DC1947A: 1A @ 50V Max, 90 ~ 277VAC in

Summary

Demonstration circuit 1947A is an off-line isolated flyback LED driver featuring LTC®3799-1. The demo board provides a single constant current output of 1A over an LED string voltage from 30V to 50V. It is optimized to operate over a wide AC input voltage range (90VAC to 277VAC, 47Hz to 63Hz). It provides a high power factor (>0.9) enabling a single design to be used worldwide. It is also designed to comply with the IEC 61000-3-2 Class C harmonics standard and the EN55015B conducted EMI standard.

The LT3799-1 controls an isolated flyback converter in boundary mode. Its novel current sensing scheme delivers a well-regulated output current to the secondary side without using an opto-coupler. Open- and shorted-LED protection ensures long term reliability.

The LT3799-1 is available in a low profile, thermally enhanced 16-lead MSOP package.

The LT3799-1 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1947A.

Specifications

Manufacturer	Analog Devices Inc.
Category	Lighting
Sub-Category	LED Drivers - AC / Offline
Eval Board Part Number	DC1947A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
AC Voltage	115 V 230 V Universal
Outputs and Type	1 Isolated
Current Out	1 A
Voltage Out (Max)	50 V
Efficiency @ Conditions	>87%, 90 ~ 277 VAC, 48V @ 1 A
Features	Current Limit (Adj. or Fixed) Fault Indication Open Circuit Protection PFC Short Circuit Protection Voltage Reference
Switching Frequency	25 ~ 300 kHz
Component Count + Extras	45 + 6
Design Author	Linear Technology
Application / Target Market	Lighting: LED Commercial Lighting Lighting: LED Home Lighting
Voltage In	90 ~ 277 VAC
Power Factor	>0.9
Standard(s)	EN55015 B conducted EMI IEC 61000-3-2 Class C
Main I.C. Base Part	LT3799-1
Date Created By Author	2012-11
Date Added To Library	2015-10