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L99PM72PXP bảng dữ liệu(PDF) 46 Page - STMicroelectronics

tên linh kiện L99PM72PXP
Giải thích chi tiết về linh kiện  Advanced power management system IC with embedded LIN and high speed CAN transceiver supporting CAN Partial Networking
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L99PM72PXP bảng dữ liệu(HTML) 46 Page - STMicroelectronics

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Protection and diagnosis
L99PM72PXP
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Doc ID 023553 Rev 3
The PWM 1/3 channels start a PWM period with the ON phase, while the PWM 2/4
channels start with the OFF phase. In this way it is possible to use the 4 PWM channels in a
phase shifted way. The picture below shows this feature with a duty cycle of 25% for both
PWM channels.
Figure 24.
Phase shifted PWM
3.4
Low side driver outputs REL1, REL2
The outputs REL1, REL2 (RDSon =2  typ. @25 C) are specially designed to drive relay
loads.
The outputs provide an active output zener clamping (45 V typ.) feature for the
demagnetization of the relay coil, even though a load dump condition exists.
For Fail_safe reasons the relay drivers are linked with the fail safe operation: In case of
entering the Fail Safe Mode, the relay drivers switch off and the SPI control bits are set to
default (i.e. driver is off).
The low side drivers switch off in case of:
●
VS overvoltage and undervoltage
●
Overcurrent
●
Overtemperature with pre warning
OUT3
PWM 3
-
OUT4
PWM 4
Timer 2
OUTHS
PWM 3 / PWM 4
Timer 1 / Timer 2
Table 8.
PWM configuration for high-side outputs (continued)
High side output
PWM channel
Internal timer



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