Linear Technology DC1745A Quick setup guide

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DEMO MANUAL DC1745A

Description

LT3748

100V Isolated Flyback Converter

Demonstration circuit 1745A is an isolated flyback con-

verter featuring the LT3748 controller for high input voltage

applications. It is designed for a 15V output at up to 3A

from a 100V to 400V DC input. The part senses the iso-

lated output voltage from the third winding of the flyback

transformer during the off time of the power switch. No

opto-coupler or signal transformer is required for regula-

tion. A minimum load of approximately 150mA is required

on the output of the circuit to maintain regulation.

Optionally, the demo circuit can be powered from a uni-

versal offline input (85V~265V, 50/60Hz) using the AC

input terminals. Provisions for an EMI filter and surge

protection are provided in the demo circuit. The EMI filter

is designed to meet the EN55022 Class B standard. The

table below summarizes the performance.

The demo circuit can be easily modified for applications

requiring different output voltages/currents from either

an AC or DC input. Some pre-designed EFD25, EF16,

and EF25 transformers from vendors such as Würth

Electronics, Sumida, Pulse Engineering and Coilcraft can

L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

be assembled on the board. Some of these transformers

are listed in Table 1.

The LT3748 is a high input voltage isolated flyback con-

troller that eliminates the need for an optocoupler and

secondary-side reference voltage, all while maintaining

isolation between the primary and secondary-side with

only one part, the transformer, having to cross the isola-

tion barrier. The LT3748 is well suited for a wide variety

of industrial, automotive, medical, telecom, datacom

applications, where regulated isolated output is required.

The LT3748 datasheet gives a complete description of the

part, operation and application information. The datasheet

should be read in conjunction with this quick start guide

for Demonstration Circuit 1745A before powering the

demo circuit.

Design files for this circuit board are available at

http://www.linear.com/demo

perForMAnce sUMMArY

(TA= 25°C)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input DC Voltage IOUT = 3A 100 V

Maximum Input DC Voltage IOUT = 3A 400 V

Typical Start-Up DC Input Voltage Set by UVLO 70 V

Typical Shutdown DC Input Voltage Set by UVLO 60 V

Minimum Input AC Voltage Line Frequency, 50Hz/60Hz 85 VAC (RMS)

Maximum Input AC Voltage Line Frequency, 50Hz/60Hz 265 VAC (RMS)

Output Voltage, VOUT VIN = 100V ~ 400V (DC), IOUT = 150mA ~ 3A 15 ±5% V

Output Current, IOUT VIN = 100V ~ 400V (DC) 3 A

Minimum Load Current with Regulated Output, IMIN 150 mA

Typical Efficiency with DC INPUT VIN = 100V ~ 400V (DC), IOUT = 3A 87 %

Typical Efficiency with AC INPUT VIN = 85V ~ 265V (AC), IOUT = 3A 84 %

Maximum Ripple Voltage, VP-P VIN = 400V (DC), IOUT = 3A 750 mV

Maximum Switching Frequency at Full Load VIN = 400V (DC), IOUT = 3A 155 kHz

Minimum Switching Frequency at Full Load VIN = 100V (DC), IOUT = 3A 55 kHz

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DEMO MANUAL DC1745A

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Figure 1. Demo Board Setup

IMPORTANT NOTE TO CUSTOMERS

HIGH VOLTAGES ARE PRESENTED ONTHE DEMO CIRCUIT,

AND CAN LEAD TO LETHAL INJURIES TO HUMAN BODY.

ONLY QUALIFIED PERSONEL SHOULD OPERATE IT. IT IS

STRONGLY RECOMMENDED TO USE SAFETY GLASSES

AND AN ISOLATION TRANSFORMER.

Demonstration Circuit 1745A can be set up to evaluate

the performance of the LT3748 with high input voltages.

NOTE. IMPROPER COMPONENTSREPLACEMENT ON THE

DEMOCIRCUIT CANCAUSE PERFORMANCEDETERIORA-

TIONS, CIRCUIT MALFUNCTION, PROPERTY DAMAGE,

AND EVEN LIFE-THREATHENING INJURIES. CONTACT

LINEAR TECHNOLOGY APPLICATIONS ENGINEERS FOR

PROPER COMPONENT REPLACEMENT.

