Linear Technology DC1817B Quick setup guide

dc1817bfa

DEMO MANUAL DC1817B

Description

LT3798

Isolated No Opto-Coupler

Flyback Controller with PFC

Demonstration circuit 1817B is an off-line isolated flyback

converterfeaturingtheLT

3798.Thedemoboardprovidesa

singleconstant-voltageoutputof24Vat2A.Itisoptimized

to operate over a wide AC input voltage range (90VAC to

265VAC, 47Hz to 63Hz). Output voltage accuracy stays

within ±5% over the whole input voltage and load range. It

provides a high power factor (>0.95) enabling the design

to be used worldwide. It is also designed to comply with

the IEC 61000-3-2 Class D harmonics standard and the

EN55015B conducted EMI standard.

The LT3798 controls an isolated flyback converter in

boundary mode, suitable for applications with voltage or

current regulation. Its novel sensing scheme delivers a

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

well regulated output voltage or current to the secondary

side without the use of an opto-coupler.

TheLT3798isavailableinalowprofile,thermallyenhanced

16-lead MSOP package.

The LT3798 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for demo circuit 1817B.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1817B

(TA= 25°C)

PARAMETER CONDITIONS MIN TYP MAX

Input Range Line Frequency, 47Hz to 63Hz 90VAC 120VAC 265VAC

Output Voltage 24V

Efficiency 90VAC to 265VAC, 2A IOUT 87%

Power Factor 24V/2A Output, 90VAC to 265VAC 0.99 0.98 0.95

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dc1817bfa

DEMO MANUAL DC1817B

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

IMPORTANT NOTE TO CUSTOMERS:

HIGH VOLTAGES ARE PRESENT ON THE DEMO

CIRCUIT, AND CAN LEAD TO LETHAL INJURIES

TO HUMAN BODY. ONLY QUALIFIED PERSONNEL

SHOULD OPERATE IT. IT IS STRONGLY RECOM-

MENDED TO USE SAFETY GLASSES AND AN

ISOLATION TRANSFORMER.

NOTE: Improper components replacement on the demo

circuit can cause performance deteriorations, circuit

malfunction, property damage, and even life threatening

injuries.ContactLinearTechnologyapplicationsengineers

for proper component replacement.

Demonstration circuit 1817B is easy to set up to evaluate

theperformanceoftheLT3798.RefertoFigure1forproper

measurementequipment setup and follow thisprocedure:

1. Connect an adjustable load between + and – output

terminals.

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

Line (L) input and Neutral (N) input.

3. Turn on the power at the input.

NOTE. Make sure that the input voltage does not exceed

the maximum input voltage (265VAC).

4. Check for the proper output voltage.

Once the proper output voltage is established, adjust the

inputvoltageand/ortheloadandobservetheoutputvoltage

regulation, efficiency, power factor and other parameters.

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dc1817bfa

DEMO MANUAL DC1817B

Quick start proceDure

Figure 2. Efficiency vs Input Voltage Figure 3. VOUT vs Load Current

Figure 4. Power Factor vs Input Voltage

Figure 5. 120VAC (PF = 0.99) Figure 6. 230VAC (PF = 0.97)

Input Line Voltage and Current

IIN(AC)

(1A/DIV)

VIN(AC)

(200V/DIV)

5ms/DIV 5ms/DIV

VIN (AC-RMS)

EFFICIENCY (%)

100

250

75 110 130 150 170 190 210 230

270

dc1817b F02

2A LOAD

1A LOAD

LOAD (A)

OUT

(V)

20 0.25 0.5 0.75 1 1.25 1.5 1.75

dc1817b F03

120VIN

240VIN

VIN (AC-RMS)

POWER FACTOR

0.96

0.98

250

0.94

0.92

0.90 110 130 150 170 190 210 230

270

dc1817b F04

2A LOAD

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dc1817bfa

DEMO MANUAL DC1817B

Figure 7. 120VAC (VSW = 450V)

Figure 9. 120VAC

Figure 11. Output Ripple at 120VAC, 2A Load

Figure 8. 230VAC (VSW = 630V)

Switch Node Voltage

Output Current and Switch Node Voltage During Output Short

Figure 10. 230VAC

IC(VIN)

(20V/DIV)

IOUT

(5A/DIV)

VSW

(200V/DIV)

VSW

(100V/DIV)

VOUT

(1V/DIV)

Figure 12. Output Ripple at 230VAC, 2A Load

Quick start proceDure

2µs/DIV

200ms/DIV

2ms/DIV

2µs/DIV

200ms/DIV

2ms/DIV

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dc1817bfa

DEMO MANUAL DC1817B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 B1 RECTIFIER, BRIDGE 600V 0.8A DIODES INC. HD06-T

