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U2008B-MY
Features • • • • • • • • Full Wave Current Sensing Compensated Mains Supply Variations Variable Soft Start or Load-current Sensing Voltage and Current Synchronization Switchable Automatic Retriggering Triggering Pulse Typically 125mA Internal Supply-voltage Monitoring Current Requirement ≤ 3mA Low-cost Phase-control IC with Soft Start Applications • Low-cost Motor Control • Domestic Appliance 1. Description The Atmel® U2008B is designed as a phase-control circuit in bipolar technology. It enables load-current detection as well as mains-compensated phase control. Motor control with load-current feedback and overload protection are preferred applications. Figure 1-1. Block Diagram with Typical Circuit: Load Current Sensing 22kΩ/2W 230V ~ R1 R2 330kΩ Load BYT51K D1 αmax 7 Limiting detector R8 1MΩ 6 Voltage detector Mains voltage compensation Atmel U2008B Automatic retriggering Phase control unit Current detector TIC 226 R3 ϕ = f(V3) C1 Supply voltage limiting 8 1 Full wave load current detector + - 22µF/ 25V 4 GND Reference voltage Voltage monitoring Soft start 2 C3 3.3nF R14 47kΩ 3 R10 ^ V(R6) = ±250mV -VS 5 180Ω R6 Atmel U2008B C4 100nF 100kΩ Set point Load current compensation R7 P1 4712D–AUTO–03/11
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