A) HIGH DC VOLTAGE APPLICATIONS

Refer to Figure 1 for proper measurement equipment setup

for DC inputs applications. It issuggestedthat theDC power

supply be connected to the VIN and GND ports on the up-

per left of the demo circuit. Follow the procedure below.

1. With power off, connect the DC input power supply to

VIN and GND on the board (Refer to Figure 1).

NOTE. MAKE SURE THAT PROPER INPUT PORTS ARE

USED. For DC INPUT, USE VIN AND GND PORTS ON

THE UPPER LEFT SIDE OF THE DEMO CIRCUIT.

NOTE. Make sure to use DC power supply with right

voltage and current capability and current limit function.

2. Connect the load to the terminals VOUT+and VOUT–on

the output terminals of the board. Apply 150mA load

to the output.

3. Turn on the power at the input. Increase the input volt-

age to minimum as specified in Performance Summary

Table (which is 100V for DC input).

NOTE. Make sure that the input voltage does not exceed

the maximum voltage specified in Performance Sum-

mary Table (which is 400V for DC input). Exceed this

limit might damage the demo circuit.

4. Check for the proper output voltages. The output should

be regulated at 15V (±5%).

NOTE. If there is no output, temporarily disconnect the

power supply. Make sure that the load is connected with

correct polarity. Make sure to connect the power source

to the correct input ports. If the output voltage is out

Table 1. Pre-Designed Transformers for High Voltage Applications with LT3748

TRANSFORMER

PART NUMBER

MAGNETIC

CORE

LPRI

(µH)

LLEAK

(nH)

NPSA

(NP:NS:NA)

RPRI

(mΩ)

RSEC

(mΩ)

TARGET APPLICATION PEAK CURRENT

ISAT (A)INPUT (V) OUTPUT

750311715 EFD25 280 4000 10:1:1 300 20 60 ~ 600 15V/2A 2.5

750311771 EFD25 500 5000 6:1:1 450 15 100 ~ 400 15V/3A 2.5

10393-T029 EFD25 400 6500 7:1:1 300 15 100 ~ 400 12V/3.5A 2.2

750311715 EFD25 280 4000 10:1:1 300 20 60 ~ 600 15V/2A 2.5

750811048 EE16 1500 14000 4.4:1:0.5 2900 210 120 ~ 375 30V/0.3A 0.65

750811050 EE16 1500 30000 4:1:0.3 4900 550 100 ~ 400 48V/0.2A 0.65

7508110117 EE16 650 20000 9:1:2.45 2400 65 100 ~ 400 5V/2A 0.88

7508110313 EE16 1400 30000 6:1:1 4900 185 100 ~ 400 15V/0.6A 0.54

perForMAnce sUMMArY

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DEMO MANUAL DC1745A

of spec, make sure minimum load current is applied to

the output, the load is not set too high, and the current

of power supply is below current limit.

5. Once the proper output voltage is established, adjust the

input and load within the operating range and observe

the output voltage regulation, ripple voltage, efficiency

and other parameters.

NOTE. When measuring the output voltage ripples,

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

oscilloscope probe. Measure the output voltage ripple

by touching the probe tip directly across the VOUT+and

VOUT–terminals. See Figure 3 for proper scope probe

technique.

Typical operation waveforms, regulation and efficiency

curves are shown in Figures 4, 5 and 6.

B) HIGH AC VOLTAGE APPLICATIONS

Optionally, this demo circuit 1745A can be used for off-line

applications with universal ac inputs (85V ~ 265V). Refer

to Figure 2 for proper measurement equipment setup.

Follow the procedure below.

1. With power off, connect the AC power supply to the AC

input connector on the board (Refer to Figure 2).

NOTE. Make sure that ONLY AC input ports are used.

For AC input, use Line and NEUT ports on the lower

left side of the board. Connect AC voltages to DC input

port will damage the demo circuit.

2. Connect the load to the terminals VOUT+and VOUT–on

the board. Apply 150mA load to the output terminals.

3. Turn on the power at the input. Increase the input volt-

age to minimum as specified in Performance Summary

Table (which is 85VRMS for AC input).

NOTE. Make sure that the input voltage does not exceed

the maximum voltage specified in Tableon Performance

Summary (which is 265VRMS for AC input).

