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TDA1085C
Universal Motor
Speed Controller
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.
Features
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•
•
•
•
•
•
•
•
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 Performed by Monitor
Pb-Free Package is Available*
16
1
PDIP-16
C SUFFIX
CASE 648
PLASTIC PACKAGE
MARKING DIAGRAM
MAXIMUM RATINGS
(T
A
= 25°C, voltages are referenced to Pin 8, ground)
Rating
Power Supply, when externally regulated,
V
Pin 9
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 (V
CC
)
Pin 10 shunt regulator
Pin 12
Pin 13
Electrostatic Discharge Sensitivity (ESD)
Human Body Model Class 1B,
JESD22 A114-C
Machine Model Class A, JESD22 A115-A
Charge Device Model Class IV,
JESD22 C101-C
Maximum Power Dissipation
Thermal Resistance, Junction-to-Air
Operating Junction Temperature
Storage Temperature Range
Symbol
V
CC
V
Pin
+5.0
0 to +V
CC
0 to +17
I
Pin
-3.0 to +3.0
-1.0 to +0
15
35
-1.0 to +1.0
-200
-
-
-
P
D
R
qJA
T
J
T
stg
500
100
2000
1.0
65
-10 to +120
-55 to +150
V
V
V
W
°C/W
°C
°C
mA
Value
15
Unit
V
1
V
TDA1085C
A
WL
YY
WW
G
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
16
TDA1085C
AWLYYWWG
ORDERING INFORMATION
Device
TDA1085C
TDA1085CG
Package
PDIP-16
PDIP-16
(Pb-Free)
Shipping
25 Units / Rail
25 Units / Rail
Stresses exceeding Maximum Ratings may damage the device. Maximum
Ratings are stress ratings only. Functional operation above the Recommended
Operating Conditions is not implied. Extended exposure to stresses above the
Recommended Operating Conditions may affect device reliability.
*For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2007
1
July, 2007 - Rev. 10
Publication Order Number:
TDA1085C/D
TDA1085C
+ V
CC
Shunt Regulator
Ballast Resistor
9
10
8
Voltage
Reg
Monitoring
Reset
Speed
Detector
Ramp
Generator
-
+
Control
Amp
Trigger Pulse
Gen.
0.7 V
=
Current
Limiter
12
11
4
5
6
3
-V
CC
7
16
14
15
2
1
13
Ramp Gen. Timing
Ramp Current Gen. Control
F/VC Pump Capacitor
Sawtooth Set Current
Motor Current Limit
Actual Speed
Set Speed
Sawtooth Capacitor
Current Synchronization
Closed Loop Stability
Figure 1. Representative Block Diagram and Pin Connections
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C)
Characteristic
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
Temperature Factor
Current Consumption (I
Pin 9
)
(V
9
= 15 V, V
12
= V
8
= 0, I
1
= I
2
= 100
mA,
all other pins not connected)
V
CC
Monitoring Enable Level
V
CC
Monitoring
Disable Level
RAMP GENERATOR
Reference Speed Input Voltage Range
Reference Input Bias Current
Ramp Selection Input Bias Current
Distribution Starting Level Range
Distribution Final Level
V
Pin 6
= 0.75 V
High Acceleration Charging Current
V
Pin 7
= 0 V
V
Pin 7
= 10 V
Distribution Charging Current
V
Pin 7
= 2.0 V
V
Pin 5
- I
Pin 5
- I
Pin 6
V
DS
V
DF
/V
DS
- I
Pin 7
1.0
1.0
- I
Pin 7
4.0
-
1.2
5.0
1.7
1.4
7.0
mA
0.08
0
0
0
2.0
-
0.8
-
-
2.09
13.5
1.0
1.0
2.0
2.2
mA
V
mA
mA
V
V
CC
TF
I
CC
15
-
-
15.3
- 100
4.5
16
-
6.0
V
ppm/°C
mA
Symbol
Min
Typ
Max
Unit
V
CC
EN
V
CC
DIS
-
-
V
CC
- 0.4
