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TC647VUA Fiches technique(PDF) 9 Page - Microchip Technology |
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TC647VUA Fiches technique(HTML) 9 Page - Microchip Technology |
9 / 28 page 2002 Microchip Technology Inc. DS21447C-page 9 TC647 5.0 TYPICAL APPLICATIONS Designing with the TC647 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 TC647 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 TC647 should consult the documen- tation for both TC642EV and (DS21403) and TC642DEMO (DS21401). Figure 5-1 shows the base schematic for the TC642DEMO. FIGURE 5-1: Typical Application Circuit. FAULT SENSE NTC R1 R2 R3 R4 GND Fan Fault 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 TC647 Fan 1 8 6 7 5 4 2 3 CB 1 µF CB 0.01 µF CB 0.01 µF |
Numéro de pièce similaire - TC647VUA |
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Description similaire - TC647VUA |
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