1
dc1816bfc
DEMO MANUAL DC1816B
Description
LT3799-1
Offline Isolated Flyback LED
Driver with PFC
Demonstration circuit 1816B is an off-line isolated flyback
LED driver featuring LT
®
3799-1. The demo board provides
a single constant current output of 3A over an LED string
voltage from 22V to 38V. It is optimized to operate over
a wide AC input voltage range (90VAC to 305VAC, 47Hz
to 63Hz). LED current typically stays within ±5% over the
whole input voltage range. It provides a high power factor
(>0.9) enabling a single design to be used worldwide. It
is also designed to comply with the IEC 61000-3-2 Class
C harmonics standard and the EN55015B conducted EMI
standard.
The LT3799-1 controls an isolated flyback converter in
boundary mode. Its novel current sensing scheme deliv-
ers a well-regulated output current to the secondary side
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
without using an opto-coupler. Open- and shorted-LED
protection ensures long term reliability.
The LT3799-1 is available in a low profile, thermally-
enhanced 16-lead MSOP package.
The LT3799-1 data sheet gives a complete description
of the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide for demo circuit 1816B.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA = 25°C)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range Line Frequency, 47Hz to 63Hz 90 277 305 VAC
Output Current IOUT VIN = 120VAC, VLED = 36V 3 A
Output Voltage 22 36 38 V
Open LED Voltage (Note 1) 45 V
Note 1: For applications with low LED string voltage, FB pin divider resistor R4 and output clamp Z3 can be adjusted to reduce the open voltage limit.
See “Protection from Open LED and Shorted LED Faults” section in the data sheet for detail.
2
dc1816bfc
DEMO MANUAL DC1816B
Quick start proceDure
Figure 1. Proper Measurement Equipment Setup
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 DETERIORA-
TIONS, CIRCUIT MALFUNCTION, PROPERTY DAMAGE,
AND EVEN LIFE-THREATENING INJURIES. CONTACT
LINEAR TECHNOLOGY APPLICATIONS ENGINEERS FOR
PROPER COMPONENT REPLACEMENT.
Demonstration circuit 1816B is easy to set up to evalu-
ate the performance of the LT3799-1. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
1. Connect a 3A LED string with forward voltage less
than 38V, but greater than 22V, 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 (305VAC).
4. Check for the proper output current.
Once the proper output currents are established, adjust the
input voltage and/or the load and observe the output current
regulation, efficiency, power factor and other parameters.
3
dc1816bfc
DEMO MANUAL DC1816B
Quick start proceDure
Figure 5. VIN = 120VAC Figure 6. VIN = 277VAC
Figure 7. VIN = 120VAC Figure 8. VIN = 277VAC
Input Line Voltage and Current
Switch Node Voltage
Figure 2. Efficiency vs Input Voltage Figure 4. Power Factor vs Input Voltage
Figure 3. IOUT vs Input Voltage
VIN (AC-RMS)
90
EFFICIENCY (%)
60
110 130 150 170 190 210 230 250 270 290 305
DC1816B F02
80
100
50
70
90
VIN (AC-RMS)
90
ILED (A)
110 130 150 170 190 210 230 250 270 290
DC1816B F03
3.0
4.0
2.0
2.5
3.5
305
VIN (AC-RMS)
90
POWER FACTOR
0.92
110 130 150 170 190 210 230 250 270 290
DC1816B F04
0.96
1.00
0.90
0.94
0.98
305
DC1816B F05
VIN AC
200V/DIV
IIN AC
1A/DIV
5ms/DIV DC1816B F06
VIN AC
200V/DIV
IIN AC
1A/DIV
5ms/DIV
DC1816B F07
VSW
100V/DIV
5µs/DIV DC1816B F08
VSW
100V/DIV
5µs/DIV
4
dc1816bfc
DEMO MANUAL DC1816B
Quick start proceDure
Output Voltage and Switch Node Voltage During Output Open
Output Current and Switch Node Voltage During Output Short
Figure 9. VIN = 120VAC Figure 10. VIN = 277VAC
Figure 11. VIN = 120VAC Figure 12. VIN = 277VAC
DC1816B F09
IC VIN
20V/DIV
VOUT
20V/DIV
VSW
200V/DIV
500ms/DIV DC1816B F10
IC VIN
20V/DIV
VOUT
20V/DIV
VSW
200V/DIV
500ms/DIV
DC1816B F11
IC VIN
20V/DIV
IOUT
5A/DIV
