Diodes AH5795 - Manual (Page 8)

AH5795
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
AH5795
Document number: DS35277 Rev. 1 - 2
8 of 13
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August 2011
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Application Note (cont.)
Rotor lock Toff and PWM signal
When PWM signal input at PWM pin is low for longer than 65ms, internal rotor lock protection Toff is cleared. This allows the
device to enter motor start Ton time on the next PWM high signal
PWM
Rotor lock protection
(internal signal)
Enabled
Disabled
(Toff cleared)
Enabled
65ms (max)
Soft Switching
AH5795 uses soft switching of the motor coil current during commutation for to minimize audible switching noise and
electromagnetic interference (EMI) to provide a low noise solution.
Vdd
Vss
Vout 1
Vout 2
200µs typ.