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TC642EOA Datasheet(PDF) 9 Page - Microchip Technology |
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TC642EOA Datasheet(HTML) 9 Page - Microchip Technology |
9 / 28 page 2002 Microchip Technology Inc. DS21444C-page 9 TC642 5.0 TYPICAL APPLICATIONS Designing with the TC642 involves the following: (1) The temp sensor network must be configured to deliver 1.25V to 2.65V on VIN for 0% to 100% of the temperature range to be regulated. (2) The minimum fan speed (VMIN) must be set. (3) The output drive transistor and associated circuitry must be selected. (4) The SENSE network, RSENSE and CSENSE, must be designed for maximum efficiency, while delivering adequate signal amplitude. (5) If shutdown capability is desired, the drive require- ments of the external signal or circuit must be considered. The TC642 demonstration and prototyping board (TC642DEMO), and the TC642 Evaluation Kit (TC642EV), provide working examples of TC642 cir- cuits and prototyping aids. The TC642DEMO is a printed circuit board optimized for small size and ease of inclusion into system prototypes. The TC642EV is a larger board intended for benchtop development and analysis. At the very least, anyone contemplating a design using the TC642 should consult the documen- tation for both TC642EV (DS21403) and TC642DEMO (DS21401). FIGURE 5-1: Typical Application Circuit. 5.1 Temperature Sensor Design The temperature signal connected to VIN must output a voltage in the range of 1.25V to 2.65V (typical) for 0% to 100% of the temperature range of interest. The circuit in Figure 5-2 illustrates a convenient way to provide this signal. Figure 5-2 shows a simple temperature dependent voltage divider circuit. RT1 is a conventional NTC ther- mistor while R1 and R2 are standard resistors. The sup- ply voltage, VDD, is divided between R2 and the parallel combination of RT1 and R1 (for convenience, the paral- lel combination of RT1 and R1 will be referred to as RTEMP). The resistance of the thermistor at various temperatures is obtained from the manufacturer’s specifications. Thermistors are often referred to in terms of their resistance at 25°C. FAULT SENSE NTC R1 R2 R3 R4 GND Thermal Shutdown Shutdown (Optional) Note: *See cautions regarding latch-up considerations in Section 5.0, "Typical Applications". Q1 +12V +5V* VDD VIN VMIN VOUT RBASE RSENSE CSENSE CF 1 µF CF TC642 Fan CB 1 µF CB 0.01 µF CB 0.01 µF 1 8 6 7 5 4 2 3 |
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