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Linear Technology Electronic Components Datasheet

LT3748 Datasheet

100V Isolated Flyback Controller

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Features
nn 5V to 100V Input Voltage Range
nn 1.9A Average Gate Drive Source and Sink Current
nn Boundary Mode Operation
nn No Transformer Third Winding or Opto-Isolator
Required for Regulation
nn Primary-Side Winding Feedback Load Regulation
nn VOUT Set with Two External Resistors
nn INTVCC Pin for Control of Gate Driver Voltage
nn Programmable Soft Start
nn Programmable Undervoltage Lockout
nn Available in MSOP Package
Applications
nn Isolated Telecom Converters
nn High Power Automotive Supplies
nn Isolated Industrial Power Supplies
nn Military and High Temperature Applications
LT3748
100V Isolated
Flyback Controller
Description
The LT®3748 is a switching regulator controller specifically
designed for the isolated flyback topology and capable of
high power. It drives a low side external N-channel power
MOSFET from an internally regulated 7V supply. No third
winding or opto-isolator is required for regulation as the
part senses the isolated output voltage directly from the
primary-side flyback waveform.
The LT3748 utilizes boundary mode to provide a small
magnetic solution without compromising load regulation.
Operating frequency is set by load current and transformer
magnetizing inductance. The gate drive of the LT3748
combined with a suitable external MOSFET allow it to
deliver load power up to several tens of watts from input
voltages as high as 100V.
The LT3748 is available in a high voltage 16-lead MSOP
package with four leads removed.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5438499 and 7471522.
Typical Application
25W, 12V Output, Isolated Telecom Supply
VIN
36V TO 72V
4:1
10µF
412k
EN/UVLO VIN
15.4k
LT3748
RFB
RREF
60.8µH
243k
6.04k
3.8µH
56.2k
TC GATE
SS SENSE
VC GND INTVCC
2nF 10k
4700pF
4.7µF
0.033Ω
3748 TA01a
VOUT+
12V
2A
100µF
VOUT–
Output Load and Line Regulation
12.6
12.4
12.2
12.0
11.8
11.6
11.4
0
VIN = 72V
VIN = 48V
VIN = 36V
0.5 1.0 1.5
LOAD CURRENT (A)
2.0
3748 TA01b
For more information www.linear.com/LT3748
3748fb
1


Linear Technology Electronic Components Datasheet

LT3748 Datasheet

100V Isolated Flyback Controller

No Preview Available !

LT3748
Absolute Maximum Ratings
(Note 1)
VIN, RFB....................................................................100V
VIN to RFB...................................................................±5V
EN/UVLO.......................................................–0.3V, 100V
INTVCC.....................................................VIN + 0.3V, 20V
SS, VC, TC, RREF..........................................................6V
SENSE....................................................................... 0.4V
Operating Junction Temperature Range (Note 2)
LT3748E/LT3748I................................ –40°C to 125°C
LT3748H............................................. –40°C to 150°C
LT3748MP.......................................... –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
VIN 1
TOP VIEW
16 RFB
EN/UVLO 3
14 RREF
INGTVATCEC
5
6
SENSE 7
GND 8
12 TC
11
10
VSCS
9 GND
MS PACKAGE
16 (12)-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 90°C/W
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3748EMS#PBF
LT3748EMS#TRPBF
3748
16-Lead Plastic MSOP
–40°C to 125°C
LT3748IMS#PBF
LT3748IMS#TRPBF
3748
16-Lead Plastic MSOP
–40°C to 125°C
LT3748HMS#PBF
LT3748HMS#TRPBF
3748
16-Lead Plastic MSOP
–40°C to 150°C
LT3748MPMS#PBF
LT3748MPMS#TRPBF 3748
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.
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/
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
l5
100 V
Quiescent Current
Not Switching
VEN/UVLO = 0.2V
1.3 1.75 mA
0 1 µA
VIN Quiescent Current, INTVCC Overdriven VINTVCC = 10V
300 450 µA
INTVCC Voltage Range
l 4.5
20 V
INTVCC Pin Regulation Voltage
6.8 7 7.2 V
INTVCC Dropout
(VIN – VINTVCC), IINTVCC = 10mA, VIN = 5V
0.7
V
INTVCC Undervoltage Lockout
Falling Threshold
l 3.45 3.6 3.75
V
EN/UVLO Pin Threshold
EN/UVLO Pin Voltage Rising
l 1.19
1.223
1.25
V
EN/UVLO Pin Hysteresis Current
EN/UVLO = 1V
1.9 2.4 2.9 µA
Soft-Start Current
Soft-Start Threshold
VSS = 0.4V (Note 3)
5 µA
0.65 V
Soft-Start Reset Current
3 mA
3748fb
2 For more information www.linear.com/LT3748


Part Number LT3748
Description 100V Isolated Flyback Controller
Maker Linear Technology
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LT3748 Datasheet PDF






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