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MCP6549 数据表(PDF) 13 Page - Microchip Technology |
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MCP6549 数据表(HTML) 13 Page - Microchip Technology |
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13 / 28 page  2003 Microchip Technology Inc. DS21714C-page 13 MCP6546/7/8/9 3.4.1 INVERTING CIRCUIT Figure 3-3 shows an inverting circuit for a single-supply application using three resistors, besides the pull-up resistor. The resulting hysteresis diagram is shown in Figure 3-4. FIGURE 3-3: Inverting circuit with hysteresis. FIGURE 3-4: Hysteresis diagram for the inverting circuit. In order to determine the trip voltages (VTHL and VTLH) for the circuit shown in Figure 3-3, R2 and R3 can be simplified to the Thevenin equivalent circuit with respect to VDD, as shown in Figure 3-5. FIGURE 3-5: Thevenin Equivalent Circuit. Where: Using this simplified circuit, the trip voltage can be calculated using the following equation: EQUATION Figure 2-19 and Figure 2-22 can be used to determine typical values for VOL. This voltage is dependent on the output current IOL as shown in Figure 3-3. This current can be determined using the equation below: EQUATION VOH can be calculated using the equation below: EQUATION As explained in Section 3.1, “Comparator Inputs”, it is important to keep the non-inverting input below VDD+0.3V when VPU > VDD. 3.5 Supply Bypass With this family of comparators, the power supply pin (VDD for single supply) should have a local bypass capacitor (i.e., 0.01 µF to 0.1 µF) within 2 mm for good edge rate performance. 3.6 Capacitive Loads Reasonable capacitive loads (e.g., logic gates) have little impact on propagation delay (see Figure 2-27). The supply current increases with increasing toggle frequency (Figure 2-30), especially with higher capacitive loads. VIN VOUT MCP654X VDD R2 RF R3 VPU RPU VDD IOL IRF IPU VOUT High-to-Low Low-to-High VOH VOL VSS VSS VDD VTLH VTHL VIN VPU VTLH = trip voltage from low to high VTHL = trip voltage from high to low V23 VOUT MCP654X VPU R23 RF + - RPU R23 R2R3 R2 R3 + ------------------ = V23 R3 R2 R3 + ------------------ VDD × = VTHL VPU R23 R23 RF RPU ++ ---------------------------------------- V23 RF RPU + R23 RF RPU ++ --------------------------------------- + = VTLH VOL R23 R23 RF + ----------------------- V23 RF R23 RF + ---------------------- + = VTLH = trip voltage from low to high VTHL = trip voltage from high to low IOL IPU IRF + = IOL VPU VOL – RPU -------------------------- V23 VOL – R23 RF + ------------------------ + = VOH VPU V23 – () R23 RF + R23 RF RPU ++ -------------------------------------- × = |
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