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LTC1445IDHD Datasheet(PDF) 10 Page - Linear Technology |
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LTC1445IDHD Datasheet(HTML) 10 Page - Linear Technology |
10 / 14 page LTC1443/LTC1444/LTC1445 10 144345fe applicaTions inForMaTion Level Detector The LTC1444 is ideal for use as a multisupply micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from V1 to the non- inverting comparator A input. R6 and R7 are used to divide down V2, while R8 is the output pull-up resistor for the comparator outputs. R3 and R4 set the hysteresis voltage and R5 and C1 bypass the reference output. IN A+ 5 OUT B OUT A V+ R3 15k, 1% R5 430 5% R4 2.4M 1% C1 1.0µF IN A– HYST REF 4 14 8 IN B+ 7 IN B– 6 – + 144345 F05 1/2LTC1444 3 9 2 1 R1 1.21M 1% R2 3.40M 1% V1 R7 1.21M 1% R6 1.82M 1% V2 R8 2M 1% 5V – + V– 1.2V +– Figure 5. Glitch-Free Level Detector with Hysteresis The following design procedure can be used to select the component values: 1. Choose the V1 voltage trip level, in this example 4.65V. 2. Calculate the required resistive divider ratio. Ratio = VREF/VIN Ratio = 1.221V/4.65V = 0.263 3. Choosetherequiredhysteresisvoltagebandattheinput, VHBIN, in this example 60mV. Calculate the hysteresis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) VHB = (60mV)(0.263) VHB = 15.78mV 4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(kΩ) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point. R1 = VREF/IBIAS = 1.221V/1µA ≈ 1.21M R2 = R1 ( ) VIN VREF + VHB 2 − 1 R2 = 1.21M ( ) 4.65V 1.221V + 15mV 2 − 1 R2 = 3.40M Using the same equations, R6 and R7 are 1.82M and 1.21M, respectively, to set the trip level at 3V for V2. |
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