MB3882

21

s

s

s

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

× (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.) .

+

−

18

7

R3

R4

(+INC2)

+INC1

OVP

Comp.

1.47 V

RQ

S

VCC