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LT3575IFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3575
1
3575f
FEATURES
APPLICATIONS
DESCRIPTION
Isolated Flyback Converter
without an Opto-Coupler
The LT
®
3575 is a monolithic switching regulator specifi c-
ally designed for the isolated fl yback topology. No third
winding or optoisolator is required for regulation. The
part senses the isolated output voltage directly from the
primary side fl yback 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.
5V Isolated Flyback Converter
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
V
OUT
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
n
Industrial, Automotive and Medical Isolated
Power Supplies
Load Regulation
SHDN/UVLO
TC
R
ILIM
SS
R
FB
R
REF
SW
VC GND TEST BIAS
LT3575
3575 TA01
28.7k
10k
11.5k
V
IN
12V TO 24V
V
IN
357k
51.1k
10μF 0.22μF1k
24
μH
10nF
4.7nF
4.7μF
6.04k
80.6k
V
OUT
+
5V, 1.4A
V
OUT
–
3:1
2.6
μH47μF
I
OUT
(A)
0
OUTPUT VOLTAGE ERROR (%)
0
–1
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
2.0
–2
1
3575 TA01b
V
IN
= 12V
V
IN
= 24V
TYPICAL APPLICATION
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.
LT3575
2
3575f
ABSOLUTE MAXIMUM RATINGS
SW ............................................................................60V
V
IN
, SHDN/UVLO, R
FB
, BIAS .....................................40V
SS, V
C
, TC, R
REF
, R
ILIM
..............................................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
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, unless otherwise noted.
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 specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range
l
340V
Quiescent Current SS = 0V
V
SHDN/UVLO
= 0V
4.5
01
mA
μA
Soft-Start Current SS = 0.4V 7 μA
SHDN/UVLO Pin Threshold UVLO Pin Voltage Rising
l
1.15 1.22 1.32 V
SHDN/UVLO Pin Hysteresis Current V
UVLO
= 1V 2.2 2.8 3.2 μA
Soft-Start Threshold 0.7 V
Maximum Switching Frequency 1000 kHz
Switch Current Limit R
ILIM
= 10k 2.8 3.5 4.2 A
Minimum Current Limit V
C
= 0V 400 mA
Switch V
CESAT
I
SW
= 0.5A 75 125 mV
R
REF
Voltage V
IN
= 3V
l
1.21
1.20
1.23 1.25
1.26
V
R
REF
Voltage Line Regulation 3V < V
IN
< 40V 0.01 0.03 %/ V
R
REF
Pin Bias Current (Note 3)
l
100 600 nA
PIN CONFIGURATION
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
NC
GND
TEST
TC
R
REF
R
FB
V
C
NC
V
IN
SW
SW
BIAS
SHDN/UVLO
SS
R
ILIM
17
GND
T
JMAX
= 125°C, θ
JA
= 38°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO GND
LT3575
3
3575f
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3575E is guaranteed to meet performance specifi cations
from 0°C to 125°C junction temperature. Specifi cations over the –40°C
to 125°C operating junction temperature range are assured by design
characterization and correlation with statistical process controls. The
LT3575I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Current fl ows out of the R
REF
pin.
PARAMETER CONDITIONS MIN TYP MAX UNITS
I
REF
Reference Current Measured at R
FB
Pin with R
REF
= 6.49k 190 μA
Error Amplifi er Voltage Gain V
IN
= 3V 150 V/V
Error Amplifi er Transconductance
ΔI = 10μA, V
IN
= 3V
150 μmhos
Minimum Switching Frequency V
C
= 0.35V 40 kHz
TC Current into R
REF
R
TC
= 20.1k 27.5 μA
BIAS Pin Voltage I
BIAS
= 30mA 2.9 3 3.1 V
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Quiescent Current
Bias Pin Voltage
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
4.80
V
OUT
(V)
4.85
4.95
5.00
5.05
5.20
5.15
0
50
75
4.90
5.10
–25
25
100
125
3575 G01
TEMPERATURE (°C)
–50
0
I
Q
(mA)
2
3
4
8
6
7
0
50
75
1
5
–25
25
100
125
3575 G02
V
IN
= 40V WITH BIAS = 20V
V
IN
= 5V WITH BIAS = 5V
TEMPERATURE (°C)
–50
2.0
BIAS VOLTAGE (V)
2.4
2.6
2.8
3.2
0
50
75
2.2
3.0
–25
25
100
125
3575 G03
V
IN
= 40V
V
IN
= 12V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT3575IFE#TRPBF

Mfr. #:
Buy LT3575IFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Iso Fly Conv w/out an Opto-Coupler
Lifecycle:
New from this manufacturer.
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