Linear Technology DC2105A-A Guida rapida alla configurazione

dc2105af

DEMO MANUAL DC2105A

Description

LTC3630AEMSE/LTC3630EMSE

High Efficiency High Voltage 500mA

Synchronous Step-Down Converter

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

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

board featuring LT C

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.

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

limit to optimize efficiency and for reducing output voltage 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

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 VIN can be pro-

grammedusingoptionalresistors, although higher voltage

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.

Design files for this circuit board are available at

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

Specifications are at TA= 25°C

PARAMETER CONDITION VALUE

Input Voltage Range for DC2105A-A LTC3630A 4V to 76V

Input Voltage Range for DC2105A-B LTC3630 4V to 65V

1.8V Output VIN = 20V, VOUT Load = 100mA 1.8V ±2%

3.3V Output VIN = 20V, VOUT Load = 100mA 3.3 V ±2%

5V Output VIN = 20V, VOUT Load = 100mA 5V ±2%

Maximum Output Current VIN = 20V, VOUT = 5V 500mA

Typical Output Voltage Ripple VIN = 20V, VOUT = 5V 75mVP-P

dc2105af

DEMO MANUAL DC2105A

Quick start proceDure

This DC2105A 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 (lower position) and JP2

(upper position), select ON position for JP3.

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

ply 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 the Performance Summary. 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 the Performance Summary.

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.

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

present at its output can produce a high voltage tran-

sient exceeding the absolute maximum input voltage

which can damage the LTC3630A/LTC3630.

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 3 for proper

scope probe technique.

Figure 1. Proper Measurement Equipment Setup

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.

dc2105af

DEMO MANUAL DC2105A

Quick start proceDure

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 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.

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

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.

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.

20µs/DIV

VIN (V)

DC2105A F02

TWISTED WITH

10µF ALUMINUM

ELECTROLYTIC

TWISTED LEADS

VIN = 50V

NON-TWISTED LEADS

Figure 2. Hot Plugging Input Voltage Transient Using 12" Leads Figure 3. Measuring Input or Output Voltage Ripple

LOAD CURRENT (A)

EFFICIENCY (%)

100

DC2105A F04a

10.0010.0001 0.01 0.1

12VIN

36VIN

65VIN

76VIN

1.8VOUT

LOAD CURRENT (A)

EFFICIENCY (%)

100

DC2105A F04b

10.0010.0001 0.01 0.1

12VIN

36VIN

65VIN

76VIN

3.3VOUT

LOAD CURRENT (A)

EFFICIENCY (%)

100

DC2105A F04c

10.0010.0001 0.01 0.1

12VIN

36VIN

65VIN

76VIN

5VOUT

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

1 1 C1 CAP, 0805 220nF 10% 100V X7R MURATA GRM21AR72A224KAC5L

2 1 C2 CAP, 2220 4.7µF 20% 100V X7R TDK C5750X7R2A475M

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

4 1 C4 CAP, 0603 47nF 10% 25V X7R AVX 06033C473KAT

5 2 C6, C7 CAP, 1210 100µF 20% 10V X5R TAIYO YUDEN LMK325ABJ107MM-T

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

7 1 L1 IND, 68µH SUMIDA CDRH105RNP-680N

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

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

10 1 R6 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

11 1 U1 IC, SYNCHRONOUS STEP-DOWN CONVERTER LINEAR TECH. LTC3630AEMSE

Additional Demo Board Circuit Components

1 0 C5 CAP, 0603 OPTION OPTION

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

3 0 D1 DIODE, OPTION OPTION

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

Hardware

1 6 E1, E2, E3, E4, E5, E6 TURRET MILL MAX 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 HEADER, 3 PIN, 2mm SAMTEC TMM-103-02-L-S

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

dc2105af

DEMO MANUAL DC2105A

parts List

DC2105A-B

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 0805 220nF 10% 100V X7R MURATA GRM21AR72A224KAC5L

2 1 C2 CAP, 2220 4.7µF 20% 100V X7R TDK C5750X7R2A475M

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

4 1 C4 CAP, 0603 47nF 10% 25V X7R AVX 06033C473KAT

5 2 C6, C7 CAP, 1210 100µF 20% 10V X5R TAIYO YUDEN LMK325ABJ107MM-T

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

7 1 L1 IND, 68µH SUMIDA CDRH105RNP-680N

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

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

10 1 R6 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

11 1 U1 IC, SYNCHRONOUS STEP-DOWN CONVERTER LINEAR TECH. LTC3630EMSE

Additional Demo Board Circuit Components

1 0 C5 CAP, 0603 OPTION OPTION

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

3 0 D1 DIODE, OPTION OPTION

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

Hardware

1 6 E1, E2, E3, E4, E5, E6 TURRET MILL MAX 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 HEADER, 3 PIN, 2mm SAMTEC TMM-103-02-L-S

