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LTC1842 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1842 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1841/LTC1842/LTC1843 APPLICATIONS INFORMATION 1. Choose the required hysteresis voltage band and calculate values for R4 and R5 according to the formu- las in the hysteresis section. In this example, ±5mV of hysteresis has been added at the comparator input (VH = VHB/2). Note that the hysteresis apparent at VIN will be larger because of the input resistor divider. 2. Select R1. The leakage current into IN B – is under 1nA so the current through R1 should exceed 100nA, to ensure threshold accuracy. R1 values up to about 10M can be used, but values in the 100k to 1M range are usually easier to deal with. In this example choose R1 = 294k. 3. Calculate R2 + R3. The overvoltage threshold should be set at 5.5V. The design equation is as follows: RR R V VV k M UTH REF H 23 1 1 294 55 1 182 0 005 1 1 068 += + = + = – . .. – . 4. Calculate R2. The undervoltage threshold should be set at 4.5V. The design equation is as follows: RR R R VV V R kM k k REF H LTH 21 2 3 1 294 1 068 1 182 0 005 45 294 62 2 =+ + () =+ () = – – . .– . . – . Choose R2 = 61.9k (1% standard value) 5. Calculate R3: R3 = (R2 + R3) – R2 = 1.068M – 61.9k = 1.006M Choose R3 = 1M (1% standard value) 6. Verify the resistor values. The equations are as follows, evaluated for the above example: Overvoltage threshold: VV V RR R R V OTH REF H =+ () ++ = 12 3 1 5 474 . Undervoltage threshold: VV V RR R RR V UTH REF H = () ++ + = – . 12 3 12 4 484 where the hysteresis voltage VV R R H REF = () 5 4 |
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