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E-TEA3718SP View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
E-TEA3718SP Stepper motor driver ST-Microelectronics
STMicroelectronics ST-Microelectronics
E-TEA3718SP Datasheet PDF : 26 Pages
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Functional blocks
4.1
Alarm output (TEA3718SP, TEA3718DP and TEA3718SDP)
The ALARM output pin becomes low when the junction temperature reaches T ° C. When an
alarm condition occurs, parts of the supply voltage (dividing bridge R - RC) is fed to the
comparator input pin (Figure 16). Depending on the RC value the behavior of the circuit on
an alarm condition is as follows:
RC > 80 ohms, the output stage is switched off
RC > 60 ohms, the current in the motor windings is reduced according to the
approximate formula: (see also Figure 18 and Figure 19)
Im
=
-V----T---H--
RS
----V-----C---C------
R + RC
R-----C--
RS
with VTH = threshold of the comparator (VCH, VCM, VCL) R = 700 ohms (typical).
For several Multiwatt packages a common detection can be obtained as in Figure 17.
Figure 16. Alarm detection for power DIP package
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