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TEA1007
Simple Phase Control Circuit
Description
Integrated circuit, TEA1007, is designed as a general phase control circuit in bipolar technology. It has an internal supply voltage limitation. With typical 150 mA ignition pulse, it is possible to determine the phase-shift of the ignition point by comparing the mains sync. ramp voltage with a preset required value. It generates a single ignition pulse per half wave; therefore, it is suitable for capacitive and inductive loads in low cost applications.
Features
D Current consumption
v 2.5 mA
D Internal supply voltage control
Package: DIP8
D Ignition pulse typ. 150 mA D Voltage and current synchronization
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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Rv = series resistance
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Figure 1. Block diagram with typical circuitry
Block Diagram
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TEA1007
General Description
The phase-shift of the ignition point is determined in the usual manner by comparison between a mains synchronized ramp voltage and a predetermined required value. The capacitor Co/t between Pin 7 and the common reference point Pin 8 is discharged at the zero transition of the mains voltage via the Vo detector, gate G2 and switch S2. After the end of the zero transition pulse, Co/t is charged from the constant current source Io, whose value is adjusted externally with Ro at Pin 3 due to the unavoidable tolerance of Co/t (Phase 1). When the potential at Pin 7 reaches the nominal value predetermined at Pin 6, the thyristor Th1, which also functions as a comparator, ignites and sets the following clock flip-flop. The output of the clock flip-flop releases the output amplifier, connects a second constant current source to the capacitor Co/t, and switches the reference voltage switch S1 to an internally generated threshold voltage VRef1 via an RS flip-flop and the OR gate G1. The capacitor Co/t is charged in this second phase by Io + Itp until it reaches the internal reference voltage VRef. The length of this Phase 2 corresponds to the width of the output pulse tp. When the capacitor voltage reaches the value VRef, thyristor Th1 ignites again and resets the clock flip-flop to its initial state. The output pulse is thus terminated and the constant source Itp is switched off. However, the RS flip-flop holds the switch S1 so that the internal reference voltage remains connected to Th1. As VRef is greater than the maximum permissible control voltage at Pin 6, this prevents more than one ignition pulse from being generated in each half-cycle of the mains voltage. This is particularly important because the energy contents of the output pulse is of the same order as the internal requirements of the circuit for each half-wave.
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Vo IO VM IL IG VHI
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Figure 2. Functional diagram for inductive load of amax
In the following zero transition of the mains voltage, the zero transition detector (Input Pin 5) resets the RS flip-flop, discharges Co/t again via S2, and also insures that the clock flip-flop is in the reset condition. A further part of the basic function is the current detector with its input at Pin 4. When controlling inductive loads, the load current lags behind the mains voltage which means that the circuit could generate an ignition pulse during the period in which current is still flowing with a polarity opposite to that of the mains voltage if the current were not taken into account (see figure 2). This, in turn, would lead, to so-called "gaps" in the load current as the next ignition pulse is generated in the subsequent half-cycle.
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Figure 3. Triac voltages + currents at resistive load
= Zero cross voltage = Zero cross current = Mains voltage = Load current = Gate current = Triac voltage at anode HI
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TELEFUNKEN Semiconductors Rev. A1, 28-May-96
TEA1007
In indication as to whether load current is flowing or not is provided by the triac itself. When the triac is ignited, the voltage at electrode H1 drops from the instantaneous value of the mains voltage to approximately 1.5 V, the value of the forward voltage of the triac. When the load current drops below the hold current of the triac towards the end of the half-cycle, VH1 again returns to the instantaneous value of the mains voltage. The current detector with its input at Pin 4 now controls this triac voltage and blocks the pulse generator via G1 and S1 by increasing the reference voltage as long as the triac is conducting. As, in the case of a resistive load, the triac may be extinguished shortly before the zero transition of the mains voltage - when the load current drops below the hold current - the RS flip-flop must prevent any possible second ignition pulse from being generated.
