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Agamem Microelectronics Inc. PRELIMINARY SERVO MOTOR CONTROLLER
DESCRIPTION The AA51883 is an integrated circuit to be applied on servo motor of radio controlled operation. It provides some flexible functions to tune the servo. External PNP driver will be chosen for servo motor application. FEATURES * Internal output NPN power transistor. * 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
AA51883
APPLICATIONS * Servo motor control. * Radio controlled car, boat, and airplane. * IA products (such as air-condition). * Remote positioning. BLOCK DIAGRAM
CFP 2 VCC 3
VIN
8
Directional Logic Control
1
EXP1
PWM Control
Output Driver
16 OUT1 13 OUT2 12 EXP2
Sawtooth Wave & One Shot Generator
Servo Position & Over-Time Logic
Pulse Stretcher
Voltage Regulator
5 VREG
9 RT
10 CT
11 POT
7 CDB
6 CST
15 GND
(c)Copyright Agamem Microelectronics Inc.
1
www.agamem.com.tw
2008/4/9
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 SERVO MOTOR CONTROLLER
PIN DESCRIPTION
AA51883
EXP1 CFP VCC N.C. VREG CST CDB VIN
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
OUT1 GND N.C. OUT2 EXP2 POT CT RT
TOP VIEW
PIN NO. 1 2 3 5 6 7 8 PIN NAME EXP1 CFP VCC VREG CST CDB VIN PIN FUNCTION Connect to the (Q1) base of the external PNP transistor Fixed driving pulse setting Power supply pin 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. Servo position voltage from the potentiometer connected to the servo's drive shaft. Connect to the (Q2) base of the external PNP transistor Output Driver 2 (connect to motor) Ground pin Output Driver 1 (connect to motor) 2
www.agamem.com.tw 2008/4/9
9 10 11 12 13 15 16
RT CT POT EXP2 OUT2 GND OUT1
(c)Copyright Agamem Microelectronics Inc.
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 SERVO MOTOR CONTROLLER
ABSOLUTE MAXIMUM RATINGS
Ta=25
AA51883
SYMBOL Vcc IO Pd Tstg
PARAMETER Supply voltage Output current Power dissipation Storage temperature range
RATINGS 9 50 500 --40~125
UNIT V mA mW
ELECTRICAL CHARACTERISTICS
Ta=25 and Vcc=5V
SYMBOL Vcc ICC VREG IREF VinH W SL W db1 W db2 ASTR W FP W SDP Wop Vsat
PARAMETER Supply voltage Operating current Regulator output voltage Reference current
CONDITIONS
When output is OFF When output is ON Load capacitor 0.1uF
LIMITS UNIT MIN TYP MAX 3.0 5 7.5 V --5 8 mA --6 11 mA 2.35 80 3.0 1.4 ------0.7 0.3 8.0 --2.5 100 --1.5 --2.5 100 1.0 0.5 10.0 0.2 2.65 120 Vcc 1.6 1.0 6.0 --1.3 0.8 12.0 0.4 V uA V ms us us times ms ms ms V
RT = 18 k , Pin 5 current value High input voltage Pin4 Standard local RT = 18 k , CT = 0.1 uF pulse width Minimum dead CFP = 0.01uF, Not connect bandwidth CDB Standard driving Not connect CFP and CDB band width Pulse Stretcher RT=18 k , RST=120 k , gain CST=0.1 uF Fixed driving pulse CFP = 0.01uF, Not connect width CDB Standard driving Not connect CFP and CDB pulse width CST = 0.1 uF, RST = 120 Output pulse width k , Pulse width 100uS (3pin) Output pin I = 20 mA saturation voltage SINK 3
(c)Copyright Agamem Microelectronics Inc.
www.agamem.com.tw
2008/4/9
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 SERVO MOTOR CONTROLLER
APPLICATION CIRCUIT
AA51883
C9 0.01uF
2 CFP
3 VCC EXP1 1 OUT1 16 Q2 EXP2 12 VS C8 103pF Q1
VIN 8
AA51883
OUT2 13
M VR1
5K R7 1K
RX 1K RT 9 CT 10 POT 11 CDB 7 CST GND VREG 5 6 15
R1 470K
R2 18K
C3 0.1uF
C2 C1 0.1uF
0.1uF
C10 0.001uF
R4 150K C4 0.22uF C5 4.7uF
Half H-Bridge application using two external PNPs When the servo is about to reach the target position, the servo maybe overshoot for speed issue. OUT1 and OUT2 pins are connected to both side of servo, you can try to reduce the value of R1 to let servo make an instant stop on the target position. 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.
(c)Copyright Agamem Microelectronics Inc.
4
www.agamem.com.tw
2008/4/9
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 SERVO MOTOR CONTROLLER
FUNCTIONAL DESCRIPTION (1) Voltage Regulator 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) Saw tooth 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
(c)Copyright Agamem Microelectronics Inc.
AA51883
5
www.agamem.com.tw
2008/4/9
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 SERVO MOTOR CONTROLLER
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. (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). 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. * Take account of common impedance when designing the earth line on a printed wiring board.
AA51883
ORDERING INFORMATION ORDER NO. AA51883A PACKAGE TSSOP 16L PACKING TAPE & REEL Q'TY 2,500ea MARK CHART
AA51883 XXXX A
(c)Copyright Agamem Microelectronics Inc.
6
www.agamem.com.tw
2008/4/9
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 SERVO MOTOR CONTROLLER
PACKAGE DIMENSIONS
AA51883
TSSOP 16L
C
L
E1
E
theta
12(4X)
A A2
D
DIMENSIONS IN MILLIMETERS MIN NOM MAX --0.05 0.80 0.19 0.09 4.90 6.20 4.30 --0.45 --0 ----1.00 ----5.00 6.40 4.40 0.65 0.60 ----1.20 0.15 1.05 0.30 0.20 5.10 6.60 4.50 --0.75 0.10 8
A1
e
b
SYMBOLS A A1 A2 b C D E E1 e L y theta
DIMENSIONS IN INCHES MIN NOM MAX --0.002 0.031 0.007 0.004 0.193 0.244 0.169 --0.018 --0 ----0.039 ----0.197 0.252 0.173 0.026 0.024 ----0.048 0.006 0.041 0.012 0.008 0.201 0.260 0.177 --0.030 0.004 8
NOTE 1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH PROTRUSIONS R GATE BURRS O 2. TOLERANCE +/- 0.1 mm UNLESS OTHERWISE SPECIFIED 3. COPLANARITY : 0.1 mm 4. CONTROLLING DIMENSION IS MILLIMETER CONVERTEDINCH DIMENSIONS ARE . NOT NECESSARILY EXACT . 5. FOLLOWED FROM JEDEC MO -153
(c)Copyright Agamem Microelectronics Inc.
7
www.agamem.com.tw
2008/4/9
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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