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TC648EPA Folha de dados(PDF) 9 Page - Microchip Technology |
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TC648EPA Folha de dados(HTML) 9 Page - Microchip Technology |
9 / 28 page 2002 Microchip Technology Inc. DS21448C-page 9 TC648 5.0 TYPICAL APPLICATIONS Designing with the TC648 involves the following: (1) The temperature 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 auto-shutdown temperature must be set with a voltage divider on VAS (if used). (3) The output drive transistor and base resistor must be selected. (4) If reset/shutdown capability is desired, the drive requirements 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 TC648 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 TC648 should consult the documen- tation for both the TC642EV (DS21403) and TC642DEMO (DS21401). Figure 5-1 shows the base schematic for the TC642DEMO. An Excel-based spreadsheet is also available for designing the thermistor network for the TC64X fan controllers. This file (TC64X Therm) is available for downloading from the Microchip website at www.microchip.com. FIGURE 5-1: Typical Application Circuit. OTF NC NTC R1 R2 R3 R4 GND *See cautions regarding latch-up considerations in Section 5.0, "Typical Applications". **Optional. See Section 5.0, "Typical Applications", for details. NOTES: Over- Temperature Interrupt Shutdown** Q1 +12V +5V* VDD VIN VAS VOUT RBASE CF 1 µF CF TC648 Fan CB 0.01 µF CB 0.01 µF CB 1 µF +5V |
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