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AN4158 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN4158
Description  Peak current control with automatic decay adjustment
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4158 Datasheet(HTML) 18 Page - STMicroelectronics

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Peak current control with PWM and constant off-time
AN4158
18/34
DocID023635 Rev 2
Equation 8
When the current drop
IphOFF becomes lower than IphON,Min, the stability equation can no
longer be satisfied and the current control fails. The current starts to increase until stability is
restored (it is possible because
IphOFF increases with the current) and the actual peak
current is different than the target one. The minimum on-time limit is usually reached at low
target currents, motor windings with a high LPh/RPh ratio, and when slow decay is used
during the off-time.
Figure 13. Peak current control unstable
Figure 12. Minimum on-time
V
Ph
I
sense
I
Ph
Reference current
t
comm
I
PhON,Min
AM15114v1
I
Ph
VBUS LPh tcomm

t
OFF
t
OFF
I
Target
IPeak
t
comm
t
OFF
t
comm
t
OFF
t
comm
t
OFF
t
comm
t
OFF
t
comm
IPhOFF =
I
PhONMin
Δ
Δ
AM15115v1



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