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LT6700HVHS6-2-TRMPBF Datasheet(PDF) 16 Page - Linear Technology |
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LT6700HVHS6-2-TRMPBF Datasheet(HTML) 16 Page - Linear Technology |
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16 / 20 page  LT6700-1/LT6700-2/LT6700-3/ LT6700HV-1/LT6700HV-2/ LT6700HV-3 16 6700123ff APPLICATIONS INFORMATION Figure 2. Micropower Thermostat/Temperature Alarm LT6700-1 VS 10k GND +INA –INB OUTB OUTA 499k RTH T RTH = 1M (e.g., YSI 44015, 1.00MΩ AT 25°C) RSET = RTH AT TSET *RESISTANCE MAY REQUIRE OPTIMIZATION FOR OPERATION OVER INTENDED RTH AND VSUPPLY RANGES HYSTERESIS ZONE ≈0.4°C RSET 2 • VREF 499k 220k 220k* 3.3μF 3.3μF 1.4V TO 18V (IS ≈ 10μA) 0.1μF T < TSET 6700123 F02 ing into spec” condition, as with the examples in Figure 1), the nominal resistor values are selected as follows: R1 ≤ 400k (this sets the divider current >> IB of inputs) R2 = R1 • (1.02 • VH/VL – 1) R3 = R1 • (2.54 • VH – 1.02 • VH/VL) The worst-case variance of the trip-points is related to the specified threshold limits of the LT6700/LT6700HV device and the basic tolerance of divider resistors used. For resistor tolerance RTOL (e.g. 0.01 for 1%), the worst- case trip-point voltage (either VH or VL) deviations can be predicted as follows (italicized values are taken from the datasheet, expressed in volts): Max dev VTRIP↑ = ±VTRIPnom • {2 • RTOL • [(VTRIPnom – 0.4) / VTRIPnom] + 1.25 • (VTH(R)max – VTH(R)min)} Max dev VTRIP↓ = ±VTRIPnom • {2 • RTOL • [(VTRIPnom – 0.39) / VTRIPnom] + 1.27 • (VTH(F)max – VTH(F)min)} Generating an External Reference Signal In some applications, it would be advantageous to have access to a signal that is directly related to the internal 400mV reference, even though the reference itself is not available externally. This can be accomplished to a reason- able degree by using an inverting comparator section as a “bang-bang” servo, establishing a nominal voltage, on an integration capacitor, that is scaled to the reference. This method is used in Figure 2, where the reference level has been doubled to drive a resistor bridge. The section B output cycles on and off to swing the section B input between its hysteresis trip points as the load capacitor charges and discharges in a shallow, controlled fashion. The multiplied reference signal also contains ripple that is the hysteresis multiplied by the same factor, so additional filtering is performed at the sense node of the bridge to prevent comparator chatter in the section A comparator, which is performing the actual conditional decision for the circuit. |
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