AA51880 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. 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 OUT1 Driver OUT2 EXP2 Timing control VIN Voltage Regulator P OT CL RT CDB VREG CST 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 AA51880 Agamem Technology Inc. PRELIMINARY SERVO MOTOR CONTROLLER PIN ASSIGNMENT 1 16 CT EXP1 2 15 POT OUT1 3 14 VIN NC 4 13 GND OUT2 5 12 GND EXP2 6 11 RDB CST 7 10 Vcc NC 8 9 AA51880 RT VREG (Top View) PIN DESCRIPTION Pin No Symbol Name & Function Timing Resistor 1 RT 2 EXP1 External PNP Transistor 1 output 3 OUT1 Output Driver 1 4 NC No Connection 5 OUT2 Output Driver 2 6 EXP2 External PNP Transistor 2 output 7 CST Stretcher capacitor 8 NC No Connection 9 VREG 10 VCC Power pin 11 RDB Error pulse output 12 GND Ground pin 13 GND Ground pin 14 VIN Input signal 15 POT Servo position voltage 16 CT Timing Capacitor Regulated Voltage output 2 2003-04-24 AA51880 Agamem Technology Inc. PRELIMINARY SERVO MOTOR CONTROLLER RATINGS (Ta=25℃, unless otherwise noted) Symbol Parameter Conditions Vcc Supply voltage Pd Power dissipation Tstg Storage temperature range Ratings Unit 9 V 300 mW — ℃ 25~125 ELECTRICAL CHARACTERISTICS (Ta=25℃ and Vcc=4.8V, unless otherwise noted) Symbol Parameter ICC Operating current VOL Output voltage"L" Test comditions Limits Min. Unit Typ. Max. When output is OFF 5 8 mA When output is ON 25 28 mA 0.1 0.2 V Load resistor 20 ohm VOH Output voltage"H" Load resistor 240 ohm 3.5 IPNP External PNP transistor drive current Load resistor 240 ohm 30 VReg IReg Regulator output voltage Regulator output current Load capacitor 0.1µF Load resistor 500 ohm 2.3 4 2.45 2.6 VOLTAGE REGULATOR OUTPUT VOLTAGE CHARACTERISTIC (Ta=25℃) 4 VReg 3 2 1 0 0 2 4 6 8 VCC 3 2003-04-24 V mA V mA AA51880 Agamem Technology Inc. PRELIMINARY SERVO MOTOR CONTROLLER APPLICATION CIRCUIT Q2 A695 10 IC1 AA51880 VCC 14 VIN C7 10U POT CT 15 16 C2 0.1U RT 1 EXP1 OUT1 OUT2 EXP2 2 R6 51Ω 3 5 6 R7 51Ω V REG 9 C8 Q1 A695 103 M VR1 5KΩ RDB CST GND GND 11 7 12 13 R1 470KΩ R3 1KΩ C3 0.1U R2 C1 0.1U 20KΩ R4 150KΩ C4 0.22U 4 C5 4.7U 2003-04-24 R7 1KΩ AA51880 Agamem Technology Inc. PRELIMINARY SERVO MOTOR CONTROLLER n SSOP PACKAGE DIMENSION PLAN 5 2003-04-24