Datenblatt-Suchmaschine für elektronische Bauteile |
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TEA3718S Datenblatt(PDF) 9 Page - STMicroelectronics |
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TEA3718S Datenblatt(HTML) 9 Page - STMicroelectronics |
9 / 16 page ALARM OUTPUTS (TEA3718SP - TEA3718DP) The alarm output becomes low when the junc- tion temperature reaches T °C. When an alarm condition occours, parts of the supply voltage (dividing bridge R - RC) is fed to the comparator input pin (Fig. A) Depending of the RCC value the behaviour of the circuit is different on alarm condition: 1) RC >80 Ω ⇒ the output stage is switched off 2) RC >60 Ω ⇒ the current in the motor windings is reduced according to the approximate formula: (see also fig. E and F) with VTH = Threshold of the comparator (VCH, VCM,VCL) R = 700 Ω (typical) For several Multiwatt packages a common de- tection can be obtained as in Fig. D PRE-ALARM OUTPUT When the junction temperature reaches T1 °C (typ. = 170 °C) a prealarm signal is generated. Soft thermal protection occours when function temperature reaches T2 (T2 > T1) Im = VTH RS − VCC R + RC • RC RS Figure C: Alarm Detection for Powerdip Package Figure D: CommonDetection for Several Multiwatt Package TEA3718-TEA3718S 9/16 |
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