Linear Technology DC1739B-C Guida rapida alla configurazione

dc1739bcf

DEMO MANUAL DC1739B-C

DESCRIPTION

LTC3765/LTC3766

120W Isolated Forward Converter

with Synchronous Rectification

Demonstration circuit 1739B-C is a 120W isolated forward

converter with synchronous rectification featuring the

LT C

3765/LTC3766 chip set.

This circuit was designed to demonstrate the high level of

performance, efficiency, and small solution size attainable

using this chip set in an active-clamp-reset forward con-

verter power supply. It operates at 240kHz and produces

a regulated 12V, 10A output from an input voltage range

of 9V to 36V: suitable for telecom, industrial, and other

applications.Ithas an eighth-brick footprint area. Synchro-

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.

nous rectificationhelps to attain efficiency exceeding 94%.

Secondary-side control eliminates complex opto-coupler

feedback, providing fast transient response with minimum

output capacitance. For other output requirements, see the

LTC3766 data sheet or contact the LT C factory.

Design files for this circuit board are available at

http://www.linear.com/demo

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 9 36 V

VOUT Output Voltage 12.0 V

IOUT Output Current Range, Continuous 200LFM 0 10 A

fSW Switching (Clock) Frequency 240 kHz

VOUT(P-P) Output Ripple VIN = 24V, IOUT = 10A (20MHz BW) 40 mVP–P

IREG Output Regulation Line and Load (9VIN to 36VIN, 0AOUT to 10AOUT) ±0.27 %

POUT/PIN Efficiency (See Figure 3) VIN = 24V, IOUT = 10A 92.7 %

Isolation Basic 1500 VDC

Approximate Size Component Area ×Top Component Height 2.3 ×0.9 ×0.47 Inches

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dc1739bcf

DEMO MANUAL DC1739B-C

OPERATING PRINCIPLES

QUICK START PROCEDURE

The LTC3765 active clamp forward controller and gate

driver is used on the primary and provides start-up, gate

drive, and protection functions. Once start-up is accom-

plished, the LTC3766 high efficiency, secondary-side

synchronous forward controller takes over, and provides

the LTC3765 with timing information and bias power

through a small pulse transformer.

When input voltage is applied, the LTC3765 commences

soft-start of the output voltage. When the secondary bias

source reaches the undervoltage threshold, the LTC3766

comes alive and takes control by sending encoded PWM

gate pulses to the LTC3765 through T3. These pulses

also provide primary bias power efficiently over a wide

input voltage range.

The transition from primary to secondary control occurs

at some fraction of the nominal output voltage. From then

on, operation and design is simplified to that of a simple

buckconverter.Secondarycontroleliminatesdelays,tames

large-signal overshoot, and reduces output capacitance

needed to meet transient response requirements.

An optional LC filter stage on the input lowers rms input

current. The filter must have output impedance that is

less than the converter input impedance to assure stabil-

ity. This may require a damping impedance. (See Linear

Technology Application Note 19 for a discussion of input

filter stability.) A source with a 170mΩ or higher ESR

at the filter resonant frequency (~35kHz) is one way of

providing damping for the filter elements provided on the

DC1739B-C. For bench testing, an electrolytic capacitor

has been added at the input terminals to provide suitable

damping and ripple current capability. The values selected

have a filter resonant frequency that is below the converter

switching frequency, thus avoiding high circulating cur-

rents in the filter.

Demonstration circuit 1739B-C is easy to set up to evalu-

ate the performance of the LTC3765/LTC3766. Refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

Note:When measuring the outputvoltage ripple, care must

be taken to avoid a long ground lead on the oscilloscope

probe. Measure the output voltage ripple by touching the

probe tip and ground ring directly across the last output

capacitor as shown in Figure 1.

1. Set an input power supply that is capable of 9V to 36V

to 9V. Then turn off the supply.

2. Direct an airflow of 200lfm across the unit for sustained

operation at full load.

