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L6207 Arkusz danych(PDF) 10 Page - STMicroelectronics

Numer części L6207
Szczegółowy opis  DMOS DUAL FULL BRIDGE DRIVER WITH PWM CURRENT CONTROLLER
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6207 Arkusz danych(HTML) 10 Page - STMicroelectronics

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L6207
10/23
Figure 8. Output Current Regulation Waveforms
Figure 9 shows the magnitude of the Off Time tOFF versus COFF and ROFF values. It can be approximately cal-
culated 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:
20K
Ω ≤ ROFF ≤ 100KΩ
0.47nF
≤ COFF ≤ 100nF
tDT = 1µs (typical value)
Therefore:
tOFF(MIN) = 6.6µs
tOFF(MAX) = 6ms
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
OFF
BC
DD
A
tON
tOFF
BC
ON
2.5V
0
Slow Decay
Slow Decay
1
µs tBLANK
tRCRISE
tRCRISE
SYNCHRONOUS RECTIFICATION
1
µs tBLANK
5V
VRC
VSENSE
VREF
IOUT
VREF
RSENSE
D02IN1351
tOFF
1
µs tDT
1
µs tDT
tRCFALL
tRCFALL


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