Linear Technology LTC4365 Quick setup guide

dc1555cfd

DEMO MANUAL DC1555C

Description

LTC4365/LTC4365-1:

Overvoltage, Undervoltage and

Reverse Supply Protection Controller

Demonstration circuit DC1555C is intended to demon-

strate the performance of the LTC4365 and LTC4365-1

Undervoltage, Overvoltage and Reverse Supply Protection

Controllers.

The LT C

4365/LTC4365-1 protect circuits from input volt-

ages that may be too high, too low or negative. It operates

by controlling the gates of two back-to-back connected

MOSFETs to keep the output in a safe range. The OV and

UV protection levels are adjusted by resistive dividers at

the OV and UV pins. Asserting the SHDN pin disables the

MOSFETs and places the controller in a low-current shut-

down state. The FAULT pin is asserted when the Controller

is in shutdown mode or when the input voltage is outside

of the UV or OV level.

The LTC4365 and LTC4365-1 can withstand DC voltages

between –40V and +60V and have a valid operating range

of 2.5V to 34V.

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

(TA= 25°C)

Regarding the supply protection parameters, the LTC4365

and LTC4365-1 are identical. The only differences are

in the gate fault recovery delay time and the delay from

turn-off to low-power operation. These delays are 36ms

(typ, both) for the LTC4365, while they are 1ms and 0.7ms

respectively for the LTC4365-1.

The DC1555C includes the controller, two back-to-back

connected power MOSFETs, three jumpers and three

LEDs to indicate the input and output voltages and the

FAULT pin signal.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1555C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Board Input Voltage Range –30 30 V

VIN(UVLO) Input Supply Undervoltage Lockout VIN Rising 1.8 2.2 2.4 V

IVIN Input Supply Current SHDN = 0V

SHDN = 2.5V

150

µA

IVIN(R) Reverse Input Supply Current VIN = –40V, VOUT = 0V –1.2 –1.8 mA

ΔVGATE External N-Channel Gate Drive (GATE – VOUT) VIN = VOUT = 5V, IGATE = –1µA

VIN = VOUT = 12V to 34V, IGATE = –1µA

7.4

3.6

8.4

4.2

9.8

IGATE(UP) External N-Channel Gate Pull-Up current GATE = VIN = VOUT = 12V –12 –20 –30 µA

IGATE(FAST) External N-Channel Fast Gate Pull-Down Current Fast Shutdown, GATE = 20V, VIN = VOUT = 12V 31 50 72 mA

IGATE(SLOW) External N-Channel Gentle Gate Pull-Down Current Gentle Shutdown, GATE = 20V, VIN = VOUT = 12V 50 90 150 µA

VUV UV Input Threshold Voltage UV Falling →ΔVGATE = 0V 492.5 500 507.5 mV

VOV OV Input Threshold Voltage OV Rising →ΔVGATE = 0V 492.5 500 507.5 mV

tGATE(FAST) External N-Channel Fast Gate Turn-Off Delay CGATE = 2.2nF, UV or OV Fault 2 4 µs

tFAULT OV, UV Fault Propagation Delay Overdrive = 50mV, VIN = VOUT = 12V 1 2 µs

VSHDN SHDN Input Threshold SHDN Falling to ΔVGATE = 0V 0.4 0.75 1.2 V

dc1555cfd

DEMO MANUAL DC1555C

operating principles

The LTC4365/LTC4365-1 monitors the input rail voltage

and disconnects downstream circuits when the input volt-

age is too low, too high or negative. The LTC4365 provides

accurate overvoltage and undervoltage comparators to

ensure that power is applied to the system only if the input

supply is within the allowable voltage window. Reverse

supply protection circuit automatically isolates the load

from negative input voltages.

During normal operation, a high voltage charge pump

enhances the gate of external N-channel power MOSFETs.

The controller consumes 10µA during shutdown and

125µA while operating.

dc1555cfd

DEMO MANUAL DC1555C

Demonstration circuit 1555C is easy to set up to evaluate

the performance of the LTC4365/LTC4365-1. Refer to

Figures 1a and 1b for proper measurement equipment

setup and follow the procedure below.

Note that the circuit on the DC1555C is optimized for 12V

operation. The Si4214 FET limits overvoltage and reverse

voltageto30Vand–30V,respectively. Refer to the LTC4365

data sheet for applications optimized for other voltages.

Reverse Voltage Test (Figure 1b)

1) Set JP1 to EN.

2) Set JP2 and JP3 to CONNECT LED.

3) Connect a power supply across VIN and GND in a

negative configuration (connect positive rail to GND

and negative rail to VIN).

