A5936
Three Phase Sensorless Sinusoidal Fan Driver
FEATURES AND BENEFITS
DESCRIPTION
• Standby mode
The A5936 three phase motor driver incorporates sinusoidal
drive to minimize vibration for fan applications.
• Sensorless operation
• Low-noise sinusoidal modulation
• Quiet startup
• Low RDSON power MOSFETs
• Minimal external components
• PWM speed input
A sinusoidal voltage profile is applied to the windings of the
motor at startup to quickly and quietly start up and gradually
ramp up the motor to desired speed.
Themotorspeediscontrolledbyapplyingadutycyclecommand
to the PWM input. The PWM input is allowed to operate over
a wide frequency range.
• FG speed output
• Lock detection
• Soft start
• Short-circuit protection (OCP)
• Overcurrent limit (OCL)
The A5936 is available in a 10-lead SSOP (suffix LN), and
a 10-lead eSOIC with exposed power pad (suffix LK). The
packages are lead (Pb) free, with 100% matte-tin leadframe
plating.
PACKAGES:
10-lead SSOP (suffix LN)
10-lead eSOIC with exposed
thermal pad (suffix LK)
Not to scale
TYPICAL APPLICATION
0.1 µF X5R 10 V
VREF
2p8 VREF
OCP
Protection
VBB
10 µF
Duty
Demand
Calculator
Speed Input
PWM
OUTA
OUTB
OUTC
6
GATE
DRIVE
DMD
ACC
Sine
Drive
Waveshape
Startup
Logic
GND
Master
Clock
Current
Limit
TSD
OUTA
OUTB
OUTC
FG
Position
Detect
A5936-DS, Rev. 3
MCO-0000156
July 15, 2019