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Overview
| Topology | Other Topology |
| Switching frequency | 50-250 kHz |
Description
The LT®3825 is an isolated switching regulator controller designed for medium power flyback topologies. A typical application is 10W to 60W with input voltage limited only by external power path components. A third transformer winding provides output voltage feedback.The LT3825 is a current mode controller that regulates output voltage based on sensing secondary voltage via a transformer winding during flyback. This allows for tight output regulation without the use of an opto-isolator, improving dynamic response and reliability. Synchronous rectification increases converter efficiency and improves output cross regulation in multiple output converters.The LT3825 operates in forced continuous conductionmode which improves cross regulation in multiple windingapplications. Switching frequency is user programmableand can be externally synchronized. The part also has loadcompensation, undervoltage lockout and soft-start circuity.
Features
- Senses Output Voltage Directly from Primary SideWinding—No Opto-Isolator Required
- Synchronous Driver for High Efficiency
- Input Voltage Limited Only by ExternalPower Components
- Accurate Output Regulation without User Trims
- Switching Frequency from 50kHz to 250kHz
- Synchronizable
- Load Compensation
- Programmable Undervoltage Lockout
- Available in a Thermally Enhanced 16-LeadTSSOP Package
Typical applications
- Isolated Telecom, Medical Converters
- Isolated Medium Power (10W to 60W) Supplies
- Isolated Power over Ethernet Supplies
- Instrumentation Power Supplies