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Overview
| Topology | Flyback Converter |
| Input voltage | 4.5-100 V |
| Switching frequency | 40-650 kHz |
| IC revision | B |
Description
The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation 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.
Features
- 4.5V to 100V Input Voltage Range
- Internal 420mA, 150V Power Switch
- Boundary Mode Operation
- No Transformer Third Winding or
- Opto-Isolator Required for Regulation
- Improved Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- BIAS Pin for Internal Bias Supply and Power Switch Driver
- No External Start-Up Resistor
- 16-Lead MSOP Package
Remarks:
- Refer page num 10 for more transformers.
Typical applications
- Automotive Power Supplies
- Isolated Telecom Power Supplies
- Isolated Auxiliary/Housekeeping Power Supplies
- Isolated Industrial Power Supplies
- Medical Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN(V) | VOut1(V) | IOut1(A) | VOut2(V) | IOut2(A) | Vaux(V) | L(µH) | n | ISAT(A) | LS(µH) | VT(V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 8 - 15 V (DC), 150 V | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 8 - 15 V (DC) | Output Voltage 1150 V | Output Current 10.001 A | Output Voltage 2-150 V | Output Current 20.001 A | – | Inductance80 µH | Turns Ratio1:5:5 | Saturation Current1 A | Leakage Inductance2 µH | Insulation Test Voltage1500 V (AC) | SizeEP7 | IC ReferenceLT3748 | |||||
 | WE-FLYLT Flyback Transformers for Linear Technology, 35 - 75 V (DC), 5 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FLYLT Flyback Transformers for Linear Technology | Input Voltage 35 - 75 V (DC) | Output Voltage 15 V | Output Current 10.4 A | – | – | Auxiliary Voltage5 V | Inductance175 µH | Turns Ratio4:1:1 | Saturation Current0.8 A | Leakage Inductance3 µH | Insulation Test Voltage1500 V (AC) | SizeEP7 | IC ReferenceLT8300 | ||||
 | 750311573 | Flyback Transformer WE-FB, 35 - 75, 5 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer WE-FB | Input Voltage 35 - 75 | Output Voltage 15 V | Output Current 10.5 A | – | – | Auxiliary Voltage6.6 V | Inductance200 µH | – | Saturation Current0.8 A | – | Insulation Test Voltage1500 V (AC) | SizeEP7 | – | |||
| 750311661 | Flyback Transformer, 36 - 72 V (DC), 15 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer | Input Voltage 36 - 72 V (DC) | Output Voltage 115 V | Output Current 10.24 A | – | – | Auxiliary Voltage5 V | Inductance150 µH | – | Saturation Current1.1 A | – | Insulation Test Voltage1500 V (AC) | SizeEP7 | – | |||
| 750311662 | Flyback Transformer WE-FB, 36 - 72 V (DC), 48 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer WE-FB | Input Voltage 36 - 72 V (DC) | Output Voltage 148 V | Output Current 10.13 A | – | – | Auxiliary Voltage5 V | Inductance0.33 µH | – | Saturation Current0.8 A | – | Insulation Test Voltage1500 V (AC) | SizeEP7 | – | |||
750311839 | Flyback Transformer WE-FB, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer WE-FB | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
750311964 | Flyback Transformer WE-FB, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer WE-FB | – | – | – | – | – | – | – | – | – | – | – | – | – |