MC34063A 查看數據表（PDF） - Wing Shing International Group
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MC34063A Datasheet PDF : 15 Pages
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MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL PERFORMANCE CHARACTERISTICS
1000
500
VCC=5.0V
200
Pin7=VCC
Pin5=GND
100
TA=25°C
50
ton
20
10
5.0
toff
2.0
1.0
0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10
CT,OSCILLATOR TIMING CAPACITOR(nF)
Figure 2. Output Switch On−Off Time vs.
Oscillator Timing Capacitor
1.8
1.7
1.6
1.5
1.4
VCC=5.0V
1.3
Pins1,7,8=Vcc
Pins3,5=GND
TA = 25ºC
1.2
1.1
1.0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IE, EMITTER CURRENT(A)
Figure 4. Emitter Follower Configuration Output
Saturation Voltage vs. Emitter Current
VCC=5.0V Pins1,5,8=Open
Pin7=VCC CT=1.0μF
Pin2=GND TA=25°C
10μS / DIV
Figure 3. Timing Capacitor Waveform
1.1
1.0
0.9
0.8
Darlington Connection
0.7
0.6 VCC=5.0V
0.5
Pin7=Vcc
Pins 2,3,5=GND
0.4 TA = 25ºC
0.3
Forcedβ = 20
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IC, COLLECTOR CURRENT(A)
Figure 5. Common Emitter Configuration Output Switch
Saturation Voltage vs. Collector Current
400
380
Vcc=5.0V
360
Ichg=Idischg
340
320
300
280
260
240
220
200
-55 -25 0 25 50 75 100 125
TA,AMBIENT TEMPERATURE(°C)
Figure 6. Current Limit Sense Voltage vs.
Temperature
3.6
3.2
2.8
2.4
2.0
1.6
1.2
CT=1.0nF
0.8
Pin7=Vcc
Pin2=GND
0.4
0
0 5.0 10 15 20 25 30 35 40
VCC,S UPPLY VOLTAGE(V)
Figure 7. Standby Supply Current vs. Supply Voltage
5
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