Linear Technology LTC4364HDE-1 Guida rapida alla configurazione

dc2027af

DEMO MANUAL DC2027A

Description

LTC4364HDE-1, 2

12V Surge Stopper

with Ideal Diode

Demonstration circuit 2027A showcases the LT C

4364

surge stopper with ideal diode in a 12V, 1A application.

DC inputs of up to 80V and transients to 250V are limited

to just 28.7V at the output. Sagging and reverse-polarity

inputs of up to –24V are isolated from the output by a

reverse-blocking MOSFET configured as an ideal diode.

Further, the output is protected against backfeeding. The

output may be driven –20V to +30V without circuit damage

or backfeeding into the input.

A4.7μF timer capacitor and robust forward MOSFET

permit the load to operate through ISO-7637-2 load dump

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.

performance summary

waveform5A.Sustainedovervoltageorovercurrent condi-

tions cause the LTC4364 to turn off after a timer delay.

The LTC4364-1 (DC2027A-A) latches off and is reset

by pulling SHDN low for at least 100μs. The LTC4364-2

(DC2027A-B) automatically retries after a three minute

cool down delay. Start-up and retry are inhibited in the

presence of an input overvoltage.

Design files for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Limits Operating

DC Survival

1ms Transient

6.6

–24

12 27

250

Output Voltage Limits Regulation Voltage

DC Backfeed Protection

27.2

–20

28.7 30.3

Output Current Capability Operating

Current Limit

2.125

2.5

2.875

Specifications are at TA= 25°C

Quick start proceDure

DANGER! HIGH VOLTAGE TESTING SHOULD BE

PERFORMED BY QUALIFIED PERSONNEL ONLY.

As a safety precaution at least two people

should be present during high voltage testing.

Board Layout

DC2027A is a 2-layer board. There are planes for input,

output and ground; these are replicated on each layer. The

93mil input and output connection turrets are not swaged

and may be removed for attachment of up to 12 AWG wire.

Banana jacks facilitate bench testing. There are exposed

conductors on the bottom of the board, and any banana

plugs present will protrude through the bottom of the

board. The underlying surface should be nonconductive

and clear of any wire, solder and other conductive debris.

The input plane is designed to have at least 78mil (2mm)

clearance to adjacent conductors. This is adequate for

100VDC standoff andtransients to250V. Spikes andsurges

are withstood by RLED1, QLED1, ROV1, RUV1, R4, Q1 (if

present), D3, M1, RSNUB and CSNUB. These components

are chosen for wide pad spacing, pulse power capability

and voltage stand off, but ultimately limit the maximum

transient input voltage to ≈250V. The time spent above

80V is limited by the pulse power capability of R4.

dc2027af

DEMO MANUAL DC2027A

Quick start proceDure

Figure 1. Remove RVCC and Add Q1 to Withstand Prolonged Inputs of Up to 250V. R4 Is Increased to 270k

OPERATION

DC2027A has been designed for 12V operation with a load

of up to 1A. M1 limits surges, spikes and transients, such

as are commonly encountered in automotive applications.

For positive-going events, the output is regulated at 28.7V.

Spikes of up to 250V are permissible for 1ms, limited by

the pulse capability of R4. The load may continue operating

during positive transients, including load dump, without

interruption.

Reverse inputs of up to –24VDC are blocked from reaching

the load by M2. Beyond –24V, a 400W transient voltage

suppressor, D4, clamps the input. Consult the SMAJ24A

data sheet for specific information about peak current and

time duration for spikes exceeding –24V.

DC2027A-A is fitted with the LTC4364-1. This device

latches off after a sustained overcurrent or overvoltage

fault. Operation is resumed after cycling the supply, or

after pulsing SHDN low for at least 100μs.

DC2027A-B is fitted with the LTC4364-2, which also shuts

off the output in the presence of a sustained fault condi-

tion, but automatically retries after a cool-down delay of

180 seconds. The cool-down delay may be prematurely

interrupted by pulsing SHDN low for at least 100μs.

In both cases, retry is inhibited by the OV pin if the input

is higher than 16.8V, as is start-up.

While a maximum load current of 1A is permitted during

start-up and overvoltage conditions, current limit is set

to 2.5A. This higher current level is permissible during

normal (12V) operation. In short-circuit conditions where

VOUT = 0V, current limit folds back to 1.25A.