2 1 CAC1 CAP, 0.1µF 20% 250V/275VAC ECQ-UL PANASONIC, ECQUAAF104M

3 1 C2 CAP, FILM, 0.22µF 20% 400V PANASONIC ECQE4224KF

4 1 C3 CAP, 10µF 20% 50V ALUM RUBYCON 50YXJ10M 5X11

5 1 C6 CAP, 0805 0.1µF 10% 50V X7R TDK, C2012X7R1H104K

6 1 C7 CAP, 0805 2.2µF 10% 50V X5R TDK, C2012X5R1H225K

7 1 C8 CAP, 0805 4.7µF 20% 16V X5R AVX 0805YD475MAT2A

8 2 C10, C11 CAP, 1000µF 20% 35V ELEC NIPPON CHEMI-CON ELXV350ETD102MK30S

9 1 C13 CAP, 1210 2.2nF, 5% 630V U2J MURATA, GRM32A7U2J222JW31D

10 1 C20 CAP, 2.2nF 20% 400V, Y5U TYPE "Y1" VISHAY, 440LD22-R

11 2 C12, C21 CAP, 0805 22pF ±0.25pF 50V NP0 AVX, 08055A220CAT2A

12 2 C23, C25 CAP, 1210 10µF 20% 35V X5R MURATA, GRM32ER7YA106KA12L

13 1 C24 CAP, 1206 47pF 10% 630V NPO AVX, 1206CA470KAT1A

14 1 D1 DIODE, ULTRA FAST RECTIFIER CENTRAL SEMI, CMR1U-10M

15 1 D2 DIODE, FAST SWITCHING DIODES INC, BAV20W-7-F

16 1 D5 DIODE, SUPER BARRIER RECIFIER 20A DIODES INC SBR20A200CTB

17 1 D8 DIODE, SWITCH 100V 400MW SOD123 DIODES INC, 1N4148W-7-F

18 1 F1 FUSE, 2.5A, FAST ACTING COOPER BUSSMAN, SS-5F-3.15A

19 1 L2 CHOKE, D CODE DOUBLE CHOKE TDK/EPCOS, B82731H2701A030

20 1 L1 INDUCTOR, 1mH, 0.78A RADIAL 1000µH TDK, TSL1315RA-102JR78-PF

21 1 Q1 MOSFET, N-CH 650V 21A D2PAK INFINEON, IPB60R165CP

22 2 R1, R2 RES, 1206 100k 1% 1/4W VISHAY CRCW1206100KFKEA

23 1 R3 RES, 0805 100k 1% 1/8W VISHAY, CRCW0805100KFKEA

24 1 R4 RES, 0805 5.49k 1% 1/8W VISHAY, CRCW08055K49FKEA

25 1 R5 RES, 0805 68Ω 5% 1/8W VISHAY, CRCW080568R0JKEA

26 1 R25 RES, 0805 20Ω 1% 1/8W VISHAY, CRCW080520R0FKEA

27 1 R7 RES, 0805 33k 5% 1/8W VISHAY, CRCW080533K0JNEA

28 1 R8 RES, 0.03Ω 1/4W 1% 1206 SMD VISHAY, WSL1206R0300FEA

29 1 R9 RES, 1210 510Ω 5% 1/2W VISHAY, CRCW1210510RJNEA

30 2 R10, R11 RES, 1206 499k 1% 1/4W VISHAY CRCW1206499KFKEA

31 1 R18 RES, 0805 10k 1% 1/8W VISHAY, CRCW080510K0FKEA

32 1 R19 RES, 0805 40.2k 1% 1/8W VISHAY, CRCW080540K2FKEA

33 1 R20 RES, 0805 31.6k 1% 1/8W VISHAY, CRCW080531K6FKEA

34 1 R37 RES, 0805 0Ω 5% 1/8W VISHAY, CRCW08050000Z0EA

35 2 R27, R28 RES, 1206 510Ω 5% 1/4W VISHAY CRCW1206510KJKEA

36 1 R32 RES, 1210 51k 5% 1/2W VISHAY, CRCW121051KOJNEA

37 1 R35 RES, 0805 2.4M 5% 1/8W VISHAY, CRCW08052M40JNEA

38 1 R36 RES, 0805 301k 1% 1/8W VISHAY, CRCW0805301KFKEA

39 1 R38 RES, 0805 24.9k 1% 1/8W VISHAY, CRCW080524K9FKEA

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dc1817bfa

DEMO MANUAL DC1817B

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

40 1 T1 XFMR, FLYBACK WÜRTH ELECTONIK, 750811248

41 1 U1 IC, ISOLATED FLYBACK CONTROLLER LINEAR TECHNOLOGY LT3798EMSE#PBF

42 1 V1 VARISTOR, 320V RMS 13.5MM RADIAL VISHAY VDRS10P320BSE

Additional Circuit Components

1 0 R23 RES, 0805, OPTION OPTION

Hardware/Components (For Demo Board Only)

1 2 J1, J2 TERMINAL BLOCK, 2 POSITION WEIDMULLER, 1715250000

2 4 MH1 TO MH4 STAND-OFF, NYLON, 0.25" KEYSTONE, 8831 (SNAP-ON)

parts List

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dc1817bfa

DEMO MANUAL DC1817B

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

Figure 13. DC1817B Demo Circuit Schematic

C C

B B

90 - 265VAC

1206

FILM

24V/ 2A

0805

N L

INTVCC

R18

10k

C11

1000uF

35V

5.49K

HD06

3 4

VDRS10P320BSE

100k

R20

31.6k

R38

24.9k

0.22uF

400V

R36

301k1%

100k

2.2uF

R27

510

1210

510

1210

R32

51K

1210

0.1uF

50V

R11

499k

C24

47pF

1206

630V

4.7uF

16V

100k

C10

1000uF

35V

SBR20A200CTB

C23

10uF

35V

1210

CMR1U-10M

0.03

1206

27mH

B82731H2701A030

C13

2.2nF

1210

C21

22pF

C12

22pFC25

R35

2.4M 1%

R25

20 1%

1N4148

250V, 2.5A

R28

510

1210

R10

499k

750811248

IPB60R165CP

10uF

50V

C20

2200pF

BAV20W

1mH

1 2

33K

CAC1 0.1uF

275VAC

R19

40.2k

R37

R23

OPT

LT3798EMSE

DCM

FBVINSENSE

CTRL2

CTRL1

EN_UVLO

GND

SENSE

CTRL3

GATE

OVP

INTVCC

COMP-

COMP+

VREF

VIN

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dc1817bfa

DEMO MANUAL DC1817B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2012

LT 1114 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstrationboard (DEMO BOARD) kit being sold orprovidedbyLinear TechnologyisintendedforuseforENGINEERING 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. 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.

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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