MC34167, MC33167
http://onsemi.com
4
Figure 2. Voltage Feedback Input Threshold
versus Temperature
Figure 3. Voltage Feedback Input Bias
Current versus Temperature
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 5. Error Amp Output Saturation
versus Sink Current
Figure 6. Oscillator Frequency Change
versus Temperature
Figure 7. Switch Output Duty Cycle
versus Compensation Voltage
−20
A
VOL
, OPEN LOOP VOLTAGE GAIN (dB)
10 M10
f, FREQUENCY (Hz)
0
30
60
90
120
150
180
100 1.0 k 10 k 100 k 1.0 M
0
20
40
60
80
100
, EXCESS PHASE (DEGREES)
φ
Gain
Phase
−12
−55
T
A
, AMBIENT TEMPERATURE (°C)
−25 0 25 50 75 100 125
−8.0
−4.0
0
4.0
V
CC
= 12 V
, OSCILLATOR FREQUENCY CHANGE (%)
OSC
fΔ
4.85
V
FB(th)
, VOLTAGE FEEDBACK INPUT THRESHOLD (V
T
A
, AMBIENT TEMPERATURE (°C)
4.93
5.01
5.09
5.17
5.25
−55 −25 0 25 50 75 100 125
V
CC
= 12 V
0
I
IB
, INPUT BIAS CURRENT (nA)
T
A
, AMBIENT TEMPERATURE (°C)
20
40
60
80
100
−55 −25 0 25 50 75 100 125
V
sat
, OUTPUT SATURATION VOLTAGE (V)
2.00
I
Sink
, OUTPUT SINK CURRENT (mA)
0.4 0.8 1.2 1.6
0
0.4
0.8
1.2
1.6
2.0
V
CC
= 12 V
V
FB
= 5.5 V
T
A
= +25°C
DC, SWITCH OUTPUT DUTY CYCLE (%)
1.5
V
Comp
, COMPENSATION VOLTAGE (V)
2.0 2.5 3.0 3.5 4.0
0
20
40
60
80
100
V
CC
= 12 V
T
A
= +25°C
4.5
V
CC
= 12 V
V
Comp
= 3.25 V
R
L
= 100 k
T
A
= +25°C
V
FB(th)
Max = 5.15 V
V
FB(th)
Min = 4.95 V
V
FB(th)
Typ = 5.05 V
V
CC
= 12 V
V
FB
= V
FB(th)