The output is protected against backfeeding over a range

of –20V to 30V. If the output is connected to a low imped-

ance source of less voltage than the input, M1 will likely

go into current limit and fault off. If the output is higher

than the input, M2 will block backfeeding. In the case that

the output is higher than the 28.7V regulation voltage, the

timer will run and M1 will fault off.

Optional Components

The pulse power limitations of R4 may be avoided by

adding Q1. Pads are located on the bottom of the board.

Remove RVCC (a0Ω jumper) and increase R4 to 270k

(see Figure 1). Remember that the board spacing is only

78mils, and that this is inadequate for creepage and clear-

ance at 250VDC.

Pads are included on the bottom of the board for optional

outputcapacitorsCOUT3and COUT4,in theevent additional

bypassing is desired.

Through-hole pads are included for adapting DC2027A to

an off-board power stage, as shown in Figure 2.

VCC

LTC4364

dc2027a F01

100nF

100V

PZTA42

RVCC

REMOVED

CMZ5945B

68V

SMAJ24A

ES1G

270k

1206

INPUT

dc2027af

DEMO MANUAL DC2027A

Quick start proceDure

Figure 2. Connections to an Off-Board Power Stage. Remove M1, M2, RSNS, RSNUB

and RESR from Board. Keep Wires Short to Avoid Parasitic Oscillations in M1

Small Turrets

No connection to any of the small turrets is necessary

to make the board operate—the LTC4364 defaults to the

ON state.

SHDN is pulled high internally. If this turret is left open,

the board will turn on when power is applied. Short this

turret to ground to turn off the LTC4364.

F LT is an open-drain output which pulls low after a TMR

interval if there is a sustained input overvoltage, and does

so 94ms before the output shuts down. In overcurrent

there is a brief early warning delay, the exact time of which

depends on the severity of the overload. There is no pull-up

resistor for F LT ; it must be pulled up to an external logic

supply or to the output with an external resistor. F LT can

sink up to 2mA.

ENOUT is an open-drain output which goes high when

the output rises to within 700mV of the VCC pin. ENOUT

is latched and does not pull low again until the LTC4364

output drops below 2.2V. There is no pull-up resistor for

ENOUT; it must be pulled up to an external logic supply

or to the output with an external resistor. ENOUT can sink

up to 2mA.

TMR is made available so that its operation may be ex-

amined easily with an oscilloscope, by way of a 10MΩ

probe. Do not load or short this turret to ground as the

timer function will be defeated and an overload may de-

stroy M1. TMR normally sits at ground, and charges to

1.35V in a fault condition. This turret also finds use for

connecting different values of CTMR: simply remove the

existing CTMR and solder substitutes between the TMR

and GND turrets.

10Ω

dc2027a F02

RESR

COUT

RSNUB

100Ω

HIGH CURRENT

OUTPUT

HIGH CURRENT

12V INPUT

CSNUB

10nF

M2 RSNS

dc2027af

DEMO MANUAL DC2027A

HOW TO OPERATE DC2027A

DANGER! HIGH VOLTAGE TESTING SHOULD BE

PERFORMED BY QUALIFIED PERSONNEL ONLY.

As a safety precaution at least two people

should be present during high voltage testing.

To operate DC2027A, connect a 12V supply to the in-

put and a 1A load to the output, as shown in Figure 3.

The circuit will turn on automatically when power is

applied. Up to –24VDC may be applied to the input with-

out damage to DC2027A or the load. The output may be

backfed with –20V to 30V, without damage to DC2027A

or backfeeding of the input.

The preferred method of coupling a transient to the input

without backfeeding the 12V supply is to simply isolate

the sources with blocking diodes, as shown in Figure 4.

dc2027a F03

1A LOAD

(12Ω)

12V

SUPPLY

Figure 3. Basic Test Setup

Quick start proceDure

dc2027af

DEMO MANUAL DC2027A

dc2027a F04

1A LOAD

(12Ω)

INPUT FROM

SURGE GENERATOR

MUR460

12V

SUPPLY

Figure 4. Simple Means of Coupling Surges, Transients and Spikes

Quick start proceDure

dc2027af

DEMO MANUAL DC2027A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CHG CAP., X7R, 10nF, 100V, 20%, 0805 AVX, 08051C103MAT2A

