U2008B
Low Cost Current Feedback Phase Control Circuit
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 3 mA
v
Applications
D
Low cost motor control
D
Domestic appliance
Package:
DIP8, SO8
Block Diagram
22 k
W
/2W
230 V ~
330 k
W
Load
7
Limiting
detector
Voltage
detector
6
Mains voltage
compensation
R
2
R
1
BYT51K
D
1
a
max
1 M
W
96 11643
R
8
Automatic
retriggering
Phase
control unit
5
TIC
226
R
3
180
W
8
Current
detector
–V
S
22
m
F/
25 V
C
1
ö
= f (V
3
)
Supply
voltage
limiting
4
GND
1
Full wave load
current detector
Soft start
2
3
+
–
Reference
voltage
Voltage
monitoring
R
14
47 k
W
R
10
R
6
^
V
(R6)
=
±250
mV
C
3
3.3 nF
C
4
100 nF
100 k
W
Set point
R
7
P
1
50 k
W
Load current
compensation
12 k
W
Figure 1. Block diagram with typical circuit: Load current sensing
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
1 (10)
TEMIC [ TEMIC SEMICONDUCTORS ]
