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TC07VUA Scheda tecnica(PDF) 4 Page - Microchip Technology |
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TC07VUA Scheda tecnica(HTML) 4 Page - Microchip Technology |
4 / 12 page TC07 DS21674C-page 4 © 2005 Microchip Technology Inc. 4.0 TYPICAL APPLICATIONS 4.1 Trip Point Programming The resistor values required to achieve the desired trip point temperatures on TSET and HSET are calculated using the formula below: For example, to program the TC07 outputs to go active at 50°C and inactive at 30°C, the RT and RH programming resistors are calculated as follows: Resistance values for TSET and HSET can be approxi- mated using Figure 4-1. Care must be taken to ensure the HSET programming resistor is a smaller value than the TSET programming resistor. The temperature programmed on HSET must be at least 5°C lower than the temperature value programmed by TSET. FIGURE 4-1: PROGRAMMING RESISTOR VALUES VS. TEMPERATURE 4.2 Cooling and Heating Applications The TC07 can be used to control a DC fan as shown in Figure 4-2. The fan turns on when the sensed temper- ature rises above the temperature set at TSET and remains on until the temperature falls below the tem- perature set at HSET. The amount of “cooling" performed by the fan is dependent on the programmed hysteresis. Figure 4-3 shows the TC07 acting as a heater thermo- stat. Circuit operation is identical to that of the cooling fan application in Figure 4-2. FIGURE 4-2: TC07 AS A FAN CONTROLLER RTRIP = 0.6 x T 2.13 Where: RTRIP = Programming resistor value in Ohms T = Desired trip point temperature in degrees Kelvin. RT = 0.6 x ((50 + 273.15) 2.13) = 132.8kΩ RH = 0.6 x ((30 + 273.15) 2.13) = 115.9kΩ TEMPERATURE ( °C) -55 -35 -15 5 25 45 65 85 105 125 50 100 150 200 250 Out Fan "On" HSET TSET NC RT RH +2.7 to 5.5V +12V TSET HSET GND VDD OUT NC Logic Level MOSFET TC07 OUT + Fan |
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