U211B.pdf 데이터시트 (총 20 페이지) - 파일 다운로드 U211B 데이타시트 다운로드

No Preview Available !

U211B2/ B3
Phase Control Circuit - General Purpose Feedback
Description
The integrated circuit U211B2/ B3 is designed as a phase
control circuit in bipolar technology with an internal fre-
quency-voltage converter. Furthermore, it has an internal
control amplifier which means it can be used for speed-
regulated motor applications.
Features
D Internal frequency-to-voltage converter
D Externally-controlled integrated amplifier
D Overload limitation with a “fold back” characteristic
D Optimized soft-start function
D Tacho monitoring for shorted and open loop
D Automatic retriggering switchable
It has an integrated load limitation, tacho monitoring and
soft-start functions, etc. to realize sophisticated motor
control systems.
D Triggering pulse typ. 155 mA
D Voltage and current synchronization
D Internal supply-voltage monitoring
D Temperature reference source
D Current requirement 3 mA
Package: DIP18 - U211B2,
SO16 - U211B3
17(16)
1(1)
Voltage / Current
detector
5*)
Automatic
retriggering
Output
pulse
4(4)
11(10)
Control
+ amplifier
10(9)
14(13)
15(14)
Load limitation
speed / time
controlled
Phase
control unit
ö= f (V12)
Supply
voltage
limitation
Reference
voltage
Voltage
monitoring
6(5)
7(6)
3(3)
–VS
2(2)
GND
16(15)
controlled
current sink
Soft start
–VRef
12(11)
13(12)
Frequency-
to-voltage
converter
Pulse-blocking
tacho
monitoring
9(8) 8(7)
18*)
95 10360
Figure 1. Block diagram (Pins in brackets refer to SO16)
*) Pins 5 and 18 connected internally
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
1 (20)

No Preview Available !

U211B2/ B3
2 (20)
Figure 2. Speed control, automatic retriggering, load limiting, soft start
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96

No Preview Available !

U211B2/ B3
Description
Mains Supply
The U211B2 is fitted with voltage limiting and can
ătherefore be supplied directly from the mains. The supply
voltage between Pin 2 (+ pol/ ) and Pin 3 builds up
across D1 and R1 and is smoothed by C1. The value of the
series resistance can be approximated using (see
figure 2):
+R1
VM – VS
2 IS
Further information regarding the design of the mains
supply can be found in the data sheets in the appendix.
The reference voltage source on Pin 16 of typ. –8.9 V is
derived from the supply voltage and is used for
regulation.
Operation using an externally stabilised DC voltage is not
recommended.
If the supply cannot be taken directly from the mains
because the power dissipation in R1 would be too large,
then the circuit shown in the following figure 3 should be
used.
When the potential on Pin 7 reaches the nominal value
predetermined at Pin 12, then a trigger pulse is generated
whose width tp is determined by the value of C2 (the value
of C2 and hence the pulse width can be evaluated by
assuming 8 ms/nF). At the same time, a latch is set, so that
as long as the automatic retriggering has not been
activated, then no more pulses can be generated in that
half cycle.
The current sensor on Pin 1 ensures that, for operations
with inductive loads, no pulse will be generated in a new
half-cycle as long as a current from the previous half
cycle is still flowing in the opposite direction to the
supply voltage at that instant. This makes sure that “gaps”
in the load current are prevented.
The control signal on Pin 12 can be in the range 0 V to
–7 V (reference point Pin 2).
If V12 = –7 V then the phase angle is at maximum = amax
i.e., the current flow angle is a minimum. The phase angle
amin is minimum when V12 = V2.
~
24 V~
12345
R1 C1
95 10362
Figure 3. Supply voltage for high current requirements
Voltage Monitoring
As the voltage is built up, uncontrolled output pulses are
avoided by internal voltage surveillance. At the same
time, all of the latches in the circuit (phase control, load
limit regulation, soft start) are reset and the soft-start
capacitor is short circuited. Used with a switching
hysteresis of 300 mV, this system guarantees defined
start-up behavior each time the supply voltage is switched
on or after short interruptions of the mains supply.
Phase Control
There is a general explanation in the data sheet,
TEA1007, on the common phase control function. The
phase angle of the trigger pulse is derived by comparing
the ramp voltage (which is mains synchronized by the
voltage detector) with the set value on the control input
Pin 12. The slope of the ramp is determined by C2 and its
charging current. The charging current can be varied
using R2 on Pin 6. The maximum phase angle amax can
also be adjusted using R2.
Soft-Start
As soon as the supply voltage builds up (t1), the integrated
soft-start is initiated. The figure below shows the
behaviour of the voltage across the soft-start capacitor
and is identical with the voltage on the phase control input
on Pin 12. This behaviour guarantees a gentle start-up for
the motor and automatically ensures the optimum run-up
time.
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
3 (20)