L6480不能在VS被移除的系统中使用吗

你好，
我期待在外部提供的模式下使用L6480，我的系统将提供：

VS = + 24V DCVSREG / VCC = + 12V
VCCREG / VREG = + 3.3V
在紧急停止条件下，系统提供给VS的+ 24V被移除（浮动）。
L6480可以处理这种情况，即VS和VBOOT被移除，但其他轨道仍分别提供+ 12V和+ 3.3V？
在数据表的第34页上有一个注释说明
当由于紧急停止条件而移除VS时​​，VSREG将比VBOOT（浮动）大+ 12V，导致内部保护二极管导通。
然而，它继续说没有方向，额定值的细节，也不会导致这种大的电压差导致不希望的操作。
这是我对二极管感到困惑的地方。关于方向，二极管的阳极连接到VSREG，阴极连接到VS.

在紧急停止条件期间，这将通过+ 12V，减去二极管的正向压降，到VS引脚和电荷泵，并尝试继续通过二极管从+ 12V电源为电机供电。使用二极管反向取向，VS较小的二极管正向电压将施加到VSREG + 12V，这违反了VSREG的7.5-15V限值。
当VS被移除时，我可以安全地使用没有二极管的L6480吗？
或者L6480不能在VS被移除的系统中使用？
谢谢，
布拉德

＃l6480-电源



以下为原文




Hello,
I am looking at using the L6480 in the externally supplied modes, where my system will be supplying:

VS = +24V DCVSREG/VCC = +12V
VCCREG/VREG = +3.3V
The +24V supplied to VS by the system is removed (floating) during an emergency stop condition.
Can the L6480 handle this situation where VS and thus VBOOT is removed, but the other rails are still supplied with the +12V and +3.3V respectively?
On page 34 of the data sheet there is a note that states
When VS is removed due to an emergency stop condition, VSREG will be +12V greater than VBOOT (floating), causing the internal protection diode turnon.
It goes on to say however there is no detail of direction, rating nor if this will cause undesired operation with such a large difference in voltage.
This is where I am confused about the diode. Regarding direction, the diode would have the anode connected to VSREG and the cathode to VS.


During the emergency stop condition this would pass the +12V, less the forward voltage drop of the diode, to the VS pins and charge pump, and try to continue to power the motor from the +12V supply via the diode.With the diode in the reversed orientation, VS less the diode forward voltage would be applied to the VSREG +12V which violates the 7.5-15V limit of VSREG.
So can I SAFELY use the L6480 without diodes when VS is removed?
Or the L6480 cannot be used in a system where VS is removed?
Thanks,
Brad

#l6480-power-supply