参数资料
型号: L6228QTR
厂商: STMICROELECTRONICS
元件分类: 运动控制电子
英文描述: STEPPER MOTOR CONTROLLER, QCC32
封装: 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件页数: 7/32页
文件大小: 491K
代理商: L6228QTR
L6228Q
Circuit description
Doc ID 14321 Rev 4
15/32
tRCRISE = 600 COFF
Figure 15 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 14.
tOFF versus COFF and ROFF
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
s]
Roff = 100kΩ
Roff = 47kΩ
Roff = 20kΩ
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