參數(shù)資料
型號(hào)： L6229QTR
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)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(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 521K
代理商： L6229QTR
Circuit description
L6229Q
14/28
Doc ID 15209 Rev 3
Figure 10.
Output current regulation waveforms
Figure 11 shows the magnitude of the Off Time tOFF versus COFF and ROFF values. It can be
approximately calculated from the equations:
tRCFALL = 0.6 ROFF COFF
tOFF = tRCFALL + tDT = 0.6 ROFF COFF + tDT
where ROFF and COFF are the external component values and tDT is the internally generated
Dead Time with:
20 k
Ω ≤ R
OFF ≤ 100 kΩ
0.47 nF
≤ C
OFF ≤ 100 nF
tDT = 1 s (typical value)
Therefore:
tOFF(MIN) = 6.6 s
tOFF(MAX) = 6 ms
These values allow a sufficient range of tOFF to implement the drive circuit for most motors.
The capacitor value chosen for COFF also affects the Rise Time tRCRISE of the voltage at the
pin RCOFF. The rise time tRCRISE will only be an issue if the capacitor is not completely
charged before the next time the monostable is triggered. Therefore, the on time tON, which
depends by motors and supply parameters, has to 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).
OFF
BC
DD
A
tON
tOFF
BC
ON
2.5V
0
Slow Decay
1
μs tBLANK
tRCRISE
SYNCHRONOUS RECTIFICATION
1
μs tBLANK
5V
VRC
VSENSE
VREF
IOUT
VREF
RSENSE
D02IN1351
tOFF
1
μs tDT
1
μs tDT
tRCFALL
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