LT3799 Datasheet PDF - Linear Technology

www.Datasheet-PDF.com

LT3799
Linear Technology

Part Number LT3799
Description Offline Isolated Flyback LED Controller
Page 20 Pages


LT3799 datasheet pdf
Download PDF
LT3799 pdf
View PDF for Mobile


No Preview Available !

www.DataSheet.co.kr
Electrical Specifications Subject to Change
LT3799
Offline Isolated Flyback
LED Controller with Active PFC
FEATURES
n Isolated PFC LED Driver with Minimum Number of
External Components
n TRIAC Dimmable
n VIN and VOUT Limited Only by External Components
n Active Power Factor Correction (Typical PFC > 0.97)
n Low Harmonic Content
n No Opto-Coupler Required
n Accurate Regulated LED Current (±5% Typical)
n Open LED and Shorted LED Protection
n Thermally Enhanced 16-lead MSOP Package
APPLICATIONS
n Offline 4W to 100W+ LED Applications
n High DC VIN LED Applications
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patents pending.
DESCRIPTION
The LT®3799 is an isolated flyback controller with power
factor correction specifically designed for driving LEDs.
The controller operates using critical conduction mode
allowing the use of a small transformer. Using a novel
current sensing scheme, the controller is able to deliver a
well regulated current to the secondary side without using
an opto-coupler. A strong gate driver is included to drive
an external high voltage MOSFET. Utilizing an onboard
multiplier, the LT3799 typically achieves power factors
of 0.97. The FAULT pin provides notification of open and
short LED conditions.
The LT3799 uses a micropower hysteretic start-up to
efficiently operate at offline input voltages, with a third
winding to provide power to the part. An internal LDO
provides a well regulated supply for the part’s internal
circuitry and gate driver.
TYPICAL APPLICATION
90V
TO 150V
AC
0.1µF
100k
FAULT
TRIAC Dimmable 20W LED Driver
0.22µF
200Ω
499k
499k
100k
100k
20Ω
4.7pF
10µF
2k
6.34k
VIN
VIN_SENSE
LT3799
DCM
FB
100k
4.99k
32.4k 40.2k
100k
NTC 16.2k
VREF
CTRL3
CTRL2
CTRL1
GATE
SENSE
VINTVCC
GND
FAULT CT COMP+ COMP
0.1µF
0.1µF
20Ω
4.7µF
4:1:1
1A
560µF
×2
0.05Ω
2.2nF
20W
LED
POWER
3799 TA01a
LED Current vs Input Voltage
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
90 100 110 120 130 140 150
VIN (VAC)
3799 TA01b
3799p
1
Datasheet pdf - http://www.DataSheet4U.net/



No Preview Available !

www.DataSheet.co.kr
LT3799
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, FAULT..................................................................32V
GCFBTA,RTCELT1,,,INVCTRTEVRFCL, CC2.O,..C.M..T.P.R.+.L,....3....,....V....I..N...._....S....E..N....S....E....,....C....O......M......P.....................................................1..834VVV
SENSE....................................................................... 0.4V
DCM........................................................................±3mA
Maximum Junction Temperature........................... 125°C
Operating Temperature Range (Note 2)
LT3799E............................................. –40°C to 125°C
LT3799I.............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
CTRL1 1
CTRL2 2
16
15
VIN_SENSE
SENSE
CTRL3 3
14 GATE
VREF 4
FAULT 5
17
GND
13
12
INNCTVCC
CCOOMMCPPT+–
6
7
8
11
10
VDICNM
9 FB
MSE PACKAGE
16-LEAD PLASTIC MSOP
θJA = 50°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3799EMSE#PBF
LT3799EMSE#TRPBF
3799
16-Lead Plastic MSOPE
–40°C to 125°C
LT3799IMSE#PBF
LT3799IMSE#TRPBF
3799
16-Lead Plastic MSOPE
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 18V, INTVCC = 11V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Turn-On Voltage
VIN Turn-Off Voltage
VIN Hysteresis
VIN Shunt Regulator Voltage
VIN Shunt Regulator Current Limit
VIN Quiescent Current
VTURNON – VTURNOFF
I = 1mA
Before Turn-On
After Turn-On
22.2 23 24.2
11.8 12.3 13.0
10.7
25.0
15
55 65 75
70
V
V
V
V
mA
µA
µA
INTVCC Quiescent Current
Before Turn-On
After Turn-On
12 16 20.0
1.5 1.2 2.6
µA
mA
VIN_SENSE Threshold
VIN_SENSE Linear Range
VREF Voltage
Turn-Off
0µA Load
200µA Load
30
0
l 1.975
l 1.9555
65
2
1.98
90
1.3
2.02
2.02
mV
V
V
V
Error Amplifier Voltage Gain
Error Amplifier Transconductance
∆VCOMP+/∆VCOMP–, CTRL1 = 1V, CTRL2 = 2V, CTRL3 = 2V
∆I = 5µA
100 V/V
50 µmhos
2
3799p
Datasheet pdf - http://www.DataSheet4U.net/



