工作参数：

名称：AM8931
封装：DFN 10L
品牌：Amtek 晶致
描述：三相无感电机驱动IC
工作电压：3.3~15V
输出电流：1A
工作温度：-40℃~+95℃
保持温度：-50℃~+150℃

产品特性：

1.  软启动功能；

2.  锁保护及自动重启；
3.  内置FG及RD；
4.  PWM速度控制；
5.  过流保护;
6.  过压保护；
7.  热关断保护；
8.  正反转控制；
9.  内置软启动功能，以降低噪音。

Operation notes

1)  VCC power supply line
The BEMF causes re-circulate current to power supply. Please connect a capacitor between
power supply VCC pin and ground as a route of re-circulate current. And please determine the
capacitance after confirmation that the capacitance does not causes any problems.
2)  VREG regulator
VREG is voltage regulator output and internal circuits used. Connect capacitors to ground for
stable operation.
3)  Ground potential
Ground potential E-PAD and GND pin connect the lowest voltage on the chip and short the path
as possible.
4)  PWM speed control
This IC offer PWM pin direct control output transistors for motor speed control. Higher frequency
will reduce output current noise. The control input frequency recommended operation between
20 KHz to 50 KHz. If frequency is slower than 7 KHz (typ.), it will go into stand-by mode.
This pin connects internal pull-high resistance of 200K ohm to VREG. When connect to VREG
or floating. The motor will rotate in the full speed.
5)  Soft Switching Circuits
This IC use duty-variable switching for low acoustic noise and vibration.
6)  Start-up Circuits
The OSC pin is defined a sensor-less start-up commutation frequency. The connecting
capacitor is between the OSC pin and ground. Variable Motors start-up characteristic are
variable with different capacitors. Variable Motors should select suitable capacitor for optimum
start-up characteristics. If the capacitance value is larger, the variation start-up time is longer.
Also, if the capacitance value is smaller, the motor start-up time is shorter and might cause
start-up failed by fan friction.
7)  FG / RD function
This FG or RD pin is made up with an open drain output.
Recommend connect a resistance of 10k ohm to supply.
8)  Thermal design and Thermal shutdown
The thermal design should allow enough margins for actual power dissipation. In case the IC is
left running over the allowable loss, the junction temperature rises, and the thermal-shutdown
circuit works at the junction temperature of 170°C (typ.) (the outputs of all the channels are
turned off). When the junction temperature drops to 145°C (typ.), the IC start operating again.
9)  F/R (Forward and Reverse) function
Motor direction can be forward or reverse by switching F/R voltage level.
F/R high (VREG): U -> V-> W and F/R low (ground): U->W->V.
Internal pull low resistor is 100k ohms.

企业名：深圳市正峰科电子有限公司

类型：贸易/代理/分销

电话： 0755-28102650

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联系人：张先生

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