Linear Technology DC1850A-A Quick setup guide

dc1850aabf

DEMO MANUAL

DC1850A-A/DC1850A-B

Description

LTC4366HTS8-1/LTC4366HTS8-2

Very High Voltage Surge Stopper

Demonstration Circuit 1850A showcases the LT C

4366

high voltage surge stopper in a 28V vehicular application.

DC1850A withstands inputs of up to 100VDC and input

transients of up to 250V while maintaining the output at

43.1V. Reverse battery and errant inputs of up to –100VDC

are blocked from reaching the output.

performance summary

DC1850A-A features latchoff behavior after a fault and is

reset by asserting the SHUTDOWN input high for at least

100µs. DC1850A-B features auto-retry 9 seconds after

tripping off in an overvoltage fault condition. The 9 second

delay can be interrupted by pulsing the SHUTDOWN input.

Design files for this circuit board are available at

http://www.linear.com/demo

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.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Range

Operating

DC Survival

1ms Transient

Load = 1.5A

–100

250

100

Output Regulation 41 43.1 45.3 V

Surge Timer

Cool-Down Timer

Input = 100V (DC1850A-B) 1.2

5.9

2.8

4.9

Specifications are at TA= 25°C

dc1850aabf

DEMO MANUAL

DC1850A-A/DC1850A-B

overview

The LTC4366 surge stopper operates in a floating topol-

ogy, permitting the design of circuits capable of operating

at virtually unlimited input voltage. DC1850A has been

designed to protect against ±100VDC and 250V for 1ms,

in 28V vehicle applications. The input start-up range is

18V to 41V, while after start-up the input can fall to ap-

proximately 7V while still passing 1.5A load current.

Careful attention has been paid to the layout to provide at

least 87mil (2.2mm) clearance between input and output,

and input and ground. This wide clearance is capable of

withstanding 100VDC and spikes to 250V without arcing.

The operating ranges are shown in silkscreen on the top

of the board. The bottom shows the U1 part number, top

mark and behavior associated with the –A and –B ver-

sions of DC1850A. This same information is shown on

the schematic.

Three ancillary circuits are located on the bottom of the

board.

Shutdown Level Shifter

Since the LTC4366 operates in a floating topology, it is

necessary to level shift ground-referred shutdown signal-

ling. A simple NPN circuit provides level shifting between

the SHUTDOWN turret and the LTC4366’s SD pin.

Wide Voltage Range Constant Current LED Driver

Making an LED operate at constant brightness over a

wide operating range is made possible by a simple, two-

transistor circuit. Input LED (D6) current is held constant

from 18V to 250V, and emits some light as low as 7V.

Output LED (D5) is biased with a 9.1k resistor (R7, on bot-

tom of board). Its brightness will vary with output voltage.

−100V Reverse Voltage Protection Circuit

Reverse polarity inputs of up to −100V are blocked from

reaching the load by M2, whose associated circuitry is

located on the bottom of the board. This circuit blocks

reverse inputs of up to −250VDC, provided the input is

applied from a cold start. If DC1850A is already on and

operating with a positive input voltage, instantaneous

spikes must not exceed −100V.

SHUTDOWN TURRET

If the SHUTDOWN turret is left open, DC1850A defaults

to the ON state and turns on when an input supply is

connected. Pulling SHUTDOWN to 1.8V or higher causes

the LTC4366 to enter its shutdown state. The circuit

board layout limits the maximum SHUTDOWN voltage to

60VDC, while R2 limits the peak applied transient voltage

capability to 100V.

OPTIONAL COMPONENTS

Tw o optional components, CX and RX are made available

for those who wish to experiment with the frequency

response of the overvoltage regulation loop.

HOW TO OPERATE DC1850A

Operation of DC1850A is straightforward: connect an

input supply of 18V to 41V, and an output load of up to

1.5A. If the SHUTDOWN turret is open circuit the output

will power up. If the input voltage is increased above

≈ 43.1V, the output will limit and shut off after 2.8ms. DC

inputs of up to ±100V may be applied. The basic hookup

is shown in Figure 1.

dc1850aabf

DEMO MANUAL

DC1850A-A/DC1850A-B

overview

Figure 1. DC1850A Basic Hookup

18V TO 41V

INPUT

0A TO 1.5A

LOAD

dc1850aabf

DEMO MANUAL

DC1850A-A/DC1850A-B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 CF CAP., X7R, 1000pF 100V, 10%, 0603 AVX, 06031C102KAT2A

