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TEA3718 Folha de dados(PDF) 9 Page - STMicroelectronics

Nome de Peças TEA3718
Descrição Electrónicos  STEPPER MOTOR DRIVER
Download  16 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA3718 Folha de dados(HTML) 9 Page - STMicroelectronics

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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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