Datasheet U2008B (Atmel)

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 Applications Phase-control
•
Low-cost Motor Control
•
Domestic Appliance IC with Soft Start 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
Atmel U2008B
control with load-current feedback and overload protection are preferred applications.
Figure 1-1.
Block Diagram with Typical Circuit: Load Current Sensing 230V ~ 22kΩ/2W BYT51K R1 D R 1 R8 2 α 330kΩ max 1MΩ Load 7 6 Limiting Voltage Mains voltage detector detector compensation Automatic
Atmel
retriggering
U2008B
Phase 5 -VS Current control unit TIC detector 226 ϕ = f(V3) C1 22µF/ R3 8 Supply 25V voltage limiting 4 GND 180Ω Full wave load Reference - current + voltage 1 detector Voltage R Soft start monitoring 14 47kΩ 2 3 R10 100kΩ Set point P1 ^ R6 V(R6) = ±250mV C C4 Load current 3 compensation R 3.3nF 100nF 7 4712D–AUTO–03/11 Document Outline Features Applications 1. Description 2. Pin Configuration 2.1 Mains Supply, Pin 5 2.2 Voltage Monitoring 2.3 Phase Control, Pin 6 2.4 Automatic Retriggering 2.5 Current Synchronization, Pin 8 2.6 Voltage Synchronization with Mains Voltage Compensation, Pin 7 2.7 Load Current Detection, Pin 1 3. Absolute Maximum Ratings 4. Thermal Resistance 5. Electrical Characteristics 6. Ordering Information 7. Package Information 8. Revision History