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| Agamem Microelectronics Inc. PRELIMINARY DESCRIPTION AA51882 SERVO MOTOR CONTROLLER The AA51882 is an integrated circuit to be applied on servo motor of radio controlled operation. It provides some flexible functions to tune the servo. External H-Bridge driver will be chosen for large servo motor application. FEATURES * Built-in voltage regulator. * Adjustable dead band range control by external capacitor. * Fixed pulse width setting to provide start-up power and speed control. . * Incorporates a protection circuit for "H-Bridge" driving configuration. * Small outline package - TSSOP16L. APPLICATIONS * Servo motor control. * Radio controlled car, boat, and airplane. * IA products (such as air-condition). * Remote positioning. BLOCK DIAGRAM (c)Copyright Agamem Microelectronics Inc. 1 www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY PIN DESCRIPTION AA51882 SERVO MOTOR CONTROLLER PIN NO. 1 PIN NAME VREG FUNCTION Constant output voltage of 2.5V (typical). Make connections from this pin to a potentiometer or pulse stretcher resistor. Connect the capacitor and resistor of the pulse stretcher section. Dead band setting by connecting a capacitor. Input signal, an adjustable pulse of 20ms cycle and 1.0-2.0ms pulse-width, operate with a positive pulse of peak value 3V or greater. Timing Resistor, connect a resistor that will determine the value of the constant current of this pin. A resistor of 18k will yield a current of 1.0mA. Local pulse setting, connect a capacitor that will generate a triangular wave by constant current charging. Output Driver 1 (connect to motor) 2 2 3 4 CST CDB VIN 5 RT 6 7 CT MOT1 (c)Copyright Agamem Microelectronics Inc. www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY PIN NO. 8 9 10 11 12 13 14 15 16 PIN NAME POT GND OUT1 OUT2 OUT3 OUT4 MOT2 VCC CFP AA51882 SERVO MOTOR CONTROLLER FUNCTION Servo position voltage from the potentiometer connected to the servo's drive shaft. Ground pin Connect to the (Q4) base of the external NPN transistor Connect to the (Q1) base of the external PNP transistor Connect to the (Q3) base of the external NPN transistor Connect to the (Q2) base of the external PNP transistor Output Driver 2 (connect to motor) Power supply pin Fixed driving pulse setting ABSOLUTE MAXIMUM RATINGS Ta=25 SYMBOL PARAMETER VCC IO PD TSTG Supply voltage Output current Power dissipation Storage temperature range RATINGS 3~9 70 500 40~125 UNIT V mA mW (c)Copyright Agamem Microelectronics Inc. 3 www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY ELECTRICAL CHARACTERISTICS AA51882 Ta=25, Vcc=5V SERVO MOTOR CONTROLLER SYMBOL VCC ICC VREG IREF VINH WSL WDB1 WDB2 ASTR WFP WSDP WOP VSAT PARAMETER Supply voltage Operating current Regulator output voltage Reference current High input voltage Standard local pulse width Minimum dead bandwidth Standard driving band width Pulse Stretcher gain Fixed driving pulse width Standard driving pulse width Output pulse width TEST CONDITIONS LIMITS UNIT MIN TYP MAX 3.0 5 7.5 V ----2.35 80 3.0 5 6 2.5 100 --1.5 --2.5 100 1.0 0.5 10.0 0.2 8 11 2.65 120 Vcc 1.6 1.0 6.0 --1.3 0.8 12.0 0.4 mA mA V uA V ms us us times ms ms ms V When output is OFF When output is ON Load capacitor 0.1uF RT = 18 k, Pin 5 current value Pin4 RT = 18 k, CT = 0.1 uF 1.4 CFP = 0.01uF, Not connect CDB Not connect CFP and CDB RT=18 k, RST=120 k, CST=0.1 uF CFP = 0.01uF, Not connect CDB Not connect CFP and CDB CST = 0.1 uF, RST = 120 k, Pulse width 100uS (3pin) ------0.7 0.3 8.0 --- Output pin saturation voltage ISINK = 20 mA (c)Copyright Agamem Microelectronics Inc. 4 www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY FUNCTIONAL DESCRIPTION (1) Voltage Regulator AA51882 SERVO MOTOR CONTROLLER This circuit is composed of a band gap circuit, and outputs a 2.5-volt temperature compensated reference voltage. This reference voltage is stabilized when the supply voltage is variable. (2) Sawtooth wave & One-Shot Generator Connect a capacitor to CT pin will generate a triangular wave by constant current charging. A typical value is 0.1uF. The constant current is determined by a resistor connected to RT pin. A typical capacitor of approximately 0.1uF should be connected in parallel with the resistor to increase stability. (3) Servo Position & Over-Time logic This circuitry consists of a pulse width comparator, which compares the servo position detection signal (POT pin) from the one-shot timer (CT pin) whose period