HA17339A Series
6. Inverting Comparator (with Hysteresis)
In this circuit, the output Vout inverts from high to low when +V
IN
> (V
CC
+ Vout)/3. Similarly, the output Vout
inverts from low to high when +V
IN
< V
CC
/3. With the circuit constants shown in figure 9, assuming V
CC
= 15V and
Vout = 15V, this circuit will have a 5V hysteresis. Figure 10 shows the I/O characteristics for the circuit in figure 9.
V
CC
+Vin
V
CC
1M
−
HA17339A
V
CC
3k
Vout
+
1M
1M
Figure 9 Inverting Comparator
20
Output Voltage Vout (V)
16
12
8
4
0
V
CC
= 15 V
0
5
10
15
Input Voltage V
IN
(V)
Figure 10 Inverting Comparator I/O Transfer Characteristics
7. Zero-Cross Detector (Single-Voltage Power Supply)
In this circuit, the noninverting input will essentially beheld at the potential determined by dividing V
CC
with 100kΩ
and 10kΩ resistors. When V
IN
is 0V or higher, the output will be low, and when V
IN
is negative, Vout will invert to
the high level. (See figure 11.)
V
CC
100k
5.1k
100k V
CC
−
HA17339A
5.1k
Vout
Vin
5.1k
1S2076
+
10k
20M
Figure 11 Zero-Cross Detector
Rev.3.00 Mar 10, 2006 page 12 of 14
RENESAS [ RENESAS TECHNOLOGY CORP ]
