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TC622VAT 数据表(PDF) 6 Page - Microchip Technology |
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TC622VAT 数据表(HTML) 6 Page - Microchip Technology |
6 / 14 page TC622/TC624 DS21440B-page 6 © 2002 Microchip Technology Inc. 4.0 TYPICAL APPLICATIONS 4.1 Over-Temperature Shutdown TheTC622 canbe used tocreate a simple over-tem- perature shutdown circuit. In this circuit, temperature is sensed within the system enclosure (internal system ambient) or at the heatsink itself. When measured temperature exceeds a preset limit, a fault is indicated and the system shuts down. Figure 4-1 illustrates an over-temperature shutdown circuit using the TC622 sensor in a single TO-220 package, allowing direct attachment to the heatsink surface. As shown, the TC622 outputs are driven active when the heatsink temperature equals the trip point temperature set by RTRIP. When this happens, the crowbar circuit is activated, causing the supply output to fold back to zero. The TC622 outputs remain active until the heatsink temperature falls a minimum of 2°C (built-in hysteresis) below the trip point temperature, at which time the device again allows normal supply operation. 4.2 Cooling and Heating Applications The TC622/TC624 can be used to control a DC fan as shown in Figure 4-2. The fan turns on when the sensed temperature rises above TSET and remains on until the temperature falls below TSET -2°C. Figure 4-3 shows the TC622 acting as a heater thermostat. Circuit operation is identical to that of the cooling fan application. FIGURE 4-1: TC622 POWER SUPPLY OVER-TEMPERATURE SHUTDOWN Heatsink Circuit Board TC622 Heatsink Mounting TC622 TC622 RTRIP VCC Output Device Heatsink Surface Power Good Signal OVERTEMP Crowbar Circuit TSET GND VDD VOUT OUT OUT Output Device |
类似零件编号 - TC622VAT |
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类似说明 - TC622VAT |
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