No Preview Available !

www.DataSheet.co.kr
LT3799
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 18V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
FB Pin Bias Current
(Note 3), FB = 1V
100 600
nA
CTRL1/CTRL2/CTRL3 Pin Bias Current
CTRL/CTRL2/CTRL3 = 1V
±30 nA
SENSE Current Limit Threshold
96 100 106
mV
SENSE Input Bias Current
Current Loop Voltage Gain
CT Pin Charge Current
Current Out of Pin, SENSE = 0V
∆VCTRL/∆VSENSE, 1000pF Cap from COMP+ to COMP
15 µA
21 V/V
10 µA
CT Pin Discharge Current
200 nA
CT Pin Low Threshold
Falling Threshold
240 mV
CT Pin High Threshold
Rising Threshold
1.25 V
CT Pin Low Hysteresis
100 mV
FB Pin High Threshold
1.22 1.25 1.29
V
DCM Current Turn-On Threshold
Maximum Oscillator Frequency
Minimum Oscillator Frequency
Back-Up Oscillator Frequency
Current Out of Pin
COMP+ = 1.2V, VIN_SENSE = 1V
COMP+ = 0V, VIN_SENSE
45 µA
300 kHz
25 kHz
20 kHz
Linear Regulator
INTVCC Regulation Voltage
Dropout (VIN – INTVCC)
Current Limit
INTVCC = –10mA
Below Undervoltage Threshold
9.8 10 10.4
500 900
17 25
V
mV
mA
Current Limit
Above Undervoltage Threshold
80 120
mA
Gate Driver
tr GATE Driver Output Rise Time
tf GATE Driver Output Fall Time
GATE Output Low (VOL)
GATE Output High (VOH)
CL = 3300pF, 10% to 90%
CL = 3300pF, 90% to 10%
20
20
INTVCC
– 0.05
0.05
ns
ns
V
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3799E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3799I is guaranteed to meet performance specifications from –40°C to
125°C operating junction temperature.
Note 3: Current flows out of the FB pin.
3799p
3
Datasheet pdf - http://www.DataSheet4U.net/



No Preview Available !

www.DataSheet.co.kr
LT3799
TYPICAL PERFORMANCE CHARACTERISTICS
VvsINTSetmarpte-UraptuVroeltage
24.0
23.5
23.0
22.5
22.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G01
VREF vs Temperature
2.100
2.075
2.050
2.025
2.000
NO LOAD
1.975
1.950
200µA LOAD
1.925
1.900
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G05
VIN IQ vs Temperature
140
120
100
80 VIN = 24V
VIN = 12V
60
40
20
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G02
VREF vs VIN
2.100
2.075
2.050
2.025
2.000
1.975
1.950
NO LOAD
200µA LOAD
1.925
1.900
14 16 18 20 22 24 26 28 30 32
VIN (V)
3799 G05
Input Voltage Hysteresis
vs Temperature
12.0
11.6
11.2
10.8
10.4
10.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G03
SENSE Pin Threshold Current
vs Temperature
120
MAX ILIM
100
80
60
40
20 MIN ILIM
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G06
Maximum Oscillator Frequency
vs Temperature
375
350
325
300
275
250
225
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G07
Minimum Oscillator Frequency
vs Temperature
70
60
50
40
30
20
10
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3799 G08
4
3799p
Datasheet pdf - http://www.DataSheet4U.net/



LT3799 datasheet pdf
Download PDF
LT3799 pdf
View PDF for Mobile


Related : Start with LT379 Part Numbers by
LT3790 60V Synchronous 4-Switch Buck-Boost Controller LT3790
Linear
LT3790 pdf
LT3791 60V 4-Switch Synchronous Buck-Boost LED Driver Controller LT3791
Linear Technology
LT3791 pdf
LT3791-1 60V 4-Switch Synchronous Buck-Boost Controller LT3791-1
Linear Technology
LT3791-1 pdf
LT3795 110V LED Controller LT3795
Linear Technology
LT3795 pdf
LT3796 100V Constant-Current and Constant-Voltage Controller LT3796
Linear Technology
LT3796 pdf
LT3797 Triple Output LED Driver Controller LT3797
Linear
LT3797 pdf
LT3798 Isolated No Opto-Coupler Flyback Controller LT3798
Linear Technology
LT3798 pdf
LT3799 Offline Isolated Flyback LED Controller LT3799
Linear Technology
LT3799 pdf

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   

This is a individually operated, non profit site. If this site is good enough to show, please introduce this site to others.
Since 2010   ::   HOME   ::   Contact