4. Check for the proper output voltages. The output should

be regulated at 15V (±5%).

NOTE. If there is no output, temporarily disconnect the

power supply. Make sure that the load is connected

with correct polarity. Make sure you connect the power

source to the correct input ports. If the output voltage

is out of spec, make sure minimum load current is

applied to the output, the load is not set too high, and

the current of power supply is below current limit.

5. Once the proper output voltage is established, adjust the

input and load within the operating range and observe

the output voltage regulation, ripple voltage, efficiency

and other parameters.

NOTE. When measuring the output voltage ripples,

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

oscilloscope probe. Measure the output voltage ripple

by touching the probe tip directly across the VOUT+and

VOUT–terminals. See Figure 3 for proper scope probe

technique.

NOTE. When doing the short-circuit test, make sure to

short the output with very short wires to exclude any

parasitic inductance of the short-circuit.

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DEMO MANUAL DC1745A

Figure 1. Proper Measurement Equipment Setup for DC Input

Figure 2. Proper Measurement Equipment Setup for AC Input

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DEMO MANUAL DC1745A

Figure 3. Proper Scope Probe Placement for Measuring Output Ripple

Efficiency Regulation

Figure 4. Typical Curves of Efficiency and Regulations

LOAD CURRENT (A)

EFFICIENCY (%)

100

02.51.5

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3.52.01.0 3.00.5

VIN = 100V

VIN = 200V

VIN = 300V

VIN = 400V

LOAD CURRENT (A)

OUT

(V)