VSW
200V/DIV
500ms/DIV DC1816B F12
IC VIN
20V/DIV
IOUT
5A/DIV
VSW
200V/DIV
500ms/DIV
5
dc1816bfc
DEMO MANUAL DC1816B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP, 0.47µF 20% 310V POLYPROPYLENE VISHAY BFC33820474
2 1 C2 CAP, 0.47µF 20% 450V FILM RUBYCON 450MMK474K
3 1 C3 CAP, 22µF 20% 35V ALUM NIC NRSZ220M35V5X11F
4 1 C6 CAP, 0603 10nF 10% 50V X7R AVX 06035C103KAT2A
5 1 C7 CAP, 0603 0.1µF 10% 50V X7R AVX 06035C104KAT2A
6 1 C8 CAP, 0805 4.7µF 20% 16V X5R AVX 0805YD475MAT2A
7 1 C9 CAP, 2220 10µF 20% 100V X7S TDK C5750X7S2A106M
8 2 C10, C11 CAP, 1000µF 20% 63V ELEC PANASONIC EEU-FC1J102
9 1 C13 CAP, 1210 2.2nF 5% 630V U2J MURATA GRM32A7U2J222JW31D
10 1 C20 CAP, 2.2nF 10% Y5B TYPE “Y1” VISHAY 440LD22-R
11 1 C21 CAP, 0603 4.7pF ±0.1pF 50V NP0 AVX 06035A4R7CAT2A
12 4 D1, D2, D3, D4 DIODES, RECTIFIER 1.0A DIODES INC. 1N4005-T
13 2 D5, D6 DIODE, FAST SWITCHING DIODES INC. BAV20W-7-F
14 1 D7 DIODE, ULTRA FAST RECOVERY SILICON RECTIFIER CENTRAL SEMI.CMR1U-10M
15 1 D8 DIODE, SUPER BARRIER RECTIFIER 10A DIODES INC. SBR10U300CT
16 1 D9 DIODE, RECOVERY RECTIFIER CENTRAL SEMI.CMR1U-02M
17 1 F1 FUSE, FAST ACTING 3.15A BUSSMAN SS-5H-3.15A-APH
18 2 L1,L2 IND, 10mH COMMON MODE CHOKE SUMIDA LF2628NP-103
19 1 L3 IND, 150µH LINE CHOKE WÜRTH ELECTRONIK 7447018
20 1 Q1 XSTR, COOL MOS POWER TRANSISTOR INFINEON SPP17N80C3
21 2 R1, R2 RES, 1206 249k 1% 1/4W VISHAY CRCW1206249KFKEA
22 2 R3, R18 RES, 0603 100k 5% 1/10W VISHAY CRCW0603100KJNEA
23 1 R4 RES, 0603 4.32k 1% 1/10W VISHAY CRCW06034K32FKEA
24 1 R5 RES, 0603 20Ω 5% 1/10W VISHAY CRCW060320R0JNEA
25 1 R6 RES, 2512 200k 5% 1W VISHAY CRCW2512200KJNEG
26 1 R7 RES, 0603 2k 5% 1/10W VISHAY CRCW06032K00JNEA
27 1 R8 RES, 1206 0.015Ω 1% 1/4W VISHAY WSL1206R0150FEA
28 1 R9 RES, 1206 10k 1% 1/4W VISHAY CRCW120610K0FKEA
29 2 R10, R11 RES, 1206 499k 1% 1/4W VISHAY CRCW1206499KFKEA
30 1 R12 RES, 0603 3.09k 1% 1/10W VISHAY CRCW06033K09FKEA
31 1 R19 RES, 0603 40.2k 1% 1/10W NIC NRC06F4222TRF
32 1 R20 RES, 0603 16.9k 1% 1/10W VISHAY CRCW060316K9FKEA
33 1 R21 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
34 1 R25 RES, 0603 17.8Ω 1% 1/10W VISHAY CRCW060317R8FKEA
35 1 T1 XFMR, FLYBACK WÜRTH ELECTONIK 750811351
36 1 U1 IC, OFFLINE ISOLATED LED CONTROLLER LINEAR TECH. LT3799EMSE-1
37 1 V1 VARISTOR, 385V RMS 13.5MM RADIAL SEI CV385K10B
38 1 Z2 DIODE, TRANSIENT VOLTAGE SUPPRESSOR DIODES INC. SMBJ130(C)A-13-F
39 1 Z3 DIODE, TRANSIENT VOLTAGE SUPPRESSOR DIODES INC. SMCJ40(C)A-13-F
40 1 Z4 DIODE, TRANSIENT VOLTAGE SUPPRESSOR LITTELFUSE INC. SMCJ220CA
6
dc1816bfc
DEMO MANUAL DC1816B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1 0 C14 CAP, 1206 100pF 5% 1000V U2J MURATA GRM31A7U3A101JW31D
2 0 D10 DIODE, ULTRA FAST RECOVERY SILICON RECTIFIER CENTRAL SEMI. CMR1U-10M
3 0 R13 RES, 1206 10k 1% 1/2W VISHAY CRCW120610K0JNEAHP
4 0 R22 RES, 0603
Hardware—For Demo Board Only
1 2 HS1, HS2 HEAT SINK, TO-220 AAVID THERMALLOY 529802B02500G
2 2 J1, J2 TERMINAL BLOCK, 2 POSITION WEIDMULLER 1715250000
3 1 NUT, TIN PLATE#4-40 ANY, #4-40
4 1 WASHER, #4, FLAT WASHER ANY
5 1 SCREW, 4/40 X 3/8 ANY, 4/40 X 3/8, PHILIPS SCREW
6 1 NUT, TIN PLATE# 2-56 ANY, #2-56
7 1 WASHER, #2, FLAT WASHER ANY
8 1 SPACER, NYLON SHOULDER KEYSTONE, 3051
9 1 SCREW, 2-56 X 3/8 ANY, 2-56 X 3/8 PHILIPS SCREW
10 1 THERMAL PAD BERGQUIST, SP600-58
11 1 SILICONE HEAT SINK RAWN
12 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1816B
13 1 STENCIL STENCIL DC1816B
7
dc1816bfc
DEMO MANUAL DC1816B
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
8
dc1816bfc
DEMO MANUAL DC1816B
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 0413 REV C • 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 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 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
Copyright © 2004, Linear Technology Corporation