3. Withpower off, connect thesupply to the input terminals

+VIN and –VIN.

a. Input voltages lower than 9V can keep the converter

from turning on due to the undervoltage lockout

feature of the LTC3765 / LTC3766.

b. If efficiency measurements are desired, an ammeter

capable of measuring 10ADC or a resistor shunt can

be put in series with the input supply in order to

measure the DC1739B-C’s input current.

c. A voltmeter with a capability of measuring at least

36V can be placed across the input terminals in order

to get an accurate input voltage measurement.

4. Turn on the power at the input.

Note: Make sure that the input voltage never exceeds 36V.

5. Check for the proper output voltage of 12V. Turn off

the power at the input.

6. Once the proper output voltages are established, con-

nect a variable load capable of sinking 10A at 12V to

the output terminals +VOUT and –VOUT. Set the current

for 0A.

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dc1739bcf

DEMO MANUAL DC1739B-C

QUICK START PROCEDURE

a. If efficiency measurements are desired, an ammeter

or a resistor shunt that is capable of handling 10ADC

can be put in series with the output load in order to

measure the DC1739B-C’s output current.

b. Avoltmeterwithacapabilityofmeasuringat least 12V

can be placed across the output terminals in order

to get an accurate output voltage measurement.

7. Turn on the power at the input.

Note: If there is no output, temporarily disconnect the load

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

8. Once the proper output voltage is again established,

adjust the load within the operating range and observe

the output voltage regulation, ripple voltage, efficiency

and other desired parameters.

OUTPUT CURRENT (A)

EFFICIENCY (%)

POWER DISSIPATION (W)

12VIN

24VIN

24610

PD 12VIN

PD 24VIN

Figure 1. Proper Measurement Equipment Setup

Figure 2. Efficiency and Power Dissipation

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dc1739bcf

DEMO MANUAL DC1739B-C

QUICK START PROCEDURE

Figure 3. Output Ripple at 24VIN and 10AOUT (50mV, 5A, 2µs/Div, 20MHz)

Figure 4. Transient Response Waveform at 24VIN and 5A – 7.5A – 5AOUT (5A, 100mV, 100µs/Div)

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dc1739bcf

DEMO MANUAL DC1739B-C

QUICK START PROCEDURE

Figure 5. Thermal Map, Front Side at 24VIN and 10AOUT (TA= 25°C, 200LFM)

Figure 6. Thermal Map, Back Side at 24VIN and 10AOUT (TA= 25°C, 200LFM)

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dc1739bcf

DEMO MANUAL DC1739B-C

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., AL., TH,100uF, 50V, ME-PX SERIES SUNCON, 50ME100PX

2 4 C2, C3, C4, C5 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12

3 1 C6 CAP., C0G, 47pF, 200V, 5%, 1206 AVX, 12062A470JAT2A

4 1 C7 CAP., C0G, 15pF, 200V, 5%, 0805 AVX, 08052A150JAT2A

5 2 C8, C9 CAP., POSCAP, 68µF, 16V, 20%, 7343 SANYO, 16TQC68M

6 1 C10 CAP., X7R, 2.2nF, 630V, 5%, 1206 MURATA, GRM31A7U2J222JW31

7 2 C12, C27 CAP., X7R, 10µF, 16V, 20%, 1206 MURATA, GRM31CR71C106MA12

8 1 C13 CAP., X7R, 1.0µF, 100V, 10%, 1206 MURATA, GRM31CR72A105KA01

9 1 C14 CAP., X7R, 0.1µF, 250V, 10%, 1206 MURATA, GRM31CR72E104KW03

10 1 C16 CAP., C0G, 1000pF, 25V, 5%, 0402 TDK, C1005C0G1E102J

11 3 C17, C20, C35 CAP., X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT2A

