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AN4158 bảng dữ liệu(PDF) 16 Page - STMicroelectronics

tên linh kiện AN4158
Giải thích chi tiết về linh kiện  Peak current control with automatic decay adjustment
PDF  34 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4158 bảng dữ liệu(HTML) 16 Page - STMicroelectronics

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Peak current control with PWM and constant off-time
AN4158
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DocID023635 Rev 2
When the slow decay is not able to decrease the phase current, the fast decay method can
be used. The fast decay forces the current reduction applying the supply voltage in reverse
direction. This way the current is actively reduced using the same voltage used to force it
into the phase during the on-time.
In this case the current drop and then the ripple are greater than with slow decay, but the
peak current is kept under control (see Equation 7).
Equation 7
Figure 10. Back electromotive force limiting the slow decay effectiveness
R
Ph
V
BEMF
I
Ph
L
Ph
Motor phase equivalent circuit
V
BEMF >> IPh x RPh
V
BEMF < 0
AM15112v1
I
Ph
RPh IPh VBUS
+
 L
Ph tOFF




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