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TC649VUA 데이터시트(PDF) 9 Page - Microchip Technology |
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TC649VUA 데이터시트(HTML) 9 Page - Microchip Technology |
9 / 28 page 2002 Microchip Technology Inc. DS21449C-page 9 TC649 5.0 TYPICAL APPLICATIONS Designing with the TC649 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. (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 TC649 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 TC649 should consult the documen- tation for both TC642EV (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 *See cautions regarding Latch-up Considerations in Section 5.0, "Typical Applications". **Optional. See Section 5.0, "Typical Applications" for details. Notes: Fan Fault Shutdown Shutdown** Q1 +12V +5V* VDD VIN VAS VOUT RBASE RSENSE CSENSE CF 1 µF CF TC649 Fan CB 0.01 µF CB 0.01 µF CB 1 µF + +5V |
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