A1780

a1780 general features The a1780 is a dimmer IC for halogen lamps. It uses an integrated time controller to control a wide range of DMOS switches, and includes protection circuits against overcurrent, over-voltage and over-temperature. A LED gives a visual indication of the output status at all times.  Dimming range: between 10% and 95%  Flexible soft start function (hot and cold – soft start)  Zero-crossing detection  Protection function for over-current, over-voltage and over-temperature  LED status indication for protection function  Ambient temperature range 0°C to 70°C  Package: Die-in-waffle-pack or SOP14 example application schematic A typical application schematic for a 350W load. electrical characteristics DC characteristics contain the spread of values guarantee within the specified supply voltage and temperature range and the technology process parameter range unless otherwise specified. Ta = 25°C for typical values # 1 2 3 Symbol IDDL IDDH IDDL_Error Parameter Current Consumption Current Consumption Current Consumption Error-Mode Conditions VOUT = Low VDD =12V VINZ = 1V VOUT = High VDD =12V VINZ = 1V VOUT = Low VDD =12V,VINz=1V VOT 1V VDD =12V VDD =12V VDD =12V VDD =12V -IOUT = 6mA VDD =12V 9 10 11 12 VOUTH VOUTL VOUTL VOSL Output Voltage High OUT Output Voltage Low OUT Output Voltage Low OUT -IOUT = 10µA VDD =12V IOUT = 6mA VDD =12V IOUT = 10µA VDD =12V Output Voltage Low Error-Mode OS IOS= 2mA VDD =12V 0.2 0.55 V 0.1 0.55 V 0.2 0.55 V 7.5 10.6 V Min Typ 0.8 0.5 1.4 Max 1.0 0.8 1.9 Unit mA mA mA 4 5 6 7 8 VTRES VPON VTH OC1, 2 VTH OV/OT VOUTH Threshold Voltage Input TRES Threshold Voltage Power on Threshold Voltage OC1, 2 Threshold Voltage OV/OT Output Voltage High OUT 6.5 8.0 0.55 0.55 7.5 7.5 9.1 0.75 0.75 9.2 8.5 9.9 0.85 0.85 - V V V V V AC characteristics contain the spread of values guarantee within the specified supply voltage and temperature range and the technology process parameter range unless otherwise specified. Ta = 25°C for typical values # 1 2 3 Symbol tr OUT Tf OUT tSoft c Parameter Turn-on rise time Turn-off fall time 1) Conditions CL = 1.5nF VDD =12V Min - Typ 200 200 1.9 Max 500 500 Unit ns ns s 1) CL = 1.5nF VDD =12V CCS = 4.7µF, max. Full Power PF= 0.95 VDD =12V Soft Start Time cold 1) 1) Parameters are protected by correlation measure