IES5521A Zero Crossing Triac Control with Time-Out Timer IC
IES5521A is a cost-efficient temperature control integrated circuit with an added “time-out” timer function as a safety feature to automatically switch off the triac operation after a selectable preset operating time whilst mains power remains connected. This is a key safety feature for many domestic electrical and personal appliances. The nominal “time-out” period is 1 hour controlled from the AC supply frequency (50Hz or 60Hz). Other “time-out” periods from less than 1 hour or up to more than 5 hours can be easily set by the use of an external RC network. The IES5521A like the OM1654A, offers the simplicity of direct mains operation for triac control of heating elements. The IES5521A is an ideal electronic replacement for bimetallic thermostats, where a “time-out” timer needs to be introduced as a safety feature in home appliances.
features
Time-out timer turns triac control off Option for 1 hour time-out or can be set to less than 1 hour or more than 5 hours using external RC components Timer easily reset by switching mains off and on again Zero crossing triac control		Low external components count Low supply current requirement Direct AC mains powered (110V/ 240V mains) Mains AC powered sensor Easy gate pulse width adjustment On chip protection against gate spikes Small size packaging (SO8)
benefits
Added auto turn off features Eliminate the need of extra circuitry for time-out Eliminate the need for an additional RESET switch No external DC supply required Minimal RFI filtering circuit		Small PCB footprint Low external component count translates to low electronic circuitry cost Lifetime accuracy Proven reliability
applications
Hair styling tools Hair straighteners Hair crimpers Hair curlers/ curling irons Hot hair rollers		Home heating appliances Electric frypan Deep fryer Electric iron Heating pads
block diagram
applications support
Demo board HM216: Standard IES5521A demo Demo board HM231: IES5521A/ OM1654A hair straightener application Specifically designed to demonstrate the features of IES5521A/ OM1654A in hair straightener/ curling irons application. News about IES5521A for hair styling tools is on Electronicstalk