Linear Technology DC2270A Quick setup guide

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DEMO MANUAL DC2270A

DESCRIPTION

LT3095

Dual-Channel Low Noise Bias

Generators

Demonstration circuit 2270A is a dual-channel low noise

biasgeneratorfeaturingLT3095.TheLT3095generatestwo

lownoise bias supplies fromacommon input voltage range

from 3V to 20V. Each channel includes a fixed frequency,

peak current mode step-up switching regulator and a low

noise, single resistor programmable linear regulator. The

maximum load current is 50mA for each channel.

Each boost regulator adjusts its output voltage to 2V above

the corresponding linear regulator’s output voltage, opti-

mizing power dissipation, PSRR and transient response.

The integrated boost regulator, frequency compensation

and Schottky diodes minimize the external component

count and simplify system design.

The switching frequency can be programmed either via

oscillator resistor or an external clock from 450kHz to 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

2MHz. The SYNC pin on the demo board is grounded by

default. To synchronize to an external clock, move JP1

to SYNC and apply the external clock to the SYNC turret.

The RTresistor (R2) should be chosen to set the LT3095

internal switching frequency to the SYNC frequency.

The LT3095 is available in a thermally enhanced 24-Lead

3mm × 5mm QFN package.

The LT3095 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 demo circuit 2270.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2270A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 3 20 V

VOUT1 Channel1 Output Voltage 4.9 5 5.1 V

VOUT2 Channel2 Output Voltage 14.7 15 15.3 V

IOUT1 Channel1 Max Output Current 50 mA

IOUT2 Channel2 Max Output Current 50 mA

fSW Switching Frequency RT= 100kΩ 0.95 1 1.05 MHz

VOUT,P-P Output Voltage Peak-to-Peak Noise VIN = 5V, VOUT = 15V, IOUT = 50mA, fSW = 1MHz

20MHz BW

65 µV

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DEMO MANUAL DC2270A

QUICK START PROCEDURE

Demonstration circuit 2270 is easy to set up to evaluate

the performance of the LT3095. Refer to Figure 2 for

proper measurement equipment setup and follow the

procedure below:

1. Place JP1 on RT position.

2. With power off, connect the input power supply to VIN

and GND. Make sure that the input voltage does not

exceed 20V.

3. With power off, connect loads from VOUT1 to GND, and

VOUT2 to GND.

4. Turn on the power at the input.

5. Check for the proper output voltages (5V and 15V).

NOTE: If there is no output, temporarily disconnect the

load to make sure that the load is not set too high or

is shorted.

6. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation and other parameters.

7. An external clock can be added to the SYNC terminal

whenSYNC function is used(JP1onthe SYNC position).

The set switching frequency should be programmed

to the SYNC frequency. See the data sheet section

Programming the Switching Frequency for details.

8. The output noise can be measured by J1 and J2. Please

refer to Application Notes 70 for details.

1µs/DIV

BSTOUT

20mV/DIV

OUT

50µV/DIV

dc2270a F01

= 5V

OUT

= 15V

LOAD

= 50mA

OSC

= 1MHz

20MHz BW

Figure 1. Transient Output Ripple

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DEMO MANUAL DC2270A

QUICK START PROCEDURE

*J1 AND J2 ARE THE BNC CONNECTORS TO COAXIAL CABLE FOR NOISE MEASUREMENT.

PLEASE REFER TO AN70 APPENDIX B FOR DETIALS

Figure 2. Proper Measurement Equipment Setup

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DEMO MANUAL DC2270A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP., 2.2µF, X7R, 25V, 10%, 0805 MURATA, GRM21BR71E225KA73L

2 2 C3, C4 CAP., 10µF, X7R, 25V, 10%, 1210 MURATA, GRM32DR71E106KA12L

3 2 C5, C6 CAP., 2.2µF, X7R, 25V, 10%, 1210 AVX, 12103C225KAT2A

4 2 C7, C8 CAP., 1µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D

5 1 C9 CAP., 0.1µF, X7R, 6.3V, 10%, 0603 AVX, 06036D104KAT2A

6 1 L1 INDUCTOR, 6.8µH COILCRAFT LPS4012-682MR

7 1 L2 INDUCTOR, 10µH COILCRAFT LPS4012-103MR

8 4 R1, R2, R4, R5 RES., CHIP, 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

9 1 R3 RES., CHIP, 300k, 1/10W, 1%, 0603 VISHAY, CRCW0603300KFKEA

10 1 U1 I.C., REGULATOR, QFN24-3X5-UDD LINEAR TECH., LT3095EUDD#PBF

Additional Demo Board Circuit Components

1 0 C10, C11 (OPT) CAP., 0805

2 0 C12, C13 (OPT) CAP., 0603

3 0 R6, R7 (OPT) RES., 0603

4 0 C14 (OPT) CAP, TANT., 10µF, 25V, 20%, 2312 AVX, TAJW106M025RNJ

Hardware: For Demo Board Only

1 10 E1-E10 TESTPOINT, TURRET, 0.094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 HEADER 3 PIN 0.079 SINGLE ROW WURTH, 620 003 111 21

3 1 XJP1 SHUNT, 0.079" CENTER WURTH, 608 002 134 21

4 2 J1-J2 CONN, BNC, 5 PINS CONNEX, 112404

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DEMO MANUAL DC2270A

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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DEMO MANUAL DC2270A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1015 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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