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HA17339AF Datasheet(PDF) 11 Page - Renesas Technology Corp |
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HA17339AF Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 15 page 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 Ω 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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