, several ground connections, timer pin, and control the ON pin. Input, output and return voltages

PERFORMANCE SUMMARY

Table 1

PARAMETER CONDITIONS VALUE

Input Supply Voltage Range Limited by Transient Surge Protector

Nominal Operating Voltage  12V

Overvoltage Lockout Nominal 14.4V

Undervoltage Lockout (Voltage Falling) Nominal 9.6V

Undervoltage Lockout (Voltage Rising) Nominal 10.8V

Output Current Limit  3A

Maximum Load Capacitance  600µF

Timer Expiration Period  2ms

Specifications are at TA = 25°C

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

–24V to +24V

Table 2. Power Input and Output Connections

NOMENCLATURE CONNECTOR DESCRIPTION

VIN 12V J1 12V Input

GND J2 12V Input Return

VOUT 12V, 3A J3 12V Output

GND J4 12V Output Return

Table 3. Test Points

NOMENCLATURE TURRET DESCRIPTION

VIN 12V E1 12V Input Monitor

GND E2, E4,

E6, E8

VOUT 12V, 3A E3 12V Output Monitor

STATUS E5 Status, Open Drain when Output

GND E6 Ground

IQ E7 Quiescent Current Monitor. Use

ON E9 Enable LTC4231 Output. Enables Output

TIMER E10 TIMER Pin

Ground

Enabled

Microammeter at This Point When JP2 Selects MEASURE IQ.

or Selects External Control of Output

dc2161af

1

DEMO MANUAL DC2161A

JUMPERS

DC2161A contains 3 jumpers. A description of each jumper follows.

JP1, UV/OV. This jumper selects whether or not undervolt ageor overvoltage lockout is enabled. When the jumper is in the disable position, a UV or OV condition will not block operation of the Hot Swap Controller. The default is ENABLE.

JP2, IQ. The LTC4231 is a low power device, meaning it draws very little current to perform its function. Any board leakage on the GATE pin caused by board contamination or a defective MOSFET will cause this current to increase. JP2, when in the MEASURE IQ position, facilitates measurement of the quiescent current of the LTC4231 exclusive of the current of other components on the board, such as LED

-

OPERATING PRINCIPLES

The LTC4231 is a Micropower Hot Swap Controller that has a 2.7V to 36V operating range and a –40V to 40V absolute maximum is populated for +12 adjusted for any voltage between 2.7V and 36V by replac-

6, R7, R8, and R9 in the UVL, UVH, and OV divider

ing R string. suggested in the LTC4231 data sheet to minimize current

These values should be selected using guidelines

voltage for the IN pin. This demo circuit

V operation, but it can easily be re-

D2, output coupling capacitor C3, TVS diode D1, capacitor C1, voltage divider R6, R7, R8 and R9, or any leakage on the board. This current is measured via a microammeter connected between turret E7 and GND. If the MEASURE IQ position is selected, verify a microammeter is connected to prevent damage to the board via leakage between V and the gate of the MOSFETs. The default position for JP2 is NORMAL.

JP3, ENABLE. This jumper either enables or disables the output or provides external control of the output. This is provided by the ON pin of the LTC4231. When in the ON position, the 12V V tion, the 12 the ON pin is connected via a 100kΩ resistor from turret E9 to the ON pin of the LTC4231. A logic 1 on this pin will enable the 12V V

drain. The DC2161A is populated with a Si7960DP dual MOSFET with one section used as a pass MOSFET and the other section used for reverse voltage protection. It also has a 15mΩ sense resistor. This combination provides an output current of 3A. Pads are provided on the PCB for external MOSFET and sense resistor connections for other voltages and currents.

V V

OUT

is enabled. When in the OFF posi-

OUT

is disabled. When in the EXT position,

. The default position for JP3 is ON.

OUT

IN

2

dc2161af

QUICK START PROCEDURE

DEMO MANUAL DC2161A

DC2161A is easy to set up to evaluate the performance of the LTC4231.

Connect a power supply capable of delivering greater than

3.5A of current between 10V and 20V to the V

jack J1

IN

with its return lead connected to GND J2. Monitor the input voltage at turrets E1 and E2. Place a voltmeter between turrets E3 and E4. Connect an ammeter between J3 and the test loads. Connect the return lead of the test loads to jack J4. The connections are shown schematically in Figure 1.

The active load should be set to provide a resistive load since the LTC4231 may not start into a constant current load. With the resistive load set at 5.4Ω, vary the input voltage from 9V to 17V and from 17V to 9V to check the UV and OV thresholds.

Set the input voltage to 12V, vary the load resistance, and observe output indicator D2. Determine from the ammeter that the output remains on at 3A (4Ω). The output should turn off at approximately 3.2A.

Reduce the load resistance to below 4Ω and observe an auto reset in the DC2161A-B. In the DC2161A-A, power will have to be removed and then applied to the input to reset the LTC4231.

Remove the resistive load from the output and replace it with a 500µF capacitor. Observe the polarity when con

-

necting the capacitor. Upon application of input voltage,

D2 should illuminate to indicate V

LED

is present. This

OUT

indicates the Hot Swap Controller is capable of starting into a 500µF capacitor.

