LT8300_15 Datasheet, PDF (1/24 Pages) Linear Technology – 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch

Features
n _{6V to 100V Input Voltage Range}
n _{260mA, 150V Internal DMOS Power Switch}
n _{Low Quiescent Current:}
70µA in Sleep Mode
330µA in Active Mode
n _{Boundary Mode Operation at Heavy Load}
n _{Low-Ripple Burst Mode}^® _{Operation at Light Load}
n _{Minimum Load <0.5% (Typ) of Full Output}
n _{VOUT Set with a Single External Resistor}
n _{No Transformer Third Winding or Opto-Isolator}
Required for Regulation
n _{Accurate EN/UVLO Threshold and Hysteresis}
n _{Internal Compensation and Soft-Start}
n _{5-Lead TSOT-23 Package}
Applications
n _{Isolated Telecom, Automotive, Industrial, Medical}
Power Supplies
n _{Isolated Auxiliary/Housekeeping Power Supplies}
LT8300
100V_IN Micropower Isolated
Flyback Converter with
150V/260mA Switch
Description
The LT^®8300 is a micropower high voltage isolated flyback
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 external resistor. In-
ternal compensation and soft-start further reduce external
component count. Boundary mode operation 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.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other 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
V_IN
36V TO 72V
2.2µF
1M
V_IN
LT8300
EN/UVLO
4:1
•
300µH
19µH
•
SW
40.2k
GND
R_FB
8300 TA01a
210k
V_OUT+
5V
1mA TO 300mA
47µF
V_OUT–
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Load Current
V_IN = 36V
V_IN = 72V ^{VIN = 48V}
50 100 150 200 250 300
LOAD CURRENT (mA)
8300 TA01b
8300f
1