Motorola TDA1085C Datasheet

Device
Operating
Temperature Range
Package

SEMICONDUCTOR
TECHNICAL DATA
SPEED CONTROLLER
ORDERING INFORMATION
TDA1085CD TDA1085C
TJ = – 10° to +120°C
SO–16
Plastic DIP
Order this document by TDA1085C/D
PLASTIC PACKAGE
CASE 648
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO–16)
16
1
16
1
1
MOTOROLA ANALOG IC DEVICE DATA
   
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
Figure 1. Representative Block Diagram and Pin Connections
Reset
Control
Amp.
=
–V
CC
Current
Limiter
0.7 V
+
Ramp
Generator
Speed
Detector
Shunt Regulator
Ballast Resistor
+ V
CC
Monitoring
Voltage
Reg
Digital Speed Sense
F/VC Pump Capacitor
Actual Speed
Set Speed
Ramp Current Gen. Control
Motor Current Limit
Ramp Gen. Timing
Closed Loop Stability
Sawtooth Capacitor
Sawtooth Set Current
Voltage Synchronization
Current Synchronization
Trigger Pulse Output
Trigger Pulse
Gen.
9
10
8
12 11 4 5 6 3 7 16 14 15 2 1 13
Motorola, Inc. 1995
TDA1085C
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
(TA = 25°C, voltages are referenced to Pin 8, ground)
Rating
Symbol Value Unit
Power Supply, when externally regulated, V
Pin 9
V
CC
15 V
Maximum Voltage per listed pin
Pin 3 Pin 4–5–6–7–13–14–16 Pin 10
V
Pin
+ 5.0
0 to + V
CC
0 to + 17
V
Maximum Current per listed pin
Pin 1 and 2 Pin 3 Pin 9 (VCC) Pin 10 shunt regulator Pin 12 Pin 13
I
Pin
– 3.0 to + 3.0
– 1.0 to + 0
15 35
– 1.0 to + 1.0
– 200
mA
Maximum Power Dissipation P
D
1.0 W
Thermal Resistance, Junction–to–Air R
θJA
65 °C/W
Operating Junction Temperature T
J
– 10 to + 120 °C
Storage Temperature Range T
stg
– 55 to + 150 °C
ELECTRICAL CHARACTERISTICS (T
A
= 25°C)
Characteristic
Symbol Min Typ Max Unit
VOLTAGE REGULATOR
Internally Regulated Voltage (V
Pin 9
)
(I
Pin 7
= 0, I
Pin 9
+ I
Pin 10
= 15 mA, I
Pin 13
= 0)
V
CC
15 15.3 15.6 V
VCC Temperature Factor TF – 100 ppm/°C Current Consumption (I
Pin 9
) (V9 = 15 V, V12 = V8 = 0, I1 = I2 = 100 µA, all other pins not connected)
I
CC
4.5 6.0 mA
VCC Monitoring Enable Level
VCC Monitoring Disable Level
VCC EN
VCC DIS
— —
VCC– 0.4 VCC– 1.0
— —
V
RAMP GENERATOR
Reference Speed Input Voltage Range V
Pin 5
0.08 13.5 V
Reference Input Bias Current – I
Pin 5
0 0.8 1.0 µA
Ramp Selection Input Bias Current – I
Pin 6
0 1.0 µA
Distribution Starting Level Range V
DS
0 2.0 V
Distribution Final Level
V
Pin 6
= 0.75 V
VDF/V
DS
2.0 2.09 2.2
High Acceleration Charging Current
V
Pin 7
= 0 V
V
Pin 7
= 10 V
– I
Pin 7
1.0
1.0
1.2
1.7
1.4
mA
Distribution Charging Current
V
Pin 7
= 2.0 V
– I
Pin 7
4.0 5.0 6.0 µA
TDA1085C
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued)
Characteristic
Symbol Min Typ Max Unit
CURRENT LIMITER
Limiter Current Gain — I
Pin 7/IPin 3
(I
Pin3
= – 300 µA)
C
g
130 180 250
Detection Threshold Voltage
I
Pin 3
= – 10 µA
V
Pin 3 TH
50 65 80 mV
FREQUENCY TO VOLTAGE CONVERTER
Input Signal “Low Voltage” Input Signal “High Voltage” Monitoring Reset Voltage
V12
L
V12
H
V12
R
–100 +100
5.0
— — —
— — —
mV mV
V
Negative Clamping Voltage
I
Pin 12
= – 200 µA
– V12
CL
0.6 V
Input Bias Current – I
Pin12
25 µA
Internal Current Source Gain
G
+
I
Pin4
I
Pin11
,V
Pin4
+
V
Pin11
+
0
G.0 9.5 11
Gain Linearity versus Voltage on Pin 4
(G
8.6
= Gain for V
Pin 4
= 8.6 V) V4 = 0 V V4 = 4.3 V V4 = 12 V
