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HA17339AF Datasheet(PDF) 11 Page - Renesas Technology Corp

Part # HA17339AF
Description  Quadruple Comparators
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HA17339AF Datasheet(HTML) 11 Page - Renesas Technology Corp

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HA17339A Series
Rev.3.00 Mar 10, 2006 page 11 of 14
4. Basic Comparator
The circuit shown in figure 6 is a basic comparator. When the input voltage VIN exceeds the reference voltage VREF,
the output goes to the high level.
+
VCC
3k
Vin
VREF
HA17339A
Figure 6 Basic Comparator
5. Noninverting Comparator (with Hysteresis)
Assuming +VIN is 0V, when VREF is applied to the inverting input, the output will go to the low level (approximately
0V). 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 = 15V and +VREF = 6V, the following formula can be
derived, i.e. +VIN
× 10M/(5.1M + 10M) > 6V, and Vout will invert from low to high when +V
IN is > 9.06V.
(Vout
− V
IN) ×
(Assuming Vout = 15V)
+ VIN < 6V
R1
R1 + R2
When +VIN is lowered, the output will invert from high to low when +VIN
< 1.41V. Therefore this circuit has a
hysteresis of 7.65V. Figure 8 shows the input characteristics.
+
Vout
3k
10M
R1
R2
5.1M
VCC
VCC
+VREF
+Vin
HA17339A
Figure 7 Noninverting Comparator
0
5
10
15
20
16
12
8
4
0
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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