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TMP12 bảng dữ liệu(PDF) 5 Page - Analog Devices |
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TMP12 bảng dữ liệu(HTML) 5 Page - Analog Devices |
5 / 12 page REV. B –5– TMP12 SUPPLY VOLTAGE (V) 500 0 450 400 350 300 250 200 150 100 50 0 12345678 TA = 25 C NO LOAD HEATER OFF TPC 10. Supply Current vs. Supply Voltage TEMPERATURE ( C) 0.5 –75 0.4 0.3 0.2 0.1 0 –25 25 75 125 175 V+ = 4.5V TO 5.5V NO LOAD HEATER OFF TPC 11. VPTAT Power Supply Rejection vs. Temperature TEMPERATURE ( C) 40 –75 36 32 28 24 20 –25 25 75 125 175 38 34 30 26 22 VOL = 1V V+ = 5V TPC 12. Open-Collector Output Sink Current vs. Temperature APPLICATIONS INFORMATION A typical application for the TMP12 is shown in Figure 2. The TMP12 package is placed in the same cooling airflow as a high power dissipation IC. The TMP12’s internal resistor produces a temperature rise that is proportional to air flow, as shown in Figure 3. Any interruption in the air flow will produce an addi- tional temperature rise. When the TMP12 chip temperature exceeds a user-defined setpoint limit, the system controller can take corrective action, such as reducing clock frequency, shutting down unneeded peripherals, turning on additional fan cooling, or shutting down the system. PGA PACKAGE PGA SOCKET POWER IC AIR FLOW PC BOARD TMP12 Figure 2. Typical Application TEMPERATURE ( C) 700 –75 500 300 100 –25 25 75 125 175 600 400 200 0 LOAD = 10mA LOAD = 5mA LOAD = 1mA TPC 13. Open-Collector Voltage vs. Temperature TMP12 PD (mW) 65 60 35 0 250 50 100 150 200 55 50 45 40 A B C D E A. TMP12 DIE TEMP NO AIR FLOW B. HIGH SETPOINT C. LOW SETPOINT D. TMP12 DIE TEMP MAX AIR FLOW E. SYSTEM AMBIENT TEMPERATURE Figure 3. Choosing Temperature Setpoints Temperature Hysteresis The temperature hysteresis at each setpoint is the number of degrees beyond the original setpoint temperature that must be sensed by the TMP12 before the setpoint comparator will be reset and the output disabled. Hysteresis prevents chatter and motorboating in feedback control systems. For monitoring tem- perature in computer systems, hysteresis prevents multiple interrupts to the CPU which can reduce system performance. |
Số phần tương tự - TMP12_15 |
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Mô tả tương tự - TMP12_15 |
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