HA17339F Hitachi Semiconductor (acquired by Renesas), HA17339F Datasheet - Page 12

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

HA17901, HA17339 Series
4. Basic Comparator
5. Noninverting Comparator (with Hysteresis)
12
The circuit shown in figure 6 is a basic comparator. When the input voltage V
voltage V
Assuming +V
(approximately 0V). If the voltage applied to +V
the value of the noninverting input, +V
lowered, Vout will be inverted to the low level once again when the value of the noninverting input,
(Vout – V
assuming V
10M)
When +V
circuit has a hysteresis of 7.65V. Figure 8 shows the input characteristics.
+V
Frequency
control
voltage
input
V
+250mV
700Hz
CC
C
= 30V
(Vout – V
(Assuming Vout = 15V)
6V, and Vout will invert from low to high when +V
/
REF
+V
IN
100k
IN
100kHz
CC
)
C
, the output goes to the high level.
is lowered, the output will invert from high to low when +V
IN
= 15V and +V
+50V
R
is 0V, when V
IN
50k
1
/(R
)
20k
1
R
0.1
+ R
1
R
+ R
1
2
), becomes lower than V
10
20k
2
Figure 5 Voltage Controlled Oscillator
REF
+ V
REF
V
= 6V, the following formula can be derived, i.e. +V
REF
Vin
IN
–
+
HA17901
Figure 6 Basic Comparator
is applied to the inverting input, the output will go to the low level
V
A
HA17901
CC
3
6V
V
A
CC
IN
1
500p
–
+
+
–
R
2
/(R
0.01
IN
V
1
is gradually increased, the output will go high when
CC
3k
+ R
REF
V
/2
CC
. With the circuit constants shown in figure 7,
2
), exceeds +V
V
5.1k
CC
IN
V
/2
is > 9.06V.
CC
3k
+
–
HA17901
V
REF
100k
CC
. Next, if +V
A
IN
2
IN
1.41V. Therefore this
exceeds the reference
3k
V
IN
CC
IN
10M/(5.1M +
is gradually
Output 1
Output 2