L6207的速度怎么调节

阿尔弗雷多你好，
 
 
我不清楚你对“饮食问题”的意思是什么。你能解释一下吗？
 
在我看来，L6207的当前控制应该符合您的需求。由器件实现的恒定TOFF控制应该能够控制相电流，直到电动机BEMF低于电源电压。也可以使用EN引脚上的PWM，但在这种情况下，电流纹波可能很大，因为禁止输出桥接器会执行快速衰减。
还应考虑功耗：在L6207禁用期间，相电流流过功率桥的体二极管，这些二极管的效率低于MOS。
 
无论如何，如果您对PWM电流控制不感兴趣，可以使用L6205或L6206代替L6207。
 
问候
恩里科



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Hello Alfredo,


It is not clear to me what do you mean with ''eating problems''. Could you explain it?

In my opinion the current control of the L6207 should fit your needs. The constant TOFF control implemented by the device should be able to control the phase current until the motor BEMF is lower than the supply voltage. The PWM on the EN pin could be also used, but in this case the current ripple could be significant because disabling the output bridges a fast decay is performed.
Power dissipation should also be considered: during the time the L6207 is disabled, the phase current flows through the body diodes of the power bridges which are less ''efficient'' than MOS.

Anyway, if you are not interested in the PWM current control you could use L6205 or L6206 instead of L6207.

Regards
Enrico

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嗨阿尔弗雷多，
 
 
现在重点更清楚了。您正在使用PWM电流控制来限制电机电流，并且您希望使用L6207的使能引脚（电机电流的某种PWM）来调节电机速度。它是正确的？
 
在这种情况下，我认为这不是一个好主意，因为电机扭矩非常不连续（每次禁用芯片时都会产生强烈的减速）。
您可以使用PWM调制设置VREF值，这样您就可以调节电机电流，从而调节转矩和速度。
 
另一个选择是使用L6206并将过流阈值（PROGCL引脚）设置为最大电流并使用经典电压模式方法驱动直流电机：INX引脚上的PWM设置施加到直流电机的平均电压，并作为结果你可以控制速度。
 
再见
恩里科
 
附：你的英语不是很差，但如果你愿意，我们可以继续用意大利语。我更喜欢使用英语，以便让所有论坛成员都能发表意见。



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Hi Alfredo,


Now the point is clearer. You are using the PWM current control to limit the motor current and you want to regulate the motor speed using the enable pin of the L6207 (some kind of PWM of the motor current). It is correct?

In this case I think this is not a good idea because the motor torque is very discontinuous (every time you disable the chip you imposes a strong deceleration).
You could set the VREF value using a PWM modulation, this way you can regulate the motor current and as a consequence the torque and speed.

Another option is to used the L6206 and sets the overcurrent threshold (PROGCL pins) to your maximum current and drive the DC motor using the classic voltage mode approach: a PWM on the INX pins sets the mean voltage applied to the DC motor and as a consequence you can control the speed.

Ciao
Enrico

P.S. Your English is not so poor, but if you want we can continue in Italian. I prefer to use English in order to allows all forum members to give her/his opinion.

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由你处置。
 
再见
恩里科



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At your disposal.

Ciao
Enrico