L6472/L6474预测和峰值电流调节之间没有区别

我遇到了L6472当前规定的问题。我们制作了2个系列的电路板，一个配有L6474，另一个配有L6472。该板有8个通道，供电电压为24V / 3.3V，定时参数默认复位，内部振荡器。电机绕组有1.7欧姆，3.6mH。该板有4层35 m，包括24V和GND的实心平面。 L6474的一切都很好。利用L6472，相电流急剧地接近微步序列的过零点。所有通道都受到影响，但通常只有每个通道的一个相位。预测和峰值电流调节之间没有区别。我有几个想法可能是错的：

1）电流测量受一些地移效应的影响
2）电源电压太嘈杂
3）次优时序参数

我想知道在哪里先看。

＃l6472-current-regulation＃l6472-l6474-current-regulation



以下为原文




I am experiencing problem with the current regulation of the L6472. We made 2 series of boards, one was fitted with L6474s, the other one with L6472s. The board has 8 channels, supply voltage is 24V / 3.3V, timing parameters are reset default, internal oscillator. The motor windings have 1.7Ohm, 3.6mH. The board has 4 layers of 35�m including solid planes for 24V and GND. Everything is fine for the L6474. With the L6472 the phase current jumps wildly close to the zero crossing of the microstep sequence. All channels are affected, but usually only one phase of each channel. No difference between predictive and peak current regulation. I have several ideas what could be wrong:

1) Current measurement influenced by some ground shift effect
2) Supply voltage too noisy
3) Suboptimal timing parameters

I am wondering where to look first.
  
#l6472-current-regulation #l6472-l6474-current-regulation