LT1105
PRODUCTIONOffline Switching Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $6.43
Overview
- ±1% Line and Load Regulation with No Optocoupler
- Switch Frequency Up to 200kHz
- Internal 1A Totem-Pole Driver (LT1105)
- Start-Up Mode Draws Only 200µA
- Fully Protected Against Overloads
- Overvoltage Lockout of Main Supply
- Protected Against Underdrive or Overdrive to FET
- Operates in Continuous or Discontinuous Mode
- Ideal for Flyback and Forward Topologies
- Isolated Flyback Mode Has Fully Floating Outputs
The LT1105 Offline Switching Regulator is designed for high input voltage applications using an external FET switch. The LT1105 is available and its totem pole output drives the gate of an external FET. Unique design of the LT1105 eliminates the need for an optocoupler while still providing ±1% load and line regulation in a magnetic flux-sensed converter. This significantly simplifies the design of offline power supplies and reduces the number of components which must cross the isolation barrier to one, the transformer.
The LT1105 current mode switching techniques are well suited to transformer isolated flyback and forward topologies while providing ease of frequency compensation with a minimum of external components.
APPLICATIONS
- Up to 250W Isolated Mains Converter
- Up to 50W Isolated Telecom Converter
- Fully Isolated Multiple Outputs
- Distributed Power Conversion Networks
Documentation
Data Sheet 1
Design Note 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT1105CN#PBF | 14-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1105CN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1105IN#PBF | 14-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1105IN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT1105CN#PBF | PRODUCTION | |
| LT1105CN8#PBF | PRODUCTION | |
| LT1105IN#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LT1105CN#PBF | PRODUCTION | |
| LT1105CN8#PBF | PRODUCTION | |
| LT1105IN#PBF | PRODUCTION | |
|
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package |
||
| LT1105CN8#PBF | PRODUCTION | |
| LT1105IN8#PBF | PRODUCTION | |
|
Dec 18, 2023 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT1105IN8#PBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT1725 | PRODUCTION | General Purpose Isolated Flyback Controller |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT1105
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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