4) Connect voltmeters at the input and output and am-

meter in series with supply.

5) Ramp VIN down to –30V (referenced to GND).

6) Verify that the output voltage is between 0V and –0.5V,

all LEDs are off, and the input current is <1.8mA. (FET

leakage or other board leakage paths can pull VOUT

slightly negative, but it will be clamped by the internal

protection diode.)

7) Ramp supply back to 0V.

Undervoltage/Overvoltage Test (Figure 1a)

8) Reverse the polarityofpower supplyconnection across

VIN to GND (connect positive rail to VIN and negative

rail to GND).

9) Ramp supply up to 30V and verify green VIN LED, red

FAULT LED, green VOUT LED, and VOUT according to

Table 1 within the various voltage ranges.

10) Ramp supply down from 30V down to 0V and verify

green VIN LED, red FAULT LED, green VOUT LED, and

VOUT according to Table 1.

Table 1

VIN VOUT VIN LED VOUT LED FAULT LED

0V to 5.77V = 0V Off/Dim/On Off On

6.56V to 13.51V = VIN On On Off

15.47V to 30V = 0V On Off On

Jumper Test

11) Remove load and set supply to 9V.

12) Move jumpers and verify LEDs according to Table 2.

Table 2

JP1 JP2/JP3 VIN LED VOUT LED

EN CONNECT LED On On

DIS CONNECT LED On Off

EN Open Off Off

Quick start proceDure

dc1555cfd

DEMO MANUAL DC1555C

Quick start proceDure

Figure 1a. Undervoltage/Overvoltage Measurement

Figure 1b. Reverse Voltage Measurement

dc1555cfd

DEMO MANUAL DC1555C

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

B B

LED DRIVE

VIN VOUT

-30 TO 0V

0V TO 6V

6V TO 15V

15V TO 30V

REVERSE PROTECTED

UV PROTECTED

GATE ON

OV PROTECTED

(UV = 6V)

(OV = 15V)

(LOW CURRENT MOSFET, SMALL PACKAGE OPTION)

BOARD ASSEMBLY

DC1555C-A

LTC4365CTS8

DC1555C-B LTC4365CTS8-1

Apr 15, 2015

2Replaced Q1, LED's & CLD's. Vlad Ostrerov

VIN VOUT

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Vlad Ostrerov

Replaced LED's, Added -B Assembly

- 1

Oct 26, 2015

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Vlad Ostrerov

Replaced LED's, Added -B Assembly

- 1

Oct 26, 2015

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

Vlad Ostrerov

Replaced LED's, Added -B Assembly

- 1

Oct 26, 2015

SIZE

MODIFY DATE:

.VER.ONCI

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

DEMO CIRCUIT 1555C

Oct 26, 2015

HIGH VOLTAGE NFET DRIVER UV, OV AND

N/A

LTC4365CTS8/LTC4365CTS8-1

Vlad O.

REVERSE SUPPLY PROTECTION

SIZE

MODIFY DATE:

.VER.ONCI

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

DEMO CIRCUIT 1555C

Oct 26, 2015

HIGH VOLTAGE NFET DRIVER UV, OV AND

N/A

LTC4365CTS8/LTC4365CTS8-1

Vlad O.

REVERSE SUPPLY PROTECTION

SIZE

MODIFY DATE:

.VER.ONCI

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

DEMO CIRCUIT 1555C

Oct 26, 2015

HIGH VOLTAGE NFET DRIVER UV, OV AND

N/A

LTC4365CTS8/LTC4365CTS8-1

Vlad O.

REVERSE SUPPLY PROTECTION

1000pF

(OPT)

0805

FAULT

VIN

GRN

VOUT

54.9k

SHDN

CLD2

CMJ2000 TR

DFLT20A

(OPT)

GRN

VIN

JP3

CONNECT

LED

OPEN

VOUT

36.5k

(OPT)

BZT52C15T

CLD3

CMJ2000 TR

GND

4.7µF

50V

(OPT)

Q2B

2N7002VC-7-F

(OPT)

D2S2

510k

DFLT40A

(OPT)

JP2

VIN

47µF

35V

(OPT)

JP1

DIS

SHDN

RED

FAULT

Q1B

Si4214DDY-T1-GE3

CLD1

CMJ2000 TR

LTC4365CTS8

VIN

GATE

VOUT

FAULT

GND

SHDN

VOUT

GND

Q1A

Si4214DDY-T1-GE3

Q2A

2N7002VC-7-F

(OPT)

D1 S1

1N4148WT

dc1555cfd

DEMO MANUAL DC1555C

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0416 REV D • 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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC1555C-B DC1555C-A

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