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U208B
Open Loop Phase Control Circuit
Description
The integrated circuit, U208B, is designed as a phase control circuit in bipolar technology with internal supply-voltage monitoring. As the voltage is built up, uncontrolled output pulses are avoided by internal monitoring. Furthermore, it has internal-current and voltage synchronisation. It is recommended as a low cost open-loop control.
Features
D Automatic retriggering D Triggering pulse typ. 125 mA D Voltage and current synchronisation D Internal supply voltage monitoring D Current requirement 2.5 mA
Package: DIP8
Block Diagram
BYT77 18 kW/ 2W R3 220 kW/ 0.5 W 7 Voltage detector 8 Current detector Automatic retriggering Output pulse 3 R7 180 W R4 470 kW/ 0.5 W D1 R1 M L
95 11224
TIC 236N
VM = 230 V ~
5 4 R2 180 kW R6 18 kW 100 kW R5 120 kW 6
10 nF C2 -VS C1 22 mF/ 25 V N
Phase control unit o = f (V6)
2 Supply voltage limitation Voltage monitoring 1
GND
Figure 1. Block diagram for simple phase control system
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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U208B
Description
Mains Supply
The U208B is fitted with voltage limiting and can therefore be supplied directly from the mains. The supply voltage between Pin 1 (+ pol/ ) and Pin 2 builds up across D1 and R1 and is smoothed by C1. The value of the series resistance can be approximated using figure 1: R1 When the potential on Pin 5 reaches the given value of Pin 6, 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). The current sensor on Pin 8 ensures that, for operation with inductive loads, no pulse will be generated in a new half cycle as long as the 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 6 can be in the range 0 V to -7 V (reference point Pin 1). If Vpin6 = -7 V then the phase angle is at maximum = amax i.e., the current flow angle is a minimum. The minimum phase angle amin is when Vpin6 = Vpin1.
+ V2 -V I
M S
S
Further information regarding the design of the mains supply can be found in the data sheets in the appendix. Operation using an externally stabilized 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 2 should be employed. ~
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 are reset. 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.
24 V~
1 2 3 4 5
Pulse Output Stage
R1 C1
95 10362
Figure 2. Supply voltage for high current requirements
Phase Control
The function of the phase control is largely identical to that of the well known component TEA1007. The phase angle of the trigger pulse is derived by comparing the ramp voltage, which is mains synchronized by the voltage detector, with the nominal value predetermined at the control input Pin 6. The slope of the ramp is determined by C2 and its charging current. The charging current can be varied using R2 on Pin 4. The maximum phase angle amax can also be adjusted using R2.
The pulse output stage is short circuit protected and can typically deliver currents of 125 mA. For the design of smaller triggering currents, the function IGT = f (RGT) has been given in the data sheets in the appendix. In contrast to the TEA1007, the pulse output stage of the U 208 B has no gate bypass resistor.
Automatic Retriggering
The automatic retriggering prevents half cycles without current flow, even if the triacs is turned off earlier e.g. due to a collector which is not exactly centered (brush lifter) or in the event of unsuccessful triggering. If it is necessary, another triggering pulse is generated after a time lapse of tpp = 4.5 tp and this is repeated until either the triac fires or the half cycle finishes.
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TELEFUNKEN Semiconductors Rev. A1, 28-May-96
U208B
General Hints and Explanation of Terms
To ensure safe and trouble-free operation, the following points should be taken into consideration when circuits are being constructed or in the design of printed circuit boards.
95 10716
V Mains Supply
p/2
p
3/2p
2p
D The connecting lines from C2 to Pin 5 and Pin 1 should
be as short as possible, and the connection to Pin 1 should not carry any additional high current such as e.g. the load current.
VGT Trigger Pulse VL Load Voltage
tp
tpp = 4.5 tp
D When selecting C2, a low temperature coefficient is
desirable.
