LTC3805
Linear Technology
LTC3805 constant frequency current mode flyback controller
Reference DesignAnalog
DC1045 - LTC3805 Telecom Isolated DC/DC Converter User Guide
Demonstration circuit 1045 is an isolated DC/DC converter featuring the LTC3805 flyback controller, converting 36V-72V input to a 3.3V, 3A output for telecom and PoE applications.
Overview
The DC1045 demonstration circuit is a telecom-grade isolated DC/DC converter utilizing the LTC3805 constant frequency current mode flyback controller. It is designed to convert a 36V to 72V input voltage into a regulated 3.3V output with up to 3A of current. Operating at a 200kHz constant frequency, the circuit maintains high efficiency and low noise across a wide load range, featuring ±2% output accuracy with no minimum load requirement. The design includes the LTC4430 for secondary-side opto-coupler driving and can be modified for non-isolated operation or alternative output voltages up to 15V.
Use Cases
- Telecom power systems
- Automotive electronics
- Power-over-Ethernet (PoE) applications
- Isolated industrial power conversion
Topics
LTC3805
LTC4430
flyback controller
isolated DC/DC converter
telecom power supply
Power-over-Ethernet
PoE
3.3V output
36V-72V input
current mode control
Referenced Parts
LTC4430
Linear Technology
removing opto coupler and LTC4430 circuit
| LTC3805 | Linear Technology | LTC3805 constant frequency current mode flyback controller |
| LTC4430 | Linear Technology | removing opto coupler and LTC4430 circuit |