參數(shù)資料
型號： L6229QTR
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, 2.8 A, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件頁數(shù)： 7/28頁
文件大小： 521K
代理商： L6229QTR
L6229Q
Circuit description
Doc ID 15209 Rev 3
15/28
tRCRISE = 600 COFF
Figure 12 shows the lower limit for the on time tON for having a good PWM current regulation
capacity. It has to be said that t
ON is always bigger than t
ON(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.
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 11.
tOFF versus COFF and ROFF
Figure 12.
Area where tON can vary maintaining the PWM regulation
tON tON MIN
()
>
2.5
μs
=
t
ON
t
RCRISE
t
DT
–
>
(typ. value)
0.1
1
10
100
1
10
100
1.10
3
1.10
4
Coff [nF]
toff
[μ
s]
Roff = 100kΩ
Roff = 47kΩ
Roff = 20kΩ
0.1
1
10
100
1
10
100
Coff [nF]
to
n(
mi
n
)[us
]
2.5μs (typ. value)
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