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參數(shù)資料
| 型號： | NCT7491RQR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 28/80頁 |
| 文件大小： | 844K |
| 描述： | IC REMOTE THERMAL MONITOR 24QSOP |
| 標準包裝： | 2,500 |
| 系列： | * |
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NCT7491
http://onsemi.com
28
Figure 16. Driving a 4Wire Fan
Driving Two Fans from PWM3
The NCT7491 has four TACH inputs available for fan
speed measurement, but only three PWM drive outputs. If a
fourth fan is being used in the system, it should be driven
from the PWM3 output in parallel with the third fan.
Figure 17 shows how to drive two fans in parallel using a
MOSFET. Because the MOSFET can handle up to 3.5 A, it
is simply a matter of connecting another fan directly in
parallel with the first. Care should be taken in designing
drive circuits with transistors and FETs to ensure the PWM
outputs are not required to source current, and that they sink
less than the 5 mA maximum current specified in the data
sheet.
Figure 17. Interfacing Two Fans in Parallel to the PWM3 Output Using a Single NChannel MOSFET
Driving up to Three Fans from PWM3
TACH measurements for fans are synchronized to
particular PWM channels; for example, TACH1 is
synchronized to PWM1. TACH3 and TACH4 are both
synchronized to PWM3, so PWM3 can drive two fans.
Alternatively, PWM3 can be programmed to synchronize
TACH2, TACH3, and TACH4 to the PWM3 output. This
allows PWM3 to drive two or three fans. In this case, the
drive circuitry looks the same, as shown in Figure 17. The
SYNC bit in Register 0x62 enables this function.
Synchronization is not required in high frequency mode
when used with 4wire fans.
Setting bit 4 of register 0x62 (SYNC) to 1 synchronizes
TACH2, TACH3, and TACH4 to PWM3.
TACH Inputs
Pins 9, 11, 12 and 14 on the QSOP package or pins 6, 8,
9 and 11 on the QFN package (when configured as TACH
inputs) are high impedance inputs intended for fan speed
measurement. Signal conditioning in the NCT7491
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