點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
11-MD142
Application Notes
z
The 11-MD142 integrates saturation voltage and constant current of motor driver.
The range of supply voltage of 11-MD142, VDD and VB, is from 2.2V to 5.5V. The
11-MD142 input range is defined that logic “H” is from 0.8*VDD to VDD+0.4V and
logic “L” is from –0.4V to 0.2*VDD. EN1 and EN2 are mode selection pins; IN1,
IN2, IN3 and IN4 are motor rotation selection pins.
z
z
Normally VB should provide enough current for output loading, thus large value of
C is suggested for the terminal VB. Besides, 0.01uF~0.1uF of capacitors, Cn, are
also suggested between each output channel and output channel to ground.
Constant current operation of 11-MD142 provides the current, which can be
evaluated by the following formula (See the depiction of application circuit 1.):
VIAD
IPIM
=
(unit : A)
(unit : A)
(RPIM + 0.3)
VIAD
IIM =
(RIM + 0.11)
z
z
Before switching the mode of actuator, make sure to pull low the motor rotation
selection pins (IN1~IN4). Then, switch to next mode to drive the motor.
Considering of stability of function of constant current, compensation capacitor of
Cc (0.1~1uF) is suggested to connect between pin OUT1 and IM.
SP-MD142-A.003
Version：A.003
Page：7
SITI [ SILICON TOUCH TECHNOLOGY INC. ]
