Features and Benefits
- Regulates Two Secondary Outputs
- Optocoupler Feedback Driver and Second Output Synchronous Driver Controller
- True Differential Remote Sensing Regulation
- High Switching Frequency: up to 800kHz
- Programmable Current Limit
- Programmable Soft-Start and Power Good
- Automatic Frequency Synchronization
- Available in Thermally Enhanced 28-Lead TSSOP
The LT3804 is a high efficiency step-down switching regulator with optocoupler feedback control for regulating multiple outputs in single-secondary winding isolated power supplies.
The LT3804 contains an error amplifier and an optocoupler driver to regulate the first (main) output. For the second output regulation, the LT3804 contains a complete PWM controller to drive dual synchronous N-channel MOSFETs. With leading edge modulation, it operates with either current or voltage mode control of the primary side. The LT3804 is synchronized to the falling edge of the transformer secondary winding and can be used in single ended or double-ended isolated power converter topologies. A user selectable discontinuous conduction mode improves light load efficiency.
True differential Kelvin sensing is used for each output feedback amplifier to achieve high regulation accuracy and design simplicity. Other features include soft start, current limit and power good flags.
- 48V Input Isolated DC/DC Converters
- Multiple Output Power Supplies
- Offline Converters
- DC/DC Power Modules
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
DC610A Demo Board for:
LTC1693 High Speed Single/Dual N-Channel MOSFET Drivers
LT3804 Secondary Side Dual Output Controller with Opto Driver
LT3781 Bootstrap Start Dual Transistor Synchronous Forward Controller
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.