IL Load Current
o F
Figure 3. Explanation of terms in phase relationship
Absolute Maximum Ratings
Reference point Pin 1, unless otherwise specified Parameters Current requirement q Synchronisation current t < 10 ms t < 10 ms Phase control Input voltage Input current Power dissipation Tamb = 45C Tamb = 80C Storage temperature range Junction temperature Ambient temperature range t 10 ms Pin 2 Pin 8 Pin 7 Pin 8 Pin 7 Pin 6 Pin 6 Pin 4 Symbol -IS -is IsyncI IsyncV Value 30 100 5 5 35 35 0 to 7 500 1 530 300 -40 to +125 125 -10 to +100 Unit mA mA
"i "i
II
I V
"I
-VI
I
mA mW C C C
mA
V
Ptot Tstg Tj Tamb
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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U208B
Thermal Resistance
Junction ambient Parameters DlP8 SO8: on p.c. board SO8: on ceramic Symbol RthJA Value 120 220 140 Unit K/W
Electrical Characteristics
-VS = 13.0 V, Tamb = 25 C, reference point pin 1, unless otherwise specified Parameters Supply voltage for mains operations Supply voltage limitation DC supply current Voltage monitoring Turn-on threshold Turn-off threshold Phase control currents Current synchronisation Voltage synchronisation Voltage limitation Reference ramp Load current Ro-reference voltage Temperature coefficient Pulse output Output pulse current Reverse current Output pulse width Automatic retriggering Repetition rate Test Conditions / Pins Pin 2 -IS = 3 mA -IS = 30 mA -VS = 13 V Pin 2 Pin 2 Pin 2 Pin 2 Pin 8 Pin 7 Pin 8 Pin 7 Pin 5 Pin 4, 2 Pin 4 Symbol -VS -VS -IS -VSON -VSOFF Isync.I Isync.V Min. 13.0 14.6 14.7 1.0 Typ. Max. VLimit 16.6 16.8 2.5 13.0 Unit V V mA V V mA mA V
2.2 11.2 10.9
9.9 0.35 0.35 8.0 8.0 1 1.06
"I = 5 mA
I
figure 4 IS = f(R4)
"V "V
I I
8.9 8.9
3.5 3.5 9.5 9.5 20 1.18
I5 VoRef TCVoRef Io Ior tp tpp
mA
V mV/K mA
1.13 -0.5 125 0.01 80
R7= 0, VGT = 1.2 V Pin 3 Pin 3 Co = 10 nF Pin 5-1 Pin 3, 5
100
150 3.0
mA ms
tp
3
4.5
6
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TELEFUNKEN Semiconductors Rev. A1, 28-May-96
U208B
240 Phase Control Reference Point Pin 2 200 ( ) 10nF 4.7nF P(R1) ( W ) 2.2nF 160 4 3 2 C o/t=1.5nF 1 0 0
95 10302
6 5 Mains Supply
Phase Angle
a
120 80 0 0.2 0.4 0.6 0.8 1.0 Ro ( MW )
0
95 10316
10
20 R1 ( kW )
30
40
Figure 4.
6 5 Mains Supply P(R1) ( W ) 4 I GT ( mA ) 3 2 1 20 0 0
95 10317
Figure 6.
100 Pulse Output 80
60
40
1.4V
VGT = 0.8V
3
6
9
12
15 0 0
95 10313
Itot ( mA )
200
400
Figure 5.
RGT ( W )
600
800
1000
Design Calculations for Mains Supply
The following equations can be used for evaluating the series resistor R1 for worst case conditions: V Mmin - V Smax 0.85 R 1max 2 I tot (V Mmax - V Smin) 2 V Mmax - V Mmin P( R1max) R 1min 2 R1 2 I Smax where: VM = Mains voltage VS = Supply voltage on Pin 4 Itot = Total DC current requirement of the circuit = IS + Ip + Ix IS = Current requirement of the IC in mA Ip = Average current requirement of the triggering pulses Ix = Current requirement of other peripheral components R1 can be easily evaluated from figures 6 and 8
50
Figure 7.
R 1( kW )
+ +
40 Mains Supply 30
+
20 10 0 0 4 8 Itot ( mA ) 12 16
95 10315
Figure 8.
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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U208B
Application
L 230 V~ N M 1N4004 D1 R3 220 kW R1 18 kW/ 1.5 W R4 470 kW 8 7 R5 47 kW C2 1 mF/ 25 V 6 C3 3.3 nF/ 63 V R6 150 kW
R15 100 kW
5
U208B
TIC 236N
1
2
3
4 R2 470 kW
22 mF/ 25 V
C1
95 11225
Figure 9. Phase control (power control) for electric tools
Dimensions in mm
Package: DIP8
94 8873
6 (7)
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
U208B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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