參數(shù)資料
型號(hào): ADM1027ARQZ-RL7
廠商: ON Semiconductor
文件頁數(shù): 21/56頁
文件大小: 1822K
描述: IC REMOTE THERMAL CTLR 24QSOP
產(chǎn)品變化通告: MFG CHG Notification ADI to ON Semi
Product Discontinuation Notice 25/Aug/2008
Product Obsolescence 30/Sept/2009
標(biāo)準(zhǔn)包裝: 1,000
系列: dBCool®
功能: 風(fēng)扇控制,溫度監(jiān)控器
傳感器類型: 內(nèi)部和外部
感應(yīng)溫度: 0°C ~ 105°C,外部傳感器
精確度: ±1°C
拓?fù)洌?/td> ADC,比較器,風(fēng)扇速度計(jì)數(shù)器,多路復(fù)用器,寄存器庫
輸出類型: SMBus?
輸出警報(bào):
輸出風(fēng)扇:
電源電壓: 3 V ~ 5.5 V
工作溫度: 0°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 24-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 24-QSOP
包裝: 帶卷 (TR)
REV. A
ADM1027
21
ADM1027
PWM3
2.2k
10k
3.3V
Q1
MMBT3904
3.3V
10
TACH3
Q2
MMBT2222
10
TACH4
12V
Q3
MMBT2222
Figure 20. Interfacing Two Fans in Parallel to the PWM3 Output Using Low Cost NPN Transistors
ADM1027
TACH4
10k
TYPICAL
3.3V
TACH
TACH3
10k
TYPICAL
3.3V
PWM3
10k
TYPICAL
3.3V
+V
Q1
NDT3055L
5V OR 12V
FAN
TACH
5V OR 12V
FAN
+V
Figure 21. Interfacing Two Fans in Parallel to the PWM3 Output Using a Single N-Channel MOSFET
Driving 2 Fans From PWM3
Note that the ADM1027 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 20
shows how to drive two fans in parallel using low cost NPN
transistors. Figure 21 is the equivalent circuit using the
NDT3055L MOSFET. Note that since 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 that the PWM pins are not required to
source current, and that they sink less than the 8 mA max cur-
rent specified on the data sheet.
Rev. 3 | Page 21 of 56 | www.onsemi.com
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