Linear Technology DC2072A Quick setup guide

dc2072af

DEMO MANUAL DC2072A

Description

LT3065

45V, 500mA Low Noise Linear Regulator with

Programmable Current Limit and Power Good

Demonstration circuit 2072A is an adjustable 500mA

linear regulator featuring the LT

3065. The LT3065 is a

micropower, low noise and low dropout voltage linear

regulator. The device supplies 500mA of output current

with a typical dropout voltage of 300mV. A 10nF bypass

capacitor reduces output noise to 25µVRMS in a 10Hz

to 100kHz bandwidth and soft-starts the reference. The

LT3065’s ±45V input voltage rating combined with its

precision current limit make the IC an ideal choice for

robust, high reliability applications.

LT3065 current limit can be programmed by a single

resistor, accurate to ±10% over a wide input voltage and

temperature range. The internal current limit should be

considered when the input-to-output differential is high.

The LT3065 has a PWRGD pin, which becomes high

when the output rises above 90% of its nominal value.

If the output falls below 88.4% of its nominal value for

more than 25µs, the PWRGD pin asserts low. The use of

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

a feedforward cap may cause the PWRGD flag to assert

early during a startup transient. To avoid this, ensure

that the REF/BYP capacitor is significantly larger than the

feedforward capacitor.

LT3065 optimizes stability and transient response with

low ESR ceramic capacitors, requiring a minimum

capacitance of 3.3µF.

The LT3065 is available in the thermally-enhanced 10-lead

3mm × 3mm DFN and 12-lead MSOP packages.

The LT3065 data sheet gives a complete description of

the device, operation and application information. The

data sheet must be read in conjunction with this quick

start guide for DC2072A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2072A

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range VOUT = 5V 5.35 45 V

Output Voltage VOUT Header in JP1

Header in JP2

Header in JP3

Header in JP4

Header in JP5

Header in JP6

Header in JP7

1.176

1.46

1.75

1.94

2.43

3.23

4.85

1.2

1.5

1.8

1.99

2.5

3.32

4.99

1.22

1.54

1.74

2.04

2.57

3.41

5.13

Maximum Output Current VIN = 6V, VOUT = 5V, R10 = 604Ω 445 495 545 mA

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dc2072af

DEMO MANUAL DC2072A

Quick start proceDure

DC2072A is easy to set up to evaluate the performance of

the LT3065. Refer to Figure 1 for the proper measurement

equipment setup and follow the procedure below:

NOTE:Makesurethattheinputvoltagedoesnotexceed45V.

NOTE: The shutdown jumper JP2 shunt is required to be

placed in the OFF or ON position for proper operation.

NOTE: Place the output voltage selection jumper JP1 at

the desired position.

NOTE: Do not hot-plug the input voltage terminal VIN. The

absolute maximum voltage on VIN is 50V and hot-plugging

a power supply through wire leads to the demonstration

circuit can cause the voltage on the extremely low-ESR

ceramic input capacitor to ring to twice its DC value. In

order to protect the IC, a higher ESR Aluminum Electro-

lytic capacitor is placed at the input terminals. This may

protect against some, but not all, input transients due to

hot-plugging with a power supply. See Application Note

88 for more details.

NOTE: Connect the power supply (with power off), load,

and meters as shown in Figure 1.

1. After all connections are made, turn on input power and

verify that the output voltage according to the output

voltage selection jumper JP1. If the output voltage is

different from the above values, use the USER option

and install R8. Select R8 according to the following

equation:

R8 = (VOUT/0.6-1) • 60.4k

NOTE: If the output voltage is too low, temporarily

disconnect the load to make sure that the load is not

set too high.

2. Oncethe proper outputvoltage is established,adjust the

load within the operating range and observe the output

voltage regulation, PWRGD and other parameters.

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dc2072af

DEMO MANUAL DC2072A

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

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dc2072af

DEMO MANUAL DC2072A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X7R, 10µF, 50V, 10% 1210 MURATA, GRM32ER71H106KA12L

2 2 C3, C4 CAP., X7R, 4.7µF, 50V, 10% 1210 MURATA, GRM32ER71H475KA88L

3 1 C5 CAP., X7R, 0.01µF, 16V, 20% 0603 AVX, 0603YC103MAT2A

4 1 C6 CAP., X7R, 1nF, 16V, 20% 0603 AVX, 0603YC102MAT2A

5 1 C7 CAP., X7R, 0.022µF,16V, 20% 0402 AVX, 0402YC223KMAT2A

6 2 R1, R9 RES., CHIP, 60.4k, 0.06W, 1% 0402 VISHAY, CRCW040260K4FKED

7 1 R2 RES., CHIP, 90.9k, 0.06W, 1% 0402 VISHAY, CRCW040290K9FKED

8 1 R3 RES., CHIP, 121k, 0.06W, 1% 0402 VISHAY, CRCW0402121KFKED

9 1 R4 RES., CHIP, 140k, 0.06W, 1% 0402 VISHAY, CRCW0402140KFKED

10 1 R5 RES., CHIP, 191k, 0.06W, 1% 0402 VISHAY, CRCW0402191KFKED

11 1 R6 RES., CHIP, 274k, 0.06W, 1% 0402 VISHAY, CRCW0402274KFKED

12 1 R7 RES., CHIP, 442k, 0.06W, 1% 0402 VISHAY, CRCW0402442KFKED

13 1 R10 RES., CHIP, 604Ω, 0.06W, 1% 0603 VISHAY, CRCW0603604RFKEA

14 1 R12 RES., CHIP, 499k, 0.06W, 1% 0603 VISHAY, CRCW0603499KFKEA

15 1 U1 I.C., MICROPOWER LDO DFN-10-3X3 LINEAR TECH., LT3065EDD

Additional Demo Board Circuit Components

1 1 C1 CAP., ALUM., 22µF, 50V, CE-BSS SERIES SUN SELECT., 50CE22BSS

2 0 R8, R11 (OPT) RES., 0603

Hardware: For Demo Board Only

1 6 E1-E6 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 HEADERS, 2 × 8 (2mm Ctrs.) SAMTEC, TMM-108-02-L-D

3 1 JP2 HEADERS, 3 PINS 2mm Ctrs. SULLINS, NRPN031PAEN-RC

4 2 XJP1, XJP2 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

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dc2072af

DEMO MANUAL DC2072A

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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dc2072af

DEMO MANUAL DC2072A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0214 • 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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