2 2 COUT1, COUT2 CAP., X7S, 10µF, 50V, 20%, 1210 TDK, C3225X7S1H106M

3 0 COUT3, COUT4 CAP., X7S, 10µF, 50V, 10%, 1210 OPT

4 1 COV CAP., X7R, 1nF, 100V, 20%, 0805 AVX, 08051C102MAT2A

5 1 CSNUB CAP., X5R, 10nF, 500V, 20%, 1812 AVX, 18127C103MAT2A

6 1 CTMR CAP., X5R, 4.7µF, 10V, 10%, 0805 TDK, C2012X5R1A475K

7 2 C1, CUV CAP., X7R, 100nF, 100V, 20%, 0805 AVX, 08051C104MAT2A

8 2 DLED1, DLED4 LED, GREEN J-TYPE, LED-LN1351C-GREEN PANASONIC, LN1351C-TR

9 2 DLED2, DLED5 LED, RED J-TYPE, LED-LN1251C-RED PANASONIC, LN1251C-TR

10 2 D2, DLED3 DIODE, 300V, 250mA, SOD523 DIODES/ZETEX, BAS521-7

11 1 D1 DIODE, ZENER, 68V, 1.5W, SMA-DIODE CENTRAL SEMI., CMZ5945B

12 1 D3 DIODE, RECTIFIER, 400V, 1.0A, SMA-DIODE DIODES INC., ES1G-13-F

13 1 D4 DIODE, TVS, 24V, 400W, SMA-DIODE DIODES INC., SMAJ24A-13-F

14 2 D6, D7 DIODE, DDZ9702S, 15V, 200mW, SOD323 DIODES INC., DDZ9702S-7

15 6 E2, E3, E4, E5, E6, E8 TESTPOINT, TURRET, 0.094 MILL-MAX, 2501-2-00-80-00-00-07-0

16 4 E10, E11, E12, E14 TESTPOINT, TURRET, 0.064 MILL-MAX, 2308-2-00-80-00-00-07-0

17 4 J1, J2, J3, J4 BANANA JACK, NON-INSULATED KEYSTONE, 575-4

18 1 M1 MOSFET, N-CH, 250V, D2-PAK FAIRCHILD, FDB33N25TM

19 1 M2 MOSFET, N-CH, PWR 100V, 7.5A, SO8 FAIRCHILD, FDS3672

20 1 QLED1 TRANSISTOR, NPN, 300V, SOT223 FAIRCHILD, PZTA42

21 1 QLED2 TRANSISTOR, NPN, 40V, SOT-23 DIODES/ZETEX, MMBT3904-7-F

22 0 Q1 TRANSISTOR, PZTA42, NPN, 300V, SOT223 OPT

23 1 RESR RES., SENSE, 0.1, 1/8W, 5%, 0805 NIC, NCST10JR100HTRF

24 3 RUV1, ROV1, RLED1 RES., CHIP, 249k, 1/4W, 1%, 1206 NIC, NRC12F2493TRF

25 1 RLED2 RES., CHIP, 200, 1/8W, 5%, 0805 NIC, NRC10J201TRF

26 2 RLED3, RLED4 RES., CHIP, 3.3k, 1/4W, 5%, 1206 NIC, NRC12J332TRF

27 2 ROV2, R8 RES., CHIP, 21k, 1/8W, 1%, 0805 NIC, NRC10F2102TRF

28 1 RSNS RES., SENSE, 0.02, 1/4W, 5% 1206 NIC, NCST12JR020JTRF

29 1 RSNUB RES., CHIP, 100, 1/2W, 5%, 1210 NIC, NRCP25J101TRF

30 1 RUV2 RES., CHIP, 66.5k, 1/8W, 1%, 0805 NIC, NRC10F6652TRF

31 1 RVCC RES., CHIP, 0, 0805 NIC, NRC10Z0TRF

32 1 R4 RES., CHIP, 2.2k, 1/4W, 5%, 1206 NIC, NRCP12J222TRF

33 1 R5 RES., CHIP, 10, 1/8W, 5%, 0805 NIC, NRC10J100TRF

34 1 R7 RES., CHIP, 453k, 1/8W, 1%, 0805 NIC, NRC10F4533TRF

35 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON 0.5" KEYSTONE, 8833 (SNAP-ON)

36 1 U1 I.C., LTC4364HDE-1, DC2027A-A LINEAR TECHNOLOGY, LTC4364HDE-1

37 1 U1 I.C., LTC4364HDE-2, DC2027A-B LINEAR TECHNOLOGY, LTC4364HDE-2

dc2027af

DEMO MANUAL DC2027A

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

dc2027af

DEMO MANUAL DC2027A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0313 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC2027A-B DC2027A-A

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