HA17901 データシートの表示（PDF） - Renesas Electronics

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HA17901

Quadruple Comparators

Renesas Electronics 

HA17901 Series

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 = 15V and

Vout = 15V, this circuit will have a 5V hysteresis. Figure 10 shows the I/O characteristics for the circuit in figure 9.

+Vin

1M

VCC

VCC

−

HA17901

+

VCC

3k

Vout

1M 1M

Figure 9 Inverting Comparator

20

16

VCC = 15 V

12

8

4

0

0

5

10

15

Input Voltage VIN (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 100kΩ

and 10kΩ resistors. When VIN is 0V or higher, the output will be low, and when VIN is negative, Vout will invert to

the high level. (See figure 11.)

VCC

100k

Vin

5.1k

5.1k

1S2076

100k VCC

−

HA17901

+

10k 20M

5.1k

Vout

Figure 11 Zero-Cross Detector

Rev.1.00 Jun 15, 2005 page 11 of 12

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