Linear Technology DC2160A Guida rapida alla configurazione

dc2160af

DEMO MANUAL DC2160A

DESCRIPTION

LTC4419

18V Dual Input Micropower

PowerPath™ Prioritizer

Demonstration circuit 2160A uses the LTC

4419 to

providebackup switchover, keeping the output load

powered during brown out or power loss conditions.

Priority is assigned by supply connection to the V1 and

V2 inputs. The power source connected to V1 has a higher

priority and is monitored by undervoltage switchover

threshold comparator CADJ (pin ADJ). If V1 exceeds

1.55V and ADJ is above 1.097V for 64ms, V1 is considered

valid, and the LTC4419 connects V1 to the load. If V1

drops below 1.52V, or ADJ drops below 1.047V, V1 is

considered invalid, and the LTC4419 powers the load

from V2. The DC2160A is populated to provide switchover

when V1 drops below 10.19V±0.33V. The upper limit for

V1 is the maximum operating voltage, 18V; however, the

recommended V1 voltage is 12V. The resistive divider (R1-

R2) of the first auxiliary comparator CMP1 is adjusted to

trigger the comparator when VCMP1_TOP’s voltage is in

the 9.92V to 10.74V range. Practically, any voltage from

the operating range can be selected for V2, however, 5V

is recommended to have a standard voltage level.

L, LT, LTC, LTM, Linear Technology, and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

The second auxiliary comparator CMP2 divider (R8-R7) is

adjusted to trigger the comparator when VCMP2_TOP’s

voltage is in the 3.26V to 3.53V range. Overcurrent (0.5A

to 1.6A) and thermal protection inherent to the LTC4419

allows safe prioritization. Overtemperature protection is

activated when the junction temperature exceeds 125ºC.

Another inherent feature – reverse supply protection –

protects the prioritizer and load when a negative voltage

(up to –15V) is applied to any input – V1 or V2.

The LTC4419’s “break-before-make” switching method

prevents cross conduction between input channels. The

LTC4419 does not connect any input source to the load

until the input voltage exceeds the output by 50mV. This

eliminates reverse current fromtheoutput intotheselected

input supply.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2160A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V1, V2, VOUT V1, V2, VOUT Operating Supply Range 1.8 18 V

RON Switch Resistance V1 = V2 = 5V, IOUT = –100μA 1 2 5 Ω

tVALID(V1) Input Qualification Time V1 Rising, ADJ Rising 34 64 94 ms

VTHA ADJ Threshold ADJ Falling 1.032 1.047 1.062 V

VHYSTA ADJ Comparator Hysteresis ADJ Rising 30 50 70 mV

VTHC CMP1, CMP2 Threshold CMP1, CMP2 Falling 0.378 0.387 0.396 V

VHYSTC CMP1, CMP2 Hysteresis CMP1, CMP2 Rising 7.5 10 12.5 mV

ILIM Current Limit V1 = V2 = 8.4V 0.5 1.1 1.6 A

VREV Reverse Comparator Threshold (V1, V2) – VOUT for Power Path Turn-On 25 50 75 mV

tSWITCH Switch Break-Before-Make Time V1 = V2 = 5V, IOUT < –10mA 1 2.5 5 µs

V1_SWITCHOVER Demo Board Switchover Voltage 9.6 9.92 10.24 V

V1_ALARM Demo Board V1 Alarmed Voltage 9.92 10.32 10.74 V

V2_ALARM Demo Board V2 Alarmed Voltage 3.26 3.38 3.53 V

dc2160af

DEMO MANUAL DC2160A

OVERVIEW

TURRETS

JUMPERS

LEDS

The DC2160A includes the LTC4419 2-input pri-

oritizer(U1), LDO regulator with 2.5V output voltage

(U2-LT1763) for powering LEDs and logic, four LEDs

(D4-D7) for visual information, two jumpers (JP1, JP2)

for selecting the power source for the LDO, push but-

ton(SW1) for engaging freshness seal mode, and a few

turrets for connecting the board to power sources, load

and measuring instrument. Auxiliary components—LDO

and logic—are placed on the bottom side of board.

The DC2160A design permits operation of each channel

over its full operating voltage range.

Provision is made for increasing the hysteresis of auxil-

iary comparator 1 and auxiliary comparator 2 by placing

optional resistors R17/R19.

V1 (E1): 12V supply input; should not exceed +18V, and

should be larger than –15V.

V2 (E8): 5V supply input; should not exceed +18V, and

should be larger than –15V.

