DEMO MANUAL DC1947A
LT3799-1
Offline Isolated Flyback LED
Driver with PFC
DESCRIPTION
Demonstration circuit 1947A is an off-line isolated flyback
LED driver featuring LTC®3799-1 . The demo board provides
a single constant current output of 1A over an LED string
voltage from 30V to 50V. It is optimized to operate over a
wide AC input voltage range (90VAC to 277VAC, 47Hz to
63Hz). 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 delivers a well-regulated output current to the secondary side
without using an opto-coupler. Open- and shorted-LED
protection ensures long term reliability.
PERFORMANCE SUMMARY
CONDITIONS
Input Voltage Range
Line Frequency, 47Hz to 63Hz
Output Current IOUT
VIN = 120VAC, VLED = 48V
Open LED Voltage
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 1947A.
Design files for this circuit board are available at
http://www.linear.com/demo
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
Output Voltage
The LT3799-1 is available in a low profile, thermallyenhanced 16-lead MSOP package.
MIN
TYP
MAX
UNITS
90
230
277
VAC
1
30
(Note 1)
48
A
50
V
54
V
Note 1: For applications with low LED string voltage, FB pin divider resistor R4 and output clamp D9 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.
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DEMO MANUAL DC1947A
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 1947A is easy to set up to evaluate the performance of the LT3799-1. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
1. Connect a 1A LED string with forward voltage less than
50V, but greater than 30V, 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 (277VAC).
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.
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1947A
QUICK START PROCEDURE
100
0.98
90
80
POWER FACTOR
1.2
ILED (A)
EFFICIENCY (%)
1.00
1.4
1.0
70
0.8
60
50
0.96
0.94
0.92
0.90
0.6
90 110 130 150 170 190 210 230 250 270
VIN (AC-RMS)
90 110 130 150 170 190 210 230 250 270
VIN (AC-RMS)
90 110 130 150 170 190 210 230 250 270
VIN (AC-RMS)
DC1947a F02
DC1947a F03
DC1947a F04
Figure 2. Efficiency vs Input Voltage
Figure 3. IOUT vs Input Voltage
Figure 4. Power Factor vs Input Voltage
Input Line Voltage and Current
VIN AC
200V/DIV
VIN AC
200V/DIV
IIN AC
500mA/DIV
IIN AC
500mA/DIV
5ms/DIV
5ms/DIV
DC1947a F05
DC1947a F06
Figure 6. VIN = 230VAC
Figure 5. VIN = 120VAC
Switch Node Voltage
VSW
100V/DIV
VSW
100V/DIV
5μs/DIV
Figure 7. VIN = 120VAC
DC1947a F07
5μs/DIV
DC1947a F08
Figure 8. VIN = 230VAC
dc1947af
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DEMO MANUAL DC1947A
QUICK START PROCEDURE
Output Voltage and Switch Node Voltage During Output Open
VOUT
10V/DIV
VOUT
10V/DIV
VSW
200V/DIV
VSW
200V/DIV
200ms/DIV
DC1947a F09
200ms/DIV
DC1947a F10
Figure 10. VIN = 230VAC
Figure 9. VIN = 120VAC
Output Current and Switch Node Voltage During Output Short
IOUT
10A/DIV
IOUT
10A/DIV
IC VIN
100V/DIV
IC VIN
100V/DIV
VSW
200V/DIV
VSW
200V/DIV
200ms/DIV
Figure 11. VIN = 120VAC
DC1947a F11
200ms/DIV
DC1947a F12
Figure 12. VIN = 230VAC
dc1947afb
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DEMO MANUAL DC1947A
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, 310V, 20%
VISHAY, BFC233922104
3
1
C2
CAP, FILM, 0.22μF, 450V, 10%
RUBYCON, 450MPH224K
4
1
C3
CAP, 10μF, 20%, 50V, ALUM
RUBYCON, 50YXJ10M 5X11
5
2
C6, C7
CAP, X7R, 0.01μF, 50V, 10%, 0805
Murata, GRM216R71H103KA01D
6
1
C8
CAP, X5R, 4.7μF, 16V, 20%, 0805
AVX, 0805YD475MAT2A
7
1
C9
CAP, C0G, 47pF, 50V, 10%, 0805
AVX, 08055A470KAT
8
1
C10, C11
CAP, ELEC., 330μF, 63V, 20%
RUBYCON, 63ZL330MEF
9
1
C13
CAP, U2J, 1.5nF, 250V, 5%, 0805
Murata, GRM21A7U2E152JW31D
10
1
C20
CAP, 2.2nF, 10%, TYPE "Y1"
VISHAY, 440LD22-R
11
1
C21
CAP, C0G, 4.7pF, 50V, 0805
AVX, 08055A4R7BAQ2A
12
1
C23
CAP, X7R, 1μF, 100V, 10%, 1206
AVX 12061C105KAT2A
13
1
D1
DIODE, ULTRA FAST RECTIFIER
CENTRAL SEMI.CMR1U-10M
14
2
D2, D8
DIODE, FAST SWITCHING
DIODES INC., BAV20W-7-F
15
1
D3
DIODE, 3A Ultra-Fast REC., Power-DI-5
DIODES INC., PDU340-13
16
