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L6374 数据表(PDF) 8 Page - STMicroelectronics

部件名 L6374
功能描述  Industrial quad line driver
Download  19 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6374 数据表(HTML) 8 Page - STMicroelectronics

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Overtemperature protection (OVT)
L6374
8/19
5
Overtemperature protection (OVT)
If the chip temperature exceeds Th (measured in a central position in the chip) the chip
deactivates itself.
The following actions are taken:
all the output stages are forced in the "three state" condition, i.e. are disconnected from
the output pins; only the clamping diodes at the outputs remain active;
the signal Diag is activated (active low).
Normal operation is resumed as soon as (typically after some seconds) the chip
temperature monitored goes back below Th -HT.
The different upper and lower thresholds with hysteretic behavior, assure that no intermittent
conditions can be generated.
6
Undervoltage protection (UV)
The supply voltage is expected to range from 11 V to 35 V, even if its reference value is
considered to be 24 V.
In this range the L6374 operates correctly. Below 10.8 V the overall system has to be
considered not reliable.
Consequently the supply voltage is monitored continuously and a signal, called UV, is
internally generated and used.
The signal is "on" as long as the supply voltage does not reach the upper internal threshold
of the Vs comparator (called Vsh). The UV signal disappears above Vsh.
Once the UV signal has been removed, the supply voltage must decrease below the lower
threshold (i.e. below Vsh -Hys1) before it is turned on again.
The hysteresis Hys1 is provided to prevent intermittent operation of the device at low supply
voltages that may have a superimposed ripple around the average value.
The UV signal inhibits the outputs, putting them in three-state, but has no effect on the
creation of the reference voltages for the internal comparators, nor on the continuous
operation of the charge-pump circuits.


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