EVL6562A-LED: 350mA @ 45V Max, 36 ~ 60V in

Summary

Whenever a lighting application, such as street lighting for example, requires an elevated number of LEDs, there are basically two solutions: the first is to connect all the diodes in series in a single "string"; the second is to place several strings in parallel with fewer elements in each one.

The first solution, even if simpler, poses stringent safety requirements due to the high supply voltage. The latter needs a lower input voltage but the current through each string has to be independently controlled.

Since, from a system point of view, the second solution seems more viable, we have developed an application to investigate the possibility of employing an L6562A to implement such a constant current controller. This document describes the EVL6562A-LED demonstration board and summarizes the relevant results obtained.

Specifications

Manufacturer	STMicroelectronics
Category	Lighting
Sub-Category	LED Drivers - DC In
Eval Board Part Number	497-10420-ND
Eval Board Supplier	STMicroelectronics
Eval Board	Normally In Stock
Voltage In	36 ~ 60 V
Topology	Step Down
Current Out	350 mA
Voltage Out (Max)	45 V
Outputs and Type	1 Non-Isolated
Efficiency @ Conditions	>92%, 48V in, 40 ~ 45V @ 350 mA >82%, 48V in, 16Vled @ 350 mA
Features	Current Limit (Adj. or Fixed) Dimming Control Open Circuit Protection Short Circuit Protection Shutdown, Enable, Standby
Switching Frequency	15 ~ 460 kHz
Component Count + Extras	46 + 1
Design Author	STMicroelectronics
Application / Target Market	Lighting: LED Street Lighting
Main I.C. Base Part	L6562A
Date Created By Author
Date Added To Library	2011-03