Agamem AA51883A Servo motor controller Datasheet

AA51883
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
■ APPLICATIONS
• Servo motor control.
• Radio controlled car, boat, and airplane.
• IA products (such as air-condition).
• Remote positioning.
■ BLOCK DIAGRAM
VIN
VCC
2
3
1
Directional
Logic
Control
8
CFP
PWM
Control
Output
Driver
EXP1
16 OUT1
13 OUT2
12
Servo
Position &
Over-Time
Logic
Sawtooth Wave
& One Shot
Generator
Pulse
Stretcher
Voltage
Regulator
9
10
11
7
6
15
RT
CT
POT
CDB
CST
GND
©Copyright Agamem Microelectronics Inc.
1
EXP2
5 VREG
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.
AA51883
Agamem Microelectronics Inc.
PRELIMINARY
SERVO MOTOR CONTROLLER
■ PIN DESCRIPTION
EXP1
CFP
VCC
N.C.
VREG
1
2
3
4
5
CST
CDB
VIN
6
7
8
○
16
15
OUT1
GND
14
13
12
N.C.
OUT2
11
10
9
POT
CT
EXP2
RT
TOP VIEW
PIN NO.
PIN NAME
PIN FUNCTION
1
EXP1
Connect to the (Q1) base of the external PNP transistor
2
CFP
Fixed driving pulse setting
3
VCC
Power supply pin
5
VREG
Constant output voltage of 2.5V (typical). Make connections
from this pin to a potentiometer or pulse stretcher resistor.
6
CST
Connect the capacitor and resistor of the pulse stretcher
section.
7
CDB
Dead band setting by connecting a capacitor.
8
VIN
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.
9
RT
Timing Resistor, connect a resistor that will determine the
value of the constant current of this pin. A resistor of 18kΩ
will yield a current of 1.0mA.
10
CT
Local pulse setting, connect a capacitor that will generate a
triangular wave by constant current charging.
11
POT
Servo position voltage from the potentiometer connected to
the servo's drive shaft.
12
EXP2
Connect to the (Q2) base of the external PNP transistor
13
OUT2
Output Driver 2 (connect to motor)
15
GND
Ground pin
16
OUT1
Output Driver 1 (connect to motor)
©Copyright Agamem Microelectronics Inc.
2
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.
AA51883
Agamem Microelectronics Inc.
PRELIMINARY
SERVO MOTOR CONTROLLER
■ ABSOLUTE MAXIMUM RATINGS
℃
Ta=25
SYMBOL
PARAMETER
RATINGS
UNIT
Vcc
Supply voltage
9
V
IO
Output current
50
mA
Pd
Power dissipation
500
mW
—40~125
℃
Tstg
Storage temperature range
■ ELECTRICAL CHARACTERISTICS
℃ and Vcc=5V
Ta=25
Vcc
Supply voltage
ICC
Operating current
When output is OFF
When output is ON
LIMITS
UNIT
MIN TYP MAX
3.0
5
7.5
V
--5
8
mA
--6
11
mA
VREG
Regulator output
voltage
Load capacitor 0.1uF
2.35
2.5
2.65
V
80
100
120
uA
3.0
---
Vcc
V
1.4
1.5
1.6
ms
---
---
1.0
us
---
2.5
6.0
us
---
100
---
times
0.7
1.0
1.3
ms
0.3
0.5
0.8
ms
8.0
10.0
12.0
ms
---
0.2
0.4
V
SYMBOL
IREF
VinH
W SL
W db1
W db2
ASTR
W FP
W SDP
Wop
Vsat
PARAMETER
CONDITIONS
RT = 18 kΩ, Pin 5 current
value
High input voltage Pin4
Standard local
RT = 18 kΩ, 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 kΩ, RST=120 kΩ,
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 kΩ, Pulse width 100uS
(3pin)
Output pin
I
= 20 mA
saturation voltage SINK
Reference current
©Copyright Agamem Microelectronics Inc.
3
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.
AA51883
Agamem Microelectronics Inc.
PRELIMINARY
SERVO MOTOR CONTROLLER
■ APPLICATION CIRCUIT
C9
0.01uF
2
3
CFP
VCC
EXP1 1
VS
OUT1 16
Q2
EXP2 12
VIN 8
AA51883
Q1
C8 103pF
M VR1
OUT2 13
5K
Ω
Ω
R7
1K
RX 1KΩ
RT
CT
POT
CDB
9
10
11
7
CST GND VREG 5
6
15
R1
470K
Ω
R2
18K
C3
0.1uF
C2
C1
0.1uF
0.1uF
C10
0.001uF
R4 150K
C4
0.22uF
Ω
Ω
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.
©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.
AA51883
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
©Copyright Agamem Microelectronics Inc.
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.
AA51883
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.
■ ORDERING INFORMATION
ORDER NO.
PACKAGE
PACKING
Q’TY
AA51883A
TSSOP 16L
TAPE & REEL
2,500ea
©Copyright Agamem Microelectronics Inc.
6
MARK CHART
AA51883
XXXX
A
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.
AA51883
Agamem Microelectronics Inc.
PRELIMINARY
SERVO MOTOR CONTROLLER
■PACKAGE DIMENSIONS
TSSOP 16L
E1
E
L
C
12°(4X)
A1
A
A2
theta
D
SYMBOLS
A
A1
A2
b
C
D
E
E1
e
L
y
theta
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°
e
b
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 PROTRUSIONSOR GATE BURRS
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
©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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