Analog Devices DC1817B | Demoboard DC1817B

Description

Demonstration circuit 1817B is an off-line isolated flyback converter featuring the LT®3798. The demo board provides a single constant-voltage output of 24V at 2A. It is optimized to operate over a wide AC input voltage range (90VAC to 265VAC, 47Hz to 63Hz). Output voltage accuracy stays within ±5% over the whole input voltage and load range. It provides a high power factor (>0.95) enabling the design to be used worldwide. It is also designed to comply with the IEC 61000-3-2 Class D harmonics standard and the EN55015B conducted EMI standard.The LT3798 controls an isolated flyback converter in boundary mode, suitable for applications with voltage or current regulation. Its novel sensing scheme delivers a well regulated output voltage or current to the secondary side without the use of an opto-coupler. The LT3798 is available in a low profile, thermally enhanced 16-lead MSOP package. The LT3798 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1817B.

Features

• Isolated PFC Flyback with Minimum Number of External Components
• VIN and VOUT Limited Only by External Components
• Active Power Factor Correction
• Low Harmonic Distortion
• No Opto-Coupler Required
• Constant-Current and Constant-Voltage Regulation
• Accurate Regulated Voltage and Current (±5% Typical)
• Energy Star Compliant (<0.5W No Load Operation)
• Thermally Enhanced 16-lead MSOP Package

Typical applications

• Offline 5W to 100W+ Applications, High DC VIN Isolated Applications, Offline Bus Converter (12V, 24V or 48V Outputs）

More information

• Datasheet
• IC product information