Additional Function
An internal supply voltage control circuit insures that output pulses can be generated only when the supply voltage required for operation of all logic functions is available. Series resistance R1 can be calculated approx. as follows: R 1 max
+ 0.85 V
Itot = IS + IP + Ix whereas
Itot = Total current consumption
IS = Current requirement of the lC
IP = Average current requirement of the triggering pulses Ix = Current requirement of other peripheral components
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R G max
G P
Determination of Gate Series Resistance, Firing Current and Pulse Width
Firing current requirement depends upon the triac used which can be regulated with series resistance as given below:
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[ 12.5 V - V I I t I+ T
G max p
tP
ms [ 8nF
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whereas: VG IG IP T tp Co =Triac's gate voltage =Triac's gate current =Gate current requirement - average =Period duration of mains frequency =(firing) pulse width =Ramp capacitor
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Figure 4. Functional diagram for resistive load and amin
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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M min
2
- V S max I tot
G max
- 110
W
Co
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TEA1007
Absolute Maximum Ratings
Reference point Pin 8 Parameters Current consumption t<10 ms Sync. currents: t<10 ms Input current Input voltages: Power dissipation Tamb = 45C Tamb = 85C Junction temperature Ambient temperature range Storage temperature range Pin 4 Pin 5 Pin 4 Pin 5 Pin 3 Pin 6 Pin 2 Pin 1 Symbol -IS -is IsyncI IsyncV
sync.I sync.V
Value 30 60 10 10 60 60 5
Unit mA mA
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-II -VI VI Ptot Tj Tamb Tstg
Thermal Resistance
Junction ambient
Parameters DIP8 SO8 (P.C.) SO8 (ceramic)
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Symbol RthJA Symbol -VS IS IsyncI. IsyncV
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Min 13.5 IO 8 15 1
Electrical Characteristics
Parameters Mains supply Current consumption Sync. currents Output pulse current Output pulse width Charge current
Reference point Pin 8, unless otherwise specified
Test Conditions / Pin Pin 1 Pin 4 Pin 5
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xV -V xV x2
S S I
mA V
400 225 125 0 to 80 -40 to +125
mW C C C
Value 200 220 140
Unit K/W
Type
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Max 17 2.5
0.35 0.65 90 180 30 64 20
Unit V mA mA mA
VS = 13.5 V, RG = 0, VG = 1.2 V Co/t = 3.3 nF Co/t = 6.8 nF Phase 1" Co/t = 3.3 nF Co/t = 6.8 nF Phase 2" V6 = constant
Pin 2 Pin 2 Pin 7
tp tp Io It Ii
ms mA
mA
Drive current Balance between two half cycles
Pin 7 Pin 6
2 4.3 1.3 0.5
mA
Do
"3
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TELEFUNKEN Semiconductors Rev. A1, 28-May-96
TEA1007
Applications
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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Figure 5. Phase control for fan motors - 230 VX
Figure 6. Two-phase time-switch, 230 VX
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TEA1007
The timing switch using the TEA 1007 permits two-phase operation of loads with conduction angle o adjustable as required (see figure 6). C3 and R22. As the voltage to which C3 is charged increases, the current through Z1 decreases. When the potential at the emitter of T2 has climbed so high that the current through Z1 becomes zero, T1 can no longer conduct. The potential on R21 therefore drops. The conduction angle o decreases to the value omin, adjustable by means of R20 (Phase 2). The transition from omax to omin takes place continuously following the adjustment of R22 and takes ca. 2 to 20 secs. The time constant of Phase 1, which is also determined by R22, begins with the release of key S. If S is pressed again before the end of the time constant, a period equal to the complete time-constant is added to the time already run. The circuit is powered direct from mains via D1 and R1 in every negative half-cycle. C1 smooths the operating voltage which settles at a level of ca. 15.5 V.
o = omax
Period t = 5 to 320 sec Phase 2:
adjustable with R21 adjustable with R22
o = omin
adjustable with R20 Period t = optional, or up to the pressed time of switch S
Phase 1 begins as soon as the mains voltage is applied. The maximum angle of conduction omax can be adjusted by means of R21. The timing circuit comprises T1, T2, Z1,
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Figure 7. Fading circuit for manual operation
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TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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Phase 1:
TEA1007
Dimensions in mm
Package: DIP8
TELEFUNKEN Semiconductors Rev. A1, 28-May-96
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TEA1007
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
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
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1. Meet all present and future national and international statutory requirements.
TELEFUNKEN Semiconductors Rev. A1, 28-May-96

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