L6515
DUAL DC-MOTOR POSITIONING SYSTEM
ADVANCE DATA
PRECISE OPERATION ALSO WITH LOW COST OPTICAL ENCODER
PWM -OUTPUT FOR DIGITAL SWITCHED POWER BRIDGES
DIRECTION INDICATOR FOR EASY POSI-TION COUNTING WITH µP
EXTERNAL LOOP GAIN AND TRANSFER FUNCTIONAL ADJUSTMENT PARALLEL ADDRESSED
INPUTS
WITH
LATCH
44LEAD PLCC PACKAGE
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DESCRIPTION
The L6515is a monolithic integrated circuit in BCD-Technology assembled in a PLCC-44plastic chip carrier.
The device contains all functions for a complete dual DC-Motor positioning system.For the motor driver stage only digital switched bridges are needed.
Useful are L293E,L298,L6203and L6202.The device is intended to drive DC-Motors in typewrit-ers,printers,plotters and general purpose indus-trial applications.
This is advanced information on a new product now in development or unde rgoing evaluation.Details are subject to change without notice.
May 1994SYSTEM BLOCK DIAGRAM (ONE CHANNEL)
PLCC44
ORDERING NUMBER:L6515
MULTIPOWER BCD TECHNOLOGY
梦然
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丫蛋老公SYSTEM DESCRIPTION
The L6515is intended to be used as a microproc-essor controlled positioning system.
For the motor driver stage only digital operating bridges are needed like L293E,L298,L6203,L6202.The system operates in two modes to achieve high-speed,high-accurancy positioning.
Speed commands for the system originate in the microprocessor.It is continuously updated on the motor position by means of pulses from the con-troller chip,which in turn gets its information from the encoder.From this basic input,the microproc-essor computes a 6-bit control word that sets the system speed and direction dependent on the dis-tance to travel.
When the motor is stopped and the microproces-sor orders it to a new position,the system oper-ates initially in an open-loop configuration as there is no feedback from the tachometer gener-ator.Therefore maximum current is fed to the mo-tor.As maximum speed is reached,the tachome-ter chip output backs off the processors signal thus reducing accelerating torque.The motor con-tinues to run at top speed but under closed-loop control.
As a target position is approached,the microproc-essor lowers the value of the speed-demand word;this reduces the voltage at the main sum-ming point,in effect braking the motor.The brak-ing is applied progressively until the motor is run-ning at minimum speed.
At that time,the microprocessor orders a switch to the position mode,and within 3to 4ms the power stage drives the motor to a null position,where it is held by electronic ”detening”.
Symbol Parameter
Value Unit V S Supply Voltage 12V V IA Analog Inputs Voltage -0.3to 7V V IL Logic Inputs Voltage
-0.3to 7V V O Open Collector Output Current 12V I O Open Collector Current 10mA I Z Zener Current 20mA T stg ,Tj Storage Temperature
-40to 150°C T amb
Operative Ambient Temperature
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°C
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION (top view)
L A I
L6515
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L6515 PIN FUNCTIONS
Pin Name Description
1LCSG Load Current Decoder Sens Reference Ground
2V Z Zener Clamp
3,43LCDI Load Current Decoder Input
4,42LCDO Load Current Decoder Output
5,41EAO Error Amplifier Output for Current Mode PWM Modulator
6,40EAI Error Amplifier Input for Current Mode PWM Modulator
7,39TSO Tacho Signal Output
8,38TSPO Tacho Signal Processor Output
9,37TSPI Tacho Signal Processor Input
10,36PWMN Current Mode PWM Output Inverted
11,35PWM Current Mode PWM Output non Inverted
12,34DIO Direction Indicator Digital Open Collector Output.A Low Level is cw,
A High Level is ccw Operation of the Motor
13,33PCO Position Counter Digital Open Collector Output
14,32PSO Phase Selector Output for Signal Differentation
15,31POSO Positioning Output.The Output Becomes Activated via Position
Adress Decoder.
16,30FTB Analog Input from Position Encoder Phase B.Proposed Operation
Range is2.8V+1V.
17,29FTA Analog Input from Position Encoder Phase A.Proposed Operation
Range is2.8V+1V
18REF Master Current Reference
19OSC Oscillator
20,21DAI Decoder Logic Input for Latch Select+Reset
22GND Major and Logic Ground
23to28LAI Latch Adress Input
44V S Supply Voltage
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L6515
SCHEMATIC DIAGRAM 4/13
L6515 APPLICATION CIRCUIT
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Symbol Parameter
Pin
Test Condition
Min.Typ.
Max.Unit V S Operating Supply Voltage Range 7
11V I S Quiescent supply current 50mA V Z Zener Voltage
angelababy权志龙I z =1mA
8,59.9
11,4
V I Z
Operating Zener Current
1
mA
ELECTRICAL CHARACTERISTICS (refer to test circuit,V S =10V,I REF =300µA,T amb =25°C unless otherwise specified)
V I Operating Input Voltage Range A/D/1/2
referred to V REF
-1,65
+1,65V I I Input Bias Current
1µA V OS
INput-output Offset Voltage Between A/D/1/2and F/1/2
S3or S4closed I o =0±15
mV
S1or S2closed I o =0V IN =V REF
±20mV
V SAT Output Saturation Voltage B/C/1/2
I o =1.4mA
0.4V I OH Output Leakage Current 10µA V TH
Threshold Hysteresis voltage Between A/1/2and B/1/2D/1/2and C/1/2
80
150
mV
R ON Output Resistance ON State E/F/1/2One of S1to S6closed 150300ΩV OL
Output Operating Low Voltage
E/F/1/2
referred to V REF I O =1mA
-1.2
V
柏拉图的永恒V OH OutpUt Operating High Voltage +1.2V
POSITION ENCODER SECTION
L6515
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