MB3886 데이터 시트보기 (PDF) - Fujitsu

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MB3886

2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

Fujitsu 

MB3886

s OUTPUT STATES DURING PROTECTION CIRCUIT OPERATION

The table below lists the output states with individual protection circuits actuated.

Output terminal

CH1

Protection circuit

OUT1-1

OUT2-1

PSIG1

OUT1-2

Overcurrent

CH1

L

L

L

Active

protection circuit

CH2 Active

Active

H

L

Overvoltage

CH1

L

H

L

Active

protection circuit

CH2 Active

Active

H

L

Short-circuit

CH1

L

L

H

L

protection circuit

CH2

L

L

H

L

CH2

OUT2-2

Active

L

Active

H

L

L

PSIG2

H

L

H

L

H

H

s RESETTING THE LATCH OF EACH PROTECTION CIRCUIT

When each protection circuit (overvoltage, overcurrent, or short-circuit protection circuit) detects an abnormal

state or event, it sets the latch to fix the output at the “L” level. The PSIG1 terminal (pin 1) or PSIG2 terminal

(pin 30) is fixed at the “L” level when the overvoltage or overcurrent protection circuit detects an overvoltage or

overcurrent.

When a protection circuit operates, the latch can be released by reentering the power supply or setting the CTL1

terminal (pin 2) or CTL2 terminal (pin 29) to the “L” level.

The overvoltage and overcurrent protection circuits work for each channel separately. Use the CTL1 and CTL2

terminals to unlatch CH1 and CH2, respectively.

The short-circuit protection circuit fixes the outputs of both channels upon detection of a short circuit even on

either. Set both of the CTL1 and CTL2 terminals to the “L” level to unlatch the two channels.

Operation circuit

CTL1

Unlatching Conditions

CTL2

Overcurrent protection

circuit

Overvoltage protection

circuit

OPEN

L

OPEN

L

OPEN

Short-circuit protection

circuit

L

OPEN

L

: Unlatched, × : Not unlatched

OPEN

OPEN

L

L

OPEN

OPEN

L

L

Channels unlatched

CH1

CH2

×

×

×

×

×

×

×

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