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Linear Technology Electronic Components Datasheet

LT3575 Datasheet

Isolated Flyback Converter

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DataSheet.in
FEATURES
n 3V to 40V Input Voltage Range
n 2.5A, 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 TSSOP
APPLICATIONS
n Industrial, Automotive and Medical Isolated
Power Supplies
LT3575
Isolated Flyback Converter
without an Opto-Coupler
DESCRIPTION
The LT®3575 is a monolithic switching regulator specific-
ally 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 2.5A, 60V NPN power
switch is integrated along with all control logic into a
16-lead TSSOP package.
The LT3575 operates with input supply voltages from
3V to 40V, and can deliver output power up to 14W with
no external power switch.The LT3575 utilizes boundary
mode operation to provide a small magnetic solution with
improved load regulation.
The output voltage is easily set with two external resistors
and the transformer turns ratio. Off the shelf transformers
are available for many applications.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and No RSENSE and ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V Isolated Flyback Converter
VIN
12V TO 24V
10μF
357k
51.1k
VIN
SHDN/UVLO
0.22μF 1k 3:1
24μH
2.6μH
TC
RILIM
SS
VC
LT3575
RFB
RREF
80.6k
SW
GND TEST BIAS
6.04k
28.7k 10k
11.5k
10nF 4.7nF
4.7μF
3575 TA01
VOUT+
5V, 1.4A
47μF
VOUT–
Load Regulation
1
VIN = 24V
0
VIN = 12V
–1
–2
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
IOUT (A)
3575 TA01b
3575f
1


Linear Technology Electronic Components Datasheet

LT3575 Datasheet

Isolated Flyback Converter

No Preview Available !

DataSheet.in
LT3575
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)
LT3575E, LT3575I.............................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
NC
VIN
SW
SW
BIAS
SHDN/UVLO
SS
RILIM
1
2
3
4
5
6
7
8
16 NC
15 NC
14 GND
17 13 TEST
GND 12 TC
11 RREF
10 RFB
9 VC
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°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
LT3575EFE#PBF
LT3575EFE#TRPBF
3575FE
16-Lead Plastic TSSOP
–40°C to 125°C
LT3575IFE#PBF
LT3575IFE#TRPBF
3575FE
16-Lead Plastic TSSOP
–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
Input Voltage Range
Quiescent Current
Soft-Start Current
SHDN/UVLO Pin Threshold
SHDN/UVLO Pin Hysteresis Current
Soft-Start Threshold
Maximum Switching Frequency
Switch Current Limit
Minimum Current Limit
Switch VCESAT
RREF Voltage
RREF Voltage Line Regulation
RREF Pin Bias Current
CONDITIONS
SS = 0V
VSHDN/UVLO = 0V
SS = 0.4V
UVLO Pin Voltage Rising
VUVLO = 1V
RILIM = 10k
VC = 0V
ISW = 0.5A
VIN = 3V
3V < VIN < 40V
(Note 3)
MIN TYP MAX UNITS
l3
40 V
4.5
01
mA
μA
7 μA
l 1.15 1.22 1.32
V
2.2 2.8 3.2
μA
0.7 V
1000 kHz
2.8 3.5 4.2
A
400 mA
75 125
mV
1.21 1.23 1.25
l 1.20
1.26
V
0.01 0.03
%/V
l
100 600
nA
3575f
2


Part Number LT3575
Description Isolated Flyback Converter
Maker Linear Technology
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LT3575 Datasheet PDF






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