900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LT3573 Datasheet

Isolated Flyback Converter Without an Opto-Coupler

No Preview Available !

www.DataSheet4U.com
FEATURES
n 3V to 40V Input Voltage Range
n 1.25A, 60V Integrated NPN Power Switch
n Boundary Mode Operation
n No Transformer Third Winding or
Optoisolator Required for Regulation
n Improved Primary-Side Winding Feedback
Load Regulation
n VOUT Set with Two External Resistors
n BIAS Pin for Internal Bias Supply and Power
NPN Driver
n Programmable Soft-Start
n Programmable Power Switch Current Limit
n Thermally Enhanced 16-Lead MSOP
APPLICATIONS
n Industrial, Automotive, Medical
n Low Power PoE
LT3573
Isolated Flyback Converter
Without an Opto-Coupler
DESCRIPTION
The LT®3573 is a monolithic switching regulator specifi-
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.
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents pending.
TYPICAL APPLICATION
VIN
12V TO 24V
10μF 357k
51.1k
5V Isolated Flyback Converter
VIN
SHDN/UVLO
TC
RILIM
SS
VC
LT3573
RFB
RREF
SW
GND TEST BIAS
0.22μF
1N4148
80.6k
B340A
3:1
2k
24μH
2.6μH
6.04k
28.7k 10k
20k
10nF 1nF
4.7μF
VOUT+
5V, 0.7A
47μF
VOUT–
3573 TA01
Load Regulation
3
2
1
0 VIN = 24V
VIN = 12V
–1
–2
–3
0 200 400 600 800 1000 1200 1400
IOUT (mA)
3573 TA01b
3573f
1


Linear Technology Electronic Components Datasheet

LT3573 Datasheet

Isolated Flyback Converter Without an Opto-Coupler

No Preview Available !

LT3573www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
SW ............................................................................60V
VIN, SHDN/UVLO, RFB, BIAS .....................................40V
SS, VC, TC, RREF, RILIM ...............................................5V
Maximum Junction Temperature........................... 125°C
Operating Junction Temperature Range (Note 2)
LT3573E.............................................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
PIN CONFIGURATION
GND 1
TEST 2
GND 3
SW 4
VIN 5
BIAS 6
SHDN/UVLO 7
GND 8
TOP VIEW
17
16 GND
15 TC
14 RREF
13 RFB
12 VC
11 RILIM
10 SS
9 GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 50°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO GND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3573EMSE#PBF
LT3573EMSE#TRPBF
3573
16-Lead Plastic MSOP
–40°C to 125°C
LT3573IMSE#PBF
LT3573IMSE#TRPBF
3573
16-Lead Plastic MSOP
–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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
l3
40 V
Quiescent Current
Soft-Start Current
SHDN/UVLO Pin Threshold
SHDN/UVLO Pin Hysteresis Current
Soft-Start Threshold
SS = 0V
VSHDN/UVLO = 0V
SS = 0.4V
UVLO Pin Voltage Rising
VUVLO = 1V
3.5
01
7
l 1.15 1.22 1.29
2 2.5 3
0.7
mA
μA
μA
V
μA
V
Maximum Switching Frequency
1000 kHz
Switch Current Limit
Minimum Current Limit
Switch VCESAT
RREF Voltage
RILIM = 10k
VC = 0V
ISW = 0.5A
VIN = 3V
1.25 1.55 1.85
140 200 260
150 250
1.21 1.23 1.25
l 1.20
1.25
A
mA
mV
V
RREF Voltage Line Regulation
RREF Pin Bias Current
IREF Reference Current
3V < VIN < 40V
(Note 3)
Measured at RFB Pin with RREF = 6.49k
0.01 0.03
%/V
l
100 600
nA
190 μA
3573f
2


Part Number LT3573
Description Isolated Flyback Converter Without an Opto-Coupler
Maker Linear Technology
PDF Download

LT3573 Datasheet PDF






Similar Datasheet

1 LT3570 1.5A Boost Converter and LDO Controller
Linear Technology
2 LT3571 75V DC/DC Converter
Linear
3 LT3572 Dual Full-Bridge Piezo Driver
Linear Technology
4 LT3573 Isolated Flyback Converter Without an Opto-Coupler
Linear Technology
5 LT3574 Isolated Flyback Converter Without an Opto-Coupler
Linear Technology
6 LT3575 Isolated Flyback Converter
Linear Technology
7 LT3579 DC/DC Converter
Linear Technology
8 LT3579-1 DC/DC Converter
Linear Technology





Part Number Start With

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



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy