MB3889 Datasheet, PDF (24/35 Pages) Fujitsu Component Limited. – 2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

MB3889
s OUTPUT STATES DURING PROTECTION CIRCUIT OPERATION
The table below lists the output states with each protection circuits actuated.
Protection circuit
Output terminal
CH1
OUT1-1 OUT2-1
CH2
OUT1-2 OUT2-2
CH1
L
L
L
L
Overcurrent protection circuit
CH2
L
L
L
L
Short-circuit protection
CH1
L
L
L
L
CH2
L
L
L
L
Overvoltage protection circuit
CH1
L
H
L
H
CH2
L
H
L
H
Under voltage lockout protection circuit
L
L
L
L
PWRGOOD
L
L
L
L
L
L
L
s RESETTING THE LATCH OF EACH PROTECTION CIRCUIT
When the overvoltage, overcurrent, or short-circuit protection circuit detects each abnormality, it sets the latch
to fix the output at the "L" level. The PWRGOOD terminal (pin 12) is fixed at the "L" level upon abnormality
detection by each protection circuit.
To reset the actuated protection circuit, either the power supply turn off and on again or set the CTL terminal
(pin 6) to the "L" level to lower the VREF terminal (pin 8) voltage to 1.7 V (Min) or less. It can also be reset by
setting both of the CTL1 terminal (pin 9) and CTL2 terminal (pin 10) to the "L" level.
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