LT3573EMSEPBF LINER [Linear Technology], LT3573EMSEPBF Datasheet
LT3573EMSEPBF
Manufacturer Part Number
LT3573EMSEPBF
Description
Isolated Flyback Converter without an Opto-Coupler
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT3573EMSEPBF.pdf
(26 pages)
Features
applications
n
n
n
n
n
n
n
n
n
n
n
typical application
V
12V TO 24V
IN
3V to 40V Input Voltage Range
1.25A, 60V Integrated NPN Power Switch
Boundary Mode Operation
No Transformer Third Winding or
Optoisolator Required for Regulation
Improved Primary-Side Winding Feedback
Load Regulation
V
BIAS Pin for Internal Bias Supply and Power
NPN Driver
Programmable Soft‑Start
Programmable Power Switch Current Limit
Thermally Enhanced 16‑Lead MSOP
Industrial, Automotive and Medical Isolated
Power Supplies
28.7k
OUT
10
µ
F
Set with Two External Resistors
10k
357k
51.1k
10nF
SHDN/UVLO
TC
R
SS
ILIM
VC
5V Isolated Flyback Converter
20k
1nF
GND
LT3573
V
IN
TEST BIAS
3573 TA01
R
R
SW
REF
FB
4.7
µ
F
80.6k
1N4148
0.22
µ
F
2k
6.04k
24
µ
H
3:1
2.6
Isolated Flyback Converter
Description
The LT
cally designed for the isolated flyback topology. No third
winding or optoisolator is required for regulation. The
part senses the isolated output voltage directly from the
primary side flyback waveform. A 1.25A, 60V NPN power
switch is integrated along with all control logic into a
16‑lead MSOP package.
The LT3573 operates with input supply voltages from
3V to 40V, and can deliver output power up to 7W with
no external power devices.The LT3573 utilizes boundary
mode operation to provide a small magnetic solution with
improved load regulation.
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.
Patents pending.
B340A
µ
H
without an Opto-Coupler
®
47
3573 is a monolithic switching regulator specifi‑
V
5V, 0.7A
V
OUT
µ
OUT
F
+
–
–1
–2
–3
3
2
1
0
0
200
Load Regulation
400
V
IN
= 12V
600
I
OUT
(mA)
800
LT3573
1000 1200 1400
V
IN
= 24V
3573 TA01b
3573fb
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