HA17339F Hitachi Semiconductor (acquired by Renesas), HA17339F Datasheet - Page 11

• Manufacturer Part Number: HA17339F
• Description: Quadruple Comparators
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

2. Pulse Generator
3. Voltage Controlled Oscillator
The charge and discharge circuits in the circuit from figure 1 are separated by diodes in this circuit. (See
figure 3.) This allows the pulse width and the duty cycle to be set independently. Figure 4 shows the
waveforms generated by this circuit.
In the circuit in figure 5, comparator A
hysteresis, and A
the low level, the A
level than the A1 noninverting input. The A1 output will integrate this state and its output will increase
towards the high level. When the output of the integrator A
inverting input, A
level. This causes the integrator to integrate a negative state, resulting in its output decreasing towards
the low level. Then, when the A
input, the output Vout1 is once again inverted to the low level. This operation generates a square wave
on Vout1 and a triangular wave on Vout2.
Horizontal: 2 V/div, Vertical: 20 s/div, V
3
2
operates as the switch that controls the oscillator frequency. If the output Vout1 is at
inverts to the high level and both the output Vout1 and the A
3
output will go to the low level and the A1 inverting input will become a lower
V
CC
Figure 4 Operating Waveforms
1
output level becomes lower than the level on the A
Figure 3 Pulse Generator
80pF
C
1M
CC
1
operates as an integrator, A
= 5 V
R
R
1
2
1M
100k
1M
–
HA17901
+
Horizontal: 5 V/div, Vertical: 20 s/div, V
1M
D
D
V
1
2
CC
IS2076
IS2076
1
V
exceeds the level on the comparator A
CC
HA17901, HA17339 Series
Vout
2
operates as a comparator with
3
output go to the high
CC
= 15 V
2
noninverting
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