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X-11181-002 Datasheet(PDF) 1 Page - Linear Technology

Part No. X-11181-002
Description  Isolated No Opto-Coupler Flyback Controller
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT3798
1
3798f
n Isolated PFC Flyback with Minimum Number of
External Components
n VIN and VOUT Limited Only by External Components
n Active Power Factor Correction
n Low Harmonic Distortion
n No Opto-Coupler Required
n Constant-Current and Constant-Voltage Regulation
n Accurate Regulated Voltage and Current (±5% Typical)
n Energy Star Compliant (<0.5W No Load Operation)
n Thermally Enhanced 16-lead MSOP Package
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Isolated No Opto-Coupler
Flyback Controller
with Active PFC
The LT®3798 is a constant-voltage/constant-current iso-
lated flyback controller that combines active power factor
correction (PFC) with no opto-coupler required for output
voltage feedback into a single-stage converter. A LT3798
based design can achieve a power factor of greater than 0.97
by actively modulating the input current, allowing compli-
ance with most Harmonic Current Emission requirements.
The LT3798 is well suited for a wide variety of off-line
applications. The input range can be scaled up or down,
depending mainly on the choice of external components.
Efficiencies higher than 86% can be achieved with output
power levels up to 100W. In addition, the LT3798 can easily
be designed into high DC input applications.
Universal Input 24W PFC Bus Converter
VOUT vs IOUT
APPLICATIONS
n Offline 5W to 100W+ Applications
n High DC VIN Isolated Applications
n Offline Bus Converter (12V, 24V or 48V Outputs)
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.
Protected by U.S. Patents, including 5438499 and 7471522.
3798 TA01a
VIN_SENSE
EN/UVLO
VIN
DCM
FB
VREF
CTRL2
CTRL1
OVP
GATE
SENSE
INTVCC
GND
LT3798
COMP+
VC
COMP
560μ
F
×
2
4.7pF
10μ
F
2.2nF
4:1:1
2.2μF
0.1μF
20Ω
20Ω
0.05Ω
499k
499k
95.3k
1M
D2
Z1
Z2
D1
D4
22pF
D3
100k
100k
4.99k
90.9k
CTRL3
90V
TO 265V
AC
0.1μF
40.2k
100k
16.5k
221k
4.7μF
2k
24V
1A
IOUT (A)
0
23.50
24.25
24.00
23.75
24.50
0.6
0.8
1
0.2
0.4
3798 TA01b
VAC = 265V
VAC = 220V
VAC = 120V
VAC = 90V




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