STCC08 Datasheet, PDF (7/13 Pages) STMicroelectronics – AC switch failure mode detector

STCC08
Functional description
Figure 4. Failure mode detection for inductive loads in DC control mode
AC LINE
NORMAL MODE
SHORT CIRCUIT
DIODE MODE
LOAD CURRENT
IN
AVF
SUGGESTED
READING TIME
NORMAL MODE
SHORT CIRCUIT
DIODE MODE
The microcontroller can store the AC switch drive signal in a RAM register when it is driving
the STCC08 input. Therefore it can save gate energy while determining conduction state
from this RAM register and multiplexing this information with AVF signal.
AC LINE: High voltage between AC line and neutral
LOAD CURRENT: Current through the AC load
IN: MCU output driving the STCC08 IN input.
AVF: Alternating voltage feedback, output of the STCC08
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