Philips TDA1023T-N3, TDA1023-N3 Datasheet

INTEGRATED CIRCUITS

DATA SHEET

TDA1023/T

Proportional-control triac triggering circuit

Product specification

May 1991

Supersedes data of August 1982

File under Integrated Circuits, IC02

Philips Semiconductors	Product specification
Proportional-control triac triggering circuit	TDA1023/T

FEATURES

∙Adjustable width of proportional range

∙Adjustable hysteresis

∙Adjustable width of trigger pulse

∙Adjustable repetition timing of firing burst

∙Control range translation facility

∙Fail safe operation

∙Supplied from the mains

∙Provides supply for external temperature bridge

QUICK REFERENCE DATA

APPLICATIONS

∙Panel heaters

∙Temperature control

GENERAL DESCRIPTION

The TDA1023 is a bipolar integrated circuit for controlling triacs in a proportional time or burst firing mode. Permitting precise temperature control of heating equipment it is especially suited to the control of panel heaters.

It generates positive-going trigger pulses but complies with regulations regarding mains waveform distortion and RF interference.

SYMBOL	PARAMETER	MIN.	TYP.	MAX.	UNIT
VCC	supply voltage (derived from mains voltage)	−	13.7	−	V
VZ	stabilized supply voltage for temperature bridge	−	8	−	V
I16(AV)	supply current (average value)	−	10	−	mA
tw	trigger pulse width	−	200	−	μs
Tb	firing burst repetition time at CT = 68 μF	−	41	−	s
-IOH(1)	output current	−	−	150	mA
Tamb	operating ambient temperature range	−20	−	+75	°C

Note

1.Negative current is defined as conventional current flow out of a device. A negative output current is suited for positive triac triggering.

ORDERING INFORMATION

EXTENDED			PACKAGE
TYPE NUMBER	PINS	PIN POSITION		MATERIAL	CODE
TDA1023	16	DIL		plastic	SOT38(1)
TDA1023T	16	mini-pack		plastic	SO16; SOT109A(2)

Note

1.TDA1023: 16 DIL; plastic (SOT38); SOT38-1; 1996 November 27.

2.TDA1023T: 16 mini-pack; plastic (SO16; SOT109A); SOT109-1; 1996 November 27.

May 1991

2

Philips Semiconductors	Product specification
Proportional-control triac triggering circuit	TDA1023/T

					Fig.1	Block diagram.
								PINNING
								SYMBOL	PIN	DESCRIPTION
								Rpd	1	internal pull-down resistor
handbook, halfpage								n.c.	2	not connected
Rpd		1		16	RX			Q	3	output
n.c.		2		15	n.c.			HYS	4	hysteresis control input
Q								PR	5	proportional range control input
		3		14	VCC
								CI	6	control input
HYS		4	TDA1023	13	VEE
								UR	7	unbuffered reference input
PR		5		12	TB			QR	8	output of reference buffer
CI		6		11	VZ			BR	9	buffered reference input
UR		7		10	PW			PW	10	pulse width control input
								VZ	11	reference supply output
QR		8		9	BR
			MBA484					TB	12	firing burst repetition time control
										input
								VEE	13	ground
								VCC	14	positive supply
Fig.2		Pin configuration.						n.c.	15	not connected
								RX	16	external resistor connection

May 1991

3

Philips Semiconductors	Product specification
Proportional-control triac triggering circuit	TDA1023/T

FUNCTIONAL DESCRIPTION

The TDA1023 generates pulses to trigger a triac. These pulses coincide with the zero excursions of the mains voltage, thus minimizing RF interference and mains supply transients. In order to gate the load on and off, the trigger pulses occur in bursts thus further reducing mains supply pollution. The average power in the load is varied by modifying the duration of the trigger pulse burst in accordance with the voltage difference between the control input CI and the reference input, either UR or BR.

Power supply: VCC, RX and Vz (pins 14, 16 and 11)

The TDA1023 is supplied from the AC mains via a resistor RD to the RX connection (pin 16); the VEE connection (pin 13) is linked to the neutral line (see Fig.4a). A smoothing capacitor CS should be coupled between the VCC and VEE connections.

A rectifier diode is included between the RX and VCC connections whilst the DC supply voltage is limited by a chain of stabilizer diodes between the RX and VEE connections (see Fig.3).

A stabilized reference voltage (VZ) is available at pin 11 to power an external temperature sensing bridge.

Supply operation

During the positive mains half-cycles the current through the external voltage dropping resistor RD charges the external smoothing capacitor CS until RX attains the stabilizing potential of the internal stabilizing diodes. RD should be selected to be capable of supplying the current

ICC for the TDA1023, the average output current I3(AV), recharge the smoothing capacitor CS and provide the

supply for an external temperature bridge. (see Figs 9 to 12). Any excess current is by-passed by the internal stabilizer diodes. The maximum rated supply current, however, must not be exceeded.

During the negative mains half-cycles external smoothing capacitor CS supplies the sum of the current demand described above. Its capacitance must be sufficiently high to maintain the supply voltage above the specified minimum.

Dissipation in resistor RD is halved by connecting a diode in series (see Fig.4b and 9 to 12). A further reduction in dissipation is possible by using a high quality dropping capacitor CD in series with a resistor RSD (see Figs 4c and 14). Protection of the TDA1023 and the triac against mains-borne transients can be provided by connecting a suitable VDR across the mains input.

Control and reference inputs CI, BR and UR (pins 6, 9 and 7)

For the control of room temperature (5 °C to 30 °C) optimum performance is obtained by using the translation circuit. The buffered reference input BR (pin 9) is used as a reference input whilst the output reference buffer QR (pin 8) is connected to the unbuffered reference input UR (pin 7). This ensures that the range of room temperature is encompassed in most of the rotation of the potentiometer to give a linear temperature scale with accurate setting.

