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U2008B_07 Datasheet, PDF (1/13 Pages) ATMEL Corporation – Low-cost Phase-control IC with Soft Start
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 125 mA
• Internal Supply-voltage Monitoring
• Current Requirement ≤ 3 mA
Applications
• Low-cost Motor Control
• Domestic Appliance
1. Description
The 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
230 V ~
Load
22 kΩ/2W
BYT51K
R2
330 kΩ
R1 D1
αmax
R8
1 MΩ
7
6
Limiting
detector
Voltage
detector
Mains voltage
compensation
Low-cost
Phase-control
IC with Soft
Start
U2008B
Automatic
retriggering
TIC
226
Current
detector
R3
8
180Ω
Full wave load
1
current
detector
Soft start
Phase
control unit
ϕ = f(V3)
2
3
^
R6
V(R6) = ±250 mV
C3
3.3 nF
C4
100 nF
U2008B
+-
5
-VS
Supply
voltage
limiting
C1
22 µF/
25 V
4 GND
Reference
voltage
Voltage
monitoring
R14
47 kΩ
R10 100 kΩ
Set point
P1
Load current
compensation
R7
4712C–AUTO–07/07