MC34067, MC33067
0
0
Source Saturation
(Load to Ground)
V
= 12 V
80 ms Pulsed Load
CC
V
T
= −ꢀ40°C
CC
A
−1.0
−ꢀ2.0
−ꢀ3.0
−10
120 Hz Rate
T
A
= 25°C
T
A
= −ꢀ20°C
−ꢀ20
T
A
= −ꢀ40°C
T
A
= −125°C
3.0
2.0
1.0
−ꢀ30
−ꢀ40
−ꢀ50
T
A
= −ꢀ40°C
T
= 25°C
A
V
= 12 V
CC
GND
Source Saturation
)
(Load to V
CC
0
0
20
40
60
80
100
0
0.2
0.4
0.6
0.8
1.0
I , REFERENCE SOURCE CURRENT (mA)
ref
I , OUTPUT LOAD CURRENT (A)
O
Figure 8. Reference Output Voltage Change
versus Source Current
Figure 9. Drive Output Saturation Voltage
versus Load Current
3.2
2.4
1.6
0.8
C = 1.0 nF
L
T
= 25 °C
90%
A
V
= 12 V
Pin 10 = V
CC
10%
ref
T
A
= 25 °C
0
0
2.0
4.0
6.0
8.0
10
20 ns/DIV
I
, CAPACITOR DISCHARGE CURRENT (mA)
dchg
Figure 10. Drive Output Waveform
Figure 11. Soft−Start Saturation Voltage
versus Capacitor Discharge Current
24
2000
1600
T
A
= 25 °C
V
= 12 V
C = 1.0 nF
= 25 °C
CC
L
20
16
12
8.0
4.0
0
T
A
Enable/UVLO
Adjust Pin
Open
1200
800
400
0
(Solid Line)
Enable/UVLO
Adjust Pin
to V
CC
(Dashed Line)
30
40
50
60
70
80
90
0
4.0
8.0
V , SUPPLY VOLTAGE (V)
CC
12
16
20
I , SUPPLY CURRENT (mA)
CC
Figure 12. Operating Frequency
versus Supply Current
Figure 13. Supply Current versus Supply Voltage
http://onsemi.com
6
ONSEMI [ ONSEMI ]
