LT8300E 查看數據表（PDF） - Analog Devices
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LT8300E Datasheet PDF : 24 Pages
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LT8300
100VIN Micropower Isolated Flyback
Converter with 150V/260mA Switch
FEATURES
nn 6V to 100V Input Voltage Range
nn 260mA, 150V Internal DMOS Power Switch
nn Low Quiescent Current
nn 70µA in Sleep Mode
nn 330µA in Active Mode
nn Boundary Mode Operation at Heavy Load
nn Low-Ripple Burst Mode® Operation at Light Load
nn Minimum Load <0.5% (Typ) of Full Output
nn VOUT Set with a Single External Resistor
nn No Transformer Third Winding or Opto-Isolator
Required for Regulation
nn Accurate EN/UVLO Threshold and Hysteresis
nn Internal Compensation and Soft-Start
nn 5-Lead TSOT-23 Package
nn AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
nn Isolated Telecom, Automotive, Industrial, Medical
Power Supplies
nn Isolated Auxiliary/Housekeeping Power Supplies
DESCRIPTION
The LT®8300 is a micropower high voltage isolated fly-
back converter. By sampling the isolated output voltage
directly from the primary-side flyback waveform, the part
requires no third winding or opto-isolator for regulation.
The output voltage is programmed with a single exter-
nal resistor. Internal compensation and soft-start further
reduce external component count. Boundary mode opera-
tion provides a small magnetic solution with excellent load
regulation. Low ripple Burst Mode operation maintains
high efficiency at light load while minimizing the output
voltage ripple. A 260mA, 150V DMOS power switch is
integrated along with all high voltage circuitry and control
logic into a 5-lead ThinSOT™ package.
The LT8300 operates from an input voltages range of 6V
to 100V and can deliver up to 2W of isolated output power.
The high level of integration and the use of boundary
and low ripple burst modes result in a simple to use, low
component count, and high efficiency application solution
for isolated power delivery.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 5438499, 7463497, and 7471522.
TYPICAL APPLICATION
5V Micropower Isolated Flyback Converter
VIN
36V TO 72V
2.2µF
1M
VIN
LT8300
EN/UVLO
4:1
•
300µH
19µH
•
SW
40.2k
GND
RFB
8300 TA01a
210k
VOUT+
5V
1mA TO 300mA
47µF
VOUT–
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Load Current
VIN = 36V
VIN = 72V VIN = 48V
50 100 150 200 250 300
LOAD CURRENT (mA)
8300 TA01b
Rev. A
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