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TEMIC Semiconductors
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U2010B Datasheet Preview

U2010B Datasheet

Phase Control Circuit for Current Feedback

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Phase Control Circuit for Current Feedback
U2010B
Description
The U2010B is designed as a phase-control circuit in
bipolar technology. It enables load-current detection and
has a soft-start function as well as reference voltage
output. Motor control with load-current feedback and
overload protection are preferred applications.
Features
D Full wave current sensing
D Mains supply variation compensated
D Programmable load-current limitation
with over- and high-load output
D Variable soft-start
D Voltage and current synchronization
D Automatic retriggering switchable
D Triggering pulse typical 125 mA
Package: DIP16, SO16
D Internal supply voltage monitoring
vD Current requirement 3 mA
D Temperature compensated reference voltage
Applications
D Advanced motor control
D Grinder
D Drilling machine
Block Diagram
96 11646
15
Limiting
detector
Voltage
detector
14 13
Overload
Mains voltage
compensation
12
High load
11
Supply 10
voltage GND
Automatic
retriggering
Current
detector
16
Pulse
output
1
Load
current
detector
Phase
control unit
ö = f (V4)
Output
12
Full wave
rectifier
Level
shift
100% 70% amaxA
B9
Programmable Auto–
+ overload start
protection
C
Imax
Voltage
monitoring
Soft Reference
start voltage
2 3 45
67
8
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
1 (12)




TEMIC Semiconductors
TEMIC Semiconductors

U2010B Datasheet Preview

U2010B Datasheet

Phase Control Circuit for Current Feedback

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U2010B pdf
U2010B
Figure 2. Block diagram with external circuit
General Description
Mains Supply
The U2010B contains voltage limiting and can be
connected with the mains supply via D1 and R1. Supply
* *voltage between Pin 10 and Pin 11 is smoothed
by C1.
vIn the case of V6 (70% of overload threshold voltage),
v wPins 11 and 12 are connected internally whereby
Vsat 1.2 V. When V6 VT70, the supply current
flows across D3.
2 (12)
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96




TEMIC Semiconductors
TEMIC Semiconductors

U2010B Datasheet Preview

U2010B Datasheet

Phase Control Circuit for Current Feedback

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U2010B pdf
U2010B
Pin Description
Isense
1
Isense
Cö
2
3
Control 4
Comp. 5
ILoad
Csoft
6
7
VRef
8
16 Output
15 VSync.
14 VRö
13 Overload
12 High load
11 VS
10 GND
9 Mode
95 11406
Pin Symbol
Function
1 Isense Load current sensing
2 Isense Load current sensing
3 Cö Ramp voltage
4 Control Control input
5 Comp. Compensation output
6 ILoad Load current limitation
7 Csoft Soft start
8 VRef Reference voltage
9 Mode Mode selection
10 GND Ground
11 VS Supply voltage
12 High load High load indication
13 Overload Overload indication
14 VRö Ramp current adjust
15 VSync. Voltage synchronization
16 Output Trigger output
Series resistance R1 can be calculated as follows:
Vmains
VSmax
Itot
ISmax
Ix
+R1max
Vmains – VSmax
2 Itot
whereas
+ Mains supply voltage
+ Maximum supply voltage
+ )Total current consumption = ISmax Ix
+ Maximum current consumption of the IC
+ Current consumption of the
external components
Voltage Monitoring
As the voltage is built up, uncontrolled output pulses are
avoided by internal voltage monitoring. Apart from that
all the latches in the circuit (phase control, load limit
regulation) are reset and the soft-start capacitor is short
circuited. This guarantees a specified start-up behavior
each time the supply voltage is switched on or after short
interruptions of the mains supply. Soft-start is initiated
after the supply voltage has been built up. This behavior
guarantees a gentle start-up for the motor and auto-
matically ensures the optimum run-up time.
Phase Control
The function of the phase control is largely identical to the
well known IC family U211B. The phase angle of the
trigger pulse is derived by comparing the ramp voltage V3
which is mains synchronized by the voltage detector with
the set value on the control input, Pin 4. The slope of the
ramp is determined by Cö and its charging current Iö. The
charging current can be varied using Rö at Pin 14. The
maximum phase angle, αmax, can also be adjusted by
using Rö (minimum current flow angle ömin) see figure 4.
When the potential on Pin 3 reaches the set point level of
Pin 4, a trigger pulse width, tp, is determined from the
value of Cö (tp = 9 ms/nF). At the same time, a latch is set
with the output pulse, as long as the automatic
retriggering has not been activated, then no more pulses
can be generated in that half cycle. Control input at Pin 4
(with respect to Pin 10) has an active range from
V8 to –1 V. When V4 = V8, then the phase angle is at its
wmaximum, αmax, i.e., the current flow angle is minimum.
The minimum phase angle, αmin, is set with V4 –1 V.
Automatic Retriggering
The current-detector circuit monitors the state of the triac
after triggering by measuring the voltage drop at the triac
gate. A current flow through the triac is recognized, when
the voltage drop exceeds a thres hold level of typ. 40 mV.
If the triac is quenched within the relevant half-wave after
triggering; for example owing to low load currents before
or after the zero crossing of current wave or; for commu-
tator motors, owing to brush lifters. Then the automatic
retriggering circuit ensures immediate retriggering, if
necessary with a high repetition rate, tpp/tp, until the triac
remains reliably triggered.
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
3 (12)




Part Number U2010B
Description Phase Control Circuit for Current Feedback
Maker TEMIC Semiconductors
Total Page 12 Pages
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