 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ADT7462ACPZ-R7 Datasheet(PDF) 38 Page - ON Semiconductor |
|
|
|||||||||||||||||||||||||||||
ADT7462ACPZ-R7 Datasheet(HTML) 38 Page - ON Semiconductor |
|
|
38 / 81 page  ADT7462 http://onsemi.com 38 TRANGE for different PWMMIN values can be calculated using Equation 7. (eq. 7) TMAX + TMIN ) (Max DC * Min DC) TRANGE 170 where (Max DC − Min DC) × TRANGE/170 is the effective TRANGE value. Figure 60 shows PWM duty cycle vs. temperature for each TRANGE setting. The lower graph shows how each TRANGE setting affects fan speed vs. temperature. As shown in the graph, the effect on fan speed is nonlinear. Figure 60. TRANGE vs. Actual Fan Speed Profile TEMPERATURE ABOVE TMIN 0 20406080 100 120 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE ABOVE TMIN 0 20 40 60 80 100 120 0 10 20 30 40 50 60 70 80 90 100 25C 805C 53.35C 405C 325C 26.65C 205C 165C 13.35C 105C 85C 6.675C 55C 45C 3.335C 2.55C 25C 805C 53.35C 405C 325C 26.65C 205C 165C 13.35C 105C 85C 6.675C 55C 45C 3.335C 2.55C The graphs in Figure 60 assume that the fan starts from 0% PWM duty cycle. Clearly, the minimum PWM duty cycle, PWMMIN, needs to be factored in to see how the loop actually performs in the system. Figure 61 shows how TRANGE is affected when the PWMMIN value is set to 20%. It can be seen that the fan runs about 45% fan speed when the temperature exceeds TMIN. Example: Determining TRANGE for Each Temperature Channel The following example shows how the different TMIN and TRANGE settings can be applied to three different thermal zones. In this example, the following TRANGE values apply: TRANGE = 80°C for ambient temperature TRANGE = 53.3°C for CPU temperature TRANGE = 40°C for VRM temperature Figure 61. TRANGE vs. % Fan Speed Slopes with PWMMIN = 20% TEMPERATURE ABOVE TMIN 0 20 40 60 80 100 120 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE ABOVE TMIN 0 20 40 60 80 100 120 0 10 20 30 40 50 60 70 80 90 100 25C 805C 53.35C 405C 325C 26.65C 205C 165C 13.35C 105C 85C 6.675C 55C 45C 3.335C 2.55C 25C 805C 53.35C 405C 325C 26.65C 205C 165C 13.35C 105C 85C 6.675C 55C 45C 3.335C 2.55C This example uses the MUX configuration described in the Step 1 − Configuring the MUX section. Both CPU temperature and VRM temperature drive the CPU fan connected to PWM1. Ambient temperature drives the front chassis fan and rear chassis fan connected to PWM2 and PWM3. The front chassis fan is configured to run at PWMMIN= 20%. The rear chassis fan is configured to run at PWMMIN= 30%. The CPU fan is configured to run at PWMMIN= 10%. |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
