
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
18
180
16
14
12
10
8
V CC = 5.0 V, Pin 7 = V CC
Pin 5 = GND, T A = 25 ° C
ON TIME ( m s)
160
140
120
100
80
6
4
2
OFF TIME ( m s)
FREQUENCY (kHz)
60
40
20
V CC = 5.0 V
Pin 7 = V CC
Pin 2 = GND
Pins 1, 5, 8 = Open
C T = 1.0 nF
T A = 25 ° C
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
5.0
10 m s/DIV
1.8
Ct, TIMING CAPACITOR CAPACITANCE (nF)
Figure 3. Oscillator Frequency
1.1
Figure 4. Timing Capacitor Waveform
1.7
1.6
1.5
1.0
0.9
0.8
0.7
Darlington Connection
1.4
1.3
1.2
1.1
V CC = 5.0 V
Pins 1, 7, 8 = V CC
Pins 3, 5 = GND
T A = 25 ° C
0.6
0.5
0.4
0.3
0.2
0.1
V CC = 5.0 V
Pin 7 = V CC
Pins 2, 3, 5 = GND
T A = 25 ° C
Forced b = 20
1.0
0
0
0.2
0.4
0.6 0.8 1.0 1.2
1.4
1.6
0
0.2
0.4
0.6 0.8 1.0 1.2
1.4
1.6
400
380
I E , EMITTER CURRENT (A)
Figure 5. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
3.6
3.2
I C , COLLECTOR CURRENT(A)
Figure 6. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
360
340
320
300
280
V CC = 5.0 V
I chg = I dischg
2.8
2.4
2.0
1.6
260
240
220
1.2
0.8
0.4
C T = 1.0 nF
Pin 7 = V CC
Pin 2 = GND
200
-55
-25
0 25 50 75
100
125
0
0
5.0
10
15 20 25 30
35
40
T A , AMBIENT TEMPERATURE ( ° C)
Figure 7. Current Limit Sense Voltage
versus Temperature
V CC , SUPPLY VOLTAGE (V)
Figure 8. Standby Supply Current versus
Supply Voltage
7. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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