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L6235Q bảng dữ liệu(PDF) 13 Page - STMicroelectronics

tên linh kiện L6235Q
Giải thích chi tiết về linh kiện  Tacho output for speed loop
PDF  33 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6235Q bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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L6235Q
Circuit description
Doc ID 018997 Rev 2
13/33
Figure 12 shows the lower limit for the ON time tON for having a good PWM current
regulation capacity. It should be mentioned that tON is always bigger than tON(MIN) because
the device imposes this condition, but it can be smaller than tRCRISE - tDT. In this last case
the device continues to work but the OFF time tOFF is not more constant.
Therefore, a small COFF value gives more flexibility to the applications (allows smaller ON
time and, therefore, higher switching frequency), but, the smaller the value for COFF, the
more influential the noises on the circuit performance.
Figure 11.
tOFF vs. COFF and ROFF
t
ON
t
ON MIN
()
>
t
ON
t
RCRISE
t
DT
–
>
⎩
⎪
⎨
⎪
⎧
1.5
μstyp
()
=
t
RCRISE
600 C
OFF
⋅
=
0.1
1
10
100
1
10
100
1 .10
3
1 .10
4
Coff [nF]
Roff = 100kΩ
Roff = 47kΩ
Roff = 20kΩ



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