HA17901AFP datasheet(13/16 Pages) RENESAS

13 / 16 page

HA17901A Series

Rev.1.00 Mar 10, 2006 page 13 of 15

6. Inverting Comparator (with Hysteresis)

In this circuit, the output Vout inverts from high to low when +VIN > (VCC + Vout)/3. Similarly, the output Vout

inverts from low to high when +VIN < VCC/3. With the circuit constants shown in figure 9, assuming VCC = 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.

−

VCC

Vout

3 k

VCC

+Vin

1 M

HA17901A

Figure 9 Inverting Comparator

Input Voltage VIN (V)

VCC = 15 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 VCC with 100

Ω and 10 kΩ resistors. When V

IN is 0 V or higher, the output will be low, and when VIN is negative, Vout will

invert to the high level. (See figure 11.)

−

VCC

Vout

Vin

VCC

5.1 k

100 k

1S2076

10 k 20 M

HA17339A

Figure 11 Zero-Cross Detector

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