參數(shù)資料
型號(hào)： TLE7368G
廠商： INFINEON TECHNOLOGIES AG
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36
封裝： PLASTIC, SOP-36
文件頁(yè)數(shù)： 22/39頁(yè)
文件大?。?/td> 932K
代理商： TLE7368G
Data Sheet
29
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
5.9
Monitoring Circuit
The monitoring block within the TLE7368 detects an undervoltage at the stand-by regulator output and is able to
distinguish between two different undervoltage situations. When the stand-by output gets back into regulation after
an undervoltage event, the timing on the MON_STBY output signal indicates the kind of undervoltage scenario
which has happened before. The behavior of the monitoring block is also described in Figure 6 and Figure 7
below.
In case of an undervoltage at the stand-by regulator with the 5 V regulator LDO1 in regulation (which means that
RO_1 = HIGH) the monitoring circuit has basically a power fail functionality which means that the MON_STBY
output will be LOW just as long as the undervoltage at the stand-by output occurs. As soon as Q_STBY is coming
back into regulation MON_STBY turns high again.
When the 5 V regulator is out of regulation (RO_1 = LOW), e.g. in case of EN_uC = EN_IGN = LOW, the
MON_STBY will turn LOW again if an undervoltage event happens at Q_STBY. The difference to the scenario
described above is now that when Q_STBY gets back into regulation the toggling of the MON_STBY output to
HIGH is coupled with the 5 V Reset line, RO_1, turning HIGH. In detail, the MON_STBY line turns high delayed
by
t
MON_STBY after the Reset line RO_1 had gone high.
Figure 6
Stand by Monitor State Diagram
MON = High
V
Q_STBY < VMON, Q_STBY, de
and
RO_1 = High
Monitor timing
= don’t care
MON = Low
Monitor timing
= no delay *)
MON = Low
Monitor timing
= delay**)
*) power fail functionionality
**) power on reset functionality
V
Q_STBY > VMON, Q_STBY, in
and
RO_1 = High
V
Q_STBY < VMON, Q_STBY, de
and
RO_1 = Low
V
Q_STBY > VMON, Q_STBY, in
and
RO_1 = High
V
Q_STBY < VMON, Q_STBY, de
and
RO_1 = Low
V
Q_STBY > VMON, Q_STBY, in
and
RO_1 = Low
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