TEA3718SFP STMicroelectronics, TEA3718SFP Datasheet - Page 18

• Manufacturer Part Number: TEA3718SFP
• Description: IC STEPPER MOTOR DRIVER 20-SOIC
• Manufacturer: STMicroelectronics
• Type: Stepper Motor Controller/Driverr

Specifications of TEA3718SFP

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: ±1.5A
• Voltage - Load: 10 V ~ 45 V
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 50 V
• Supply Current: 25 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional description
5.4
5.5
Note:
5.6
5.7
18/26
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, t
timing components R
The single pulse switches off the power feed to the motor winding, causing the winding
current to decrease during t
Output stage
The output stage contains four Darlington transistors 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 constant current through the winding.
It is not permitted to short circuit the outputs.
V
The circuit stands any order of turn-on or turn-off the supply voltages V
dV/dt values are then assumed.
Preferably, V
Analog control
The current levels can be varied continuously if VR is varied with a circuit varying the voltage
on the comparator terminal.
Figure 21. Power losses against output current
SS
, V
S
and V
R
should track V
R
T
and C
off
SS
T
. If a new trigger signal should occur during t
. toff = 0.69 ⋅ R
during power on and power off if V
T
C
T
off
, which is determined by the
S
is established.
SS
and V
off
, it is ignored.
S
. Normal