Linear Technology DC2041A Manuel utilisateur

dc2041af

DEMO MANUAL DC2041A

Description

LTC3255EMSE

Wide VIN Range Fault Protected

50mA Step-Down Charge Pump

Demonstration circuit 2041A is a switched-capacitor

step-down power supply featuring the LT C

3255. The

LTC3255 has the ability to step down voltage 2:1 to ef-

ficiently regulate output voltages less than half the VIN

voltage reducing the input current needed. As VIN reduces

below twice VOUT, the LTC3255 will automatically switch

to 1:1 mode.

The LTC3255 also has an integrated shunt regulator al-

lowing it to provide a regulated output from a 4mA to

20mA current loop.

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

The LTC3255 is a robust device that can survive reverse-

polarity input supplies with current limit and overtem-

perature protection.

Refer to the LTC3255 data sheet for more details on the

electrical and timing specifications.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

7.4mA DC Supply from 4mA to 20mA Current Loop Available Output Current

vs Input Current

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Supply Range 4 48 V

VOUT 2.4 12.5 V

IOUT Shunt Jumper = OFF (SHUNT = GND)

Shunt Jumper = ON (SHUNT = BIAS) IIN = 4mA

7.4

7.8

VIN

EN 220k

10µF

DC2041A F01

0.1µF

4mA TO 20mA INPUT

>10V COMPLIANCE 1µF

1µF

OUTPUT

3.3V

7.4mA

LTC3255

GND

C+C–

SHUNT

BIAS

PGOOD

–

PGOOD

VOUT

2.15M

1.21M

4 8 12 14 20

6 10 16 18

INPUT CURRENT (mA)

AVAILABLE OUTPUT CURRENT (mA)

DC2041A F02

INCREASED

IOUT CAPABILITY

AVAILABLE

IOUT

INPUT

CURRENT

dc2041af

DEMO MANUAL DC2041A

Quick start proceDure

The DC2041 is easy to set up to evaluate the performance

of the LTC3255 with the shunt disabled. Refer to Figure 1

for proper measurement equipment setup with the shunt

disabled and follow the evaluation procedure below. To

evaluate the LTC3255 with the shunt enabled, go to the

SHUNT ENABLED section.

NOTE. When measuring the input or output voltage ripple,

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

oscilloscope probe. 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.

1. Set the EN jumper, JP1, on the DC2041 board to the

ON position.

2. Set the SHUNT jumper, JP3, to the OFF position.

3. Set the VOUT jumper, JP2, to the desired output voltage.

NOTE. Do not set the VOUT jumper to the OPT setting un-

less the appropriate resistor is installed in R7. The VOUT

jumper OPT position is to allow an alternate VOUT setting.

This can be accomplished by adding a resistor to R7 to

set the output to a desired voltage. Refer to the LTC3255

data sheet to calculate the appropriate value for R7.

4. With power off, connect a 0V to 48V, 100mA power

supply to VIN and GND with a voltmeter as shown in

Figure 1.

5. Turn on the VIN input power supply and increase the

supply until the VOUT voltage is in regulation and the

PGOOD voltage is pulled to VOUT.

NOTE.Makesurethattheinputvoltagesdonotexceed60V.

6. With VIN at least 1V above VOUT, increase the load on

VOUT from 0mA to 50mA and observe the input current.

The output ripple may also be observed using an oscil-

loscope with the probe connected as shown in Figure 2.

7. With a 50mA load on VOUT, increase VIN until the cur-

rent on VIN drops to approximately ½ the VOUT current.

8. Refer to the LTC3255 data sheet for more details on

how the LTC3255 operates.

9. When done, turn off all loads and power supplies.

dc2041af

DEMO MANUAL DC2041A

Quick start proceDure

–

+–

PS1

0V TO 48V

100mA Supply

+ –

+–

–L1

0mA TO

100mA Load

–+

DC2041 F01

Figure 1. Proper Measurement Equipment Setup with Shunt Disabled

Figure 2. Measuring Input or Output Ripple

GND

VIN

dc2041af

DEMO MANUAL DC2041A

sHunt enaBLeD

The DC2041 is easy to set up to evaluate the performance

of the LTC3255 with the shunt enabled. Refer to Figure 3

for proper measurement equipment setup of the LTC3255

withtheshuntenabledandfollowtheevaluationprocedure.

NOTE. When measuring the input or output voltage ripple,

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

oscilloscope probe. 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.

1. Set the EN jumper, JP1, on the DC2041 board to the

ON position.

2. Set the SHUNT jumper, JP3, to the ON position.

3. Set the VOUT jumper, JP2, to the desired output voltage.

NOTE. Do not set the VOUT jumper to the OPT setting un-

less the appropriate resistor is installed in R7. The VOUT

jumper OPT position is to allow an alternate VOUT setting.

This can be accomplished by adding a resistor to R7 to

set the output to a desired voltage. Refer to the LTC3255

data sheet to calculate the appropriate value for R7.

4. With power off, connect a 0V to 48V, 100mA power

supply to a controlled current source, a 250Ω ¼ Watt

resistor, VIN and GND with a voltmeter and ammeter

as shown in Figure 3.

5. Turn on the VIN input power supply, PS1, and increase

the supply above twice the VOUT voltage setting plus

9V. (VPS1 > 2VOUT + 2V+ VCS1 + VRS1 + Vammeter).

For example, if VOUT is set to 3.3V, set PS1 above

3.3V • 2 + 9V or 15.6V.

NOTE.Makesurethattheinputvoltagesdonotexceed60V.

