Power Management
Switching Regulator
Flyback, Forward and Isolated Controllers
Space & Harsh Environment
Military Plastic (MP)
LT3512 - Monolithic High Voltage Isolated Flyback Converter
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
Typical Application
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.
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LT3512EMS#PBF | MSOP | 16 | E | $4.50 | $3.15 | View |
| LT3512EMS#TRPBF | MSOP | 16 | E | $3.21 | View | |
| LT3512HMS#PBF | MSOP | 16 | H | $5.54 | $3.88 | View |
| LT3512HMS#TRPBF | MSOP | 16 | H | $3.94 | View | |
| LT3512IMS#PBF | MSOP | 16 | I | $4.96 | $3.47 | View |
| LT3512IMS#TRPBF | MSOP | 16 | I | $3.53 | View | |
| LT3512MPMS#PBF | MSOP | 16 | MP | $13.36 | $9.35 | View |
| LT3512MPMS#TRPBF | MSOP | 16 | MP | $9.41 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1803A | LT3512EMS Demo Board | 36V VIN 75V, VOUT = 5V @ 500mA | $150.00 | |
| Buy Now | |||
Applications
- Isolated Telecom Power Supplies
- Isolated Auxiliary/Housekeeping Power Supplies
- Isolated Industrial, Automotive and Medical Power Supplies
Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LT3512
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
