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L6207 bảng dữ liệu(PDF) 16 Page - STMicroelectronics

tên linh kiện L6207
Giải thích chi tiết về linh kiện  APPLICATION NOTE
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6207 bảng dữ liệu(HTML) 16 Page - STMicroelectronics

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AN1762 APPLICATION NOTE
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be bigger than tRCRISE for allowing a good current regulation by the PWM stage. Furthermore, the on time tON
can not be smaller than the minimum on time tON(MIN).
tRCRISE = 600 · COFF
3.11.1 Off-time Selection and minimum on-time (L6207 ONLY)
Figure 16 also shows the lower limit for the on time tON for having a good PWM current regulation capacity. It
has to be said 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 con-
stant.
So, small COFF value gives more flexibility for the applications (allows smaller on time and, therefore, higher
switching frequency), but, the smaller is the value for COFF, the more influential will be the noises on the circuit
performance.
Figure 16. Off-time selection and minimum on-time (L6207 ONLY).
t
ON
t
ON MIN
()
>1.5
µs (typ. value)
=
t
ON
t
RCRISE
t
DT
–
>
0.1
1
10
100
1
10
100
1 . 10
3
1 . 10
4
Coff [nF]
0.1
1
10
100
1
10
100
Coff [nF]
R = 20 k
Ω
R = 47 k
Ω
R = 100 k
Ω



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