MB3885 Ver la hoja de datos (PDF) - Fujitsu

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MB3885

1-channel DC/DC Converter IC with Synchronous Rectifier

Fujitsu 

MB3885

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 +INC terminal (pin 9) on the respective overvoltage protection

comparator circuits (OVP comp.) .

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

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

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

9

+INC1

R4

VCC

OVP

+ Comp.

−

RQ

S

1.47 V

20

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