Should the translation circuit not be required, the unbuffered reference input UR (pin 7) is used as a reference input. The buffered reference input BR (pin 9) must then be connected to the reference supply output VZ (pin 11).

For proportional power control the unbuffered reference input UR (pin 7) must be connected to the firing burst repetition time control input TB (pin 12).The buffered reference input BR (pin 9), which is in this instance inactive, must then be connected to the reference supply output VZ (pin 11).

Proportional range control input PR (pin 5)

The output duty factor changes from 0% to 100% by a variation of 80 mV at the control input CI (pin 6) with the proportional range control input PR open. For temperature control this corresponds to a temperature difference of 1 K.

By connecting the proportional range control input PR (pin 5) to ground the range may be increased to 400 mV, i.e. 5 K. Intermediate values may be obtained by connecting the PR input to ground via a resistor R5

(see Table 1).

Hysteresis control input HYS (pin 4)

With the hysteresis control input HYS (pin 4) open, the device has a built-in hysteresis of 20 mV. For temperature control this corresponds with 0.25 K.

Hysteresis is increased to 320 mV, corresponding to 4 K, by grounding HYS (pin 4). Intermediate values are obtained by connecting pin 4 via resistor R4 to ground. Table 1 provides a set of values for R4 and R5 giving a fixed ratio between hysteresis and proportional range.

May 1991

4

Philips Semiconductors	Product specification
Proportional-control triac triggering circuit	TDA1023/T
Trigger pulse width control input PW (pin 10)
The width of the trigger pulse may be adjusted to the value
required for the triac by choosing the value of the external
synchronization resistor RS between the trigger pulse
width control input PW (pin 10) and the AC mains.
The pulse width is inversely proportional to the input
current (see Fig.13).
Output Q (pin 3)
Since the circuit has an open-emitter output it is capable of
sourcing current. It is thus suited for generating
positive-going trigger pulses. The output is current-limited
and short-circuit protected. The maximum output current is
150 mA and the output pulses are stabilized at 10 V for
output currents up to that value.
To minimize the total supply current and power dissipation,
a gate resistor RG must be connected between the output
Q and the triac gate to limit the output current to the
minimum required by the triac (see Figs 5 to 8).
Pull-down resistor Rpd (pin 1)
The TDA1023 includes a 1.75 kΩ pull-down resistor Rpd
between pins 1 and 13 (VEE, ground connection) intended
for use with sensitive triacs.

LIMITING VALUES

In accordance with the Absolute Maximum System (IEC 134)

SYMBOL	PARAMETER	MIN.	MAX.	UNIT
VCC	DC supply voltage	−	16	V
Supply current
I16(AV)	average	−	30	mA
I16(RM)	repetitive peak	−	100	mA
I16(SM)	non-repetitive peak (tp < 50 μs)	−	2	A
VI	input voltage, all inputs	−	16	V
I6, 7, 9, 10	input current	−	10	mA
V1	voltage on Rpd connection	−	16	V
V3, 8, 11	output voltage, Q, QR, VZ	−	16	V
Output current
-IOH(AV)	average	−	30	mA
-IOH(M)	peak max. 300 μs	−	700	mA
Ptot	total power dissipation	−	500	mW
Tstg	storage temperature range	−55	+150	°C
Tamb	operating ambient temperature range	−20	+75	°C

May 1991

5

Philips Semiconductors				Product specification
Proportional-control triac triggering circuit				TDA1023/T
CHARACTERISTICS
VCC = 11 to 16 V; Tamb = −20 to +75 °C unless otherwise specified
SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.	MAX.	UNIT
Supply
VCC	internally stabilized supply voltage at		12	13.7	15	V
	I16 = 10 mA
VCC/ I16	variation with I16		−	30	−	mV/mA
I16	supply current at V16-13 = 11 to 16 V;	pins 4 and 5 open	−	−	6	mA
	I10 = 1mA; f = 50 Hz; pin 11 open;
	V6-13 > V7-13
		pins 4 and 5 grounded	−	−	7.1	mA
Reference supply output VZ (pin 11) for external temperature bridge
V11-13	output voltage		−	8	−	V
−I11	output current		−	−	1	mA
Control and reference inputs CI, BR and UR (pins 6, 9 and 7)
V6-13	input voltage to inhibit the output		−	7.6	−	V
I6, 7, 9	input current	V1 = 4 V	−	−	2	μA
Hysteresis control input HYS (pin 4)
V6	hysteresis	pin 4 open	9	20	40	mV
V6	hysteresis	pin 4 grounded	−	320	−	mV
Proportional control range input PR (pin 5)
V6	proportional range	pin 5 open	50	80	130	mV
V6	proportional range	pin 5 grounded	−	400	−	mV
Pulse width control input PW (pin 10)
tw	pulse width	I10(RMS) = 1mA; f = 50 Hz	100	200	300	μs
Firing burst repetition time control input TB (pin 12)
TbCT	firing burst repetition time, ratio to		320	600	960	ms/μF
	capacitor CT
Output of reference buffer QR (pin 8)
	output voltage at input voltage:
V8-13		V9-13 = 1.6 V	−	3.2	−	V
V8-13		V9-13 = 4.8 V	−	4.8	−	V
V8-13		V9-13 = 8 V	−	6.4	−	V
Output Q (pin 3)
VOH	output voltage HIGH	−IOH = 150 mA	10	−	−	V
−IOH	output current HIGH		−	−	150	mA
Internal pull-down resistor Rpd (pin 1)
Rpd	resistance to VEE		1	1.75	3	kΩ

May 1991

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