12 1 C18, C33 CAP., C0G, 2200pF, 50V, 5%, 0603 MURATA, GRM1885C1H222JA01D

13 1 C19 CAP., X7R, 12nF, 50V,10%, 0805 AVX, 08055C123KAT2A

14 2 C21, C23 CAP., X7R, 1.0µF, 16V 10%, 0805 MURATA, GRM21BR71C105KA01L

15 2 C22 CAP., C0G, 220pF, 25V, 5%, 0603 AVX, 06033A221JAT2A

16 1 C24 CAP., X7R, 2200pF, 250V, 10%, 1812 MURATA, GA343QR7GD222KW01L

17 1 C25 CAP., COG, 0.033uF, 25V, 5%, 0805 TDK, C2012C0G1E333J

18 1 C28 CAP., X7R, 0.010µF, 50V, 10%, 0603 AVX, 06035C103KAT2A

19 1 C29 CAP., X7R, 0.033µF, 25V, 10%, 0603 AVX, 06033C333KAT2A

20 1 C32 CAP., C0G, 47pF, 25V, 5%, 0603 AVX, 06033A470JAT2A

21 2 C37, C44 CAP., C0G, 1000pF, 25V, 5%, 0603 AVX, 06033A102JAT2A

22 1 C36 CAP., X7R, 1500pF, 50V,10%, 0402 AVX, 04025C152KAT2A

23 1 C39 CAP., X7R, 1.0uF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12

24 1 D1 DIODE ULTRA FAST 1A 200V SMP VISHAY, ES1PD-M3 / 84A

25 2 D3, D5 DIODE SCHOTTKY 40V 0.4A SOD323 DIODES INC., ZHCS400TA

26 1 L1 INDUCTOR, 0.56µH 20% VISHAY, IHLP2525EZERR56M01

27 1 L4 INDUCTOR, 16µH CHAMPS PQA2050-16-LT C

28 1 Q1 MOSFET N-CH 60V POWERPAK-SO-8 INFINEON, BSC028N06NS

29 1 Q3 MOSFET N-CH POWERPAK-SO-8 INFINEON, BSC057N08NS3G

29 1 Q4 MOSFET N-CH 150V POWERPAK-SO-8 INFINEON, BSC190N15NS3

30 1 Q5 MOSFET, P-CH, IRF6217, SO-8 IR, IRF6217TR

31 1 Q6 MOSFET, N-CH, SUPER SOT23 FAIRCHILD, 2N7002

32 1 R1 RES., CHIP, 12.4Ω, 1/4W, 1%, 1206 VISHAY, CRCW120612R4FKEA

33 2 R4 RES., CHIP, 15k, 1W 2512 VISHAY, CRCW251215KJNEG

34 1 R7, R37 RES., CHIP, 909Ω, 1/8W, 1%, 0805 VISHAY, CRCW0805909RFKEA

35 1 R10 RES., CHIP, 0.005Ω, 1W, 1%, 2512 PANASONIC, ERJ-M1WTF5M0U

36 1 R11 RES., CHIP, 51.1Ω, 1/8W, 1%, 0805 VISHAY, CRCW080551R1FKEA

37 1 R14 RES., CHIP, 0.004Ω, 3W, 5%, 1225 SUSUMU, KRL6432D-C-R004-F-T5

38 1 R17 RES., CHIP, 28.7k, 1/8W, 1%, 0805 VISHAY, CRCW080528K7FKEA

39 1 R18 RES., CHIP, 100k, 1/8W, 5%, 0805 VISHAY, CRCW0805100KJNEA

40 4 R19, R20, R23, R24 RES., CHIP, 100Ω, 1/16W, 1%, 0402 VISHAY, CRCW0402100RFKEA

41 1 R22 RES., CHIP, 1.82k, 1/4W, 1%, 1206 VISHAY, CRCW12061K82FKEA

42 1 R25 RES., CHIP, 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA

43 1 R26 RES., CHIP, 2.21k, 1/10W, 1%, 0603 VISHAY, CRCW06032K21FKEA

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dc1739bcf

DEMO MANUAL DC1739B-C

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

44 1 R27 RES., CHIP, 0.750Ω, 1/3W, 1%, 0805 SUSUMU, RL1220S-R75-F

45 1 R29 RES., CHIP, 20.0k, 1/10W, 1%, 0603 VISHAY, CRCW060320K0FKEA

46 1 R35 RES., CHIP, 1.82k, 1/10W, 1%, 0603 VISHAY, CRCW06031K82FKEA

47 1 R36 RES., CHIP, 11.5k, 1/10W, 1%, 0603 VISHAY, CRCW060311K5FKEA

48 1 R38, R39, R56 RES., CHIP, 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA

