Page 19

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

SX8124

24 hours timer synchronized on 50/60Hz mains

ACS - Revision 2.4

October 2010

© Semtech Corp.

11.2

Low cost LED output

The schematic on Figure 21 below shows a LED driving without the usage of a coil to drive the LED, and also

reduce the costs of the BOM. The Rlim, Rb resistors and the transistor hfe must be carefully choosed

according to the LED and mains voltage.

Figure 21. LED supplied by the mains

SX8124

0.9 – 2.0 V

LED

VSS

VDD

LED

100V or 200V

Mains

Rlim

Rb