AA51880
Agamem Microelectronics Inc.
SERVO MOTOR CONTROLLER
PRELIMINARY
PWM drive techniques provide the benefits of reduced power dissipation, improved servo
motor performance and positively affect system efficiency.
(7) Output driver
The output driver controls the servo current direction. For light load application, the servo can
be connected with OUT1 and OUT2 pin only. For heavy load application, the EXP1 and EXP2
pin will be connected to the base of the external PNP transistor. It drives in an H-bridge
configuration (The sink NPN drivers are built inside the chip).
■ TYPICAL APPLICATION EXAMPLE
A. Mini-Servo Application (No external drivers needed)
VCC
10
C8 103pF
2
EXP1
OUT1
OUT2
3
5
VR1
5KΩ
VIN 14
EXP2
6
9
VREG
R7
1KΩ
RT
1
CT
16
POT
15
RDB
11
CST
7
GND GND GND
R1
470KΩ
4
12 13
R3
1KΩ
R2
20KΩ
R4 150KΩ
C3
0.1uF
C2
0.1uF
C1
0.1uF
C4
0.22uF
C5
4.7uF
5
©Copyright Agamem Microelectronics Inc.
www.agamem.com.tw
2008/4/22
AGAMEM MICROELECTRONICS INCOPERATION RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE
TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. AGAMEM DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCTS OR CIRCUIT DESRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
AGAMEM [ AGAMEM MICROELECTRONIC INC. ]
