LT8310 - 100VIN Forward Converter Controller
Features
- Input Voltage Range: 6V to 100V
- Duty Mode Control Regulates an Isolated Output without an Opto
- High Efficiency Synchronous Control
- Short-Circuit (Hiccup Mode) Overcurrent Protection
- Programmable OVLO and UVLO with Hysteresis
- Programmable Frequency (100kHz to 500kHz)
- Synchronizable to an External Clock
- Positive or Negative Polarity Output Voltage Feedback with a Single FBX Pin
- Programmable Soft-Start
- Low Shutdown Current < 1μA
- Available in FE20 TSSOP with HV Pin Spacing
Typical Application
Description
The LT®8310 is a simple-to-use resonant reset forward converter controller that drives the gate of a low side N-channel MOSFET from an internally regulated 10V supply. The LT8310 features duty mode control that generates a stable, regulated, isolated output using a single power transformer. With the addition of output voltage feedback, via opto-coupler (isolated) or directly wired (nonisolated), current mode regulation is activated, improving output accuracy and load response. The flexibility to choose transformer turns ratio makes high step-down or step-up ratios possible without operating at duty cycle extremes.
The user can program the switching frequency from 100kHz to 500kHz to optimize efficiency, performance or external component size. A synchronous output is available for controlling secondary side synchronous rectification to improve efficiency. User programmable protection features include monitors on input voltage (UVLO and OVLO) and switch current (overcurrent limit). The LT8310 soft-start feature helps protect the transformer from flux saturation.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT8310EFE#PBF | TSSOP-20 | FE | E | 05-08-1924 | Yes |
| LT8310EFE#TRPBF | TSSOP-20 | FE | E | 05-08-1924 | Yes |
| LT8310HFE#PBF | TSSOP-20 | FE | H | 05-08-1924 | Yes |
| LT8310HFE#TRPBF | TSSOP-20 | FE | H | 05-08-1924 | Yes |
| LT8310IFE#PBF | TSSOP-20 | FE | I | 05-08-1924 | Yes |
| LT8310IFE#TRPBF | TSSOP-20 | FE | I | 05-08-1924 | Yes |
| LT8310MPFE#PBF | TSSOP-20 | FE | MP | 05-08-1924 | Yes |
| LT8310MPFE#TRPBF | TSSOP-20 | FE | MP | 05-08-1924 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- 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 | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT8310EFE#PBF | TSSOP-20 | E | $3.94 | $2.99 | Yes | |
| LT8310EFE#TRPBF | TSSOP-20 | E | $3.05 | Yes | ||
| LT8310HFE#PBF | TSSOP-20 | H | $4.79 | $3.60 | Yes | |
| LT8310HFE#TRPBF | TSSOP-20 | H | $3.66 | Yes | ||
| LT8310IFE#PBF | TSSOP-20 | I | $4.37 | $3.31 | Yes | |
| LT8310IFE#TRPBF | TSSOP-20 | I | $3.37 | Yes | ||
| LT8310MPFE#PBF | TSSOP-20 | MP | $13.11 | $9.60 | Yes | |
| LT8310MPFE#TRPBF | TSSOP-20 | MP | $9.66 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about 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 |
|---|---|---|---|
| DC1963A | LT8310EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 12V @ 6A | $250.00 | |
| DC2015A | LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 12A | $300.00 | |
| Buy Now | |||
Applications
- Industrial, Automotive and Military Systems
- 48V Telecommunication Isolated Power Supplies
- Isolated and Nonisolated DC/DC Converters
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Product Notifications
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
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
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- LT8310/LT1431 Demo Circuit - 72 Watt Isolated Nonsynchronous Forward Converter with Opto Feedback (36-72V to 12V @ 6A)
- LT8310/LT1431 Demo Circuit - 81 Watt Isolated Nonsynchronous Forward Converter with Opto Feedback (10.8-26.4V to 54V @ 1.5A)
- LT8310/LT1431 Demo Circuit - 92W Isolated Nonsynchronous Forward Converter with Opto Feedback (43-53V to 54V @ 1.7A)
- Step 3: If LTspice 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.
Models for the following parts are available in LTspice:
LT8310
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.
