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参数资料
| 型号： | TEA3717DP |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1 A, PDIP16 |
| 封装： | POWER, DIP-16 |
| 文件页数： | 4/8页 |
| 文件大小： | 518K |
| 代理商： | TEA3717DP |
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FUNCTIONAL DESCRIPTION
The circuit is intented to drive a bipolar constant cur-
rent through one motor winding. The constant cur-
rent is generated through switch mode regulation.
There is a choice of three different current levels with
the two logic inputs l0 and l1. The current can also
be switched off completely.
INPUT LOGIC
If any of the logic inputs is left open, the circuit will
treat it as a high level input.
I0
I1
Current Level
H
L
H
L
H
L
No Current
Low Current
Medium Current
Maximum Current
PHASE
This input determines the direction of cur-
rent flow in the winding, depending on the motor
connections. The signal is fed through a Schmidt-
trigger for noise immunity, and through a time delay
in order to guarantee that no short-circuit occurs in
the output stage during phase-shift. High level on
the PHASE-input causes the motor current flow
from MA through the winding to MB.
l0 and l1
The current level in the motor winding is
selected with these inputs. The values of the differ-
ent current levels are determined by the reference
voltage VR together with the value of the sensing re-
sistor RS.
CURRENT SENSOR
This part contains a current sensing resistor (RS), a
low pass filter (RC, CC) and three comparators. Only
one comparator is active at a time. It is activated by
the input logic according to the current level chosen
with signals l0 and l1. The motor current flows
through the sensing resistor RS. When the current
has increased so that the voltage across RS be-
comes higher than the reference voltage on the
other comparator input, the comparator output goes
high, which triggers the pulse generator and its out-
put goes high during a fixed pulse time (toff), thus
switching off the power feed to the motor winding,
and causing the motor current to decrease during
toff.
SINGLE-PULSE GENERATOR
The pulse generator is a monostable triggered on
the positive going edge of the comparator output.
The monostable output is high during the pulse time,
toff, which is determined by the timing components
Rt and Ct.
toff = 0.69
R t Ct
The single pulse switches off the power feed to the
motor winding, causing the winding current to de-
crease during toff.
If a new trigger signal should occur during toff, it is
ignored.
OUTPUT STAGE
The output stage contains four Darlington transis-
tors and four diodes, connected in an H-bridge. The
two sinking transistors are used to switch the pow-
ersupplied to the motor winding, thus driving a con-
stant current through the winding.
It should be noted however, that it is not permitted
to short circuit the outputs.
VCC, Vmm, VR
The circuit will stand any order of turn-on or turn-off
of the supply voltages VSS and VS. Normal dV/dt
values are then assumed.
Preferably, VR should be tracking VCC during power-
on and power-off.
ANALOG CONTROL
The current levels can be varied continuously either
if VR is varied or with a circuit varying the voltage fed
into the comparator terminal (see fig.1).
Note : RS = 1
, inductance free
RC = 1 k
CC = 820 pF, ceramic
Rt = 56 k
TEA3717
4/8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TEA3717DP | 制造商:STMicroelectronics 功能描述:Motor Driver IC |
| TEA3718 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:STEPPER MOTOR DRIVER |
| TEA3718_09 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Stepper motor driver |
| TEA3718DP | 功能描述:马达/运动/点火控制器和驱动器 Stepper Motor RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TEA3718S | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:STEPPER MOTOR DRIVER |
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