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TC621HCPA Datasheet(PDF) 7 Page - Microchip Technology |
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TC621HCPA Datasheet(HTML) 7 Page - Microchip Technology |
7 / 20 page 2001-2015 Microchip Technology Inc. DS20001439E-page 7 TC620/TC621 4.0 TYPICAL APPLICATIONS 4.1 Dual Speed Temperature Control In Figure 4-1, the Dual Speed Temperature Control uses a TC620 and a TC4469 quad driver. Two of the drivers of the TC4469 are configured in a simple oscil- lator. When the temperature is below the LOW TEMP set point, the output of the driver is OFF. When the tem- perature exceeds the LOW TEMP set point, the TC4469 gates the oscillator signal to the outputs of the driver. This square wave signal modulates the remain- ing outputs and drives the motor at a low speed. If this speed cannot keep the temperature below the HIGH TEMP set point, then the driver turns on continuously which increases the fan speed to high. The TC620 will monitor the temperature and only allow the fan to oper- ate when needed and at the required speed to maintain the desired temperature. A higher power option can be designed by adding a resistor and a power MOSFET. 4.2 Temperature Controlled Fan In the application in Figure 4-2, a high and a low tem- perature is selected by two RL and RH. The TC620 monitors the ambient temperature and turns the FET switch on when the temperature exceeds the HIGH TEMP set point. The fan remains on until the tempera- ture decreases to the LOW TEMP set point. This provides the hysteresis. In this application, the fan turns on only when required. The TC621 uses an external thermistor to monitor the ambient temperature. This adds one part, but allows more flexibility with the location of the temperature sensor. FIGURE 4-1: Dual Speed Temperature Control. FIGURE 4-2: Temperature Controlled Fan. TC620 2 3 1 5 6 7 +12V VMOTOR MOSFET Fan Motor 50 Ω Higher Power Option 1N4148 1N4148 8 4 TC4469 2 1 3 5 8 13 4 6 9 10 11 12 14 1M 10k 100k High Limit Low Limit Fan Motor 50 pF Temperature Scale 7 Low Temp. 30 C ˚ High Temp. 50 C ˚ 10 µF 0.1 µF – 30 C (Fan Off) – 50 C (Fan Low) – UP (Fan High) ˚ ˚ 1 µF 0 C 30 C 50 C ˚ ˚ ˚ TC620 High Temp. 1 2 3 4 8 7 6 5 Low Temp. +12V MTP3055E Fan Motor TC621 High Temp. 1 2 3 4 8 7 6 5 Low Temp. +12V MTP3055E Fan Motor Thermistor (NTC) RL RL RH RH |
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