Linear Technology DC2049A Guida rapida alla configurazione

dc2049af

DEMO MANUAL DC2049A

DESCRIPTION

LT3999EMSE

Low Noise Isolated

Power Supply

The DC2049Ademonstrates how apower supply regulates

two output voltage by using the LT

3999 and low dropout

(LDO) regulators.

The LT3999 is a monolithic push-pull DC/DC driver which

features wide input range and small external passive

components.

The LT3999 has duty circle control for ΔVIN compensa-

tion, which allows for a wide input voltage range and low

LDO losses.

TheDC2049Aemploysapush-pulltopologythatinherently

provides a low-noise solution. The design is well suited

to noise sensitive systems such as medical instruments,

industrial sensing and control, data conversion and wide

band communications. The post regulator LDOs reduce

output noise further. For more details about the LDOs,

please check the LT3065 and LT3090 data sheets. 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

TheDC2049A produces an isolated 12VOUT and–12VOUT at

up to 200mA each from a 10V~ 15.5V input voltage range.

This board can be modified, by changing the transformer

(and duty cycle), to produce other output voltages.

TheDC2049A featuresa small transformer,small inductors

and capacitors that work at a 1MHz switching frequency.

The LT3999 data sheet gives a complete description of the

part,operation and applicationsinformation. The datasheet

must be read in conjunction with this demo manual. The

LT3999EMSE is assembled in a 10-lead plastic MSE pack-

age with a thermally enhanced ground pad. Proper board

layout is essential for maximum thermal performance. See

the data sheet section Layout Consideration Check List.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2049A

Specifications are at TA= 25°C

PARAMETERS MIN TYP MAX UNITS

Input Voltage Range 10.0 15.5 VDC

Output Voltage 1 (VOUT1) 11.64 12.0 12.3 VDC

Output Voltage 2 (VOUT2) –12.36 –12.0 –11.64 VDC

Output Current 1 0 200 mA

Output Current 2 0 200 mA

Switching Frequency 1.0 MHz

Isolation 1000 VDC

dc2049af

DEMO MANUAL DC2049A

QUICK START PROCEDURE

DC2049A is easy to set up to evaluate the performance of

the LT3999EMSE. Refer to Figure 1 for proper measure-

ment equipment setup and follow the procedure below:

1. Connect Load 1 (positive) between the VOUT1 and GND

terminals and another Load 2 (negative) between the

VOUT2 and GND terminals.

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

+VIN and –VIN terminals.

3. Turn the input power supply on and make sure the

voltage is between 10V and 15.5V.

4. To measure the output noise, connect one end of a BNC

connector J1. Connect the other end of the BNC cable

to an oscilloscope with a 50Ω input impedance. Refer

to Application Note 70 for more precise techniques for

measuring the output noise.

Figure 1. Test Procedure Setup Drawing for DC2049A

*J1 is the BNC connector to coaxial

cable for noise measurement, please

refer to AN70 Appendix B for details.

dc2049af

DEMO MANUAL DC2049A

QUICK START PROCEDURE

Figure 3. Switch Node Voltage, VIN = 10V

Figure 5. Thermal Image, VIN = 10V, IOUT1 = IOUT2 = 200mA

Figure 4. Switch Node Voltage, VIN = 15V

Figure 6. Thermal Image, VIN = 15V, IOUT1 = IOUT2 = 200mA

Figure 2. Efficiency and Power Loss vs Input Voltage with LT3999 and LDOs

VIN (V)

EFFICIENCY (%)

POWER LOSS (W)

12 14

dc2049a F02

1611 13 15

IOUT1 = 200mA

IOUT2 = 200mA

POWER LOSS

EFFICIENCY

dc2049af

DEMO MANUAL DC2049A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 U1 I.C., Push-Pull DC/DC Driver Linear Tech. Corp. LT3999EMSE#PBF

2 1 U2 I.C., Low Noise Linear Reg. Linear Tech. Corp. LT3065EDD#PBF

3 1 U3 I.C., Negative Linear Reg. Linear Tech. Corp. LT3090EDD#PBF

4 4 D1, D2, D3, D4 Schottky Diode 200V/1AMP Central Semi. CMSH1-200HE

5 1 T1 Xfmr. Würth Elektronik 750314781

6 2 L1, L2 Inductor, 39µH Coilcraft XFL3012-393MEC

7 1 C1 Cap., Alum 10µF 50V 10% Sun Elect., 50CE10BSS

8 1 C2 Cap., X5R 4.7µF 25V 20% 0805 Taiyo Yuden TMK212BJ475MG-T

9 2 C3 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A

10 1 C4 Cap., NPO 180pF 50V 10% 0805 AVX 08055A181KAT2A

11 1 C5 Cap., X7R 4.7µF 25V 20% 1206 TDK C3216X7R1E475M

12 2 C7, C14 Cap., X5R 10µF 50V 20% 1206 TDK C3216X5R1H106M

13 1 C9 Cap., X7R 0.01µF 50V 10% 0603 AVX 06035C103KAT2A

14 2 C10, C16 Cap., X7R 10µF 25V 20% 1206 TDK C3216X7R1E106MT

15 1 C17 Cap., X7R 2200pF 1KV 20% 1206 AVX 1206AC222MAT2A

16 3 R1, R2, R13 Res., Chip 1.00M 0.10W 1% 0603 Vishay CRCW06031M00FKEA

17 1 R4 Res., Chip 143k 0.10W 1% 0603 Vishay CRCW0603143KFKEA

18 1 R5 Res., Chip 86.6k 0.10W 1% 0603 Vishay CRCW060386K6FKEA

19 1 R7 Res., Chip 12.1k 0.10W 1% 0603 Vishay CRCW060312K1FKEA

20 1 R8 Res., Chip 13.3k 0.10W 1% 0603 Vishay CRCW060313K3FKEA

21 1 R9 Res., Chip 49.9k 0.10W 1% 0603 Vishay CRCW060349K9FKEA

22 1 R10 Res., Chip 39Ω 0.125W 5% 0805 Vishay CRCW080539R0JNEA

23 1 R12 Res., Chip 10k 0.50W 5% 1210 Vishay CRCW121010K0JNEA

24 1 R14 Res., Chip 52.3k 0.10W 1% 0603 Vishay CRCW060352K3FKEA

25 1 R16 Res., Chip 10k 0.25W 5% 1206 Vishay CRCW120610K0JNEA

26 1 R17 Res., Chip 243k 0.10W 1% 0603 Vishay CRCW0603243KFKEA

Additional Demo Board Circuit Components

1 1 R11 Res/Jumper, Chip 0Ω 0.10W 0603 Vishay CRCW06030000Z0EA

2 2 C12 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A

3 1 C11 Cap., X5R 1µF 25V 20% 0603 AVX 06033D105MAT2A

4 0 C6, C8, C13, C15 (Opt) Cap., 1206

5 0 R3, R6 (Opt) Res., 0603

6 0 R15 (Opt) Res., 1206

Hardware: For Demo Board Only

1 1 J1 BNC Connector Connex 112404

2 7 E1, E2, E3, E4, E5, E6, E7 Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0

PARTS LIST

dc2049af

DEMO MANUAL DC2049A

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

dc2049af

DEMO MANUAL DC2049A

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 1014 • 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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