Intersil CA3165E1 Electronic switching circuit Datasheet

CA3165
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May 1999
Electronic Switching Circuit
Features
Description
• Switching Initiated by Damping of Internal Oscillator
The CA3165 is a single chip electronic switching circuit
intended primarily for ignition applications. It includes an
oscillator that is amplitude-modulated by the rotor teeth of a
distributor, a detector that develops the positive going modulation envelope, a Schmitt trigger that eliminates switching
uncertainties. Both types include two complementary high
current switched outputs for driving power transistors requiring up to 120mA. The CA3165E also includes two complementary low current outputs that incorporate internal current
limiting and a non-inverting output amplifier with uncommitted input capable of switching 27mA.
• Proximity Sensing of Rotational Motion
[ /Title (CA3165)
• Repeatable Timing of Switching States
/Subject (Electronic Switching Circuit)
•/Author
Five Outputs
- Two Complementary Pairs and One
()
Non-Inverting Output CA3165E1
/Keywords ()
•/Creator
Two Outputs
() - One Complementary Pair CA3165E
/DOCINFO
pdfmark
Part Number
Information
PART
[ /PageMode
/UseOutlines
NUMBER
TEMPERATURE
/DOCVIEW pdfmark
PACKAGE
CA3165E
-40oC to +85oC
8 Lead Plastic DIP
CA3165E1
-40oC to +85oC
14 Lead Plastic DIP
The CA3165 is supplied in the 8 lead dual-in-line plastic
package (E suffix) and in the 14 lead dual-in-line plastic
package (E1 suffix).
Pinouts
CA3165 (PDIP)
TOP VIEW
CA3165 (PDIP)
TOP VIEW
OSC FB
1
8
FB_RF
SENSE
2
7
V+
GND
3
6
DET_OUT
OUTPUT
4
5
INV_OUT
OSC FB 1
SENSE 2
© Harris Corporation 1999
10-25
13 FB_RF
GND 3
12 V+
OUTPUT 4
11 NC
+SIGNAL 5
10 DET_OUT
INV_OUT 6
9 AMPL_IN
–SIGNAL 7
8 AMPL_OUT
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright
14 NC
File Number
1278.3
CA3165
Functional Block Diagrams
DC SUPPLY 5V - 24V
200Ω
220Ω
TO POWER
TRANSISTORS
3.5V - 18V
12
0.01µF
847Ω
NC
5
4
13
FEEDBACK
RESISTOR
(6kΩ ± 0.5%)
OSCILLATOR
SCHMITT
TRIGGER
DET
1
OUTPUT
SWITCHING
10
2
6
220Ω
OSCILLATOR
CONDITION
7
9
3
6.8KΩ
0.01
R
L = 100µH
Q ≈ 53
0.01µF
REPRESENTS
ROTOR LOADING
1500
pF
OUTPUT
OUTPUT
8
AMP
0.0047µF
100K
TERMINAL 10
TERMINAL 4
TERMINAL 5
TERMINAL 6
TERMINAL 7
TERMINAL 8
Unloaded
Low
High
High
Low
Low
Low
Loaded
High
Low
Low
High
High
High
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM FOR CA3165E1
DC SUPPLY 5V - 24V
200Ω
220Ω
TO POWER
TRANSISTORS
3.5V - 18V
7
0.1µF
300Ω
4
FEEDBACK
RESISTOR
(6.49kΩ)
8
OSCILLATOR
SCHMITT
TRIGGER
DET
1
OUTPUT
5
SWITCHING
INVERTED
OUTPUT
6
2
220Ω
3
0.01
L = 100µH
Q ≈ 53
RA†
RB†
REPRESENTS
ROTOR LOADING
1500
pF
†VALUES OF RA AND RB DETERMINED
BY CORRELATION.
