Motorola TDA1085CD Datasheet

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The TDA1085C is a phase angle triac controller having all the necessary functions for universal motor speed control in washing machines. It operates in closed loop configuration and provides two ramp possibilities.

• On–Chip Frequency to Voltage Converter

• On–Chip Ramps Generator

• Soft–Start

• Load Current Limitation

• Tachogenerator Circuit Sensing

• Direct Supply from AC Line

• Security Functions Peformed by Monitor

UNIVERSAL MOTOR

SPEED CONTROLLER

SEMICONDUCTOR

TECHNICAL DATA

PLASTIC PACKAGE

CASE 648

ORDERING INFORMATION

Operating

Device

TDA1085CD TDA1085C

Temperature Range

TJ = – 10° to +120°C

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

Package

SO–16

Plastic DIP

Figure 1. Representative Block Diagram and Pin Connections

+ V

Shunt Regulator

Ballast Resistor

Voltage

Reg

Speed

Detector

12 11 4 5 6 3 7 16 14 15 2 1 13

Set Speed

Actual Speed

Digital Speed Sense

F/VC Pump Capacitor

MOTOROLA ANALOG IC DEVICE DATA

Monitoring

Ramp

Generator

Current

Ramp Current Gen. Control

Limiter

Reset

– +

Control

Amp.

0.7 V

–V

Motor Current Limit

Ramp Gen. Timing

 Motorola, Inc. 1996 Rev 5

Trigger Pulse

Gen.

Sawtooth Capacitor

Closed Loop Stability

Sawtooth Set Current

Voltage Synchronization

Trigger Pulse Output

Current Synchronization

MAXIMUM RATINGS

Power Supply, when externally regulated, V Maximum Voltage per listed pin

Pin 3 Pin 4–5–6–7–13–14–16 Pin 10

Maximum Current per listed pin

Pin 1 and 2 Pin 3 Pin 9 (VCC) Pin 10 shunt regulator Pin 12

Pin 13 Maximum Power Dissipation P Thermal Resistance, Junction–to–Air R Operating Junction Temperature T Storage Temperature Range T

(TA = 25°C, voltages are referenced to Pin 8, ground)

Rating Symbol Value Unit

Pin 9

TDA1085C

θJA

stg

– 3.0 to + 3.0

– 1.0 to + 1.0

– 10 to + 120 °C

– 55 to + 150 °C

15 V

+ 5.0

0 to + V

0 to + 17

– 1.0 to + 0

15 35

– 200

1.0 W 65 °C/W

ELECTRICAL CHARACTERISTICS (T

Characteristic

VOLTAGE REGULATOR

Internally Regulated Voltage (V

= 0, I

Pin 7

VCC Temperature Factor TF — – 100 — ppm/°C Current Consumption (I

(V9 = 15 V, V12 = V8 = 0, I1 = I2 = 100 µA, all other pins not connected)

VCC Monitoring Enable Level

VCC Monitoring Disable Level

RAMP GENERATOR

Reference Speed Input Voltage Range V Reference Input Bias Current – I Ramp Selection Input Bias Current – I Distribution Starting Level Range V Distribution Final Level

= 0.75 V

Pin 6

High Acceleration Charging Current

= 0 V

Pin 7

= 10 V

Pin 7

Distribution Charging Current

= 2.0 V

Pin 7

Pin 9

+ I

Pin 10

Pin 9

= 15 mA, I

)

Pin 13

= 25°C)

= 0)

Symbol Min Typ Max Unit

VCC EN

VCC DIS

Pin 5

Pin 5 Pin 6

VDF/V

– I

Pin 7

– I

Pin 7

15 15.3 15.6 V

— 4.5 6.0 mA

— —

0.08 — 13.5 V 0 0.8 1.0 µA 0 — 1.0 µA 0 — 2.0 V

2.0 2.09 2.2

1.0

4.0 5.0 6.0 µA

VCC– 0.4 VCC– 1.0

—

1.2

— —

1.7

1.4

MOTOROLA ANALOG IC DEVICE DATA

TDA1085C

ELECTRICAL CHARACTERISTICS (continued)

Characteristic Symbol Min Typ Max Unit

CURRENT LIMITER

Limiter Current Gain — I

= – 300 µA)

