HA17901A_15 Datasheet, PDF (15/18 Pages) Renesas Technology Corp – Quadruple Comparators

HA17901A 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 = 15 V
and Vout = 15 V, this circuit will have a 5 V hysteresis. Figure 10 shows the I/O characteristics for the circuit in
figure 9.
+Vin
1M
V_CC
V_CC
−
HA17901A
+
V_CC
3k
Vout
1M ^1M
Figure 9 Inverting Comparator
20
16
V_CC = 15 V
12
8
4
0
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 100
kΩ and 10 kΩ resistors. When V_IN is 0 V 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
100 k
Vin
5.1 k 5.1 k
1S2076
100 k _VCC
−
HA17339A
+
10 k ^{20 M}
5.1 k
Vout
Figure 11 Zero-Cross Detector
Rev.1.00 Mar 10, 2006 page 13 of 15