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LM56CIMX bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI) |
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LM56CIMX bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI) |
11 / 13 page Application Hints (Continued) where I B = 300 nA (the maximum specified error). The current shown in Figure 6 is a simple overtemperature detector for power devices. In this example, an audio power amplifier IC is bolted to a heat sink and an LM56 Celsius temperature sensor is mounted on a PC board that is bolted to the heat sink near the power amplifier. To ensure that the sensing element is at the same temperature as the heat sink, the sensor’s leads are mounted to pads that have feed throughs to the back side of the PC board. Since the LM56 is sensing the temperature of the actual PC board the back side of the PC board also has large ground plane to help conduct the heat to the device. The comparator’s output goes low if the heat sink temperature rises above a threshold set by R1, R2, and the voltage reference. This fault detection output from the comparator now can be used to turn on a cooling fan. The circuit as shown in design to turn the fan on when heat sink temperature exceeds about 80˚C, and to turn the fan off when the heat sink temperature falls below ap- proximately 75˚C. 01289321 FIGURE 6. Audio Power Amplifier Overtemperature Detector 01289322 FIGURE 7. Simple Thermostat www.national.com 11 |
Số phần tương tự - LM56CIMX |
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Mô tả tương tự - LM56CIMX |
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