1
D4
DIODE, TVS, 600W, 170V, SMB
DIODES INC., SMBJ170A-13-F
17
1
D9
DIODE, TVS, 600W, 48V, SMB
DIODES INC. SMBJ48A-13-F
18
1
F1
FUSE, 2.5A
BUSSMAN, SS-5H-2.5A
19
1
L1
INDUCTOR, 1mH,
TDK, TSL1315RA-102JR78-PF
20
1
L2
CHOKE, D Code Double Choke
EPCOS, B82731H2701A030
21
1
Q1
XSTR, MOSFET, N-CHANNEL 650V
INFINEON, IPB60R165CP
22
2
R1, R2
RES, CHIP., 249k, 1%, 1/4W, 1206
VISHAY, CRCW0805249KFKEA
23
1
R3
RES, CHIP., 200k, 1%, 1/8W, 0805
VISHAY, CRCW0805200KFKEA
24
1
R4
RES, CHIP., 9.31k, 1%, 1/8W, 0805
VISHAY, CRCW08059K31FKEA
25
1
R5
RES, CHIP., 150, 1%, 1/8W, 0805
VISHAY, CRCW0805150RFKEA
26
1
R7
RES, CHIP., 10k, 1%, 1/8W, 0805
VISHAY, CRCW080510KFKEA
27
1
R8
RES, CHIP., 0.03, 1/4W, 1%, 1206
VISHAY, WSL1206R0300FEA
28
2
R10, R11
RES, CHIP., 499k, 1%, 1/4W, 1206
VISHAY, CRCW1206499KFKEA
29
1
R18
RES, CHIP., 100k, 1%, 1/8W, 0805
VISHAY, CRCW0805100KFKEA
30
1
R19
RES, CHIP., 40.2k, 1%, 1/8W, 0805
VISHAY, CRCW080540K2FKEA
31
2
R20, R27
RES, CHIP., 20k, 1%, 1/8W, 0805
VISHAY, CRCW080520KFKEA
32
1
R21
RES, CHIP., 0, 1/8W, 0805
VISHAY, CRCW08050000Z0EA
33
1
R23
RES, CHIP., 3.48k, 1%, 1/8W, 0805
VISHAY, CRCW08053K48FKEA
34
1
R25
RES, CHIP., 20, 5%, 1/8W, 0805
VISHAY, CRCW080520R0JKEA
35
2
R32, R33
RES, CHIP., 200k, 1%, 1/2W, 1210
VISHAY, CRCW1210200KFKEA
36
1
T1
XFMR, FLYBACK
WÜRTH ELECTONIK, 750817251
37
1
U1
IC., Isolated Flyback Controller
LINEAR TECH. LT3799EMSE-1#PBF
38
1
V1
VARISTOR, 385V
Stackpole Electronic, Inc. CV385K10R
dc1947af
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DEMO MANUAL DC1947A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1
0
R22(OPT)
RES, CHIP., 0805
Hardware—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)
dc1947afb
6
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
L
CV385K10R
1
4
2
1
B1
HD06
L1
1mH
F1
300V, 2.5A
SS-5H-2.5A
C2
0.22uF
450VDC
FILM
5
1. ALL CAPACITORS AND RESISTORS ARE 0805.
NOTES: UNLESS OTHERWISE SPECIFIED,
2
310VAC
CAC1 0.1uF
3
L2
27mH
B82731H2701A030
2
1
N
J1
2
90 - 277VAC
-
D
4
R18
100k
1%
3.48K
R23
R11
499k
1%
1206
R10
499k
1%
R20
20k
1%
R19
40.2k
1%
R2
249k
1%
1206
R1
249k
1%
1206
4
R22
OPT
R21
0
D8
BAV20W
5
1
2
3
4
12
16
C3
D2
BAV20W
R5
150
10uF
50V
C7
10nF
FAULT
CTRL1
CTRL2
CTRL3
VREF
NC
VINSENSE
6
1
4
+
CAUTION: HANDLING HIGH VOLTAGE INVOLVES RISK TO LIFE. COMPLY WITH SAFETY REGULATIONS!
+
3
11
VIN
CT
10
FB
R7
10k
C21
4.7pF
COMP+
COMP-
INTVCC
SENSE
GATE
DCM
GND
17
5
C6
10nF
C8
4.7uF
16V
0805
20
R25
3
R32
200k
1210
C13
1.5nF
0805
250V
T1
750817251
7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'
6833/,(')2586(:,7+/,1($57(&+12/2*<3$576
(1*
2
-:
:(,*
3&%'(6
$33529$/6
Y1
C20
2200pF
11
10
9
8
2
+
'$7(
N/A
6,=(
C11
330uF
63V
2
1
J2
1
LT3799EMSE-1
DC1947A
Wednesday, November 28, 2012
,&12
LED-
LED+
6+((7
1 2)
1
2
5(9
0F&DUWK\%OYG
0LOSLWDV&$
3KRQH
)D[
/7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\
R27
20k
0805
DATE
08-15-12
1A / 48V
APPROVED
WEI G.
48W OFFLINE ISOLATED FLYBACK
LED CONTROLLER WITH ACTIVE PFC
TECHNOLOGY
+
PRODUCTION
1
D9
SMBJ48A
REVISION HISTORY
DESCRIPTION
C10
330uF
63V
7,7/( 6&+(0$7,&
C23
1uF
100V
1206
REV
D3
PDU340
&2175$&712
R8
0.03
1206
Q1
IPB60R165CP
5
4
6
3
2
1
ECO
&86720(5127,&(
D1
CMR1U-10M
R33
200k
1210
2
/,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$
&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216
+2:(9(5,75(0$,167+(&86720(5
65(63216,%,/,7<72
9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/
$33/,&$7,21&20321(1768%67,787,21$1'35,17('
&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7
3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5
7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(
C9
47pF
D4
SMBJ170A
LT3799EMSE-1
U1
7
8
13
15
14
9
R4
9.31k
1%
R3
200k
1%
3
A
B
C
D
DEMO MANUAL DC1947A
SCHEMATIC DIAGRAM
dc1947af
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DEMO MANUAL DC1947A
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
dc1947afb
8
Linear Technology Corporation
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●
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