DEMO MANUAL DC1816B
LT3799-1
Offline Isolated Flyback LED
Driver with PFC
Description
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
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
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
PARAMETER
Input Voltage Range
Output Current I
OUT
Output Voltage
Open LED Voltage
(Note 1)
CONDITIONS
(T
A
= 25°C)
MIN
90
22
45
TYP
277
3
36
38
MAX
305
UNITS
VAC
A
V
V
Line Frequency, 47Hz to 63Hz
V
IN
= 120VAC, V
LED
= 36V
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.
dc1816bfc
1
DEMO MANUAL DC1816B
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 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.
Figure 1. Proper Measurement Equipment Setup
dc1816bfc
2
DEMO MANUAL DC1816B
Quick start proceDure
100
4.0
1.00
90
EFFICIENCY (%)
80
3.5
POWER FACTOR
90 110 130 150 170 190 210 230 250 270 290 305
V
IN
(AC-RMS)
DC1816B F03
0.98
0.96
I
LED
(A)
3.0
70
60
50
0.94
0.92
0.90
2.5
90 110 130 150 170 190 210 230 250 270 290 305
V
IN
(AC-RMS)
DC1816B F02
2.0
90 110 130 150 170 190 210 230 250 270 290 305
V
IN
(AC-RMS)
DC1816B F04
Figure 2. Efficiency vs Input Voltage
Input Line Voltage and Current
Figure 3. I
OUT
vs Input Voltage
Figure 4. Power Factor vs Input Voltage
V
IN
AC
200V/DIV
V
IN
AC
200V/DIV
I
IN
AC
1A/DIV
I
IN
AC
1A/DIV
5ms/DIV
DC1816B F05
5ms/DIV
DC1816B F06
Figure 5. V
IN
= 120VAC
Switch Node Voltage
Figure 6. V
IN
= 277VAC
V
SW
100V/DIV
V
SW
100V/DIV
5µs/DIV
DC1816B F07
5µs/DIV
DC1816B F08
Figure 7. V
IN
= 120VAC
Figure 8. V
IN
= 277VAC
dc1816bfc
3
DEMO MANUAL DC1816B
Quick start proceDure
Output Voltage and Switch Node Voltage During Output Open
IC V
IN
20V/DIV
V
OUT
20V/DIV
IC V
IN
20V/DIV
V
OUT
20V/DIV
V
SW
200V/DIV
V
SW
200V/DIV
500ms/DIV
DC1816B F09
500ms/DIV
DC1816B F10
Figure 9. V
IN
= 120VAC
Figure 10. V
IN
= 277VAC
Output Current and Switch Node Voltage During Output Short
IC V
IN
20V/DIV
IC V
IN
20V/DIV
I
OUT
5A/DIV
I
OUT
5A/DIV
V
SW
200V/DIV
500ms/DIV
V
SW
200V/DIV
DC1816B F11
500ms/DIV
DC1816B F12
Figure 11. V
IN
= 120VAC
Figure 12. V
IN
= 277VAC
dc1816bfc
4
DEMO MANUAL DC1816B
parts List
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
QTY
1
1
1
1
1
1
1
2
1
1
1
4
2
1
1
1
1
2
1
1
2
2
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
REFERENCE
C1
C2
C3
C6
C7
C8
C9
C10, C11
C13
C20
C21
D1, D2, D3, D4
D5, D6
D7
D8
D9
F1
L1,L2
L3
Q1
R1, R2
R3, R18
R4
R5
R6
R7
R8
R9
R10, R11
R12
R19
R20
R21
R25
T1
U1
V1
Z2
Z3
Z4
PART DESCRIPTION
CAP, 0.47µF 20% 310V POLYPROPYLENE
CAP, 0.47µF 20% 450V FILM
CAP, 22µF 20% 35V ALUM
CAP, 0603 10nF 10% 50V X7R
CAP, 0603 0.1µF 10% 50V X7R
CAP, 0805 4.7µF 20% 16V X5R
CAP, 2220 10µF 20% 100V X7S
CAP, 1000µF 20% 63V ELEC
CAP, 1210 2.2nF 5% 630V U2J
CAP, 2.2nF 10% Y5B TYPE “Y1”
CAP, 0603 4.7pF ±0.1pF 50V NP0
DIODES, RECTIFIER 1.0A
DIODE, FAST SWITCHING
DIODE, ULTRA FAST RECOVERY SILICON RECTIFIER
DIODE, SUPER BARRIER RECTIFIER 10A
DIODE, RECOVERY RECTIFIER
FUSE, FAST ACTING 3.15A
IND, 10mH COMMON MODE CHOKE
IND, 150µH LINE CHOKE
XSTR, COOL MOS POWER TRANSISTOR
RES, 1206 249k 1% 1/4W
RES, 0603 100k 5% 1/10W
RES, 0603 4.32k 1% 1/10W
RES, 0603 20Ω 5% 1/10W
RES, 2512 200k 5% 1W
RES, 0603 2k 5% 1/10W
RES, 1206 0.015Ω 1% 1/4W
RES, 1206 10k 1% 1/4W
RES, 1206 499k 1% 1/4W
RES, 0603 3.09k 1% 1/10W
RES, 0603 40.2k 1% 1/10W
RES, 0603 16.9k 1% 1/10W
RES, 0603 0Ω JUMPER
RES, 0603 17.8Ω 1% 1/10W
XFMR, FLYBACK
IC, OFFLINE ISOLATED LED CONTROLLER
VARISTOR, 385V RMS 13.5MM RADIAL
DIODE, TRANSIENT VOLTAGE SUPPRESSOR
DIODE, TRANSIENT VOLTAGE SUPPRESSOR
DIODE, TRANSIENT VOLTAGE SUPPRESSOR
MANUFACTURER/PART NUMBER
VISHAY BFC33820474
RUBYCON 450MMK474K
NIC NRSZ220M35V5X11F
AVX 06035C103KAT2A
AVX 06035C104KAT2A
AVX 0805YD475MAT2A
TDK C5750X7S2A106M
PANASONIC EEU-FC1J102
MURATA GRM32A7U2J222JW31D
VISHAY 440LD22-R
AVX 06035A4R7CAT2A
DIODES INC. 1N4005-T
DIODES INC. BAV20W-7-F
CENTRAL SEMI.CMR1U-10M
DIODES INC. SBR10U300CT
CENTRAL SEMI.CMR1U-02M
BUSSMAN SS-5H-3.15A-APH
SUMIDA LF2628NP-103
WÜRTH ELECTRONIK 7447018
INFINEON SPP17N80C3
VISHAY CRCW1206249KFKEA
VISHAY CRCW0603100KJNEA
VISHAY CRCW06034K32FKEA
VISHAY CRCW060320R0JNEA
VISHAY CRCW2512200KJNEG
VISHAY CRCW06032K00JNEA
VISHAY WSL1206R0150FEA
VISHAY CRCW120610K0FKEA
VISHAY CRCW1206499KFKEA
VISHAY CRCW06033K09FKEA
NIC NRC06F4222TRF
VISHAY CRCW060316K9FKEA
VISHAY CRCW06030000Z0EA
VISHAY CRCW060317R8FKEA
WÜRTH ELECTONIK 750811351
LINEAR TECH. LT3799EMSE-1
SEI CV385K10B
DIODES INC. SMBJ130(C)A-13-F
DIODES INC. SMCJ40(C)A-13-F
LITTELFUSE INC. SMCJ220CA
dc1816bfc
Required Circuit Components
5
京公网安备 11010802033920号
EEWORLD
