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U2008B Datasheet

Low-Cost Phase-Control IC with Soft Start

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Low-Cost Phase-Control IC with Soft Start
U2008B
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.
Features
D Full wave current sensing
D Mains supply variation compensated
D Variable soft-start or load-current sensing
D Voltage and current synchronization
D Automatic retriggering switchable
D Triggering pulse typ. 125 mA
D Internal supply-voltage monitoring
D Current requirement v 3 mA
Applications
D Low-cost motor control
D Domestic appliance
Block Diagram
230 V ~
Load
Limiting
detector
22 kW/2W BYT51K
R2
330 kW
R1 D1
amax
R8
1 MW
76
Voltage
detector
Mains voltage
compensation
Automatic
retriggering
TIC
226
R3
180W
8
1
Current
detector
Full wave load
current detector
Soft start
R6
^
V(R6)
=
±250
mV
Phase
control unit
ö = f (V3)
U2008B
23
C3
3.3 nF
C4
100 nF
+–
Supply
voltage
limiting
Reference
voltage
Voltage
monitoring
R10 100 kW
Load current
compensation
5 –VS
C1
22 mF/
25 V
4 GND
R14
47 kW
Set point
R7
P1
Figure 1. Block diagram with typical circuit: Load current sensing
Rev. A4, 12-Jan-01
1 (10)
ATMEL Corporation
ATMEL Corporation



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