A

POWER SUPPLY

V

Figure 1. Proper Equipment Measurement Set-Up

V

TEST LOADS

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3

DEMO MANUAL DC2161A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 CAP., X7R, 0.1µF 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

2 0 C2 CAP., 0402 OPT

3 1 C3 CAP., TANT, 100µF 25V, 20%, 7343 AVX, TAJE107M025RNJ

4 1 C4 CAP., X7R, 0.082µF 16V, 10%, 0402 MURATA, GRM155R71C823KA88D

5 1 D1 DIODE, SUPPRESSORS,600W, SMB-DIODE FAIRCHILD SEMI., SMBJ24CA

6 1 D2 LED, GREEN, LED-ROHM-SML-010 ROHM, SML-010FTT86

7 10 E1-E10 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

8 2 JP1, JP2 HEADER, 2mm SINGLE 3POS SULLINS, NRPN031PAEN-RC

9 1 JP3 HEADER, 2mm DOUBLE 3POS SAMTEC, TMM-103-02-L-D

10 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE, 575-4

11 1 Q1 MOSFET, DUAL-CH, 60V, SO8-POWERPAK VISHAY SILICONIX, Si7960DP-T1-GE3

12 1 R1 RES., CHIP, 10, 1/16W, 1%, 0603 VISHAY, CRCW060310R0FKEA

13 1 R2 RES., SENSE, 0.015, 1/4W, 1%, 1206 VISHAY, WSL1206R0150FEA

14 1 R3 RES., CHIP, 10, 1/16W, 1%, 0402 VISHAY, CRCW040210R0FKED

15 0 R4 RES., 0402 OPT

16 1 R5 RES., CHIP, 3.32kΩ, 1/16W, 1%, 0603 VISHAY, CRCW06033K32FKEA

17 1 R6 RES., CHIP, 1.24MΩ, 1/8W, 1%, 0805 VISHAY, CRCW08051M24FKEA

18 1 R7 RES., CHIP, 12.4kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040212K4FKED

19 1 R8 RES., CHIP, 24.9kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040224K9FKED

20 1 R9 RES., CHIP, 75kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040275K0FKED

21 2 R10, R11 RES., CHIP, 100kΩ, 1/16W, 5%, 0402 VISHAY, CRCW

22 3 SHUNTS AS

23

DC2161A-A Additional Demo Board Circuit Components

1 1 DC2161A-GENERAL BOM

2 1 U1 I.C., MICROPOWER HOT SWAP CONTROLLER, MS12 LINEAR TECH., LTC4231IMS-1

DC2161A-B Additional Demo Board Circuit Components

1 1 DC2161A-GENERAL BOM

2 1 U1 I.C., MICROPOWER HOT SWAP CONTROLLER, MS12 LINEAR TECH., LTC4231IMS-2

SHOWN ON ASSY DWG

4 MH1-MH4 STAND-OFF, NYLON 0.25" KEYSTONE, 8831 (SNAP ON)

SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G

0402100KJNED

4

dc2161af

DEMO MANUAL DC2161A

5

4

3

2

1

11

SCHEMATIC DIAGRAM

2

www.linear.com

VOUT

12V, 3A

BOB S.PRODUCTION2 08-06-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

__

Q1B

Si7960DP

Q1A

Si7960DP

R2

J3

E3E3

R5

12.1k

C3

100uF

C3

100uF

+

OUTSENSE

5

6

4

3

1

2

7

8

0.015

1206

1/4W

0.015

1206

1/4W

IN

BOB S.PRODUCTION2 08-06-14

12V, 3A

BOB S.PRODUCTION2 08-06-14

0603R512.1k

0603

25V

7343

R310R3

J4

C2

R4

GATE

10

D2

OPTC2OPT

OPTR4OPT

SOURCE

GNDJ4GND

GREEND2GREEN

STATUSE5STATUS

GNDE6GND

TIMER

E5

E6

E7IQE7

E10

E4E4

2 1

E10

C4

0.082uFC40.082uF

*

11

10

U1

LTC4231

12

1

9

STATUS

UVH5OV

6

TIMER

GNDSW

7

GND

8

ON

3

R9

66.5kR966.5k

GATE

SOURCE

SENSE

IN

UVL

2

4

R6

1.24M

0805R61.24M

0805

IQ

3 2 1

ON

2

ENABLE

135 6

E8

JP2

EXT

4

OFF

GNDE8GND

IQ

NORMAL MEASURE IQ

JP3

HD2X3-079

www.linear.com

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

LTC4231IMS-1/ 2

DEMO CIRCUIT 2161A

TECHNOLOGY

SCHEMATIC

TITLE:

KIM T.

BOB S.

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

DEMO CIRCUIT 2161A

IC NO. REV.

MICROPOWER HOT SWAP CONTROLLER

N/A

SIZE

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SHEET OF

Wednesday, August 06, 2014

DATE:

SCALE = NONE

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

C1

0.1uF

0603C10.1uF

0603

R1100603R110

D D

0603

D1

SMBJ24CA

1 2

E1E1

VIN

12V

J2

J1

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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

E2E2

GNDJ2GND

R7

8.45kR78.45k

R8

23.7kR823.7k

R10

100k

R10

100k

R11

100k

R11

100k

1

SUFFIX

2

UV/OV

132

ENABLE

JP1

DISABLE

HD1X3-079

U1

LTC4231-1

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL CAPACITORS ARE IN MICROFARADS, 0402.

E9ONE9

ON

C C

B B

A A

LTC4231-2

B

A

ASSY

*

2. ALL RESISTORS ARE IN OHM, 0402.

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5

DEMO MANUAL DC2161A

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

Linear Technology Corporation

6

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

dc2161af

LT 1114 • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2014

Mouser Electronics

Authorized Distributor

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