- 您现在的位置：买卖IC网 > PDF目录67801 > MAX6651EEE+ (MAXIM INTEGRATED PRODUCTS INC) Fan-Speed Regulators and Monitors with SMBus™/I<sup>2</sup>C-Compatible Interface PDF资料下载
参数资料
| 型号： | MAX6651EEE+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | Fan-Speed Regulators and Monitors with SMBus™/I<sup>2</sup>C-Compatible Interface |
| 中文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.1 A, PDSO16 |
| 封装： | QSOP-16 |
| 文件页数： | 5/25页 |
| 文件大小： | 235K |
| 代理商： | MAX6651EEE+ |
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
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6652AUB+ | Temperature Sensor and System Monitor in a 10-Pin µMAX |
| MAX6652AUB+T | Temperature Sensor and System Monitor in a 10-Pin µMAX |
| MAX6654MEE+ | 1°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface |
| MAX6654YMEE+ | 1°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface |
| MAX6655MEE+ | Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6651EEE+ | 功能描述:马达/运动/点火控制器和驱动器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MAX6651EEE+T | 功能描述:马达/运动/点火控制器和驱动器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MAX6651EEE+TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6651EEE-T | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MAX6651EVCMAXQU | 功能描述:电源管理模块 MAX6651 Evaluation Kit/Evaluation System RoHS:否 制造商:ROHM Semiconductor 产品:AC-DC Converters 最大输入电压:264 VAC 开关频率: 输出电压:10 V to 28.8 V 输出电流:350mA 负载调节: 最大工作温度:+ 60 C 尺寸:100 mm x 16 mm x 17 mm |
发布紧急采购，3分钟左右您将得到回复。