OSCILLATOR
CONDITION
TERMINAL 4
TERMINAL 5
TERMINAL 6
Unloaded
High
High
Low
Loaded
Low
Low
High
FIGURE 2. FUNCTIONAL BLOCK DIAGRAM FOR CA3165E
10-26
Specifications CA3165
Absolute Maximum Ratings
Thermal Information
DC Voltage (With Reference to Terminal 3)
CA3165E1
Terminals 4, 6, 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V
Terminals 5, 7, 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Terminal 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V
CA3165E
Terminals 4, 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V
Terminal 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Current (At Terminals Indicated)
CA3165E1
Terminals 4, 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120mA
Terminals 5, 7 . . . . . . . . . . . . . . . . . . . . . . . . . -0.1mA to 0.1mA
Terminal 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
CA3165E
Terminals 4, 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120mA
Thermal Resistance
θJA
Plastic DIP Package 8 Lead . . . . . . . . . . . . . . . . . . . . . 150oC/W
Plastic DIP Package 14 Lead . . . . . . . . . . . . . . . . . . . . 100oC/W
Operating Temperature Range . . . . . . . . . . . . . . . . . -40oC to +85oC
Storage Temperature Range. . . . . . . . . . . . . . . . . . -65oC to +150oC
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +265oC
At Distance 1/16” ±1/32” (1.59 ±0.79mm) from Case
for 10s Maximum
Device Dissipation Plastic DIP Package 8 Lead
Up to TA = +55oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW
Above TA = +55oC . . . . . . . . . . . . . Derate Linearly at 6.67mW/oC
Device Dissipation Plastic DIP Package 14 Lead
Up to TA = +55oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 950mW
Above TA = +55oC . . . . . . . . . . . . . . .Derate Linearly at 10mW/oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications
At TA = +25oC, V+ = 13V, Measured in the circuit of Figure 5 (CA3165E1) or Figure 6 (CA3165E)
CA3165E1
PARAMETERS
SYMBOL
Input Current at Term. (Note 1)
∆
Output Voltage at Term. 4
V4
TEST CONDITIONS
CA3165E
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Dwell
-
18.4
-
-
18.4
-
mA
Spark
-
17.5
-
-
17.5
-
mA
Dwell
12.8
-
-
12.8
-
-
V
Spark
-
-
0.5
-
-
0.5
V
Output Volatge at Term. 7
V7
Dwell
-
-
1
-
-
-
V
Output Voltage at Term. 8
V8
Dwell
-
-
0.9
-
-
-
V
1.2
-
-
-
-
-
V
Dwell
-
4.4
-
-
4.4
-
Vp-p
Spark
-
0.6
-
-
0.6
-
Vp-p
Portion of Spark
Oscillator Voltage at Term. 2
NOTE:
1. CA3165E at Term. 7
CA3165E1 at Term. 12
V2
∆
I7
I12
10-27
CA3165
Schematic Diagrams
12
ALL RESISTANCES ARE IN KILOHMS
R1
0.18
R2
0.18
Q1
R3
0.18
R4
0.18
Q2
R18
10
R5
0.18
Q3 Q4
R19
6.2
R20
4.3
Q36
Q22 Q23
Q19
Q34
R23
5.1
R22
2.4
Q18
R9
R37
4.5
Q33
Q20
Q6
3.3
Q9
Q32
Q21
R8
1
R36
4.6
R21
2.4
R17
10
Q5
R7
6.2
R6
0.6
9
3.3
Q7
R27
1.8
Q8
Q36
Q25
Q10
R10
0.35
R28
2
R25 Q24
2.1
R24
0.1
Q11
Q13
Q12
R11
2.9
R12
1.8
Q14
2
13
R26 2.1
R29
0.05
R
31
2
R30
0.1
Q27
R15
1
R14
0.1
R13
2
Q16
R16
2.5
Q15
Q28
R32
5
R33
0.1
R34
2
R35
5
Q31
Q30
Q29
8
Q37
Q26
Q39
Q40
Q38
Q17
3
10
4
5
6
7
FIGURE 3. SCHEMATIC DIAGRAM FOR CA3165E1
7
ALL RESISTANCES ARE IN KILOHMS
R1
0.18
R2
0.18
Q3
Q2
Q1
R5
R4
0.18 0.18
R3
0.18
Q4
R18
10
Q5
R19
10
R17
10
R20
4.3
R22
2.4
Q31
Q18
Q16
R6
6.2
Q29
Q19
Q20
Q17
Q33
R7
0.6
R29
4.6
R23
5.1
R21
2.4
Q40
R8
3.3
1
R9
3.3
Q6
Q7
Q24
R25
2.1
Q10
Q32
R24B
2
Q23
R11
0.35
Q41
Q22
R24A
1.8
Q15
Q8
R30
4.5
Q30
R26
2.1
Q9
R16
0.1
Q13
Q11
R12
1.8
R10
2.9
Q12
Q14
Q38
R13
2
Q21
2
R31
0.1
R14
2.5
8
R15
1
R13A
0.1
R15A
0.05
Q25
R32
2
R27
5
R33
0.1
R28
5
Q36
Q26 Q28
Q27
Q35
Q39
3
R34
2
6
4
5
FIGURE 4. SCHEMATIC DIAGRAM FOR CA3165E
10-28
Q37
CA3165
Application Information
Figure 5 and Figure 6 show the application of the CA3165 in a typical ignition system.
