L6515 데이터 시트보기 (PDF) - STMicroelectronics
부품명
상세내역
제조사
L6515 Datasheet PDF : 13 Pages
| |||
L6515
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
VIA
VIL
VO
IO
IZ
Tstg, Tj
Tamb
Parameter
Supply Voltage
Analog Inputs Voltage
Logic Inputs Voltage
Open Collector Output Current
Open Collector Current
Zener Current
Storage Temperature
Operative Ambient Temperature
PIN CONNECTION (top view)
Value
Unit
12
V
-0.3 to 7
V
-0.3 to 7
V
12
V
10
mA
20
mA
-40 to 150
°C
0 to 70
°C
SYSTEM DESCRIPTION
The L6515 is 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-
2/13
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 3 to 4ms the
power stage drives the motor to a null position,
where it is held by electronic ”detening”.
Share Link: 