MB3882 Ver la hoja de datos (PDF) - Fujitsu

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MB3882

2-channel DC/DC Converter IC with Synchronous Rectifier

Fujitsu 

MB3882

s OVERVOLTAGE PROTECTION CIRCUIT VOTAGE SETTING

Overvoltage conditions in the DC/DC converter output voltage can be detected by connecting external resistance

from the DC/DC converter output voltage to the +INC1 terminal (pin 7) and +INC2 terminal (pin 18) on the

respective overvoltage protection comparator circuits (OVP comp. 1, 2) .

When the output voltage of the DC/DC converter rises above the detection voltage, the overvoltage protection

comparator (OVP Comp. 1, 2) output goes to “H” level, setting a latch and shutting off the corresponding channel.

Each of the overvoltage protection circuit latches operates independently.

Detection voltage

VOVP (V) =: 1.47 × (R3 + R4) /R4

Once the protection circuit has been activated, it can be reset by lowering the VCC voltage below the reset

voltage (1.7 V min.) .

VO

R3

(+INC2) 18

7

+INC1

R4

VCC

OVP

+ Comp.

−

RQ

S

1.47 V

21

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