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REV.-A
v
0,
I
I
1
V
+ - '
- - j
Et)
terminal
8
terminal
PWM Comparator
Output
OL.--
-'--~
_I___ _ _l__
_l__ _
Figure 2-20. PWM Output
This circuit does not perform dead time control.
2.3.7 Voltage Limiting Circuit
Figure 2-21 shows the Voltage Limiting Circuit.
In this circuit, switching transistor Q 1 will go off if the voltages on the
+
24V line reaches about
+
30V,
or if the voltage on the
+
5V line reaches about
+
6V. Zener diode Z022 is used to detect abnormal
voltage on the
+
24V line; Zener diode Z021 is used on the
+
5V line.
05
+24VOC
line
_ ....
~+5VOC
line
021
6V
7 1--------;-,2
1-,-
'"--4__......._
PC 1
1.
1
8
(120V Ver)
Figure 2-21. Voltage Limiting Circuit
2-22
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