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Chapter 17 Gate Drive Unit (GDUV4)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
651
17.4.5
Desaturation Error
A desaturation error is generated if the output signal at HSx does not properly reflect the drive condition
of the low-side and high-side FET pre-drivers. The GDU integrates three desaturation comparators for the
low-side FET pre-drivers and three desaturation comparators for the high-side FET pre-drivers.
If the low-side power FET T2 (see
) is turned on and the drain source voltage V
DS2
of T2 is
greater than V
desatls
after the blanking time t
BLANK
a desaturation error will be flagged
.
In this case the
associated desaturation error flag GDLSIF[2:0] will be set (see
) and the low-side power FET
T2 will be turned off. The level of the voltage V
desatls
can be adjusted in the range of 0.30V to 1.35V. (see
)
If the high-side power FET T1 (see
) is turned on and the drain source voltage V
DS1
is greater
than V
desaths
after the blanking time t
BLANK
a desaturation error will be flagged.In this case the associated
desaturation error flag GDHSIF[2:0] will be set (see
) and the high-side power FET T1 will be
turned off. The level of the voltage V
desaths
can be adjusted in the range of 0.30 to 1.35V (see
).
The low-side and high-side desaturation interrupt flags GDHSIF and GDLSIF are cleared by writing a one
to the associated flag. After the flag is cleared the associated low-side or high-side FET pre-driver is
enabled again and is driven by the source selected in the PMF module.
Figure 17-20. Desaturation Comparators and Phase Comparators
hs_on
ls_on
HGx
HSx
LGx
R
sense
V
HD
-
+
V
HD
/2
+
-
V
desatls
GDSLLS[2:0]
=
Desat. Comp. Low-Side Driver
Phase Comp.
Desaturation Error Low-Side.
Phase Status
V
desaths
GDSLHS[2:0]
Desat. Comp. High-Side Driver
Desaturation Error High-Side
.
V
DS2
T1
T2
High-Side FET
Low-Side FET
Pre-Driver
Pre-Driver
LSx
V
DS1
-
+
=
HD
Содержание MC9S12ZVM series
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Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...