Linear Technology DC1877A Guida rapida alla configurazione

dc1877af

DEMO MANUAL DC1877A

Description

LTC3630AEDHC

High Efficiency High Voltage 500mA

Synchronous Step-Down Converter

Demonstration circuit 1877A is a 500mA output DC/DC

power supply featuring LT C

3630A (DFN package), with

4V to 76V input range. The LTC3630A operates in a high

efficiency Burst Mode

operation and includes internal

high and low side switches. The board provides jumper

selected output voltages of 1.8V, 3.3V, 5V and an option

for additional voltages. LTC3630A has internal soft-start

and a provision for increasing soft-start time.

Included on the board is an ON/OFF jumper that can

also be configured as a precision undervoltage lockout.

Additional pc pads are included for programming current

limit to optimize efficiency and for reducing output voltage

ripple and reducing component size. A terminal (FBO)

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

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

performance summary

is available to allow multiple boards to be paralleled for

increasing output current.

Outputvoltagebetween800mVandVIN canbeprogrammed

using optional resistors. (Higher voltage output capacitors

may be required.)

The LTC3630A data sheet gives a complete description of

the operation and application information. The data sheet

must be read in conjunction with this demo manual.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1877A

Table 1. Specifications are at TA= 25°C

PARAMETER CONDITION VALUE

Input Voltage Range (1.8V, 3.3V Outputs) 4V to 76V

1.8V Output VIN = 76V, IOUT = 500mA 1.8V ±2%

3.3V Output VIN = 76V, IOUT = 500mA 3.3V ±2%

5V Output VIN = 76V, IOUT = 500mA 5V ±2%

Maximum Output Current VIN = 76V, VOUT = 5V 500mA

Typical Output Voltage Ripple VIN = 76V, VOUT = 5V 84mVP-P

Typical Efficiency (See Figure 3)

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dc1877af

DEMO MANUAL DC1877A

Quick start proceDure

This demonstration circuit 1877A can be evaluated using

the setup shown in Figure 1.

1. Connect the DVMs to the input and output. Select 5V

setting using jumper JP1 (B position) and JP2 (A posi-

tion), select ON position for JP3.

2. Withinput powersupply setfor 0V, connect thesupply to

VIN and GND terminals using short (less than 10 inches)

leads, preferably twisted leads. Connect a suitable load

to VOUT and GND terminals.

3. Slowly increase the input power supply to 10V. Observe

output voltage and verify that it meets the specifications

in Table 1. Measure output voltage with and without the

load.

4. Move jumpers JP1 and JP2 to the other two fixed volt-

age settings and verify that each output voltage meets

the values as shown in Table 1.

5. Once the proper output voltages are established, adjust

the load and input voltage within the operating range

and observe the output voltage regulation, ripple voltage

and other parameters.

Notes:

1. IMPORTANT: 60V or higher voltage can result in an

electric shock if care is not taken. Also, hot plugging

the circuit to a power supply that has more than 40V

presentat itsoutput can produce a high voltagetransient

exceeding the absolute maximum input voltage which

can damage the LTC3630A.

2. When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscopeprobe. Measure the input or output voltage

ripple by touching the probe tip directly across the VIN

or VOUT and GND terminals. See Figure 2 for proper

scope probe technique.

Figure 1. Proper Measurement Equipment Setup

Load

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dc1877af

DEMO MANUAL DC1877A

Quick start proceDure

Figure 2. Measuring Input or Output Voltage Ripple

Circuit Options

Detailed information is contained in the data sheet.

Optional Output Voltage: Additional output voltages can

be programmed by selecting proper resistors for the R6

and R7 feedback network. C5 is a feedforward capacitor

to optimize transient response and increase stability. Both

JP1 and JP2 must be in A position if R6 and R7 are used.

The 10V rated output capacitors should be replaced with

suitable voltage ratings.

ISET Components: C3, R3 and R4 are used to provide a

number of features and circuit enhancements such as,

output current limit, input current limit, optimizing output

ripple voltage reduction and efficiency improvement. R4

sets maximum output current, see Figure 2 in LTC3630A

data sheet, leave open for maximum load current. R3 and

R4 can be used to set input current limit. C3 is used to

reduce output voltage ripple and optimize efficiency. See

data sheet for details.

RUN Pin Components: The converter is enabled when

the RUN pin voltage exceeds 1.21V and is disabled when

dropping below 1.1V. Pulling the RUN pin below 700mV

forces a low quiescent current shutdown. Moving JP3

to the ON position allows an internal current to pull the

RUN pin up to 5V. R1 and R2 are used to program input

undervoltage lockout. Select suitable resistors to divide

the input voltage down to the precision threshold voltage

levels that enable and disable the converter. Note that

the maximum voltage on the RUN pin is 6V, therefore a

nominal 5V zener diode (D1) is required to limit the RUN

pin voltage when high input voltages are used.

