LTC3630EMSE [Linear]

High Efficiency High Voltage 500mA Synchronous Step-Down Converter;


型号：	LTC3630EMSE
厂家：	Linear
描述：	High Efficiency High Voltage 500mA Synchronous Step-Down Converter
文件：	总8页 (文件大小：312K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DEMO MANUAL DC2105A

LTC3630AEMSE/LTC3630EMSE

High Efficiency High Voltage 500mA

Synchronous Step-Down Converter

Description

Demonstration circuit 2105A is a 500mA output DC/DC

power supply. There are two versions: DC2105A-A is a

board featuring LTC^®3630A, with 4V to 76V input range;

DC2105A-B is a board featuring LTC3630, with 4V to 65V

input range. The LTC3630A/LTC3630 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/LTC3630 has internal

soft-start and a provision for increasing soft-start time.

ripple and reducing component size. A terminal (FBO)

is available to allow multiple boards to be paralleled for

increasing output current.

Output voltage between 800mV and V can be pro-

grammedusingoptionalresistors,althoughhighervoltage

output capacitors will be required.

The LTC3630A/LTC3630 data sheet gives a complete de-

scription of the operation and application information.

The data sheet must be read in conjunction with this

demo manual.

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

be configured as a precision undervoltage lockout. Ad-

ditional PC pads are included for programming current

limittooptimizeefficiencyandforreducingoutputvoltage

Design files for this circuit board are available at

http://www.linear.com/demo/DC2105A

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 ^{Specifications are at T}_A^{= 25°C}

PARAMETER

CONDITION

LTC3630A

LTC3630

VALUE

4V to 76V

4V to 65V

1.8V 2ꢀ

3.3 V 2ꢀ

5V 2ꢀ

Input Voltage Range for DC2105A-A

Input Voltage Range for DC2105A-B

1.8V Output

= 20V, V

Load = 100mA

= 5V

OUT

3.3V Output

5V Output

Maximum Output Current

Typical Output Voltage Ripple

500mA

= 5V

75mV

P-P

dc2105af

DEMO MANUAL DC2105A

Quick start proceDure

This DC2105A can be evaluated using the setup shown

in Figure 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 volt-

age and other parameters.

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

setting using jumper JP1 (lower position) and JP2

(upper position), select ON position for JP3.

NOTES:

2. With input power supply set for 0V, connect the sup-

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

present at its output can produce a high voltage tran-

sient exceeding the absolute maximum input voltage

which can damage the LTC3630A/LTC3630.

ply to V and GND terminals using short (less than

10 inches) leads, preferably twisted leads. Connect a

suitable load to V

and GND terminals.

OUT

3. Slowlyincreasetheinputpowersupplyto10V.Observe

outputvoltageandverifythatitmeetsthespecifications

in the Performance Summary. Measure output voltage

with and without the load.

2. When measuring the input or output voltage ripple,

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

oscilloscopeprobe.Measuretheinputoroutputvoltage

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 the Performance Summary.

ripple by touching the probe tip directly across the V

or V

and GND terminals. See Figure 3 for proper

OUT

scope probe technique.

NOTE: A 10µF, 100V electrolytic capacitor is necessary when evaluating circuit

with input voltages greater than 40V, using long input wires and hot plugging

circuit into a powered input supply. See Figure 2.

Figure 1. Proper Measurement Equipment Setup

dc2105af

DEMO MANUAL DC2105A

Quick start proceDure

Circuit Options

LTC3630A/LTC3630 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 op-

timize efficiency. See data sheet for details.

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 feed-forward capacitor

to optimize transient response and increase stability. JP1

and JP2 must be in the lower position if R6 and R7 are

used. The 10V rated output capacitors must be replaced

with suitable voltage ratings.

RUN Pin Components: The converter is enabled when

the RUN pin voltage exceeds 1.21V and is disabled when

dropping below 0.7V. Moving JP3 to the ON position al-

lows 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.

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 out-

put ripple voltage reduction and efficiency improvement.

