DC1775A - Demo Manual

DEMO MANUAL DC1775A
LT3799
TRIAC Dimmable Off-Line
Isolated LED Driver with PFC
DESCRIPTION
Demonstration circuit 1775A is an off-line isolated flyback LED driver featuring the LT®3799. The demo board
provides a constant-current output of 0.5A over an LED
string voltage of 20V and 30V. It is optimized to operate
over a wide AC input voltage range (90VAC to 270VAC).
LED current typically stays within ±4% over the whole
input voltage range. The DC1775A provides a steep decline
in LED current with decreasing TRIAC dimming angle, to
achieve a wide TRIAC dimming range. It is designed to
comply with IEC 61000-3-2 Class C harmonics standard
and EN55015B conducted EMI standard.
The LT3799 controls an isolated flyback converter in
boundary mode. Its unique bleeder circuit makes the LED
driver compatible with TRIAC dimmers without additional
components. Its novel current sensing scheme delivers a
PERFORMANCE SUMMARY
well-regulated output current to the secondary side without
using an opto-coupler. Open- and shorted-LED protection
ensures long-term reliability.
The LT3799 is available in a low profile, thermally-enhanced
16-lead MSOP package.
The LT3799 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 1775A.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(TA = 25°C)
PARAMETER
CONDITIONS
Input Range
Line Frequency, 47Hz to 63Hz
Output Current
VIN = 120VAC, VLED = 28V
Output Voltage
Open LED Voltage
MIN
TYP
MAX
UNITS
90
120
270
VAC
0.5
20
(Note 1)
28
34
A
30
V
V
Note 1: For applications with low LED string voltage, FB pin divider resistor
R6 and output clamp D3 can be adjusted to reduce the open voltage limit.
See Protection from Open LED and Shorted LED Faults section in the
LT3799 data sheet for details.
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DEMO MANUAL DC1775A
QUICK START PROCEDURE
IMPORTANT NOTE TO CUSTOMERS:
HIGH VOLTAGES ARE PRESENTED 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 1775A is easy to set up to evaluate the performance of the LT3799. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
1. Connect a 0.5A LED string with forward voltage less
than 30V, but greater than 20V, between LED+ and LED–
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 (270VAC).
4. Check for the proper output current.
Once the proper output current is established, adjust the
input voltage and/or the load and observe the output current
regulation, efficiency, power factor and other parameters.
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1775A
QUICK START PROCEDURE
95
0.95
90
0.90
POWER FACTOR
1.00
EFFICIENCY (%)
100
85
80
0.85
0.80
0.75
75
70
0.70
90 110 130 150 170 190 210 230 250 270
VIN (ACRMS)
Figure 2. Efficiency vs Input Voltage
90 110 130 150 170 190 210 230 250 270
VIN (ACRMS)
Figure 3. Power Factor vs Input Voltage
Input Line Voltage and Current
VINAC
200V/DIV
VINAC
200V/DIV
IINAC
0.2A/DIV
IINAC
0.2A/DIV
5ms/DIV
5ms/DIV
Figure 4. VIN = 90VAC
Figure 5. VIN = 270VAC
Switch Node Voltage
VSW
100V/DIV
VSW
100V/DIV
5μs/DIV
5μs/DIV
Figure 6. VIN = 90VAC
Figure 7. VIN = 270VAC
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DEMO MANUAL DC1775A
QUICK START PROCEDURE
Output Voltage and Switch Node Voltage During Output Open
IC_VIN
20V/DIV
IC_VIN
20V/DIV
VOUT
20V/DIV
VOUT
20V/DIV
VSW
200V/DIV
VSW
200V/DIV
200ms/DIV
200ms/DIV
Figure 8. VIN = 90VAC
Figure 9. VIN = 270VAC
Output Current and Switch Node Voltage During Output Short
IC_VIN
20V/DIV
IC_VIN
20V/DIV
IOUT
2A/DIV
IOUT
2A/DIV
VSW
200V/DIV
VSW
200V/DIV
100ms/DIV
100ms/DIV
Figure 10. VIN = 90VAC
Figure 11. VIN = 270VAC
LED Current vs TRIAC Dimming Angle
0.50
0.45
0.40
ILED (A)
0.35
0.30
220VAC 50Hz
APPLICATION
0.25
0.20
120VAC 60Hz
APPLICATION
0.15
0.10
0.05
0
0
30
90
120
150
60
TRIAC DIMMING ANGLE (DEGREES)
180
Figure 12. LED Current vs TRIAC Dimming Angle: Solid Line, 120VAC 60Hz; Dot Line, 220VAC 50Hz.
