HA17901AFP datasheet(12/16 Pages) RENESAS

номер детали	HA17901AFP

подробное описание детали	Quadruple Comparators

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производитель	RENESAS [Renesas Technology Corp]

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12 / 16 page

HA17901A Series

Rev.1.00 Mar 10, 2006 page 12 of 15

5. Noninverting Comparator (with Hysteresis)

Assuming +VIN is 0 V, when VREF is applied to the inverting input, the output will go to the low level

(approximately 0 V). If the voltage applied to +VIN is gradually increased, the output will go high when the value of

the noninverting input, +VIN

× R

2/(R1 + R2), exceeds +VREF.

Next, if +VIN is gradually lowered, Vout will be

inverted to the low level once again when the value of the noninverting input, (Vout – VIN)

× R

1/(R1 + R2), becomes

lower than VREF. With the circuit constants shown in figure 7, assuming VCC = 15 V and +VREF = 6 V, the following

formula can be derived, i.e. +VIN

× 10 M/(5.1 M + 10 M) > 6 V, and Vout will invert from low to high when +V

IN is

> 9.06 V.

(Vout

− VIN) ×

(Assuming Vout = 15V)

+ VIN < 6V

R1 + R2

When +VIN is lowered, the output will invert from high to low when +VIN

< 1.41 V. Therefore this circuit has a

hysteresis of 7.65 V. Figure 8 shows the input characteristics.

−

Vout

3 k

10 M

5.1 M

VCC

+VREF

+Vin

HA17901A

Figure 7 Noninverting Comparator

Input Voltage VIN (V)

VCC = 15 V, +VREF = 6 V

+Vin = 0 to 10 V

Figure 8 Noninverting Comparator I/O Transfer Characteristics

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