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LTC1040 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1040 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1040 1040fa TYPICAL APPLICATIO S Complete Heating/Cooling Automatic Thermostat 5k TEMP ADJUST 6.81k 4.32k 4.99k 82k* 20M 82k* SEPARATION (20mV) LTC1040 • TA03 – – + + COMP B LTC1040 – – + + COMP A 5 17 18 4 3 15 16 10 0.1 µF 10M COOL HEAT 9 6 7 8 14 13 12 11 20M THERMISTOR # 44007 YELLOW SPRINGS INSTRUMENT CO., INC. HYSTERESIS = 5V • = 20mV 5V AT 0.85 µA † † * 82k 20M 28 °C 27 °C HEAT COOL TIME LTC1040 • TA04 HEATER ON HEATER OFF AIRCONDITIONING OFF AIRCONDITIONING ON HYSTERESIS HYSTERESIS SEPARATION Window Comparator with Independent Window Limits and Fully Floating Differential Input Hysteresis Comparator with Fully Floating Differential Input AOUT = “1” WHEN VIN > VU BOUT = “1” WHEN VIN < VL A+B = “1” WHEN VU ≥ VIN ≥ VL LTC1040 • TA05 – – + + – – + + COMP A COMP B LTC1040 VL VIN VU VIN OUT = “0” WHEN VIN > VU = = 0.996 VTRIP + 20mV VTRIP LTC1040 • TA06 V+ R2 2.49M Ω R1 10k OUT – – + + 1/2 LTC1040 * * VTRIP R2 + (5V) R1 R1 + R2 OUT = “1” WHEN VIN < V1 = TO CENTER HYSTERESIS ABOUT VTRIP, FORCE THIS INPUT TO HYSTERESIS/2 (10mV) = 0.996VTRIP VTRIP R2 R1 + R2 |
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