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L9945TR bảng dữ liệu(PDF) 35 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L9945TR bảng dữ liệu(HTML) 35 Page - STMicroelectronics

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Note:
since current limitation makes use of shunt sensing, the blanking time programmed for CH3/CH7 has no effect in
detection timings. The blanking time has only effect on FETs using DSM.
Figure 18. Current limitation iterations (until OC failure)
tBLANK_HB
toff
ILIM_th
(CH3/7)
OC_th
(CH4/8)
tBLANK_HB
t
tOC
NON1/5
(NPWM)
OC Failure
toff
HBx_ILIM
Internal
NPWM
tBLANK_HB
0A
0s
toc
Ch4/8
toc
Ch3/7
CH3/7
CH4/8
tOC
freewheeling
OC Failure
Running Timers
toc
toff
tBLANK_HB
Current through
Load and Rshunt
Current through
Load only
Current through
Rshunt only
GAPG0102161522CFT
When current limitation threshold is reached for the first time, a dedicated HBx_ILIM latch is set, indicating that
current limitation function has been activated. This latch is cleared on SPI readout.
The OFF time interval for current limitation (tOFF) is selectable via SPI according to HBx_toff bit:
L9945
H-Bridge
DS12275 - Rev 8
page 35/151



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