Pin3

Detection Threshold Voltage

= – 10 µA

Pin 3

FREQUENCY TO VOLTAGE CONVERTER

Input Signal “Low Voltage” Input Signal “High Voltage” Monitoring Reset Voltage

Negative Clamping Voltage

= – 200 µA

Pin 12

Input Bias Current – I Internal Current Source Gain

Pin4

Gain Linearity versus Voltage on Pin 4

8.6

V4 = 0 V V4 = 4.3 V

V4 = 12 V Gain Temperature Effect (V Output Leakage Current (I

CONTROL AMPLIFIER

Actual Speed Input Voltage Range V Input Offset Voltage V

Pin 16

Amplifier Transconductance

Pin 16

Output Current Swing Capability

Source

Sink Output Saturation Voltage V16

TRIGGER PULSE GENERATOR

Synchronization Level Currents

Voltage Line Sensing

Triac Sensing Trigger Pulse Duration (C Trigger Pulse Repetition Period, conditions as a.m. T Output Pulse Current V Output Leakage Current V Full Angle Conduction Input Voltage V Saw Tooth “High” Level Voltage V14 Saw Tooth Discharge Current, I

Pin11

= Gain for V

= 0, V

/∆ (V5 – V4) = + and – 50 µA, V

Pin 7/IPin 3

Pin4

Pin 4

Pin 5

= 3.0 and 8.0 V)

Pin 16

Pin 13

Pin 3 TH

V12 V12

– V12

Pin11

= 8.6 V)

Pin 4

Pin 11

– V

Pin 14

Pin 13

G/G

= 0) TF — 350 — ppm/°C = 0) – I

Pin 4

= 3.0 V)

Pin 16

= 47 nF, R

= VCC – 4.0 V – I

= – 3.0 V I13

= 100 µA I

Pin15

= 270 kΩ) T

Pin 15

V12

L H R

Pin12 G.0 9.5 — 11

8.6

Pin 4

off

T 270 340 400 µA/V

Pin 16

sat

Pin 2

Pin 1

Pin 13

Pin 14

130 180 250

50 65 80 mV

–100 +100

5.0 — 0.6 — V

— 25 — µA

1.04

1.015

0.965

0 — 100 nA

0 — 13.5 V 0 — 50 mV

– 200

50 — — 0.8 V

— —

— 55 — µs — 220 — µs

180 192 — mA

— — 30 µA — 11.7 — V 12 — 12.7 V 95 — 105 µA

— — —

1.05

1.025

0.975

– 100

100

± 50 ± 50

— — —

1.06

1.035

0.985

– 50

200

± 100 ± 100

mV mV

µA

MOTOROLA ANALOG IC DEVICE DATA

TDA1085C

GENERAL DESCRIPTION

The TDA 1085C triggers a triac accordingly to the speed regulation requirements. Motor speed is digitally sensed by a tachogenerator and then converted into an analog voltage.

The speed set is externally fixed and is applied to the internal linear regulation input after having been submitted to programmable acceleration ramps. The overall result consists in a full motor speed

INPUT/OUTPUT FUNCTIONS

(Refer to Figures 1 and 8)

Voltage Regulator – (Pins 9 and 10) This is a parallel type regulator

able to sink a large amount of current and offering good characteristics. Current flow is provided from AC line by external dropping resistors R1, R2, and rectifier: This half wave current is used to feed a smoothering capacitor, the voltage of which is checked by the IC.

When VCC is reached, the excess of current is derived by another dropping resistor R10 and by Pin 10. These three resistors must be determined in order:

• T o let 1.0 mA flow through Pin 10 when AC line is minimum and V

consumption is maximum (fast ramps and pulses present).

• T o let V

VCC consumption is minimum (no ramps and no pulses).

reach 3.0 V when AC line provides maximum current and

• All along the main line cycle, the Pin 10 dynamic range must not be

exceeded unless loss of regulation. An AC line supply failure would cause shut down. The double capacitive filter built with R1 and R2 gives an efficient

VCC smoothing and helps to remove noise from set speeds. Speed Sensing – (Pins 4, 11, 12) The IC is compatible with an

external analog speed sensing: its output must be applied to Pin 4, and Pin 12 connected to Pin 8.

