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L99MH98 датащи(PDF) 40 Page - STMicroelectronics

номер детали L99MH98
подробное описание детали  Automotive octal half-bridge pre-driver
PDF  147 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99MH98 датащи(HTML) 40 Page - STMicroelectronics

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Configuration
IPU HB1
IPU HB2
IPD HB1
IPD HB2
VDS_LS1
VDS_LS2
VDS_HS1
VDS_HS2
2
ON
OFF
OFF
ON
HIGH
HIGH
LOW
LOW
3
OFF
ON
ON
OFF
HIGH
HIGH
LOW
LOW
5.4.5
Short circuit to GND
A short circuit between SH1 and GND results in VDS_HS1 = HIGH and VDS_LS1 = LOW even if Ishx_PU are
activated. SH2 is pulled down by the short circuit via the motor winding, so VDS_HS2 = HIGH and VDS_LS2 =
LOW.
Similarly, a short circuit of SH2 to GND results in VDS_HS1/2 = HIGH and VDS_LS1/2 = LOW, independently
from the state of Ishx_PU.
The Figure 25 and Table 28 summarize the results obtained with a short circuit of one output to GND.
Figure 25. Short circuit to GND
+
-
VDS_HSx_DIAG
+
-
VDS_LSx_DIAG
VDH
GND
VSHx_OL
IPD
IPU
IPD
IPU
SH1
SH2
GND
GND
VSHx_OL
M
+
-
VDS_HSx_DIAG
+
-
VDS_LSx_DIAG
GH1
GL1
GH2
GL2
VODLS = 1.8 V
VODLS = 1.8 V
VODHS = 1.8 V
VODHS = 1.8 V
VDS_HSx
VDS_HSx
VDS_LSx
VDS_LSx
LOW
LOW
HIGH
HIGH
+
-
+
-
+
-
+
-
Table 28. Truth table with a short circuit to GND
Configuration
IPU HB1
IPU HB2
IPD HB1
IPD HB2
VDS_LS1
VDS_LS2
VDS_HS1
VDS_HS2
1
OFF
OFF
ON
ON
LOW
LOW
HIGH
HIGH
2
ON
OFF
OFF
ON
LOW
LOW
HIGH
HIGH
3
OFF
ON
ON
OFF
LOW
LOW
HIGH
HIGH
5.4.6
Open load - SH1 disconnected
Configuration 1
•
Ishx_PU HB1 OFF, Ishx_PD HB1 ON
•
Ishx_PU HB2 OFF, Ishx_PD HB2 ON
SH1 and SH2 are pulled down by their respective pull-down diagnostic current, so VDS_LS1 = VDS_LS2 = LOW.
VDS_HS1 and VDS_HS2, instead, are HIGH
Configuration 2
•
Ishx_PU HB1 ON, Ishx_PD HB1 OFF
•
Ishx_PU HB2 OFF, Ishx_PD HB2 ON
SH1 is pulled up by Ishx_PU HB1, so VDS_LS1 = HIGH and VDS1_HS1 = HIGH. Due to the motor disconnection
at SH1, SH2 is pulled down by Ishx_PD HB2, so VDS_LS2 = LOW and VDS_HS2 = HIGH
Configuration 3
•
Ishx_PU HB1 OFF, Ishx_PD HB1 ON
•
Ishx_PU HB2 ON, Ishx_PD HB2 OFF
L99MH98
Protections and diagnostics
DS14611 - Rev 3
page 40/147



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