6. Turn on and set the input current source to 4mA. Ob-

serve the voltage across the VIN and GND terminals

and across the VOUT and GND terminals. The output

ripple may also be observed using an oscilloscope

with the probe connected as shown in Figure 2.

7. Increase the load on VOUT to about 7.4mA and observe

the input current, input voltage and output voltage.

8. Increase the input current source from 4mA to 20mA.

Observe the voltage across the VIN and GND terminals

and across the VOUT and GND terminals. Adjust PS1

as per equation described in step 5 if needed.

9. Increase the load on VOUT to about 38mA and observe

the output voltage. Observe the input current and input

voltage as the load on VOUT is changed.

10. Refer to the LTC3255 data sheet for more details on

how the LTC3255 operates.

11. When done, turn off all loads and power supplies.

dc2041af

DEMO MANUAL DC2041A

sHunt enaBLeD

–

+–

CS1

4mA TO 20mA

CURRENT SOURCE

–+

PS1 SUPPLY

V > (2VOUT +24V)

+ VCS1 + VRS1

VMAX = 60V

–+

–

0mA TO

40mA Load

–+

DC2041 F03

Figure 3. Proper Measurement Equipment Setup with Shunt Enabled

dc2041af

DEMO MANUAL DC2041A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP CER, 1µF, 25V, X7R 10% 0603 MURATA, GRM188R71E105KA12D

2 1 C2 CAP CER, 1µF, 100V, X7R 10% 0805 TDK, C2012X7S2A105K

3 1 C3 CAP CER, 10µF, 25V, 10% X7R 1206 MURATA, GRM31CR71E106KA12L

4 1 C5 CAP CER, 10pF, 50V, 5% NP0 0402 MURATA, GRM1555C1H100JA01D

5 1 C7 CAP CER, 0.1µF, 16V, 10%, X7R 0402 MURATA, GRM155R71C104KA88D

6 1 R3 RES 1.1M, 1/16W, 1%, 0402 SMD VISHAY, CRCW04021M10FKED

7 1 R4 RES 383kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402383KFKED

8 1 R5 RES 215kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402215KFKED

9 1 R6 RES 133kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402133KFKED

10 1 R8 RES 220kΩ, 1/16W, 5%, 0402 SMD VISHAY, CRCW0402220KJNED

11 2 R12 RES 121kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402121KFKED

12 1 U1 50mA STEP-DOWN CHARGE PUMP LINEAR TECH., LTC3255EMSE#PBF

Additional Demo Board Circuit Components

13 1 C4 CAP CER 2.2µF, 100V, 10%, X7R 1206 MURATA, GRM31CR72A225KA7

14 0 C6 CAP, 0603 SMD OPT

15 0 C8 CAP, 1206 SMD OPT

16 1 R1 RES 0.0Ω, 1/8W, 0805 SMD VISHAY, CRCW08050000Z0EA

17 2 R2, R10 RES 10kΩ, 1/16W, 5%, 0402 SMD VISHAY, CRCW040210K0JNED

18 0 R7 RES, 0402 SMD OPT

19 2 R9, R11 RES 10.0M, 1/16W, 5%, 0402 SMD VISHAY, CRCW040210M0JNED

20 0 R13, R14, R15 RES, 0805 SMD OPT

Hardware: For Demo Board Only

21 4 E1, E2, E3, E4 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0

22 4 E5, E6, E7, E8 TURRET, 0.061 DIA MILL-MAX, 2308-2-00-80-00-00-07-0

23 2 JP1, JP3 HEADER, 3 PIN, 1 ROW .079CC SAMTEC, TMM-103-02-L-S

24 3 JP1-JP3 SHUNT, 2mm SAMTEC, 2SN-KB-G

25 1 JP2 HEADER, 2.0mm, 2 ×5 SAMTEC, TMM-105-02-L-D

26 4 MH1-MH4 STAND-OFF, NYLON 0.375" TALL EYSTONE, 8832 (SNAP ON)

dc2041af

DEMO MANUAL DC2041A

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

ALL CAPACITORS ARE 0402, 10%

1. ALL RESISTORS ARE 0402, 1%, 1/16W

2. INSTALL SHUNTS AS SHOWN.

NOTE: UNLESS OTHERWISE SPECIFIED

OPTIONAL FILTER COMPONENTS

4.0V - 48V50mA

3.3V

12V

OPT

2.5V

M. MERCHANTPRODUCTION FAB 31-5-62

REVISION HISTORY

ETADNOITPIRCSED APPROVEDECO REV

DEMO CIRCUIT 2041A

WIDE VIN RANGE FAULT PROTECTED

N/A LTC3255EMSE

MARTY M.

06 - 05 - 13

50mA STEP - DOWN CHARGE PUMP

SIZE

DATE:

.VER.ONCI

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

VIN_P

VIN

VOUT

R14

OPT

0805

10.0M

5% R6

133k

GND

VIN

OPT

100V

1206

1uF

100V

0805

1.1M

JP1

OFF

383k

GND

10K

R15

OPT

0805

JP3

SHUNT

OFF

1uF

25V

0603

10uF

25V

1206

GND

10pF

50V

R13

OPT

0805

220K

OPT

100V

0603 R5

215k

R11

10.0M

JP2

VOUT

0.1uF

16V

GND

R10

10K

PGOOD

2.2uF

100V

1206

LTC3255EMSE

SHUNT PGOOD

VOUT

C-C+

GNDGND

VIN

BIAS

R12

121k

dc2041af

DEMO MANUAL DC2041A

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 0913 • 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

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC2041A

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