ADJ (E3): Adjustable comparator non-inverting input for

setting switchover threshold level.

VCMP1_TOP (E2): Input for voltage monitored by first

auxiliary comparator CMP1.

VCMP2_TOP (E7): Input for voltage monitored by second

auxiliary comparator CMP2.

CMP1 (E4): Firstauxiliary comparator CMP1 non-inverting

input.

CMP2 (E6): Second auxiliary comparator CMP2 non-

inverting input.

GND (E5, E11, and E12): Common ground terminal.

OUT (E9): Output for up to 2A load.

LDO_EXT (E13): Positive terminal for external auxiliary

3.5V to 20V power supply.

V2P5V (E10): LDO output voltage terminal (2.5V).

JP1, LDO: ON/OFF switch for LDO.

JP2, LDO_POWER: Power supply selection for LDO.

D4: Indicates LDO output voltage.

D5: Indicates first auxiliary comparator output stage

(CMPOUT1 pin).

D6: Indicates second auxiliary comparator output stage

(CMPOUT2 pin).

D7: Indicates powering load from V2 source.

dc2160af

DEMO MANUAL DC2160A

Refer to Figure 1for proper measurement equipment setup

and follow the procedure below:

1. Place JP1 in position ON and JP2 in position EXTER_

POWER. Turn off all external switches SW1-SW4.

Connect turrets ADJ and GND with external wire.

2. Adjust V1 supply output to 12.0V, V2 to 5V, and auxiliary

power supply to 10V. Use 30Ω resistive load.

3. Turn all external switches SW1-SW4 on.

4. Place scope probes at the ADJ and OUT turrets. Discon-

nect the turrets ADJ and GND and measure the time

between events when the ADJ pin voltage reaches

QUICK START PROCEDURE

1.097V and when the output voltage starts to rise. The

qualification time should be in the range 34ms to 94ms.

5. Turning SW1 off or decreasing V1 to 9V initiates swi-

tchover from V1 to V2. Turning SW1 back to on or

increasing V1 above 10.5V initiates switchover from

V2 to V1 with a qualification time delay.

6. Turnallexternalswitches SW1-SW4offagainandconnect

turrets ADJ and GND with external wire. Use 5Ω resistive

load. Place current probe to measure load current.

7. Turn all external switches SW1-SW4 on. Disconnect the

turretsADJand GND and observeovercurrent transients

with cooling period and thermal protection.

Figure 1. Proper Measurement Equipment Setup

dc2160af

DEMO MANUAL DC2160A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 0 BT1 HOLDER, BATTERY 20mm OPTION KEYSTONE 1066 OPTION

2 2 COUT1,COUT CAP, 1206 10μF 20% 25V TANT AVX F951E106MAAAQ2

3 3 C1, C2, C7 CAP, 2220 47uF 20% 25V X5R TDK CKG57NX5R1E476M500JH

4 0 C3, C4, C5, C6 CAP, 1206 OPTION OPTION

5 0 C8 CAP, 2220 OPTION OPTION

6 2 C9, C10 CAP, 0805 0.1μF 10% 25V X5R AVX 08053C104KAT2A

7 1 C11 CAP, 0805 10nF 10% 16V X7R AVX 0805YC103KAT2A

8 0 C13 CAP, 0805 1nF 10% 50V X7R OPTION AVX 08055C102KAT OPTION

9 1 C14 CAP, 7343 10μF 10% 35V TANT AVX TPSD106K035R0300

10 2 D1, D2 DIODE, 400 WATT TRANSIENT VOLTAGE

SUPPRESSOR

LITTELFUSE INC. SMAJ18CA

11 1 D3 DIODE, 400 WATT TRANSIENT VOLTAGE

SUPPRESSOR

LITTELFUSE INC. SMAJ18A

12 1 D4 LED, 0603 GREEN WURTH ELEKTRONIK 150060GS75000

13 1 D5 LED, 0603 BLUE WURTH ELEKTRONIK 150060BS75000

14 1 D6 LED, 0603 YELLOW WURTH ELEKTRONIK 150060YS75000

15 1 D7 LED, 0603 YELLOW ORANGE LITEON LTST-C190KFKT

16 6 E1, E8, E9, E11, E12, E13 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