In most of the applications it is more convenient to use a digital speed sensing with an unexpensive tachogenerator which doesn′t need any tuning. During every positive cycle at Pin 12, the capacitor C time, Pin 4 delivers a current which is 10 times the one charging C specified, but nevertheless requires an adjustment on R current into this resistor is proportional to C speed; being filtered by a capacitor, V and represents the “true actual motor speed”.

T o maintain linearity into the high speed range, it is important to verify that C impedance. Nevertheless C has a large influence on FV/C temperature factor. A 470 KΩ resistor between Pins 11 and 9 reduces leakage currents and temperature factor as well, down to neglectable effects.

Pin 12 also has a monitoring function: when its voltage is above

5.0 V, the trigger pulses are inhibited and the IC is reset. It also senses the tachogenerator continuity, and in case of any circuit aperture, it inhibits pulse, avoiding the motor to run out of control. In the TDA 1085C, Pin 12 is negatively clamped by an internal diode which removes the necessity of the external one used in the former circuit.

. The current source gain is called G and is tightly

Pin 11

is fully charged: the internal source on Pin 11 has 100KΩ

Pin 11

is charged to almost VCC and during this

Pin 11

and to the motor

Pin 11

becomes smothered

Pin 4

has to be as high as possible as it

Pin 11

Pin 4

. The

range with two acceleration ramps which allow efficient washing machine control (Distribute function).

Additionally, the TDA 1085C protects the whole system against AC line stop or variations, overcurrent in the motor and tachogenerator failure.

Ramp Generator – (Pins 5, 6, 7) The true Set Speed value taken in consideration by the regulation is the output of the ramp generator (Pin 7). With a given value of speed set input (Pin 5), the ramp generator charges an external capacitor C V

(set speed) equals V

Pin 5

has an internal charging current source of 1.2mA and delivers it from 0 to 12 V at Pin 7. It is the high acceleration ramp (5.0 s typical) which allows rapid motor speed changes without excessive strains on the mechanics. In addition, the TDA 1085C offers the possibility to break this high acceleration with the introduction of a low acceleration ramp (called Distribution) by reducing the Pin 7 source current down to

5.0 µA under Pin 6 full control, as shown by following conditions:

(true speed), see Figure 2. The IC

Pin 4

• Presence of high acceleration ramp V

• Distribution occurs in the V

by V

For two fixed values of V high acceleration, excluding the time for V to two times this value, high acceleration again, up to the moment the motor has reached the set speed value, at which it will stay, see Figure 3.

Should a reset happen (whatever the cause would be), the above mentioned successive ramps will be fully reprocessed from 0 to the maximum speed. If V occurs.

To get a real zero speed position, Pin 5 has been designed in such a way that its voltage from 0 to 80 mV is interpreted as a true zero. As a consequence, when changing the speed set position, the designer must be sure that any transient zero would not occur: if any, the entire circuit will be reset.

As the voltages applied by Pins 5 and 6 are derived from the internal voltage regulator supply and Pin 4 voltage is also derived from the same source, motor speed (which is determined by the ratios between above mentioned voltages) is totally independent from V variations and temperature factor.

Control Amplifier – (Pin 16) It amplifies the difference between true speed (Pin 4) and set speed (Pin 5), through the ramp generator. Its output available at Pin 16 is a double sense current source with a maximum capability of ± 100 µA and a specified transconductance (340 µA/V typical). Pin 16 drives directly the trigger pulse generator, and must be loaded by an electrical network which compensates the mechanical characteristics of the motor and its load, in order to provide stability in any condition and shortest transient response; see Figure 4.

This network must be adjusted experimentally. In case of a periodic torque variations, Pin 16 directly provides the

phase angle oscillations.

Pin 6

x V

Pin 4

x 2.0 V

Pin 5

Pin 6

range (true motor speed) defined

Pin 4

Pin 6

and V

Pin 6

= 0, only the high acceleration ramp

up to the moment

Pin 7

> V

Pin 5

, the motor speed will have

Pin 4

to go from V

Pin 4

Pin 6

MOTOROLA ANALOG IC DEVICE DATA

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