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MC34163_05 Datasheet(PDF) 4 Page - ON Semiconductor

Part No. MC34163_05
Description  3.4 A, Step−Up/Down/Inverting Switching Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC34163, MC33163
http://onsemi.com
4
100
CT, OSCILLATOR TIMING CAPACITOR (nF)
0.1
10
1.0
1.0
10
Figure 2. Output Switch On−Off Time
versus Oscillator Timing Capacitor
Figure 3. Oscillator Frequency Change
versus Temperature
2.0
−55
TA, AMBIENT TEMPERATURE (°C)
0
−2.0
−4.0
−6.0
−25
0
25
50
75
100
125
1
2
3
4
5
VCC = 15 V
CT = 620 pF
VCC = 15 V
TA = 25°C
1)ton, RDT = ∞
2)ton, RDT = 20 k
3)ton, toff, RDT = 10 k
4)toff, RDT = 20 k
5)toff, RDT = ∞
Figure 4. Feedback Comparator 1 Input Bias
Current versus Temperature
2.8
2.4
2.0
1.6
1.2
−55
−25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
VCC = 15 V
Pin 16 = VCC + 5.0 V
Figure 5. Feedback Comparator 2 Threshold
Voltage versus Temperature
7.6
7.4
7.2
7.0
6.8
−55
−25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
IZ = 25 mA
Figure 6. Bootstrap Input Current
Source versus Temperature
Figure 7. Bootstrap Input Zener Clamp
Voltage versus Temperature
140
−55
TA, AMBIENT TEMPERATURE (°C)
120
100
80
60
−25
0
25
50
75
100
125
1300
1280
1260
1240
1220
1200
−55
TA, AMBIENT TEMPERATURE (°C)
−25
0
25
50
75
100
125
Vth Typ = 1250 mV
Vth Min = 1225 mV
VCC = 15 V
VFB1 = 5.05 V
Vth Max = 1275 mV
VCC = 15 V




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