MB3885 Fujitsu Microelectronics, Inc., MB3885 Datasheet - Page 20

• Manufacturer Part Number: MB3885
• Description: 1-channel Dc/dc Converter Ic With Synchronous Rectifier
• Manufacturer: Fujitsu Microelectronics, Inc.

20
MB3885
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.
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
9
1.47 V
OVP
Comp.
VCC
R
S
Q