2 2 CT, CG CAP., X7R, 0.01µF 100V, 10%, 0603 AVX, 06031C103KAT2A

3 1 CLOAD CAP., ALUM. 100µF 50V, 20% SUN ELECT, 50CE100LX

4 1 C1 CAP., X7R, 0.47µF 25V, 10%, 0603 AVX, 06033C474KAT2A

5 0 CX (OPT) CAP., X7R, 0.01µF 100V, 10%, 0603

6 1 CSNUB CAP., X7R, 0.01µF 500V, 20%, 1210 AVX, 12107C103MAT2A

7 5 D1, D2, D3, D4, D7 DIODE, SWITCH 300V 400MW SOD123 DIODES INC, BAV3004W-7-F

8 2 D5, D6 LED, GREEN S-GW TYPE SMD PANASONIC, LN1371SGTRP

9 6 E1, E3, E4, E5, E6, E8 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

10 4 E18, E19, E20, E21 JACK, BANANA KEYSTONE, 575-4

11 2 M1, M2 MOSFET, N-CH 250V 33A D2PAK FAIRCHILD, FDB33N25TM

12 3 Q1, Q2, Q3 TRANSISTOR, GP NPN AMP SOT-23 DIODES INC, MMBT3904-7-F

13 1 Q4 TRANS., AMP NPN GP 300V SOT-223 FAIRCHILD, PZTA42 TR

14 1 RFB1 RES., CHIP, 12.4k, 1%, 0603 NIC, NRC06F1242TRF

15 1 RFB2 RES., CHIP, 422k, 1%, 0603 NIC, NRC06F4223TRF

16 1 RG RES., CHIP, 10, 5%, 0603 NIC, NRC06J100TRF

17 1 RSS RES., CHIP, 34k, 1%, 0603 VISHAY, CRCW060334K0FKEA

18 1 RIN RES., CHIP, 392k, 1%, 1206 VISHAY, CRCW1206392KFKEA

19 4 R1, R2, R3, R5 RES., CHIP, 470k, 5%, 0603 NIC, NRC06J474TRF

20 3 R4, R6, R9 RES., CHIP, 270k, 5%, 1206 NIC, NRC12J274TRF

21 1 R7 RES., CHIP, 9.1k, 5%, 1206 NIC, NRC12J912TRF

22 1 R8 RES., CHIP, 4.7k, 5%, 0603 NIC, NRC06J472TRF

23 1 R10 RES., CHIP, 200, 5%, 0603 NIC, NRC06J201TRF

24 0 RX (OPT) RES., CHIP, 100k, 1%, 0603

25 1 RSNUB RES., CHIP,100Ω, 5%, 1210 NIC, NRCP25J101TRF

26 4 STAND OFF STAND OFF 0.375" KEYSTONE, 8832

dc1850aabf

DEMO MANUAL

DC1850A-A/DC1850A-B

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

OUTPUT

1.5A MAXIMUM

CLAMPED AT 43.1V

18V - 41V

-100V REVERSE VOLTAGE

PROTECTION CIRCUIT

WIDE VOLTAGE RANGE

CONSTANT CURRENT

LED DRIVER

INPUT RANGE

DC OPERATING

DC SURVIVAL

18V - 41V

+/- 100V

OUTPUT CLAMP

SURGE TIMER

MAXIMUM LOAD

2.8ms

1.5A

43.1V

INPUT

ASSY

DC1850A-A LTC4366HTS8-1

DC1850A-B

BEHAVIOR

LATCH OFF

AUTO RETRY

LTFMC

LTFMF

PART NUMBER PART MARKING

LTC4366HTS8-2

SHUTDOWN

LEVEL SHIFTER

OUTPUT

INPUT

1ms TRANSIENT 250V

100k

OPT

GND

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Wednesday, June 20, 2012

VERY HIGH VOLTAGE SURGE STOPPER

Mitchell L.

N/A

LTC4366HTS8 FAMILY

DEMO CIRCUIT 1850A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Wednesday, June 20, 2012

VERY HIGH VOLTAGE SURGE STOPPER

Mitchell L.

N/A

LTC4366HTS8 FAMILY

DEMO CIRCUIT 1850A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Wednesday, June 20, 2012

VERY HIGH VOLTAGE SURGE STOPPER

Mitchell L.

N/A

LTC4366HTS8 FAMILY

DEMO CIRCUIT 1850A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Mitchell L.PRODUCTION

36-5-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Mitchell L.PRODUCTION

36-5-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Mitchell L.PRODUCTION

36-5-12

CLOAD

100uF

50V

CLOAD

100uF

50V

BAV3004W

1 2

R4 270kR4 270k

E18E18

E5E5

9.1k

470k

MMBT3904

SHUTDOWN

E21E21

GND

10nF

100V

10nF

100V

RFB1

12.4k

RFB1

12.4k

E19E19

MMBT3904

CSNUB

10nF

500V

CSNUB

10nF

500V E3E3

470k

R2 470kR2 470k

270k

FDB33N25

OPT

GREEN

BAV3004W

1nF

100V

1nF

100V

4.7k

BAV3004W

1 2

R1 470kR1 470k

MMBT3904

E4E4

RIN

392k

RIN

392k

10nF

100V

10nF

100V

RG 10RG 10

RSS

34k

RSS

34k

E20E20

RSNUB

100

RSNUB

100

GREEN

RFB2

422k

RFB2

422k

R10

200

R10

200

FDB33N25

U1U1

VDD

1GATE 8

2OUT 7

FB 6

VSS

4BASE 5

TIMER

PZTA42

3 4

470nF

25V

470nF

25V

BAV3004W

1 2

BAV3004W

10nF

100V

10nF

100V

270k

E6E6

dc1850aabf

DEMO MANUAL

DC1850A-A/DC1850A-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2012

LT 1012 • 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

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