MC34067, MC33067
500
400
300
200
3500
C
= 300 pF
V
= 12 V
= 25°C
= 18.2 k
OSC
OSC
CC
T
A
C
= 200 pF
3000
2500
2000
1500
1000
500
OSC
R
C
= 500 pF
OSC
C
= 300 pF
OSC
V
R
= 12 V
= ∞
CC
VFO
R = ∞
T
C
T
= 500 pF
= 25°C
T
100
0
A
Oscillator Discharge Time is Measured at the Drive Outputs.
0
0
20
40
60
80
100
0
400
I , OSCILLATOR CONTROL CURRENT (mA)
OSC
800
1200
1600
2000
t
, OSCILLATOR DISCHARGE TIME (ms)
dischg
Figure 2. Oscillator Timing Resistor
versus Discharge Time
Figure 3. Oscillator Frequency versus
Oscillator Control Current
0.35
0.30
0.25
0.20
0.15
60
V
= 12 V
CC
C
R
T
= 500 pF
= 100 k
OSC
OSC
C
= 200 pF
T
30
20
= 25°C
A
C
= 300 pF
C = 500 pF
T
T
10
6.0
0.10
0.05
One−Shot Period is Measured
at the Drive Outputs.
3.0
0.1
0
0.5
1.0
1.5
2.0
2.5
3.0
0.3
0.6
1.0
3.0
6.0
10
I , OSCILLATOR CONTROL CURRENT (mA)
OSC
t , ONE−SHOT PERIOD (ms)
OS
Figure 4. Error Amp Output Low State Voltage
versus Oscillator Control Current
Figure 5. One−Shot Timing Resistor
versus Period
50
50
60
70
80
90
V
V
= 12 V
= 2.0 V
*V = 5.0 V
ref
CC
0
−ꢀ10
40
30
20
10
0
O
Gain
R = 100 k
L
T
A
= 25°C
−ꢀ20
*V = 5.1 V
ref
V
= 12 V
CC
R = ∞
ref at
L
*V
−ꢀ30
−ꢀ40
−ꢀ50
T
A
= 25°C
Phase
100
110
120
Phase
Margin
= 64°
−10
*V = 5.2 V
ref
−ꢀ20
10 k
100 k
1.0M
10M
−ꢀ55
−ꢀ25
0
25
50
75
100
125
f, FREQUENCY (Hz)
T , AMBIENT TEMPERATURE (°C)
A
Figure 6. Open Loop Voltage Gain and Phase
versus Frequency
Figure 7. Reference Output Voltage Change
versus Temperature
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