Note: For Different Types of TRIAC Dimmers, the Maximum and/or Minimum Dimming Angle May
Vary, Which Gives Different Maximum and/or Minimum LED Current
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DEMO MANUAL DC1775A
QUICK START PROCEDURE
Input Voltage and Switch Node Voltage with 120VAC, 60Hz TRIAC Dimmer
VINAC
200V/DIV
VINAC
200V/DIV
VSW
200V/DIV
VSW
200V/DIV
5ms/DIV
5ms/DIV
Figure 13. 165 Degree TRIAC Dimming Angle
Figure 14. 35 Degree TRIAC Dimming Angle
Input Voltage and Switch Node Voltage with 220VAC, 50Hz TRIAC Dimmer
VINAC
200V/DIV
VINAC
200V/DIV
VSW
200V/DIV
VSW
200V/DIV
5msV/DIV
5ms/DIV
Figure 15. 165 Degree TRIAC Dimming Angle
Figure 16. 35 Degree TRIAC Dimming Angle
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DEMO MANUAL DC1775A
PARTS LIST
ITEM QTY REFERENCE
Required Circuit Components
1
1
B1
2
1
C1
3
1
C2
4
1
C3
5
2
C4, C5
6
1
C6
7
1
C7
8
1
C8
9
1
C9
10
2
C10, C13
11
1
C11
12
1
C12
13
1
D1
14
2
D2, D6
15
1
D3
16
1
D4
17
1
D5
18
1
F1
19
1
L1
20
1
L2
21
1
Q1
22
1
Q2
23
2
R1, R2
24
2
R3, R21
25
1
R4
26
2
R5, R17
27
1
R6
28
4
R7, R8, R12, R13
29
1
R9
30
1
R10
31
1
R11
32
1
R14
33
1
R15
34
1
R16
35
1
R18
36
1
R19
37
1
R20
38
1
R22
39
1
T1
40
1
U1
41
1
V1
42
1
Hardware-For Demo Board Only:
1
4
E1, E2, E4, E5
2
PART DESCRIPTION
MANUFACTURER/PART NUMBER
RECTIFIER, BRIDGE GP 600V 0.8A MINIDIP
CAP., MKP 0.047μF 310VAC 20%
CAP., POLY 220nF 450V 10%
CAP., POLYESTER FILM 47nF 400V 10%
CAP., ALUM 330μF 50V 20% RADIAL
CAP., CERAMIC 10μF 50V 10% 1210
CAP., Y5U 2200pF 400VAC 20%
CAP., NPO 4.7pF 50V ±0.25PF 0603
CAP., X5R 2.2μF 16V 20% 0603
CAP., X7R 0.1μF 16V 10% 0603
CAP., X5R 4.7μF 25V 10% 0805
CAP., X7R 0.022μF 25V 10% 0603
DIODE, SCHOTTKY 1A/200V POWERDI-123
DIODE, SWITCH 400MA 150V SOD123
DIODE, ZENER 1.5W
TVS UNIDIRECT 600W 170V SMB
DIODE, ULTRAFAST RECOVERY RECTIFIER SOD123
FUSE, 1A
IND, 750μH
IND, 39mH COMMON MODE CHOKE
MOSFET N-CHAN., 650V/7A TO-220F
TRANS., PNP 40V 300MW SMD SOT23-3
RES., CHIP 249Ω 0.5W 1% 1210
RES., CHIP 100k 0.06W 5% 0603
RES., CHIP 8.06k 0.25W 1% 1206
RES., CHIP 20Ω 0.06W 5% 0603
RES., CHIP 4.53k 0.06W 1% 0603
RES., CHIP 499k 0.25W 1% 1206
RES., CHIP 130k 0.25W 1% 1206
RES., CHIP 2k 0.06W 5% 0603
RES., CHIP 590k 0.06W 1% 0603
RES., CHIP 100k 0.25W 5% 1206
RES., CHIP 32.4k 0.06W 1% 0603
RES., CHIP 3.48k 0.06W 1% 0603
RES., CHIP 40.2k 0.06W 1% 0603
RES., CHIP 15k 0.06W 5% 0603
RES., CHIP 0.1Ω 0.25W 1% 1206
RES., CHIP 10.7k 0.06W 1% 0603
XFMR., 700μH, 10kHz ±10%
IC, TRIAC DIMMABLE OFFLINE LED DRIVER
VARISTOR 320VRMS 13.5MM RADIAL
FAB, 1775A REV 4. PCB
DIODES INC., HD06-T
VISHAY, BFC233921473
RUBYCON, 450MMK224K
VISHAY, BFC237051473
PANASONIC, EEU-FR1H331L
MURATA, GRM32ER71H106KA12L
VISHAY, 440LD22-R
AVX, 06035A4R7CAT2A
TDK, C1608X5R1C225M
AVX, 0603YC104KAT2A
AVX, 08053D475KAT2A
AVX 06033C223KAT1A
DIODES INC., DFLS1200-7
DIODES INC., BAV20W-7-F
CENTRAL SEMI, CMZ5938B TR
DIODES INC., SMBJ170A-13-F
CENTRAL SEMI., CMMR1U-06
COOPER BUSSMANN, 1025FA1-R
WURTH, 750311431
WURTH, 744821039
FAIRCHILD SEMI., FQPF7N65C
DIODES INC., MMBT3906-7-F
VISHAY, CRCW1210249RFKEA
YAGEO, RC0603JR-07100KL
YAGEO, RC1206FR-078K06L
YAGEO, RC0603JR-0720RL
YAGEO, RC0603FR-074K53L
YAGEO, RC1206FR-07499KL
VISHAY, CRCW1206130KFKEA
YAGEO, RC0603JR-072KL
VISHAY, CRCW0603590KFKEA
VISHAY, CRCW1206100KJNEA
VISHAY, CRCW060332K4FKEA
YAGEO, RC0603FR-073K48L
VISHAY, CRCW060340K2FKEA
YAGEO, RC0603JR-0715KL
YAGEO, PT1206FR-070R1L
VISHAY, CRCW060310K7FKEB
WURTH ELEKTRONIK, 7508111417
LINEAR TECH., LT3799EMSE#PBF
VISHAY, VDRS10P320BSE
DEMO CIRCUIT 1775A
TURRET, TESTPOINT
STENCIL (TOP AND BOTTOM)
MILL MAX, 2501-2-00-80-00-00-07-0
STENCIL DC1775A
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DEMO MANUAL DC1775A
SCHEMATIC DIAGRAM
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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.
7
DEMO MANUAL DC1775A
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
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Linear Technology Corporation
LT 0212 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
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