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

dc2105af

DEMO MANUAL DC2105A

schematic Diagram

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

VIN

VOUT

VIN

VOUT

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04/16/13 12:29:21

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS

CHARLIE Z.

N/A

LTC3630AEMSE

DEMO CIRCUIT 2105A-A

STEP-DOWN CONVERTER

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

04/16/13 12:29:21

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS

CHARLIE Z.

N/A

LTC3630AEMSE

DEMO CIRCUIT 2105A-A

STEP-DOWN CONVERTER

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

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TECHNOLOGY







































04/16/13 12:29:21

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS

CHARLIE Z.

N/A

LTC3630AEMSE

DEMO CIRCUIT 2105A-A

STEP-DOWN CONVERTER

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

CHARLIE Z.

PROD

104/12/13

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

CHARLIE Z.

PROD

104/12/13

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

CHARLIE Z.

PROD

104/12/13

JP1JP1

OPT

OPT R7

OPT

E6E6

E2E2

C10

OPT

1210

C10

OPT

1210

220k

JP3JP3

E3E3

0.1uF

JP2JP2

C11

OPT

1210

C11

OPT

1210

47nF

68uH

SUMIDA CDRH105

68uH

SUMIDA CDRH105

220nF

100V

0805

220nF

100V

0805

4.7

0805

4.7

0805

100uF

10V

1210

100uF

10V

1210

LTC3630AEMSE

SW 1

VIN

FBO

VPRG1 7

VPRG2 6

GND

VFB 9

SS 10

ISET

GND

RUN

GND

E5E5

OPT

OPT C5

OPT

220pF

E1E1

OPT

100uF

10V

1210

100uF

10V

1210

E4E4

OPT

1210

OPT

1210

4.7uF

100V

2220

4.7uF

100V

2220

dc2105af

DEMO MANUAL DC2105A

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

OFF

VIN

4V - 65V

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

VIN

VOUT

VIN

VOUT





 

 









TECHNOLOGY







































04/16/13 12:30:01

HIGH EFFICIENCY, 65V, 500mA SYNCHRONOUS

CHARLIE Z.

N/A

LTC3630EMSE

DEMO CIRCUIT 2105A-B

STEP-DOWN CONVERTER





 

 









TECHNOLOGY







































04/16/13 12:30:01

HIGH EFFICIENCY, 65V, 500mA SYNCHRONOUS

CHARLIE Z.

N/A

LTC3630EMSE

DEMO CIRCUIT 2105A-B

STEP-DOWN CONVERTER





 

 









TECHNOLOGY















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



04/16/13 12:30:01

HIGH EFFICIENCY, 65V, 500mA SYNCHRONOUS

CHARLIE Z.

N/A

LTC3630EMSE

DEMO CIRCUIT 2105A-B

STEP-DOWN CONVERTER

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

CHARLIE Z.

PROD

104/12/13

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

CHARLIE Z.

PROD

104/12/13

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

CHARLIE Z.

PROD

104/12/13

JP1JP1

OPT

OPT R7

OPT

E6E6

E2E2

C10

OPT

1210

C10

OPT

1210

220k

JP3JP3

E3E3

0.1uF

JP2JP2

C11

OPT

1210

C11

OPT

1210

47nF

68uH

SUMIDA CDRH105

68uH

SUMIDA CDRH105

220nF

100V

0805

220nF

100V

0805

4.7

0805

4.7

0805

100uF

10V

1210

100uF

10V

1210

LTC3630EMSE

SW 1

VIN

FBO

VPRG1 7

VPRG2 6

GND

VFB 9

SS 10

ISET

GND

RUN

GND

E5E5

OPT

OPT C5

OPT

220pF

E1E1

OPT

100uF

10V

1210

100uF

10V

1210

E4E4

OPT

1210

OPT

1210

4.7uF

100V

2220

4.7uF

100V

2220

dc2105af

DEMO MANUAL DC2105A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0713 • 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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