48 1 R40 RES., CHIP, 464k, 1/10W, 1%, 0603 VISHAY, CRCW0603464KFKEA

49 1 R41 RES., CHIP, 14.7k, 1/10W, 1%, 0603 VISHAY, CRCW060314K7FKEA

49 1 R42 RES., CHIP, 78.7k, 1/10W, 1%, 0603 VISHAY, CRCW060378K7FKEA

50 1 R44 RES., CHIP, 102k, 1/10W, 1%, 0603 VISHAY, CRCW0603102KFKEA

51 1 R46 RES., CHIP, 60.4k, 1/10W, 1%, 0603 VISHAY, CRCW060360K4FKEA

52 1 R47 RES., CHIP, 15.0k, 1/10W, 1%, 0603 VISHAY, CRCW060315K0FKEA

53 1 R48 RES., CHIP, 4.99k, 1/10W, 1%, 0603 VISHAY, CRCW06034K99FKEA

54 1 R49 RES., CHIP, 1.87k, 1/10W, 1%, 0603 VISHAY, CRCW06031K87FKEA

55 1 R50 RES., CHIP, 604Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603604RFKEA

56 1 R51 RES., CHIP, 16.2k, 1/10W, 1%, 0603 VISHAY, CRCW060316K2FKEA

57 1 R52 RES., CHIP, 21.5k, 1/10W,1%, 0603 VISHAY, CRCW060321K5FNEA

58 1 R53 RES., CHIP, 8.25k, 1/10W, 1%, 0603 VISHAY, CRCW06038K25FKEA

49 1 T1 TRANSFORMER, 3T:6T CHAMPS, G45R2-0603-xx

50 1 T3 TRANSFORMER, 1.25T:1T COILCRAFT, CT8281-BL

51 1 U1 I.C. LTC3765EMSE, MSOP-16PIN LINEAR TECH., LTC3765EMSE

52 1 U2 I.C. LTC3766EGN28, SSOP-GN28 LINEAR TECH., LTC3766EGN

Additional Demo Board Circuit Components

53 0 C42, C43 CAP., OPT, 0402 OPT

54 0 C15, C30, C31, C41 CAP., OPT, 0603 OPT

55 0 C38, C40 CAP., OPT, 0805 OPT

56 1 C26 0Ω JUMPER 0603 VISHAY, CRCW06030000Z0EA

57 0 C11, C34 CAP., OPT, 1206 OPT

58 1 D2 DIODE 4148 SOD323 DIODES INC., 1N4148WS

59 0 D4 DIODE OPT 220AA OPT

60 0 D7, D8, D9, D10 DIODE OPT SOD323 OPT

61 0 D11 DIODE OPT SOT23 OPT

62 0 L5 INDUCTOR, OPT 1608 OPT

63 0 Q2 MOSFET OPT POWERPAK-SO-8 OPT

64 0 Q7,Q9 TRANSISTOR, NPN, OPT SOT23 OPT

65 0 Q8 TRANSISTOR, NPN/PNP, OPT SOT23-6 OPT

66 12 R8, R9, R21, R28, R30-R34, R45,

R54, R59

0Ω JUMBER 0402 VISHAY, CRCW04020000Z0ED

67 1 R6 0Ω JUMBER 0603 VISHAY, CRCW06030000Z0ED

68 0 R2, R3, R12, R43, R58 RES., OPT, 0402 OPT

69 0 R55, R57, R60 RES., OPT, 0805 OPT

70 0 T4 TRANSFORMER, OPT OPT

Hardware For Demo Board Only

71 5 E1, E2, E3, E4, E5 TESTPOINT, TURRET, 0.090" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

72 4 J1, J2, J3, J4 CONNECTOR, BANANA JACK Keystone, 575-4

73 4 MTGS AT 4 CORNERS STANDOFF, NYLON 0.5 1/2" KEYSTONE, 8833(SNAP-ON)

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dc1739bcf

DEMO MANUAL DC1739B-C

SCHEMATIC DIAGRAM

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dc1739bcf

DEMO MANUAL DC1739B-C

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-COMPLETE PCB

dc1739bcf

DEMO MANUAL DC1739B-C

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 0813 • 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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