HA17301P Datasheet, PDF (9/14 Pages) Hitachi Semiconductor – Quad Operational Amplifier

HA17301P
V_IN > R₁ V_BE
11
+
R₁ R₄
− ^V+
R₄
(6)
If resistor R₄ is chosen so that formula 6 holds, and
V_REF > R₂ V_BE
1+ 1
R₂ R₃
− ^V+
R₃
(7)
if resistor R₄ is chosen so that formula 7 holds, then even if V_IN and V_REF are negative, Vout will be V_OH
when I^– < I⁺ and V_OL when I^– > I⁺, as was the case for the positive input voltage comparator.
28
24
V⁺ = +28 V
20
+20
16
+15
12
8
+10
V_REF = −1 V
4
+5
+3
0_{−6 −5}
−4
−3
−2 −1
0
Input volatge Vin (V)
Figure 11 Negative Input Voltage Comparator Operating Characteristics (1)
24
20
V^− = +15 V
16
12
8
4
0
−6
−5
−4
−3
−2
−1
0
Input voltage Vin (V)
Figure 12 Negative Input Voltage Comparator Operating Characteristics (2)
9