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E-TEA3718SP View Datasheet(PDF) - STMicroelectronics

Part Name
Description
View to exact match
E-TEA3718SP
STMICROELECTRONICS
STMicroelectronics STMICROELECTRONICS
E-TEA3718SP Datasheet PDF : 26 Pages
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Functional description
5.4
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 decrease during toff. If a new trigger signal should occur during toff, it is ignored.
5.5
Note:
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.
5.6
VSS, VS and VR
The circuit stands any order of turn-on or turn-off the supply voltages VSS and VS. Normal
dV/dt values are then assumed.
Preferably, VR should track VSS during power on and power off if VS is established.
5.7
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
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