R4 sets maximum output current, see Figure 2 in the

NON-TWISTED LEADS

TWISTED LEADS

TWISTED WITH

10µF ALUMINUM

ELECTROLYTIC

= 50V

DC2105A F02

20µs/DIV

Figure 2. Hot Plugging Input Voltage Transient Using 12" Leads

Figure 3. Measuring Input or Output Voltage Ripple

100

1.8V

3.3V

OUT

12V

36V

65V

76V

12V

36V

65V

76V

OUT

12V

36V

65V

76V

0.0001

0.001

0.01

0.1

0.0001

0.001

0.01

0.1

0.0001

0.001

0.01

0.1

LOAD CURRENT (A)

DC2105A F04a

DC2105A F04b

DC2105A F04c

Figure 4. Efficiency vs Load Current Curves

dc2105af

DEMO MANUAL DC2105A

parts List

DC2105A-A

ITEM

QTY REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

Required Circuit Components

CAP, 0805 220nF 10ꢀ 100V X7R

CAP, 2220 4.7µF 20ꢀ 100V X7R

CAP, 0603 220pF 10ꢀ 50V X7R

CAP, 0603 47nF 10ꢀ 25V X7R

CAP, 1210 100µF 20ꢀ 10V X5R

CAP, 0603 0.1µF 10ꢀ 25V X7R

IND, 68µH

MURATA GRM21AR72A224KAC5L

TDK C5750X7R2A475M

AVX 06035C221KAT2A

AVX 06033C473KAT

C6, C7

TAIYO YUDEN LMK325ABJ107MM-T

AVX 06033C104KAT2A

SUMIDA CDRH105RNP-680N

VISHAY CRCW0603220KJNEA

VISHAY CRCW08054R70JNEA

VISHAY CRCW06030000Z0EA

LINEAR TECH. LTC3630AEMSE

RES, 0603 220kΩ 5ꢀ 1/10W

RES, 0805 4.7Ω 5ꢀ 1/8W

RES, 0603 0Ω JUMPER

IC, SYNCHRONOUS STEP-DOWN CONVERTER

Additional Demo Board Circuit Components

CAP, 0603 OPTION

CAP, 1210 OPTION

DIODE, OPTION

OPTION

C8, C10, C11

R1, R2, R3, R7

RES, 0603 OPTION

Hardware

E1, E2, E3, E4, E5, E6

JP1, JP2, JP3

TURRET

MILL MAX 2501-2-00-80-00-00-07-0

SAMTEC TMM-103-02-L-S

SAMTEC 2SN-BK-G

HEADER, 3 PIN, 2mm

SHUNT, 2mm

JP1, JP2, JP3

dc2105af

DEMO MANUAL DC2105A

parts List

DC2105A-B

ITEM

QTY REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

Required Circuit Components

CAP, 0805 220nF 10ꢀ 100V X7R

CAP, 2220 4.7µF 20ꢀ 100V X7R

CAP, 0603 220pF 10ꢀ 50V X7R

CAP, 0603 47nF 10ꢀ 25V X7R

CAP, 1210 100µF 20ꢀ 10V X5R

CAP, 0603 0.1µF 10ꢀ 25V X7R

IND, 68µH

MURATA GRM21AR72A224KAC5L

TDK C5750X7R2A475M

AVX 06035C221KAT2A

AVX 06033C473KAT

C6, C7

TAIYO YUDEN LMK325ABJ107MM-T

AVX 06033C104KAT2A

SUMIDA CDRH105RNP-680N

VISHAY CRCW0603220KJNEA

VISHAY CRCW08054R70JNEA

VISHAY CRCW06030000Z0EA

RES, 0603 220kΩ 5ꢀ 1/10W

RES, 0805 4.7Ω 5ꢀ 1/8W

RES, 0603 0Ω JUMPER

IC, SYNCHRONOUS STEP-DOWN CONVERTER

LINEAR TECH. LTC3630EMSE

Additional Demo Board Circuit Components

CAP, 0603 OPTION

CAP, 1210 OPTION

DIODE, OPTION

OPTION

C8, C10, C11

R1, R2, R3, R7

RES, 0603 OPTION

Hardware

E1, E2, E3, E4, E5, E6

JP1, JP2, JP3

TURRET

MILL MAX 2501-2-00-80-00-00-07-0

SAMTEC TMM-103-02-L-S

SAMTEC 2SN-BK-G

HEADER, 3 PIN, 2mm

SHUNT, 2mm

JP1, JP2, JP3

dc2105af

DEMO MANUAL DC2105A

schematic Diagram

N D G

1 7

1 4

1 6

dc2105af

DEMO MANUAL DC2105A

schematic Diagram

N D G

1 7

1 4

1 6

dc2105af

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.

DEMO MANUAL DC2105A

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstrationboard(DEMOBOARD)kitbeingsoldorprovidedbyLinearTechnologyisintendedforuseforENGINEERINGDEVELOPMENT

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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

dc2105af

LT 0713 • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

 LINEAR TECHNOLOGY CORPORATION 2013

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

LTC3630EMSE [Linear]

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