參數(shù)資料
型號(hào)： MAX6650EUB+
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Fan-Speed Regulators and Monitors with SMBus&trade;/I<sup>2</sup>C-Compatible Interface
中文描述： BRUSHLESS DC MOTOR CONTROLLER, 0.1 A, PDSO10
封裝： MICRO MAX PACKAGE-10
文件頁(yè)數(shù)： 5/25頁(yè)
文件大?。?/td> 235K
代理商： MAX6650EUB+
tion, use DAC values between 08h and B0h (see
Typical Operating Characteristics). When using the
closed-loop mode of operation, the contents of the
DAC Register are ignored. When writing to the DAC,
wait at least 500s before attempting to read back.
Power-on Reset (POR)
The MAX6650/MAX6651 have volatile memory. To pre-
vent ambiguous power-supply conditions from corrupt-
ing the data in the memory and causing erratic
behavior, a POR voltage detector monitors VCC and
clears the memory if VCC falls below 1.6V. When power
is first applied and VCC rises above 1.6V, the logic
blocks begin operating (though reads and writes at
VCC levels below 3V are not recommended).
Power-up defaults include the following:
All alarms are disabled.
Prescale divider is set to 4.
Fan speed is set in full-on mode.
See Table 2 for the default states of all registers.
Applications Information
MOSFET and Bipolar Transistor
Selection
The MAX6650/MAX6651 drive an external N-channel
MOSFET that requires five important parameters for
proper selection: gate-to-source conduction threshold,
maximum gate-to-source voltage, drain-to-source
breakdown voltage, current rating, and drain-to-source
on-resistance (RDS(ON)). Gate-to-source conduction
threshold must be compatible with available VCC. The
maximum gate-to-source voltage and the drain-to-
source breakdown voltage rating should both be at
least a few volts higher than the fan supply voltage
(VFAN). Choose a MOSFET with a maximum continuous
drain current rating higher than the maximum fan cur-
rent. RDS(ON) should be as low as practical to maxi-
mize the feedback voltage range. Maximum power
dissipation in the power transistor can be approximat-
ed by P = (VFAN X IFAN(MAX)) / 4. Bipolar power transis-
tors are practical for driving small and midsize fans
(Figure 6). Very-high-current fans may require output
transistor base current greater than the MAX6650’s
50mA drive capability. Bipolar Darlington transistors
will work but have poor saturation characteristics and
could lose up to 2V to 3V of drive voltage.
Resistor Selection
The tachometer input voltages (VTACH_) and feedback
voltage (VFB) cannot exceed 13.2V (see Absolute
Maximum Ratings). When using a fan powered by a
13.2V or greater supply (VFAN), protect these inputs
from overvoltage conditions with series resistors. The
resistance required to protect these pins may be calcu-
lated from the following equation:
RPROTECT = [(VFAN(MAX) - 13.2V) x RIN] / 13.2V
where VFAN(MAX) is the worst-case maximum supply
voltage used to power the fan and RIN is the input
MAX6650/MAX6651
Fan-Speed Regulators and Monitors
with SMBus/I2C-Compatible Interface
______________________________________________________________________________________
13
MAX6650
VCC
SCL
10k
Ω
SDA
GPIO0
OUT
ADD
GND
FB
TACH0
VCC
3V TO 5.5V
VFAN
5V OR 12V
CCOMP
10
μF
SMBus/I2C
INTERFACE
GPIO1
FAN
FULL ON
ALERT
Figure 6. Fan Control with a Bipolar Transistor
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6650EUB+ 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6650EUB+T 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6650EUB-T 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6651EEE 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6651EEE+ 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
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