E-L8150 STMICROELECTRONICS [STMicroelectronics], E-L8150 Datasheet - Page 28

• Manufacturer Part Number: E-L8150
• Description: Brushless motor predriver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Precharge and hall effects filtering time description
6.2
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for the successive TelMAX/6 and the behaviour is the one described in the startup sequence
with motor stopped.
Startup sequence with SD signal
●
Figure 18. Startup sequence forced by SD, supposing the motor stopped
When the SD signal has a falling edge (corresponding to a VREG signal that's crossing the
lower voltage protection), the logic can produce a ZC signal, depending on FS signal
behaviour induced by Vsp voltage value. In any case, even if no ZC signal is produced, if the
motor is stopped and no Hall effect commutation is detected, the counter reaches its
saturation time TelMAX/6 and the system evolves like in the situation described in previous
startup sequence with motor stopped.
●
Figure 19. Startup sequence forced by SD, supposing the motor rotating quickly in
Let's consider a startup sequence forced by SD, supposing the motor stopped:
Let's consider a startup sequence forced by SD, supposing the motor rotating quickly in
the direction imposed by the FR signal:
SD
ZC
HALL BUS
FILTER TIME
PHASES
SD
PRECHARGE
ZC
HALL BUS
FILTER
TIME
PHASES
the direction imposed by the FR signal
TelMax/6
400 us
T∆zc
400 us
PHASES EXCITED
MOTOR ACCELERATING
T∆zc
400 us
400 us
PHASES EXCITED
T∆zc/576
400 us
T∆zc/576
400 us
Tel
400 us
T∆zc/576
U
T∆zc/576
T∆zc/576
Tel
L8150