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参数资料
| 型号： | TEA3718SP |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.5 A, PZFM15 |
| 封装： | MULTIWATT-15 |
| 文件页数： | 3/21页 |
| 文件大小： | 3436K |
| 代理商： | TEA3718SP |
The circuit is intended to drive a bipolar constant cur-
rent through one motor winding. The constant current
is generated through switch mode regulation.
There is a choice of three different current levels with
the two logic inputs lN0 and lN1. 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.
FUNCTIONAL DESCRIPTION
IN0
IN1
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
Out A through the winding to Out B.
lH0 and lH1 - The current level in the motor winding
is selected with these inputs. The values of the dif-
ferent current levels are determined by the refer-
ence voltage VR together with the value of the sens-
ing resistor 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 IN0 and IN1. 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
Rt 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 power
supplied 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.
VSS, VS, VR
The circuit will stand any order of turn-on or turn-off
the supply voltages VSS and VS. Normal dV/dt val-
ues are then assumed.
Preferably, VR should be tracking VSS during power-
on and power-off if VS is established.
ANALOG CONTROL
The current levels can be varied continuously if VR
is varied with a circuit varying the voltage on the
comparator terminal.
POWER LOSSES VS OUTPUT CURRENT
TEA3718-TEA3718S
11/16
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