Agamem Technology Inc.
PRELIMINARY
SERVO MOTOR CONTROLLER
INTRODUCTION
The AA51880 is a BJT integrated circuit for use in servo motor control applications.
The built -in voltage regulato r provides the AA51880 with e xtremely stable output voltage.
AA51880
FEATURES
Built-in voltage regulator.
Larger driving capability.
Small outline package.
APPLICATIONS
Servo motor control.
Radio controlled car, boat, airplane.
IA products (such as air-condition).
BLOCK DIAGRAM
EXP1
Output
Driver
V
IN
Timing control
Voltage
Regulator
OUT1
OUT2
EXP2
V
REG
P
OT
C
L
R
T
C
DB
C
ST
FUNCTION DESCRIPTION
Timing control block detects the motor position and adjust dead band.
Output driver circuit control the servo motor current direction.
The voltage regulator supports the application reference voltage.
1
2003-04-24
Agamem Technology Inc.
PRELIMINARY
SERVO MOTOR CONTROLLER
RATINGS
(Ta=25℃, unless otherwise noted)
Symbol
Vcc
Pd
Tstg
AA51880
Parameter
Supply voltage
Power dissipation
Storage temperature
range
Conditions
Ratings
9
300
—
Unit
V
mW
℃
25~125
ELECTRICAL CHARACTERISTICS
(Ta=25℃ and Vcc=4.8V, unless otherwise noted)
Symbol
I
CC
V
OL
V
OH
I
PNP
V
Reg
I
Reg
Parameter
Operating current
Output voltage"L"
Output voltage"H"
External PNP transistor drive current
Regulator output voltage
R
egulator output current
Test comditions
When output is OFF
When output is ON
Load resistor 20 ohm
Load resistor 240 ohm
Load resistor 240 ohm
Load capacitor 0.1µF
Load resistor 500 ohm
Limits
Min.
Typ.
5
25
0.1
3.5
30
2.3
4
2.45
2.6
Max.
8
28
0.2
Unit
mA
mA
V
V
mA
V
mA
VOLTAGE REGULATOR OUTPUT VOLTAGE CHARACTERISTIC (Ta=25℃)
4
3
V
Reg
2
1
0
0
2
4
V
CC
6
8
3
2003-04-24