17 7 E2, E3, E4, E5, E6, E7, E10 TURRET MILL MAX 2308-2-00-80-00-00-07-0

18 2 JP1, JP2 HEADER, 2mm, 3-PIN WURTH 62000311121

19 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8831

20 1 R1 RES, 0805 1.21M PHMS 1% 1/18W VISHAY CRCW08051M21FKEA

21 2 R2, R7 RES, 0805 47.5k 5% 1/8W VISHAY CRCW080547K5FKEA

22 1 R3 RES, 0805 1M 1% 1/8W VISHAY CRCW08051M00FKEA

23 1 R4 RES, 0805 118k 1% 1/8W VISHAY CRCW0805118KFKEA

24 0 R5 RES, 0805 69.8k 1% 1/8W OPTION VISHAY CRCW080569K8FKEA OPTION

25 0 R6 RES, 0805 OPTION OPTION

26 1 R8 RES, 0805 365k 1% 1/8W VISHAY CRCW0805365KFKEA

27 2 R9, R10 RES, 0805 511k 1% 1/8W VISHAY CRCW0805511KFKEA

28 3 R11, R12, R13 RES, 0805 200Ω 1% 1/8W VISHAY CRCW0805200RFKEA

29 2 R15, R16 RES, 0805 2Ω 1% 1/8W VISHAY CRCW08052R00FKEA

30 0 R17, R19 RES, 0805 1M 1% 1/8W OPTION VISHAY CRCW08051M00FKEA OPTION

31 1 R18 RES, 0805 510Ω 5% 1/8W VISHAY CRCW0805510RJNEA

32 1 SW1 SWITCH, MOMENTARY, PUSH BUTTON WURTH 434 123 050 816

33 1 U1 IC, LTC4419IDD#TRPBF LINEAR TECH LTC4419IDD#TRPBF

34 1 U2 IC, 500mA LOW NOISE LDO

MICROPOWER REGULATOR

LINEAR TECH LT1763CS8-2.5#PBF

35 1 U3 IC, LOW-POWER TRIPLE INVERTER

BUFFER/DRIVER

TEXAS INSTRUMENTS

SN74AUP3G06DCUR

36 2 XJP1, XJP2 SHUNT, 2mm WURTH 60800213421

dc2160af

DEMO MANUAL DC2160A

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

OPT

ADDS HYSTERESIS

TO CMP1

VCMP1_TOP UVLO RANGE 10.30V-11.24V

NOTES: UNLESS OTHERWISE SPECIFIED,

1. ALL RESISITORS AND CAPACITORS ARE 0805.

2.5V UP

CMP1

HIGH

CMP2 OUT

FROM

HIGH

OPT

ADDS HYSTERESIS

TO CMP2

OUT

V2P5V

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

Tuesday, May 05, 2015

2-INPUT PRIORITIZER

N/A

LTC4419IDD#TRPBF

DEMO CIRCUIT 2160A

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

Tuesday, May 05, 2015

2-INPUT PRIORITIZER

N/A

LTC4419IDD#TRPBF

DEMO CIRCUIT 2160A

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

Tuesday, May 05, 2015

2-INPUT PRIORITIZER

N/A

LTC4419IDD#TRPBF

DEMO CIRCUIT 2160A

47uF

25V

2220

YELLOW ORANGE

E10

V2P5V

R18

510

47.5k

47uF

2220

OPT

1206

R19

OPT

C11

10nF

LTC4419IDD#TRPBF

ADJ

V2ON 7

CMP2

CMPOUT2 6

CMPOUT1 5

OUT 8

4GND

CMP1

11 GND

R12

200

SMAJ18CA

R1 1.21M

SMAJ18A

SMA

CMP1

1nF

C13

VCMP1_TOP

ADJ

OPT

1206

118k

SW1

PUSH FOR

FSEAL

R11

200

OPT

R13

200

SMAJ18CA

0.1uF

BLUE

OPT

1206

CMP2

BT1

3.6V

E12

GND

U3 SN74AUP3G06DCUR

3Y 2

GND

2Y 5

1Y 7

VCC 8

OUT

V2ON

TP2

365k

R10

511k

GND

47uF

25V

2220

511k

U2 LT1763CS8-2.5#PBF

SHDN

5BYP 4

SENSE/ADJ 2

OUT 1

GND

R16

1.7V-18V

OPT

47.5k

JP2

OUT

EXTER_POWER

LDO_POWER

OPT

1206

R17

OPT

JP1

OFF

LDO

COUT

10uF

1206

C14

10uF

35V

E13

LDO_EXTER

YELLOW

GREEN

R15

E11

GND

CMPOUT2

TP4

COUT1

10uF

1206

CMPOUT1

TP3

VCMP2_TOP

OPT

2220

C10

0.1uF

dc2160af

DEMO MANUAL DC2160A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2016

LT0816 • 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

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