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TS9001-2IJ5 Arkusz danych(PDF) 7 Page - Touchstone Semiconductor Inc |
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TS9001-2IJ5 Arkusz danych(HTML) 7 Page - Touchstone Semiconductor Inc |
7 / 8 page TS9001 TS9001DS r1p0 Page 7 RTFDS 6) The last step is to verify the trip voltages and hysteresis band using the standard resistance values: For VIN rising: VTHR = VREF x R1 [(1/R1) + (1/R2) + (1/R3)] = 3V For VIN falling: VTHF = VTHR - (R1 x VCC/R2) = 2.9V and Hysteresis Band = VTHR – VTHF = 100mV Adding Hysteresis to the TS9001-2 Open-Drain Option The TS9001-2 has open-drain output and requires an external pull-up resistor to VCC as shown in Figure 4. Additional hysteresis can be generated using positive feedback; however, the formulae differ slightly from those of the push-pull option TS9001-1. The procedure to calculate the resistor values for the TS9001-2 is as follows: 1) As in the previous section, resistor R2 is chosen according to the formulae: R2 = VREF/0.2µA or R2 = (VCC - VREF)/0.2μA - R4 where the smaller of the two resulting resistor values is the best starting value. 2) As before, the desired hysteresis band (VHYSB) is set to 100mV. 3) Next, resistor R1 is then computed according to the following equation: R1 = (R2 + R4) x (VHYSB/VCC) 4) The trip point for VIN rising (VTHR) is chosen (again, remember that VTHF is the trip point for VIN falling). This is the threshold voltage at which the comparator switches its output from low to high as VIN rises above the trip point. 5) With the VTHR from Step 4 above, resistor R3 is computed as follows: R3 = 1/[VTHR/(VREF x R1) - (1/R1) - (1/R2)] 6) As before, the last step is to verify the trip voltages and hysteresis band with the standard resistor values used in the circuit: For VIN rising: VTHR = VREF x R1 x (1/R1+1/R2+1/R3) For VIN falling: VTHF = VREF x R1 x (1/R1+1/R3+1/(R2+R4)) -(R1/(R2+R4)) x VCC and Hysteresis Band is given by VTHR - VTHF PC Board Layout and Power-Supply Bypassing While power-supply bypass capacitors are not typically required, it is good engineering practice to use 0.1uF bypass capacitors close to the device’s power supply pins when the power supply impedance is high, the power supply leads are long, or there is excessive noise on the power supply traces. To reduce stray capacitance, it is also good engineering practice to make signal trace lengths as short as possible. Also recommended are a ground plane and surface mount resistors and capacitors. Figure 4 : Using Four Resistors Introduces Additional Hysteresis in the TS9001-2. |
Podobny numer części - TS9001-2IJ5 |
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Podobny opis - TS9001-2IJ5 |
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