TERMINAL DESCRIPTIONS
TERMINAL
CA3165E1
CA3165E
FUNCTION
1
1
Oscillator Feedback Resistor, RF
2
2
220Ω Protective Resistor To Tank Circuit
3
3
Ground
4
4
Direct Output - R7 load resistor 200Ω ± 5%, and R8 to power Darlington 15Ω ± 10%
5
-
Direct Output - Low Current - Not Connected
6
5
Inverted High Current Output
7
-
Inverted Low Current Output Through C1 (0.01µF) to D3 and R3 (100kΩ)
8
-
Output Amplifier Output - Through R6 and R5 (27Ω and 820Ω to Supply)
9
-
Output Amplifier Input - through R4 (6800Ω) to D3 and C5 (0.0047µF)
10
6
Detector Output - C2 to Ground (0.01µF)
11
-
No Connection
12
7
Circuit Supply Voltage Through R1 (220Ω Protective Resistor) to Automotive Supply
13
8
Oscillator Feedback Resistor RF to Terminal 1
14
-
No Connection
AUTOMOTIVE SUPPLY 5V - 24V
C1
0.01µF
H.V.
R1
220
C2
R5
820
0.01µF
R6
27
NC
14
NC
13
12
11
10
9
8
R4
6.8k
H.V.
RF
R7
200
CA3165E1 TOP VIEW
1
R2
220
2
3
4
5
6
C6
0.0047µF
7
NC NC
C4
0.01µF
R3
100k
L1
METALLIC
TRIGGER WHEEL
ONE TOOTH PER
CYLINDER
D2
C3
1500pF
D3
R9
6.8k
R8
15
D4
C5
0.0047
µF
CURRENT
LIMITER
R10
220
R11
≈ 1100
L1 SENSOR COIL INDUCTANCE
≈ 100µH UNLOADED Q ≈ 53
D1
R12
100
R13
0.18
SET FOR 4 AMPERES IN R13
EXCEPT AS NOTED, RESISTOR VALUES IN OHMS
FIGURE 5. TYPICAL IGNITION SYSTEMS USING THE CA3165E1
10-29
CA3165
+13V
820
1W
5%
R1
220
6
7
5
CA3165E
TOP
VIEW
4
3
8
2
1
R6
0.01µF
C6
C3
0.01µF
220
VOUT
6490 ± 0.15%
C2
1500pF
SILVER
MICA
L1
L1 SENSOR COIL,
INDUCTANCE ≈ 100µH,
UNLOADED Q ≈ 53
200
1W
±5%
ALL RESISTORS 1/2 W ±5%
UNLESS OTHERWISE SPECIFIED
RESISTOR VALUES IN OHMS
METALLIC TRIGGER WHEEL,
ONE TOOTH PER CYLINDER
FIGURE 6. TYPICAL IGNITION SYSTEM USING THE CA3165E
Application Information
Figure 5 and Figure 6 show the application of the CA3165 in
a typical ignition system. The oscillator on the chip operates
at about 400kHz as determined by the tuned circuit L1, C2.
The amplitude of the oscillation is detected on the chip and
applied to a Schmitt trigger which sets the terminal voltage
as shown in the chart in Figure 1 and Figure 2 for the
unloaded condition of the oscillator. As a metallic tooth in the
rotor passes the coil L1, eddy-current losses occur which
reduce the Q of the resonant circuit and decrease the amplitude of the oscillations to a level below that of a reference in
the detector circuit. The output terminals are then switched
to states as shown in the chart in Figure 1 and Figure 2 for
the loaded condition of the oscillator. The oscillation is maintained at this lower amplitude by switching in additional feedback in the oscillator circuit. The fact that the oscillator
continues to operate at some minimum level during this
dwell period eliminates timing variations which would occur if
the oscillator had to be restarted by random noise.
Spark occurs as terminal 4 is switched from high to low. The
output amplifier clamps terminal 4 low through the regulator
during the duration of the spark.
For typical F-Tooth Rotor with Rod Sensor and 113µH of coil
inductance, the Q and frequency with respect to rotor position was measured for the following positions
CENTER 46 at 377kHz
SLOT
6 at 390kHz
FIRE
15 at 381kHz
(Free air Q = 55.7 at 375kHz.)
OSCILLATOR
OSC
LOADED
DWELL
PERIOD
HIGH
DETECTOR
TERM 10
LOW
The Dwell period represents the time that terminal 10
(CA3165E1) or terminal 6 (CA3165E) is high, terminal 4 is
low, and the coil is charged.
The value of the oscillator feedback, resistor, RF , is selected
to set the dwell period. With a sintered-iron 8 f-tooth rotor, a
typical value of RF is 6500Ω for 28.5 degrees of dwell out of
a 45 degree cycle. For a star-type rotor and a particular coil
in a typical distributor, the feedback resistor would be larger
(typically 8800Ω) depending on clearances, coil geometry
and tooth shape.
10-30
HIGH
TERM 4
LOW
DWELL
DWELL
COIL
CHARGE
SPARK
FIGURE 7. TIMING SEQUENCE
OSC
UNLOADED
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