Datasheet > MLX90401KDF

MLX90401KDF

更新时间： 2024-02-01 10:35:38

品牌	Logo	应用领域
迈来芯 - MELEXIS		光电二极管电机控制器
页数	文件大小	规格书
13页	617K
描述
Brushless DC Motor Controller

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MLX90401KDF 技术参数

生命周期：	Active	包装说明：	SOP, SOP24,.4
Reach Compliance Code：	compliant	风险等级：	5.74
JESD-30 代码：	R-PDSO-G24	端子数量：	24
最高工作温度：	125 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP24,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	电源：	15 V
认证状态：	Not Qualified	子类别：	Motion Control Electronics
最大供电电流 (Isup)：	35 mA	标称供电电压 (Vsup)：	15 V
表面贴装：	YES	技术：	CMOS
温度等级：	AUTOMOTIVE	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
Base Number Matches：	1

MLX90401KDF 数据手册

MLX90401

Brushless DC Motor Controller

7.3 Commutation decoding and output control logic

An internal digital circuit converts the signals from the Hall-effect position sensors into the proper

sequencing of top and bottom drive outputs.

60° or 120° sensor electrical phasing can be selected by an external pin (60°/120° Select, pin 11).

The Forward/Reverse input (pin 6) is used to change the direction of motor rotation.

If the /Brake input (pin 9) is pulled low, bottom drivers are turned on, while top drivers are turned off, thus

braking the motor.

These six inputs all have internal pull-up resistors (3.3kΩ to 5V).

Inputs 60°/120° Select, Fwd/Rev and /Brake are debounced to make sure that the device doesn’t enter the

wrong state, due to noise and/or spikes.

The fact that these signals are debounced, also means that there is a delay in these signals. Whenever one

of the external signals that are debounced is changed, it takes time till the outputs change accordingly (ca.

25ms for the 60°/120° Select and Fwd/Rev inputs, ca. 3ms for /Brake).

After start-up, the outputs are disabled for a given time, in order to provide for the time necessary for the

debouncing circuits on 60°/120° Select and Fwd/Rev to settle and output the correct signal.

(/Brake is debounced with a shorter time so settles a lot sooner.)

7.4 Oscillator

The frequency of the internal sawtooth oscillator is set by the values selected for timing components R_OSC

and C_OSC(see Figure 4 : Typical application). Capacitor C_OSCis charged from the Reference Output (Pin 2)

through Resistor R_OSCand discharged by an internal discharge transistor. The ratio of the ramp peak and

valley voltages referred to the Reference Output voltage are typically 0.65V and 0.3V respectively. To

provide a good compromise between audible noise and output switching efficiency, an oscillator frequency

in the range of 20 to 30 kHz is recommended.

7.5 Disable

Pin 7, Speed Adjust Input/Disable, is to be connected to an external potentiometer, used to set motor

speed.

The input can also be used as a Disable input, turning off all output drivers. This Disable input can be used

in many ways. A thermal switch could be used to provide thermal protection. Or a Hall switch could be used

to provide protection against overcurrent, etc.

Disable has a higher priority than /Brake. If for instance Disable is active, braking will not have any effect. If

/Brake is active at the moment that Disable is made active, all braking will be stopped.

3901090401

Rev 005

Page 7 of 13

Data sheet

Oct/05

1...4 5 678 9 10...13

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