G/G
8.6
1.04
1.015
0.965
1.05
1.025
0.975
1.06
1.035
0.985
Gain Temperature Effect (V
Pin 4
= 0) TF 350 ppm/°C
Output Leakage Current (I
Pin 11
= 0) – I
Pin 4
0 100 nA
CONTROL AMPLIFIER
Actual Speed Input Voltage Range V
Pin 4
0 13.5 V
Input Offset Voltage V
Pin 5
– V
Pin 4
(I
Pin 16
= 0, V
Pin 16
= 3.0 and 8.0 V)
V
off
0 50 mV
Amplifier Transconductance
(I
Pin 16
/ (V5 – V4)
(I
Pin 16
= + and – 50 µA, V
Pin 16
= 3.0 V)
T 270 340 400 µA/V
Output Current Swing Capability
Source Sink
I
Pin 16
– 200
50
– 100
100
– 50
200
µA
Output Saturation Voltage V16
sat
0.8 V
TRIGGER PULSE GENERATOR
Synchronization Level Currents
Voltage Line Sensing Triac Sensing
I
Pin 2
I
Pin 1
— —
± 50 ± 50
± 100 ± 100
µA
Trigger Pulse Duration (C
Pin 14
= 47 nF, R
Pin 15
= 270 kΩ) T
p
55 µs
Trigger Pulse Repetition Period, conditions as a.m. T
R
220 µs
Output Pulse Current V
Pin 13
= VCC – 4.0 V – I
Pin 13
180 192 mA
Output Leakage Current V
Pin 13
= – 3.0 V I13
L
30 µA
Full Angle Conduction Input Voltage V
14
11.7 V
Saw Tooth “High” Level Voltage V14
H
12 12.7 V
Saw Tooth Discharge Current, I
Pin15
= 100 µA I
Pin 14
95 105 µA
TDA1085C
4
MOTOROLA ANALOG IC DEVICE DATA
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
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.
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:
To let 1.0 mA flow through Pin 10 when AC line is minimum and V
CC
consumption is maximum (fast ramps and pulses present).
To let V
10
reach 3.0 V when AC line provides maximum current and
VCC consumption is minimum (no ramps and no pulses).
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 doesnt need any tuning. During e very positive cycle at Pin 12, the c apacitor C
Pin 11
is charged to almost VCC and during this time, Pin 4 delivers a current which is 10 times the one charging C
Pin 11
. The current source gain is called G and is tightly
specified, but nevertheless requires an adjustment on R
Pin 4
. The
current into this resistor is proportional to C
Pin 11
and to the motor
speed; being filtered by a capacitor, V
Pin 4
becomes smothered
and represents the “true actual motor speed”. To maintain linearity into the high speed range, it is important to verify
that C
Pin 11
is fully charged: the internal source on Pin 11 has 100K
impedance. Nevertheless C
Pin 11
has to be as high as possible as it has a large influence on FV/C temperature factor. A 470 K 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.
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
Pin 7
up to the moment
V
Pin 5
(set speed) equals V
Pin 4
(true speed), see Figure 2. The IC 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:
Presence of high acceleration ramp V
Pin 5
> V
Pin 4
Distribution occurs in the V
Pin 4
range (true motor speed) defined
by V
Pin 6
x V
Pin 4
x 2.0 V
Pin 6
For two fixed values of V
Pin 5
and V
Pin 6
, the motor speed will have
high acceleration, excluding the time for V
Pin 4
to go from V
Pin 6
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
Pin 6
= 0, only t he high acceleration ramp
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
CC
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.
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