V
CC
- 1.0
Voltage Synchronization
-
-
Trigger Pulse Output
Digital Speed Sense
V
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2
TDA1085C
ELECTRICAL CHARACTERISTICS
(continued)
Characteristic
CURRENT LIMITER
Limiter Current Gain — I
Pin 7
/I
Pin 3
(I
Pin3
= - 300
mA)
Detection Threshold Voltage
I
Pin 3
= - 10
mA
FREQUENCY TO VOLTAGE CONVERTER
Input Signal “Low Voltage”
Input Signal “High Voltage”
Monitoring Reset Voltage
Negative Clamping Voltage
I
Pin 12
= - 200
mA
Input Bias Current
Internal Current Source Gain
I
G
+
Pin 4 , V
+
V
+
0
Pin 4
Pin 11
I
Pin 11
Gain Linearity versus Voltage on Pin 4
(G
8.6
= Gain for V
Pin 4
= 8.6 V)
V
4
= 0 V
V
4
= 4.3 V
V
4
= 12 V
Gain Temperature Effect (V
Pin 4
= 0)
Output Leakage Current (I
Pin 11
= 0)
CONTROL AMPLIFIER
Actual Speed Input Voltage Range
Input Offset Voltage V
Pin 5
- V
Pin 4
(I
Pin 16
= 0, V
Pin 16
= 3.0 and 8.0 V)
Amplifier Transconductance
(I
Pin 16
/D (V
5
- V
4
)
(I
Pin 16
= + and - 50
mA,
V
Pin 16
= 3.0 V)
Output Current Swing Capability
Source
Sink
Output Saturation Voltage
TRIGGER PULSE GENERATOR
Synchronization Level Currents
Voltage Line Sensing
Triac Sensing
Trigger Pulse Duration (C
Pin 14
= 47 nF, R
Pin 15
= 270 kW)
Trigger Pulse Repetition Period, conditions as a.m.
Output Pulse Current V
Pin 13
= V
CC
- 4.0 V
Output Leakage Current V
Pin 13
= - 3.0 V
Full Angle Conduction Input Voltage
Saw Tooth “High” Level Voltage
Saw Tooth Discharge Current, I
Pin15
= 100
mA
mA
I
Pin 2
I
Pin 1
T
p
T
R
- I
Pin 13
I
13 L
V
14
V
14 H
I
Pin 14
-
-
-
-
180
-
-
12
90
±
50
±
50
55
220
192
-
11.7
-
-
±
100
±
100
-
-
-
30
-
12.7
105
ms
ms
mA
mA
V
V
mA
V
Pin 4
V
off
T
0
0
270
-
-
340
13.5
50
400
V
mV
mA/V
V
12 L
V
12 H
V
12 R
- V
12 CL
- I
Pin12
G.0
-100
+100
5.0
-
-
9.5
-
-
-
0.6
25
-
-
-
-
-
-
11
mV
mV
V
V
mA
C
g
V
Pin 3 TH
130
50
180
65
250
80
mV
Symbol
Min
Typ
Max
Unit
G/G
8.6
1.04
1.015
0.965
TF
- I
Pin 4
-
0
1.05
1.025
0.975
350
-
1.06
1.035
0.985
-
100
ppm/°C
nA
I
Pin 16
- 200
50
V
16 sat
-
- 100
100
-
- 50
200
0.8
mA
V
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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 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 smothering
capacitor, the voltage of which is checked by the IC.
When V
CC
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 V
CC
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 V
CC
smoothing and helps to remove noise from set
speeds.
Speed Sensing (Pins 4, 11, 12)
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 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 inexpensive tachogenerator
which doesn′t need any tuning. During every positive cycle at
Pin 12, the capacitor C
Pin 11
is charged to almost V
CC
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 100 KW 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 KW resistor between Pins 11 and 9 reduces leakage
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
mA
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 the 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.
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