DC1817B - Demo Manual

DEMO MANUAL DC1817B
LT3798
Isolated No Opto-Coupler
Flyback Controller with PFC
Description
Demonstration circuit 1817B is an off-line isolated flyback
converter featuring the LT®3798. The demo board provides a
single constant-voltage output of 24V at 2A. It is optimized
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
Performance Summary
well regulated output voltage or current to the secondary
side without the use of an opto-coupler.
The LT3798 is available in a low profile, thermally enhanced
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
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.
(TA = 25°C)
PARAMETER
CONDITIONS
Input Range
Line Frequency, 47Hz to 63Hz
MIN
TYP
MAX
90VAC
120VAC
265VAC
Output Voltage
24V
Efficiency
90VAC to 265VAC, 2A IOUT
Power Factor
24V/2A Output, 90VAC to 265VAC
87%
0.99
0.98
0.95
dc1817bfa
1
DEMO MANUAL DC1817B
Quick Start Procedure
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 RECOMMENDED 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. Contact Linear Technology applications engineers
for proper component replacement.
Demonstration circuit 1817B is easy to set up to evaluate
the performance of the LT3798. Refer to Figure 1 for proper
measurement equipment setup and follow this procedure:
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
input voltage and/or the load and observe the output voltage
regulation, efficiency, power factor and other parameters.
Figure 1. Proper Measurement Equipment Setup
2
dc1817bfa
DEMO MANUAL DC1817B
25
95
24
90
23
VOUT (V)
100
85
80
22
21
2A LOAD
1A LOAD
75
90
110
130
150
170 190 210
VIN (AC-RMS)
230
250
20
270
120VIN
240VIN
0.25
0
0.5
dc1817b F02
Figure 2. Efficiency vs Input Voltage
0.75
1
1.25
LOAD (A)
1.5
1.75
2
dc1817b F03
Figure 3. VOUT vs Load Current
1
0.98
POWER FACTOR
EFFICIENCY (%)
quick start procedure
0.96
0.94
0.92
0.90
2A LOAD
90
110
130
150
170 190 210
VIN (AC-RMS)
230
250
270
dc1817b F04
Figure 4. Power Factor vs Input Voltage
Input Line Voltage and Current
IIN(AC)
(1A/DIV)
VIN(AC)
(200V/DIV)
5ms/DIV
5ms/DIV
Figure 5. 120VAC (PF = 0.99)
Figure 6. 230VAC (PF = 0.97)
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3
DEMO MANUAL DC1817B
quick start procedure
Switch Node Voltage
VSW
(100V/DIV)
2µs/DIV
2µs/DIV
Figure 7. 120VAC (VSW = 450V)
Figure 8. 230VAC (VSW = 630V)
Output Current and Switch Node Voltage During Output Short
IC(VIN)
(20V/DIV)
IOUT
(5A/DIV)
VSW
(200V/DIV)
200ms/DIV
200ms/DIV
Figure 9. 120VAC
Figure 10. 230VAC
VOUT
(1V/DIV)
2ms/DIV
Figure 11. Output Ripple at 120VAC, 2A Load
4
2ms/DIV
Figure 12. Output Ripple at 230VAC, 2A Load
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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DEMO MANUAL DC1817B
parts list
ITEM
QTY
40
1
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
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
RES, 0805, OPTION
OPTION
Additional Circuit Components
1
0
R23
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)
6
dc1817bfa
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
V1
1
L
4
3
2
275VAC
CAC1 0.1uF
1
2
L2
27mH
B82731H2701A030
VDRS10P320BSE
N
2
90 - 265VAC
5
B1
HD06
L1
1mH
1
F1
250V, 2.5A
C2
0.22uF
400V
FILM
R38
24.9k
R18
10k
1%
OPT
R23
INTVCC
R11
499k
1%
1206
R10
499k
1%
R20
31.6k
R19
40.2k
1%
4
R35
2.4M 1%
301k 1%
1N4148
D8
R36
R2
100k
1%
1206
R1
100k
1%
1206
15
14
9
COMP+
COMPC6
0.1uF
50V
C8
4.7uF
16V
0805
INTVCC
20 1%
R25
R4
5.49K
1%
R3
100k
1%
3
LT3798EMSE
U1
7
8
INTVCC 13
SENSE
GATE
FB
R7
33K
22pF
C21
68
R5
3
C12
22pF
R32
51K
1210
CMR1U-10M
D1
C13
2.2nF
1210
Figure 13. DC1817B Demo Circuit Schematic
C7
2.2uF
R37
0
5 OVP
1 CTRL1
2 CTRL2
3 CTRL3
4 VREF
12 EN_UVLO
16 VINSENSE
10uF
50V
C3
BAV20W
D2
6
4
+
VIN 11
VC
2
4 1
3
10
DCM
GND
17
J1
-
D
+
5
T1
750811248
2
11
10
8
9
Y1
C20
2200pF
Q1
IPB60R165CP
5
6
4
2
3
R8
0.03
1206
C24
47pF
630V
1206
R9
510
1210
1
2
C23
C25
10uF
35V
1210
D5
SBR20A200CTB
+
C10
1000uF
35V
+
1
C11
1000uF
35V
1
R28
510
1210
R27
510
1210
J2
24V / 2A
2
1
-
+
A
B
C
D
DEMO MANUAL DC1817B
Schematic Diagram
dc1817bfa
7
DEMO MANUAL DC1817B
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
Copyright © 2004, Linear Technology Corporation
8
dc1817bfa
Linear Technology Corporation
LT 1114 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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