DC1817B: 24V @ 2A, 90 ~ 265VAC in

Summary

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.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	AC/DC SMPS - Single Output
Eval Board Part Number	505-DC1817B-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
AC Voltage	115 V 230 V Universal (115 / 230V)
Outputs and Type	1 Isolated
Voltage Out	24 V
Current Out	2 A
Output Power	48 W
Features	Current Limit (Adj. or Fixed) Energy Standard Compliant Over Voltage Protection PFC Shutdown, Enable, Standby Thermal Protection Under Voltage Protection, Brown-Out
Efficiency @ Conditions	>87%, 90 ~ 270 VAC, 24 V 2 A >85%, 90 ~ 260 VAC, 24V @ 1 A
No-load Input Power @ Voltage	- Not Given
Switching Frequency	4 ~ 150 kHz
Internal Switch	No
Component Count + Extras	47 + 6
Voltage In	90 ~ 265 VAC
Design Author	Linear Technology
Application / Target Market	Power: Auxiliary Power Supply
Main I.C. Base Part	LT3798
Date Created By Author	2012-10
Date Added To Library	2015-05