Datasheet LT3511 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Monolithic High Voltage Isolated Flyback Converter |
| Pages / Page | 26 / 1 — FEATURES. DESCRIPTION. 4.5V to 100V Input Voltage Range. Internal 240mA, … |
| File Format / Size | PDF / 265 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. 4.5V to 100V Input Voltage Range. Internal 240mA, 150V Power Switch. Boundary Mode Operation
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LT3511 Monolithic High Voltage Isolated Flyback Converter
FEATURES DESCRIPTION
n
4.5V to 100V Input Voltage Range
The LT®3511 is a high voltage monolithic switching regula- n
Internal 240mA, 150V Power Switch
tor specifically designed for the isolated flyback topology. n
Boundary Mode Operation
No third winding or opto-isolator is required for regula- n
No Transformer Third Winding or
tion as the part senses output voltage directly from the
Opto-Isolator Required for Regulation
primary-side flyback waveform. The device integrates a n
Improved Primary-Side Winding Feedback
240mA, 150V power switch, high voltage circuitry, and
Load Regulation
control into a high voltage 16-lead MSOP package with n VOUT Set with Two External Resistors four leads removed. n BIAS Pin for Internal Bias Supply and Power The LT3511 operates from an input voltage range of 4.5V Switch Driver to 100V and delivers up to 2.5W of isolated output power. n No External Start-Up Resistor Two external resistors and the transformer turns ratio n 16-Lead MSOP Package 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
APPLICATIONS
in a simple, clean, tightly regulated application solution to n Isolated Telecom Power Supplies the traditionally tough problem of isolated power delivery. n Isolated Auxiliary/Housekeeping Power Supplies n Isolated Industrial, Automotive and Medical Power 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 Supplies property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522.
TYPICAL APPLICATION 48V to 5V Isolated Flyback Converter Output Load and Line Regulation
5.25 VIN V + OUT 36V TO 72V 4:1 5.20 5V 1μF 1M V 0.3A IN t 5.15 EN/UVLO 300μH 19μH 22μF 5.10 43.2k t V – IN = 48V V LT3511 169k V IN = 36V OUT 5.05 RFB (V) RREF 5.00 OUT 10k V 4.95 VIN = 72V T 4.90 C SW VC GND BIAS 4.85 4.80 69.8k 16.9k 4.75 3.3nF 4.7μF 0 50 100 150 200 250 300 3511 TA01a LOAD CURRENT (mA) 3511 TA01b 3511fc 1
FEATURES DESCRIPTION
n
4.5V to 100V Input Voltage Range
The LT®3511 is a high voltage monolithic switching regula- n
Internal 240mA, 150V Power Switch
tor specifically designed for the isolated flyback topology. n
Boundary Mode Operation
No third winding or opto-isolator is required for regula- n
No Transformer Third Winding or
tion as the part senses output voltage directly from the
Opto-Isolator Required for Regulation
primary-side flyback waveform. The device integrates a n
Improved Primary-Side Winding Feedback
240mA, 150V power switch, high voltage circuitry, and
Load Regulation
control into a high voltage 16-lead MSOP package with n VOUT Set with Two External Resistors four leads removed. n BIAS Pin for Internal Bias Supply and Power The LT3511 operates from an input voltage range of 4.5V Switch Driver to 100V and delivers up to 2.5W of isolated output power. n No External Start-Up Resistor Two external resistors and the transformer turns ratio n 16-Lead MSOP Package 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
APPLICATIONS
in a simple, clean, tightly regulated application solution to n Isolated Telecom Power Supplies the traditionally tough problem of isolated power delivery. n Isolated Auxiliary/Housekeeping Power Supplies n Isolated Industrial, Automotive and Medical Power 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 Supplies property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522.
TYPICAL APPLICATION 48V to 5V Isolated Flyback Converter Output Load and Line Regulation
5.25 VIN V + OUT 36V TO 72V 4:1 5.20 5V 1μF 1M V 0.3A IN t 5.15 EN/UVLO 300μH 19μH 22μF 5.10 43.2k t V – IN = 48V V LT3511 169k V IN = 36V OUT 5.05 RFB (V) RREF 5.00 OUT 10k V 4.95 VIN = 72V T 4.90 C SW VC GND BIAS 4.85 4.80 69.8k 16.9k 4.75 3.3nF 4.7μF 0 50 100 150 200 250 300 3511 TA01a LOAD CURRENT (mA) 3511 TA01b 3511fc 1
