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 # Symbol Parameter 1 IDDL Current Consumption 2 IDDH Current Consumption 3 IDDL_Error Current Consumption Error-Mode 4 VTRES Threshold Voltage Input TRES Conditions VOUT = Low VDD =12V VINZ = 1V VOUT = High VDD =12V VINZ = 1V VOUT = Low VDD =12V,VINz=1V VOT 1V VDD =12V Min Typ Max Unit - 0.8 1.0 mA - 0.5 0.8 mA - 1.4 1.9 mA 6.5 7.5 8.5 V 5 VPON Threshold Voltage Power on VDD =12V 8.0 9.1 9.9 V 6 7 VTH OC1, 2 Threshold Voltage OC1, 2 VDD =12V 0.55 0.75 0.85 V VTH OV/OT Threshold Voltage OV/OT VDD =12V 0.55 0.75 0.85 V 8 VOUTH Output Voltage High OUT -IOUT = 6mA 7.5 9.2 - V 7.5 10.6 - V - 0.2 0.55 V - 0.1 0.55 V - 0.2 0.55 V VDD =12V 9 VOUTH Output Voltage High OUT -IOUT = 10µA VDD =12V 10 VOUTL Output Voltage Low OUT IOUT = 6mA VDD =12V 11 VOUTL Output Voltage Low OUT IOUT = 10µA VDD =12V 12 VOSL Output Voltage Low Error-Mode OS IOS= 2mA VDD =12V 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 Symbol Parameter tr OUT 1) Turn-on rise time Conditions CL = 1.5nF Min Typ Max Unit - 200 500 ns - 200 500 ns VDD =12V 2 Tf OUT Turn-off fall time 1) CL = 1.5nF VDD =12V 3 tSoft c Soft Start Time cold 1) CCS = 4.7µF, max. Full Power PF= 0.95 VDD =12V 1) Parameters are protected by correlation measure 1.9 s