10
PWM
PWM signal input. The motor
speed is controlled by the input
PWM duty cycle setting.
VCC
8kΩ
500Ω
Pin Functions
Pin #
1
2
3
4
5
6
7
8
9
10
Pin Name
FG
COM
FR
VCC
U
W
V
VSS
FIL
PWM
Pin Description
Motor speed indication output (open drain)
Motor middle point terminal
Motor rotation direction switching
Power Supply for the IC and motor
U phase output terminal
W phase output terminal
V phase output terminal
Ground terminal
Motor position detection filter pin
PWM input signal for speed control
Figure 4: MSOP-10/DFN-10 pin assignments
Functional Description
The WT7062 generates signals to drive a 3-phase sensorless BLDC motor. High efficiency and
low-power consumption are achieved due to synchronous rectification drive type. The current carrying
order of the outputs is as follows: U phase -> V phase -> W phase.
Speed Control
The rotational speed of the motor can be controlled either through the PWM digital input
signal or by acting directly on the power supply (VCC). When the PWM signal is “High” (or
Weltrend Semiconductor, Inc.
Proprietary & Confidential
Mar. 4, 2011
Rev. 0.05
Page 4
WELTREND [ WELTREND SEMICONDUCTOR ]
