MB3882 Fujitsu Media Devices, MB3882 Datasheet - Page 21

• Manufacturer Part Number: MB3882
• Description: 2-channel DC/DC Converter IC with Synchronous Rectifier
• Manufacturer: Fujitsu Media Devices

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.
Once the protection circuit has been activated, it can be reset by lowering the VCC voltage below the reset
voltage (1.7 V min.) .
Detection voltage
V
OVP
(V) : = 1.47
(R3
V
R3
R4
O
R4) /R4
INC1
INC2)
18
7
1.47 V
OVP
Comp.
VCC
R
S
Q
MB3882
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