E-TEA3718SP データシートの表示（PDF） - STMicroelectronics

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E-TEA3718SP

Stepper motor driver

STMicroelectronics 

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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