Figure 3. Efficiency Curves

LOAD CURRENT (A)

EFFICIENCY (%)

DC1788a F03a

100

0.001 0.1 10.01

12VIN

36VIN

76VIN

1.8VOUT

LOAD CURRENT (A)

EFFICIENCY (%)

DC1788a F03b

100

0.001 0.1 10.01

12VIN

36VIN

76VIN

3.3VOUT

LOAD CURRENT (A)

EFFICIENCY (%)

DC1788a F03c

100

0.001 0.1 10.01

12VIN

36VIN

76VIN

5VOUT

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dc1877af

DEMO MANUAL DC1877A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 0.22µF, X7R, 100V, 10%, 0805 MURATA, GRM21AR72A224KAC5L

2 1 C2 CAP, 4.7µF, X7R, 100V, 20%, 2220 TDK, C5750X7R2A475M230KA

3 1 C3 CAP, 220pF, X7R, 50V, 10%, 0603 AVX, 06035C221KAT2A

4 1 C4 CAP, 0.047µF, X7R, 25V, 10%, 0603 AVX, 06033C473KAT2A

5 2 C6, C7 CAP, 100µF, X5R, 10V, 20%, 1210 MURATA, GRM32ER61A107ME20L

6 1 C9 CAP, 0.1µF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A

7 1 L1 IND, POWER, 68µH, 1.6A, 30%, SMD SUMIDA, CDRH105RNP-680NC

8 1 R4 RES, 220k, 1/10W, 5%, 0603 VISHAY, CRCW0603220KJNEA

9 1 R5 RES, 4.7Ω, 1/8W, 5%, 0805 VISHAY, CRCW08054R70JNEA

10 2 R6 RES, 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

11 1 U1 IC, LTC3630AEDHC, DFN 5mm x 3mm LINEAR TECHNOLOGY, LTC3630AEDHC#PBF

Additional Demo Board Circuit Components

1 0 C5 CAP, OPTION, 0603

2 0 C8, C10, C11 CAP, OPTION, 1210

3 0 D1 DIODE, OPTION

4 0 R1, R2, R3, R7 RES, OPTION, 0603

Hardware: For Demo Board Only

1 6 E1, E2, E3, E4, E5, E6 TEST POINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 CONN, HEADER, 1 x 3, 2mm SAMTEC, TMM-103-02-L-S

3 3 JP1, JP2, JP3 SHUNT, 2mm SAMTEC, 2SN-BK-G

4 1 PCB, DC1877A DEMO CIRCUIT 1877A

5 2 STENCIL, DC1877A (TOP AND BOTTOM) STENCIL DC1877A

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dc1877af

DEMO MANUAL DC1877A

D D

C C

B B

A A

OFF

VIN

4V - 76V

GND

FBO

VOUT

1.8V/3.3V/5V

500mA

GND

1. ALL RESISTORS AND CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

JP1 JP2VOUT

1.8V

3.3V

5.0V

EXT. R

GND

3. FOR 5V OUTPUT, VIN RANGE IS 6V-76V.

VIN

VOUT

VIN

VOUT

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

Friday, December 12, 2014

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS

Charlie Z.

N/A

LTC3630AEDHC

DEMO CIRCUIT 1877A

STEP-DOWN CONVERTER

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

Friday, December 12, 2014

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS

Charlie Z.

N/A

LTC3630AEDHC

DEMO CIRCUIT 1877A

STEP-DOWN CONVERTER

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

Friday, December 12, 2014

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS

Charlie Z.

N/A

LTC3630AEDHC

DEMO CIRCUIT 1877A

STEP-DOWN CONVERTER

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Charlie Z.PRODUCTION1 7-9-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Charlie Z.PRODUCTION1 7-9-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Charlie Z.PRODUCTION1 7-9-13

JP1

OPT R7

OPT

C10

OPT

1210

220k

JP3

0.1uF

JP2

C11

OPT

1210

47nF

68uH

SUMIDA CDRH105

220nF

100V

0805

4.7

0805

100uF

10V

1210

LTC3630AEDHC

SW 1

VIN

FBO

VPRG1 7

VPRG2 6

GND

VFB 9

SS 10

ISET

GND

RUN

GND

OPT C5

OPT

220pF

OPT

100uF

10V

1210

OPT

1210

4.7uF

100V

2220

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

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dc1877af

DEMO MANUAL DC1877A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0115 • 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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