LT3512 반도체 회로 부품 판매점
Monolithic High Voltage Isolated Flyback Converter
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 Linear Technology |
LT3512
Monolithic High Voltage
Isolated Flyback Converter
FEATURES
n 4.5V to 100V Input Voltage Range
n Internal 420mA, 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 VOUT 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
APPLICATIONS
n Isolated Telecom Power Supplies
n Isolated Auxiliary/Housekeeping Power Supplies
n Isolated Industrial, Automotive and Medical Power
Supplies
DESCRIPTION
The LT3512 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
420mA, 150V power switch, high voltage circuitry, and
control into a high voltage 16-lead MSOP package with
four leads removed.
The LT3512 operates from an input voltage range of 4.5V
to 100V and delivers up to 4.5W 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.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and No RSENSE 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.
TYPICAL APPLICATION
VIN
36V TO 72V
48V to 5V Isolated Flyback Converter
1μF 1M
VIN
EN/UVLO
4:1
175μH
t
11μH
43.2k
LT3512
RFB
RREF
169k
t
10k
TC
VC
SW
GND BIAS
57.6k
12.7k
4.7nF
4.7μF
3512 TA01a
VOUT+
5V
0.5A
47μF
VOUT–
Output Load and Line Regulation
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
0
VIN = 48V
VIN = 36V
VIN = 72V
100 200 300 400
LOAD CURRENT (mA)
500
3512 TA01b
3512f
1
LT3512
ABSOLUTE MAXIMUM RATINGS
(Note 1)
SW (Note 4) ............................................................150V
VIN, EN/UVLO..........................................................100V
RFB............................................................100V, VIN ±6V
BIAS...................................................................VIN, 20V
RREF,TC, VC .................................................................6V
Operating Junction Temperature Range (Note 2)
LT3512E, LT3512I .............................. –40°C to 125°C
LT3512H ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
EN/UVLO 1
TOP VIEW
16 SW
VIN 3
14 RFB
GND 5
BIAS 6
NC 7
GND 8
12 RREF
11 TC
10 VC
9 GND
MS PACKAGE
16(12)-LEAD PLASTIC MSOP
θJA = 90°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3512EMS#PBF
LT3512EMS#TRPBF
3512
16-Lead Plastic MSOP
–40°C to 125°C
LT3512IMS#PBF
LT3512IMS#TRPBF
3512
16-Lead Plastic MSOP
–40°C to 125°C
LT3512HMS#PBF
LT3512HMS#TRPBF
3512
16-Lead Plastic MSOP
–40°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.
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 = 24V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Quiescent Current
EN/UVLO Pin Threshold
VIN = BIAS
Not Switching
VEN/UVLO = 0.2V
EN/UVLO Pin Voltage Rising
l6
4.5
100
15
3.5 4.5
0
l 1.15 1.21 1.27
V
V
mA
μA
V
EN/UVLO Pin Current
Maximum Switching Frequency
VEN/UVLO =1.1V
VEN/UVLO =1.4V
2.0 2.6 3.3
0
650
μA
μA
kHz
Minimum Switching Frequency
40 kHz
Maximum Current Limit
420 600 800
mA
Minimum Current Limit
80 120 150
mA
Switch VCESAT
RREF Voltage
ISW = 200mA
1.18
l 1.17
0.5
1.20 1.215
1.23
V
V
V
RREF Voltage Line Regulation
RREF Pin Bias Current
Error Amplifier Voltage Gain
6V < VIN < 100V
(Note 3)
0.01 0.03
%/V
l
80 400
nA
150 V/V
Error Amplifier Transconductance
∆I = 2μA
140 μmhos
3512f
2
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제조업체: Linear Technology
( linear )
LT3512 converter
데이터시트 다운로드 :
[ LT3512.PDF ]
[ LT3512 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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