BCM400x500y1K8A3z
High Level Functional State Diagram
Conditions that cause state transitions are shown along arrows. Sub-sequence activities listed inside the state bubbles.
Application
of input voltage to VPRI_DC
VμC_ACTIVE < VPRI_DC < VPRI_UVLO+
STARTUP SEQUENCE
VPRI_DC > VPRI_UVLO+
STANDBY SEQUENCE
TM Low
TM Low
EN High
EN High
VAUX Low
VAUX Low
Powertrain Stopped
Powertrain Stopped
ENABLE falling edge,
or OTP detected
tPRI_UVLO+_DELAY
expired
Input OVLO or UVLO,
Output OCP,
ONE TIME DELAY
Fault
Auto-
recovery
INITIAL STARTUP
or UTP detected
ENABLE falling edge,
or OTP detected
FAULT
SEQUENCE
TM Low
SUSTAINED
OPERATION
TM PWM
Input OVLO or UVLO,
Output OCP,
EN High
EN High
or UTP detected
VAUX Low
VAUX High
Powertrain Stopped
Powertrain Active
Short Circuit detected
BCM® Bus Converter
Rev 1.4
07/2015
vicorpower.com
800 927.9474
Page 13 of 25
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