Datenblatt-Suchmaschine für elektronische Bauteile |
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TC651ADUA Datenblatt(PDF) 8 Page - STMicroelectronics |
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TC651ADUA Datenblatt(HTML) 8 Page - STMicroelectronics |
8 / 16 page TC650/TC651 DS21450C-page 8 2004 Microchip Technology Inc. 4.6 Temperature Selection Guide (Minimum Fan Speed/Full Speed) There are two temperature thresholds that determine the characteristics of the device. The minimum fan speed temperature (TL) and the full fan speed temper- ature (TH). Depending on the TC65X device selected, when the temperature is below the TL trip point, the PWM output will perform a different operation. For the TC650, the PWM will be driven at the minimum PWM frequency, while the TC651 will shut down the PWM (PWM = L). TL and TH can be selected in 5°C increments. TL can range from 25°C to 35°C. TH can range from 35°C to 55°C and must be 10°C (or more) than the specified TL. The five temperature regions defined by the six thresholds are defined in the TC650/TC651 by means of factory trimming. Once a TL and TH are set, the T1 – T4 thresholds are automatically equally spaced between TL and TH. Table 4-1 shows these 5 regions and what the corresponding PWM duty cycle is. TABLE 4-1: TEMPERATURE RANGE DEFINITION Table 4-2 shows the device codes that specify the TH and TL temperature thresholds. The following exam- ples are given to assist in understanding the device- ordering nomenclature. Example 1: Suppose you wanted the fan to run at 40% speed at 25°C or less and go to full- speed at 45°C. You would order the part number TC650AEVUA. Example 2: Suppose you wanted the fan to turn on at 30°C and go to full speed at 45°C. You would order the part number TC651BEVUA. TABLE 4-2: DEVICE CODES FOR TEMPERATURE THRESHOLDS Temperature (T = TJ) (Note 1) PWM Duty Cycle TC650 (Minimum Speed mode) TC651 (Auto-shutdown mode) T < TL 40% Off TL< = T < T1 50% 50% T1 < = T < T2 60% 60% T2 < = T <T3 70% 70% T3 < = T < T4 80% 80% T4 < = T < TH 90% 90% TH < = T < TOV 100% 100% TOV < = T 100% with Overtemperature Alert (TOVER = L) Note 1: The temperature regions defined by the six temperature thresholds are pre- defined in the TC650/TC651 by means of factory trimming. Once a TL and TH are programmed, the T1 – T4 thresholds are automatically equally spaced between TL and TH. Temp. Threshold Difference TL TH Threshold Limits Code 10°C 25 35 AC (1) 30 40 BD (2) 35 45 CE (2) 15°C 25 40 AD (2) 30 45 BE (1) 35 50 CF (2) 20°C 25 45 AE (1) 30 50 BF (2) 35 55 CG (1) 30°C 25 55 AG (1) Note 1: This temperature threshold option is available for ordering. 2: This is a custom temperature threshold option. Please contact the factory for more information. |
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