depends on the resistance of a potentiometer connected to the servo's drive shaft. This feedback provides the stability for the control circuitry. (4) Pulse Stretcher The difference between the servo control signal and the feedback signal is the error signal. This error signal is used to toggle the direction of the current flows through the servo. The function of this pulse stretcher is to "stretch" the small error signal long enough and increases the duty cycle to the motor for it can maintain sufficient holding force. The circuit also implements a "dead band" function that prevents servo jitter and hunting. This is a range over which differences between the input and reference signals will not cause servo operation. When the signal differences exceed this "dead band" range, the servo will start to shift. The dead band will change according to the value of capacitor connected to the CDB pin. (5) Directional Logic Control The comparator circuit compares pulses from the servo control input (VIN pin) and the voltage controlled pulse generator. It provides either a positive or a negative output depending on whether the signal pulse width is larger or smaller than the position generator's output pulse (POT pin). Application of this error voltage to the motor driver circuit causes the motor to turn in a direction that will minimize the error until both pulse widths are the same. (6) PWM Control This signal generated by directional logic control block is used to control a flip-flop that toggles the direction the current flows through the motor. The outputs of the flip-flop drive an external H-Bridge output driver that handles the high current going through the motor. This output of this block will be turned on or off with each input pulse based on the status of the directional logic. The PWM drive techniques provide the benefits of reduced power dissipation, improved servo motor performance and positively affect system efficiency. (c)Copyright Agamem Microelectronics Inc. 5 www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY (7) Output driver AA51882 SERVO MOTOR CONTROLLER The output driver controls the servo current direction. For heavy load application, the OUT2 and OUT4 pin will be connected to the base of the external PNP transistors and the OUT1and OUT3 pin will be connected to the base of the external NPN transistors. MOT1 and MOT2 pins are connected to PIN1 by 18k resistor internally. They can be connected to both side of servo to get the better performance when servo is to be stopped. TYPICAL APPLICATION EXAMPLE A. H-Bridge TRANSISTOR Driver (c)Copyright Agamem Microelectronics Inc. 6 www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY B. H-Bridge MOSFET Driver C9 0.01uF VS 16 CFP 15 VCC OUT4 13 MOT1 7 OUT2 11 VIN 4 MOT2 14 OUT3 12 OUT1 10 RT 5 CT 6 POT 8 CDB CST GND VREG 1 3 2 9 R9 1M AA51882 SERVO MOTOR CONTROLLER VS C8 103pF Q1 Q2 M VR1 Q3 5K R7 1K Q4 RX 1K R1 470K R2 18K C3 0.1uF C1 0.1uF C10 C2 0.001uF 0.1uF R4 150K C4 0.22uF C5 4.7uF * When the servo is about to reach the target position, the servo maybe overshoot for speed issue. There are two ways to suppress such dispensable action. If MOT1 and MOT2 pins are connected to both side of servo (R9 is no need), you can try to reduce the value of R1 to let servo make an instant stop on the target position. If MOT1 and MOT2 are floating for PCB layout issue, R9 can be plugged and tuned to get the same efforts described before. The application circuit is for reference only. The value of resistor and capacitor needs to be changed and gets the best performance in various servos. Please select low threshold voltage (Vt) MOSFET driver for the maximum driving capacity. If Vt is higher, you should provide higher power supply voltage in order to turn on the MOSFET fully. ORDERING INFORMATION ORDER NO. AA51882A PACKAGE TSSOP 16L PACKING TAPE & REEL 7 Q'TY 2,500ea MARK CHART AA51882 XXXX A (c)Copyright Agamem Microelectronics Inc. www.agamem.com.tw 2008/5/5 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 Microelectronics Inc. PRELIMINARY PACKAGE DIMENSIONS AA51882 SERVO MOTOR CONTROLLER NOTES ON USE * The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. * The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. * Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. (c)Copyright Agamem Microelectronics Inc. 8 www.agamem.com.tw 2008/5/5 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. |
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