MC34167 Datasheet, PDF (3/16 Pages) ON Semiconductor – POWER SWITCHING REGULATORS

MC34167 MC33167
Figure 1. Voltage Feedback Input Threshold
versus Temperature
5.25
VCC = 12 V
5.17
VFB(th) Max = 5.15 V
5.09
VFB(th) Typ = 5.05 V
5.01
VFB(th) Min = 4.95 V
4.93
Figure 2. Voltage Feedback Input Bias
Current versus Temperature
100
80
VCC = 12 V
VFB = VFB(th)
60
40
20
4.85
– 55 – 25
0
25 50
75 100 125
TA, AMBIENT TEMPERATURE (°C)
0
– 55 – 25
0
25
50
75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 3. Error Amp Open Loop Gain and
Phase versus Frequency
100
0
VCC = 12 V
80
Gain
VComp = 3.25 V
RL = 100 k
30
TA = +25°C
60
60
40
90
Phase
20
120
0
150
– 20
10
180
100
1.0 k
10 k
100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 4. Error Amp Output Saturation
versus Sink Current
2.0
1.6
1.2
0.8
VCC = 12 V
VFB = 5.5 V
0.4
TA = +25°C
0
0
0.4
0.8
1.2
1.6
2.0
ISink, OUTPUT SINK CURRENT (mA)
Figure 5. Oscillator Frequency Change
versus Temperature
4.0
VCC = 12 V
0
– 4.0
– 8.0
– 12
– 55 – 25
0
25 50
75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 6. Switch Output Duty Cycle
versus Compensation Voltage
100
80
VCC = 12 V
TA = +25°C
60
40
20
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
VComp, COMPENSATION VOLTAGE (V)
MOTOROLA ANALOG IC DEVICE DATA
3