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Overview
| Topology | Flyback Converter |
| Input voltage | 36-72 V |
| Switching frequency | 40-650 kHz |
| Output 1 | 3.3 V / 0.7 A |
| Output 2 | 24 V / 0.11 A |
| Output 3 | -15 V / 0.1 A |
| Output 4 | 12 V / 0.2 A |
| Output 5 | 15 V / 0.2 A |
| Output 6 | 15 V / 0.1 A |
| Output 7 | 5 V / 0.5 A |
| 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 (mA) | Vaux (V) | L (µH) | n | ISAT (A) | LS (µH) | VT (V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750311559 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FLYLT Flyback Transformers for Linear Technology | 35 - 75 V (DC) | 5 | 400 | 5 | 175 | 4:1:1 | 0.8 | 3 | 1500 | EP7 | LT8300 | ||
 | 750311573 | SPEC | 3 files | Active i| Production is active. Expected lifetime: >10 years. | Flyback Transformer WE-FB | 35 - 75 | 5 | 500 | 6.6 | 200 | – | 0.8 | – | 1500 | EP7 | – | ||
| 750311662 | SPEC | 3 files | Active i| Production is active. Expected lifetime: >10 years. | Flyback Transformer WE-FB | 36 - 72 V (DC) | 48 | 130 | 5 | 0.33 | – | 0.8 | – | 1500 | EP7 | – | ||
| 750311839 | SPEC | – | – | Active i| Production is active. Expected lifetime: >10 years. | Flyback Transformer WE-FB | – | – | – | – | – | – | – | – | – | – | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN (V) | VOut1 (V) | IOut1 (mA) | Vaux (V) | L (µH) | n | ISAT (A) | LS (µH) | VT (V (AC)) | Size | IC Reference | Samples |
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