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LT3511IMS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT3511
1
3511fc
TYPICAL APPLICATION
FEATURES DESCRIPTION
Monolithic High Voltage
Isolated Flyback Converter
The LT
®
3511 is a high voltage monolithic switching regula-
tor specifically designed for the isolated flyback topology.
No third winding or opto-isolator is required for regula-
tion as the part senses output voltage directly from the
primary-side flyback waveform. The device integrates a
240mA, 150V power switch, high voltage circuitry, and
control into a high voltage 16-lead MSOP package with
four leads removed.
The LT3511 operates from an input voltage range of 4.5V
to 100V and delivers up to 2.5W of isolated output power.
Two external resistors and the transformer turns ratio
easily set the output voltage. Off-the-shelf transformers
are available for several applications. The high level of
integration and the use of boundary mode operation results
in a simple, clean, tightly regulated application solution to
the traditionally tough problem of isolated power delivery.
Output Load and Line Regulation48V to 5V Isolated Flyback Converter
APPLICATIONS
n
4.5V to 100V Input Voltage Range
n
Internal 240mA, 150V Power Switch
n
Boundary Mode Operation
n
No Transformer Third Winding or
Opto-Isolator 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
Switch Driver
n
No External Start-Up Resistor
n
16-Lead MSOP Package
n
Isolated Telecom Power Supplies
n
Isolated Auxiliary/Housekeeping Power Supplies
n
Isolated Industrial, Automotive and Medical Power
Supplies
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and No R
SENSE
is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522.
EN/UVLO
T
C
R
FB
R
REF
SW
VC GND BIAS
LT3511
3511 TA01a
69.8k
16.9k
V
IN
36V TO 72V
V
OUT
+
5V
0.3A
V
OUT
–
4:1
1M
1µF
43.2k
19µH300µH
22µF
3.3nF
4.7µF
10k
169k
t
t
V
IN
LOAD CURRENT (mA)
0
4.75
V
OUT
(V)
4.85
4.95
5.05
50
100
150 200
3511 TA01b
250
5.15
5.25
4.80
4.90
5.00
5.10
5.20
300
V
IN
= 36V
V
IN
= 72V
V
IN
= 48V
LT3511
2
3511fc
ABSOLUTE MAXIMUM RATINGS
SW (Note 4) ............................................................150V
V
IN
, EN/UVLO, R
FB
..................................................100V
V
IN
to R
FB
.................................................................. ±6V
BIAS ................................................Lesser of 20V or V
IN
R
REF
, T
C
, VC ................................................................6V
Operating Junction Temperature Range (Note 2)
LT3511E, LT3511I ............................... –40°C to 125°C
LT3511H .............................................–40°C to 150°C
LT3511MP .......................................... –55°C to 150°C
Storage Temperature Range ..................–65°C to 150°C
(Note 1)
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V unless otherwise noted.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3511EMS#PBF LT3511EMS#TRPBF 3511 16-Lead Plastic MSOP –40°C to 125°C
LT3511IMS#PBF LT3511IMS#TRPBF 3511 16-Lead Plastic MSOP –40°C to 125°C
LT3511HMS#PBF LT3511HMS#TRPBF 3511 16-Lead Plastic MSOP –40°C to 150°C
LT3511MPMS#PBF LT3511MPMS#TRPBF 3511 16-Lead Plastic MSOP –55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
PIN CONFIGURATION
1
3
5
6
7
8
EN/UVLO
V
IN
GND
BIAS
NC
GND
16
14
12
11
10
9
SW
R
FB
R
REF
T
C
VC
GND
TOP VIEW
MS PACKAGE
16(12)-LEAD PLASTIC MSOP
θ
JA
= 90°C/W
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range
V
IN
= BIAS
l
6
4.5
100
15
V
V
Quiescent Current Not Switching
V
EN/UVLO
= 0.2V
2.7
0
3.5 mA
µA
EN/UVLO Pin Threshold EN/UVLO Pin Voltage Rising
l
1.15 1.21 1.27 V
EN/UVLO Pin Current V
EN/UVLO
= 1.1V
V
EN/UVLO
= 1.4V
2.0 2.6
0
3.3 µA
µA
Maximum Switching Frequency 650 kHz
Maximum Current Limit 240 330 430 mA
Minimum Current Limit 35 60 90 mA
Switch V
CESAT
I
SW
= 100mA 0.3 V
R
REF
Voltage
l
1.18
1.17
1.20 1.215
1.23
V
V
R
REF
Voltage Line Regulation 6V < V
IN
< 100V 0.01 0.03 %/V
R
REF
Pin Bias Current (Note 3)
l
80 400 nA
Error Amplifier Voltage Gain 150 V/V
Error Amplifier Transconductance ∆I = 2µA 140 µmhos
LT3511
3
3511fc
ELECTRICAL CHARACTERISTICS
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 LT3511E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3511I is guaranteed to meet performance specifications from –40°C to
125°C operating junction temperature range. The LT3511H is guaranteed
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Switching Frequency 40 kHz
T
C
Current into R
REF
R
TC
= 53.6k 9.5 µA
BIAS Pin Voltage Internally Regulated 3 3.1 3.2 V
to meet performance specifications from –40°C to 150°C operating
junction temperature range. The LT3511MP is guaranteed over the full
–55°C to 150°C operating junction range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3: Current flows out of the R
REF
pin.
Note 4: The SW pin is rated to 150V for transients. Operating waveforms
of the SW pin should keep the pedestal of the flyback waveform below
100V as shown in Figure 5.
TYPICAL PERFORMANCE CHARACTERISTICS
Switch V
CESAT
Switch Current Limit Quiescent Current vs V
IN
Output Voltage Quiescent Current BIAS Pin Voltage
TEMPERATURE (°C)
–50
4.75
V
OUT
(V)
4.80
4.90
4.95
5.00
5.25
5.10
0
50
75
3511 G01
4.85
5.15
5.20
5.05
–25 25
100
125
150
V
IN
= 48V
TEMPERATURE (°C)
–50 –25
0
I
Q
(mA)
2
5
0
50
75
3511 G02
1
4
3
25
100
125 150
V
IN
= 24V
V
IN
= 48V
V
IN
= 100V
TEMPERATURE (°C)
–50
2.0
BIAS VOLTAGE (V)
2.5
3.0
3.5
4.0
–25 0 25 50
3511 G03
52105100157
V
IN
= 24V, 10mA
V
IN
= 24V, NO LOAD
SWITCH CURRENT (mA)
050
0
SWITCH V
CESAT
VOLTAGE (mV)
400
1000
100
200
250
3511 G04
200
800
600
150
300
350
TEMPERATURE (°C)
–50
CURRENT LIMIT (mA)
350
25
3511 G05
200
100
–25 0 50
50
0
400
300
250
150
52105100157
MINIMUM CURRENT LIMIT
MAXIMUM CURRENT LIMIT
VOLTAGE (V)
0
I
Q
(mA)
2
3
80
3511 G06
1
0
20
40
60
100
4
T
A
= 25°C, unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LT3511IMS#TRPBF

Mfr. #:
Buy LT3511IMS#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Mono Hi V Iso Fly Conv
Lifecycle:
New from this manufacturer.
Delivery:
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