15.05

15.00

14.90

14.80

14.95

14.85

14.75

14.70 2.51.5

dc1745 F04b

3.52.01.0 3.00.5

VIN = 100V

VIN = 200V

VIN = 300V

VIN = 400V

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DEMO MANUAL DC1745A

Figure 5. Transient with 0.75A to 1.5A at 100V and 400V Input

Figure 6. Typical Waveforms for Short Circuit Conditions

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VOUT = 1V/DIV

IOUT = 500mA/DIV

dc1745 F05a

VIN = 100V

VOUT = 15V

IOUT = 0.75A TO 1.5A

500µs/DIV

VOUT = 500mV/DIV

IOUT = 500mA/DIV

dc1745 F05b

VIN = 400V

VOUT = 15V

IOUT = 0.75A TO 1.5A

500µs/DIV

VDS = 200V/DIV

IOUT = 10A/DIV

ISW = 5A/DIV

dc1745 F06b

VIN = 200V 1ms/DIV

VDS = 200V/DIV

IOUT = 5A/DIV

ISW = 5A/DIV

dc1745 F06a

VIN = 100V 1ms/DIV

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DEMO MANUAL DC1745A

pArts list

QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

2 CAC1,CAC2 Capacitor, 0.1µF, 250V/275VAC ECQ-UL, 20% Panasonic, ECQU2A104ML

2 C1,CAC4 Capacitor, 33µF, 450V, Size 18mm ×20mm, 20% Nippon Chemi-Con, EKXG451ESS330MM20S

1 C2 Capacitor, FILM, 0.1µF, 400VDC, 10% Panasonic, ECQE4104KF

7 C6,C15-C17 Capacitor, X5R, 22µF, 25V, 20%, 1210 AVX, 12103D226MAT2A

1 C7 Capacitor, X5R, 10µF, 6.3V, 20%, 0603 TDK, C1608X5ROJ106M

1 C8 Capacitor, C0G, 470pF, 50V, 10%, 0603 AVX, 06035A471KAT2A

1 C10 Capacitor, X7R, 0.1µF, 200V, 10%, 1210 AVX, 12102C104KAT2A

1 C11 Capacitor, X7R, 15nF, 25V, 10%, 0603 AVX, 06033A153KAT2A

1 C12 Capacitor, 1000pF, 400VAC Vishay, 440LD10-R

1 C20 Capacitor, NPO, 220pF, 100V, 10%, 0805 AVX, 08051A221KAT2A

1 C21 Capacitor, X7R, 4.7µF, 16V, 20%, 0805 AVX, 0805YC475MAT2A

1 C22 Capacitor, C0G, 47pF, 50V, 10%, 0603 AVX, 06035A470KAT2A

1 DZ1 Zener Diode, 15V, SOD-123 Central Semi., CMHZ4702

2 DZ2,DZ3 Zener Diode, 8.2V, SMA (SMB, SMC) Central Semi., CMZ5923B

1 D1 Super Barrier Rec., 20A, 200V, SBR Diodes, SBR20A200CTB

1 D2 Ultrafast Avalanche Rec., BYG20J, SMA Vishay, BYG20J

1 D5 Schottky Barrier Rec., 1N5711WS, SOD-323 Diodes, 1N5711WS-7-F

1 D6 Dual SW Diode, BAV70W, SOT-323 Diodes, BAV70W-7-F

4 D7,D8,D9,D10 Diode Rec.,1N4004, DO-41 Diodes, 1N4004-T

1 F1 Fuse, 250V, 2.5A Cooper Busmann, SS-5F-3.15A

1 LAC1 Current-Compensated Chock Wurth, 7448640414

1 LAC2 Common Mode Chock Wurth, 744822120

1 L1 Inductor, 1µH Vishay, IHLP1616BZER1ROM11

1 Q1 N-CH MOSFET, 600V, 9A, DPAK/D-2-PAK Fairchild, FCD9N60NTM

1 Q2 Power Transistor, SPN03N60C3, SOT-223 Infineon, SPN03N60C3

2 RAC2,RAC3 Resistor, Chip, 1M, 5%, 1206 Vishay, CRCW12061M00JNEA

1 R1 Resistor, Chip, 11.8k, 1%, 0603 Vishay, CRCW060311K8FKEA

1 R2 Resistor, Chip, 0Ω, 0603 Vishay, CRCW06030000Z0EA

1 R3 Resistor, Chip, 1000k, 5%, 1206 Vishay, CRCW12061M00JNEA

1 R5 Resistor, Chip, 6.04k, 1%, 0603 NIC, NRC06F6041TRF

1 R6 Resistor, Chip, 41.2k, 1%, 0603 Vishay, CRCW0603348KFKEA

1 R9 Resistor, Chip, 75k, 5%, 0603 Vishay, CRCW060375K0JKEA

1 R10 Resistor, Chip, 0.04Ω, 1% 0805 (1206) Vishay, WSL0805R0400FEA

1 R11 Resistor, Chip, 30Ω, 1%, 0603 Vishay, CRCW060330R0FKEA

2 R12,R13 Resistor, Chip, 510k, 5%, 1206 Vishay, CRCW1206510KJKEA

1 R17 Resistor, Chip, 10Ω, 5%, 0805 NIC, NRC10J100TRF

1 R18 Resistor, Chip, 68.1k, 1%, 0603 Yageo, RC0603FR-0768K1L

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DEMO MANUAL DC1745A

pArts list

QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 R19 Resistor, 2.2Ω, 4W, 15% Murata, NTPA2R2LDNB0

1 R20 Resistor, Chip, 34.0, 1%, 1206 Vishay, CRCW120634R0FKEA

1 R22 Resistor, Chip, 22k, 5%, 1210 Yageo, RC1210JR-0722KL

1 R23 Resistor, Chip, 6.04, 1%, 0603 Yageo, RC0603FR-076R04L

2 R24,R25 Resistor, Chip, 510, 5%, 1210 NIC, NRC25J511TRF

1TVS VDR Metal Oxide Varistor Vishay, VDRS10P320BSE

1 TVS1 TVS, 150V, SMCJ150, SMC Diodes, SMCJ150A-13-F

1 T1 Transformer, CEFD2513B TYPE Sumida, 10393-T029

1 U1 IC LT3748, MSOP-16 Linear Technology, LT3748#TRPBF

Additional Demo Board Circuit Components

0 R14 Resistor, 1210 (OPT) Option

0 C19 (OPT) Capacitor, 1206 (OPT) Option

0 C14, C18 (OPT) Capacitor, 1210 Option

Hardware/Components (For Demo Board Only)

4 STAND-OFF Stand-Off, Nylon 0.25", Snap On Keystone, 8831

4 J1,J2,J3,J4 Jack, Banana Keystone, 575-4

1 J5 Terminal Block, PCB Mount, 282836-3 Tyco, 282836-3

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DEMO MANUAL DC1745A

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

D D

C C

B B

A A

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VIN

GND

100V - 400VDC

85 - 265VAC

OPTIONAL CIRCUIT

VOUT+

VOUT-

1210

15V / 3A

Nippon Chemi-Con PANASONIC

SMA/SMB/SMC

10/29/10

LINE NEUT.

