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NCV7728DPAR2G 数据表(PDF) 21 Page - ON Semiconductor

部件名 NCV7728DPAR2G
功能描述  Hex Half-Bridge Driver
PDF  27 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

NCV7728DPAR2G 数据表(HTML) 21 Page - ON Semiconductor

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21
Over Voltage Shutdown
Over voltage shutdown circuitry monitors the voltage on
the VS1 and VS2 pins, which permits a 40 V maximum.
When the Over−voltage Threshold level has been breached
on the VS1or VS2 supply input, the output bit 14 (PSF) will
be set. Additionally, if the input bit 0 (OVLO) is asserted, all
outputs will turn off. During an Over Voltage Lockout
condition the turn on/off status is maintained in the logic
circuitry.
When
proper
input
voltage
levels
are
re−established, the programmed outputs will turn back on.
Over−voltage shutdown can be disabled by using the SPI
input bit 0 (OVLO = 0) to run through a load dump situation.
It is highly recommended to operate the part with OVLO bit
asserted to ensure that the drivers remain off during a load
dump scenario.
The table below describes the driver status when
enabling/disabling the over voltage lock out feature during
normal and overvoltage situations.
Table 3. OVER−VOLTAGE LOCK OUT (OVLO)
OVLO Input
Bit
VSx OVLO
Condition
Output Data Bit 14 Power Supply Fail (PSF) Status
OUTx Status
0
0
‘0’
Not in Overvoltage Outputs Unchanged
0
1
‘1’
(Clears when VSx within Operating Range)
In Overvoltage
³ Outputs Unchanged
1
0
‘0’
Not in Overvoltage Outputs Unchanged
1
1
‘1’
(Clears when VSx within Operating Range)
All Outputs Off (Remain off until VSx is out
of OVLO)
Over−voltage timing diagram is provided in Figure 22.
Figure 22. Over−Voltage Timing Diagram
?
?
OUTx
ON
PSF
ALL
Z
VSx
VSOV
PSF
No
Fault
No
Fault
t
SI
Status
Output
State
SO
OUTx ON
OVLO=0
X
OUTx
ON
No
Fault
No
Fault
OUTx
ON
OUTx ON
OVLO=1
No
Fault
VSOV
PSF
PSF
OUTx
ON
OUTx
ON
No
Fault
OUTx
OFF
No
Fault
OUTx Z



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