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dc1555bfa

DEMO MANUAL DC1555B

Description

LTC4365: High Voltage

UV, OV and Reverse Supply

Protection Controller

Demonstration circuit DC1555B isintended to demonstrate

the performance of the LTC4365 High Voltage Undervoltage

(UV), Overvoltage (OV) and Reverse Supply Protection

Controller.

The LTC4365 protects circuits from input voltages thatmay

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 LTC4365 in a low-current shutdown state. The FAULT

pin is asserted when the Controller is in shutdown mode 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)

or when the input voltage is outside of the UV or OV level.

The LTC4365 can withstand DC voltages between –40V

and 60V and has a valid operating range of 2.5V to 34V.

The DC1555B includes the LTC4365 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

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

dc1555bfa

DEMO MANUAL DC1555B

operAting principles

The LTC4365 monitors the input rail voltage and discon-

nects downstream circuits when the input voltage 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

Demonstration circuit 1555B is easy to set up to evaluate

the performance of the LTC4365. Refer to Figures 1a and

1b for proper measurement equipment setup and follow

the procedure below.

Note that the circuit on the DC1555B is optimized for 12V

operation; The Si4230 FET limits overvoltage and reverse

voltage to 30V and –30V,respectively. Refer to the LTC4365

data sheet for applications optimized for other voltages.

Reverse Voltage Tests (Figure 1a)

1) Set JP1 to EN.

2) Set JP2 and JP3 to CONNECT LED.

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

conﬁguration (connect positive rail to GND and negative

rail to VIN).

4) Connect voltmeters at the input and output andammeter

in series with supply.

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

6) Verify output voltage is between 0V and –0.5V, all LEDs

are off, and input current is <1.8mA. (FET leakage or

other board leakage paths can pull VOUT slightly nega-

tive, but it will be clamped by the internal protection

diode.)

7) Ramp supply back to 0V.

qUick stArt proceDUre

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 LTC4365 consumes 10µA during shutdown and 125µA

while operating.

Undervoltage/Overvoltage Test (Figure 1b)

8) Reverse the polarity of power supply connection 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.

11) Repeat steps 9 and 10 with 8A load connected across

VOUT and GND.

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

12) Remove load and set supply to 9V.

13) 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

dc1555bfa

DEMO MANUAL DC1555B

0V TO 30V

–

dc1555b F01a

POWER

SUPPLY

0V TO 30V

–LOAD

dc1555b F01b

POWER

SUPPLY

qUick stArt proceDUre

Figure 1a. Reverse Voltage Measurement

Figure 1b. Undervoltage/Overvoltage Measurement

dc1555bfa

DEMO MANUAL DC1555B

pArts list

ITEM QUANTITY REFERENCE DESCRIPTION MANUFACTURERS PART NUMBER

Required Circuit Components

1 3 CLD1, CLD2, CLD3 Current Limiting, Diode, SOD-80 Central Semi. Corporation, CCLM2000

2 0 C1 (OPT) Capacitor, X5R, 4.7µF, 50V, 20%, 1210 Taiyo Yuden, UMK325BJ475MM-T

3 0 C2 (OPT) Capacitor, Alum, 47µF, 35V, 10%, OSCON-CE-6.3 Sanyo, 35CE47AX

4 0 C3 (OPT) Capacitor, X5R, 10µF, 25V, 10%, 1210 Taiyo Yuden, TMK325BJ106KM

5 2 D1, D2 LED, GRN Panasonic, LN1351CTR

6 1 D3 LED, RED Panasonic, LN1251CTR

7 1 D4 Diode, 75V/200mW, SOD-523 Diodes Inc., 1N4148WT

8 0 D5 (OPT) Zener Diode, 15V, SOD-523 Diodes Inc., BZT52C15T #PbF

9 0 D6 (OPT) Zener Diode, 20V, POWERDI-123 Diodes Inc., DFLT20A #PbF

10 0 D7 (OPT) Zener Diode, 40V, POWERDI-123 Diodes Inc., DFLT40A #PbF

11 4 E1, E2, E6, E7 Turret, Testpoint 0.094" Mill Max 2501-2-00-80-00-00-07-0

12 4 E3, E4, E5, E8 Turret, Testpoint 0.063" Mill Max 2308-2-00-80-00-00-07-0

13 3 JP1, JP2, JP3 Headers, Sgl. Row, 3 Pins, 2mm Ctrs. Samtec, TMM-103-02-L-S

14 1 Q1 Dual N-Channel, 30V, SO-8 Vishay, SI4230DY-T1-GE3

15 0 Q2 (OPT) Dual N-Channel, Low Current, SOT-563 Diodes Inc., 2N7002V-7

16 1 R1 (Bal to #1608A) Resistor, Chip, 1M, 0.06W, 1%, 0603 Vishay, CRCW06031M00FKEA

17 1 R2 Resistor, Chip, 54.9k, 0.06W, 1%, 0603 Vishay, CRCW060354K9FKEA

18 1 R3 Resistor, Chip, 36.5k, 0.06W, 1%, 0603 Vishay, CRCW060336K5FKEA

19 1 R4 Resistor, Chip, 510k, 0.06W, 5%, 0603 Vishay, CRCW0603510KJNEA

20 1 U1 IC, Over/Under/RevV/RevI Protection, SC8 Linear Technology Corporation, LTC4365CTS8

21 3 XJP1, XJP2, XJP3 Shunt, 2mm Ctrs. Samtec, 2SN-BK-G

22 4 Stand-Off, Nylon, 0.25" Tall Keystone, 8831(Snap On)

dc1555bfa

DEMO MANUAL DC1555B

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.

scheMAtic DiAgrAM

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C C

B B

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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

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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

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

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

Vlad O.

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SIZE

MODIFY DATE:

IC NO. REV.

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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

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





Vlad O.

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

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

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 



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





VIN



GATE





VOUT



FAULT





GND



SHDN







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







dc1555bfa

DEMO MANUAL DC1555B

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 0413 REV A • 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 direc-

tive 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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