M63154AFP Renesas Electronics Corporation., M63154AFP Datasheet - Page 10

• Manufacturer Part Number: M63154AFP
• Description: 3-phase Brushless Motor Driver
• Manufacturer: Renesas Electronics Corporation.

M63154AFP
PWM Function Description
Chopping PWM control is applied to supply driving current to the motor in proportion to the analog-voltage input.
This IC detects the flow of current to the motor and the power supply continues to supply current until it reaches a level
specified in terms of the input voltage (current path 1). At that time, the output transistors are switched, and energy
stored in the coil regenerates current for a period determined by the internal off-timer circuit (current path 2). When the
timer reaches the specified value, the power supply again starts to supply current. Operation proceeds through repetition
of these phases.
[ FORWARD Current path timing 1.]
[ FORWARD Current path timing 2.]
Vcc
Vcc
R
RS
R
RS
RS
RS
Current path1
OUTPUT-B
OUTPUT- A
OUTPUT- B
OUTPUT- A
GND
GND
Current path 2
Current
path 1
Control value
Current
path 2
Control value
(Vcc-VRS)
Io=
Motor current
R
RS
Off time
Time
Rev.1.0, Sep.16.2003, page 10 of 15