CAUTION: HANDLING WITH HIGH VOLTAGE INVOLVES RISK TO LIFE.

COMPLY WITH SAFETY REGULATIONS!



GND

VIN

ENABLEENABLE

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TECHNOLOGY 

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

DEMO CIRCUIT 1745A



HIGH VOLTAGE FLYBACK USING THIRD WINDING



LT3748EMS



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



 

 









TECHNOLOGY 







































DEMO CIRCUIT 1745A



HIGH VOLTAGE FLYBACK USING THIRD WINDING



LT3748EMS









 

 









TECHNOLOGY 







































DEMO CIRCUIT 1745A



HIGH VOLTAGE FLYBACK USING THIRD WINDING



LT3748EMS







 













 













 











CAC4

450V



33uF

CAC4

450V



33uF

C16

25V

22uF

C16

25V

22uF

470pF

CAC2

310VAC

BFC233826104

0.1uFCAC2

310VAC

BFC233826104

0.1uF

SPN03N60C3

SOT-223

SPN03N60C3

SOT-223

15nF

C11

15nF

C11

1N4004

SUMIDA

10393-T029

SUMIDA

10393-T029

105

R22

22k

1210

R22

22k

1210

C12

440LD10-R

1000pF

C12

440LD10-R

1000pF

D10

1N4004

D10

1N4004

6.04K

250V, 2.5A

SS-5F-3.15A

250V, 2.5A

SS-5F-3.15A

J4J4

CAC1

310VAC

BFC233826104

0.1uFCAC1

310VAC

BFC233826104

0.1uF

ECQE4104KF

0.1uF

400V

ECQE4104KF

0.1uF

400V

4.7uF

C21

16V

0805

4.7uF

C21

16V

0805

DZ1

CMHZ4702

DZ1

CMHZ4702

TVS

VDRS10P320BSE

TVS

VDRS10P320BSE

R17

0805

R17

0805

SBR20A200CTB

C14 (OPT)

RAC2

1206

RAC2

1206

BYG20J

SMA

BYG20J

SMA

C13

22uF

25V

1210

C13

22uF

25V

1210

1N4004

C19

OPT.

1206

500V

C19

OPT.

1206

500V

11.8K

J5J5

R25

510

1210

R25

510

1210

J2J2 R24

510

1210

R24

510

1210

R12

510K

1206

R12

510K

1206

C10

100nF

1210

C10

100nF

1210

LAC1

WE 7448640414

LAC1

WE 7448640414

TVS1

SMCJ150

150V

TVS1

SMCJ150

150V

R20

1206

R20

1206

R14

OPT.

1210

R14

OPT.

1210

R11

TP1

VDS

TP1

VDS

DZ2

CMZ5923B

DZ2

CMZ5923B

BAV70W

1N5711WS-7-F

LT3748EMS

VIN 1

EN/UVLO

SENSE 7

INTVCC

GATE 6

RFB 16

RREF

GND

10uF

C15C15

75K

J1J1 L1

1.0uH

IHLP1616BZER1R0M01

1.0uH

IHLP1616BZER1R0M01

J3J3

R23

6.04

R23

6.04

R18

68.1K

R18

68.1K

LAC2

WE 744822120

LAC2

WE 744822120

C18 (OPT)C18 (OPT)

R10

0.040

0805

R10

0.040

0805

RAC3

1206

RAC3

1206

41.2K

C20

220pF

0805

100V

C20

220pF

0805

100V

FCD9N60N

1206

1206 22uF

1210

25V

22uF

1210

25V

C17C17

1N4004

R13

510K

1206

R13

510K

1206

2.2

R19

FKN400 SERIES

2.2

R19

FKN400 SERIES

47pF

C22

10V

47pF

C22

10V

R26

1206

R26

1206

+C1

33uF

450V

EKXG451ESS330MM20S

+C1

33uF

450V

EKXG451ESS330MM20S

DZ3

CMZ5923B

DZ3

CMZ5923B

dc1745afa

DEMO MANUAL DC1745A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0411 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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