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MC34063 Datasheet(Fiches technique) 4 Page - ON Semiconductor

Numéro de pièce MC34063
Description  DC-to-DC Converter Control Circuits
Télécharger  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
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MC34063A, MC33063A
http://onsemi.com
4
ton
VCC = 5.0 V
Pin 7 = VCC
Pin 5 = Gnd
TA = 25°C
toff
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor
Figure 2. Timing Capacitor Waveform
0.01 0.02
0.05 0.1
0.2
0.5 1.0
2.0
5.0 10
CT, OSCILLATOR TIMING CAPACITOR (nF)
10 µs/DIV
VCC = 5.0 V
Pin 7 = VCC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
CT = 1.0 nF
TA = 25°C
1000
500
200
100
50
20
10
5.0
2.0
1.0
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
Figure 5. Current Limit Sense Voltage
versus Temperature
Figure 6. Standby Supply Current versus
Supply Voltage
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
IE, EMITTER CURRENT (A)
VCC = 5.0 V
Pins 1, 7, 8 = VCC
Pins 3, 5 = Gnd
TA = 25°C
(See Note 6.)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
IC, COLLECTOR CURRENT(A)
Darlington Connection
Forced β = 20
-55
-25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
VCC = 5.0 V
Ichg = Idischg
0
5.0
10
15
20
25
30
35
40
VCC, SUPPLY VOLTAGE (V)
CT = 1.0 nF
Pin 7 = VCC
Pin 2 = Gnd
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
400
380
360
340
320
300
280
260
240
220
200
3.6
3.2
2.4
2.0
1.6
1.2
0.8
0.4
0
1.0
2.8
VCC = 5.0 V
Pin 7 = VCC
Pins 2, 3, 5 = Gnd
TA = 25°C
(See Note 6.)
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.




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