BD8624EFV ROHM [Rohm], BD8624EFV Datasheet - Page 11

• Manufacturer Part Number: BD8624EFV
• Description: Built-in 1ch FET Synchronous Rectification Type DC/DC converters
• Manufacturer: ROHM [Rohm]

● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection
operation.
Low voltage protection function(LVP)
Low voltage protection function detects set output voltage V
compared to internal reference level.
Low voltage protection function operates when FB terminal voltage falls below V
than set time in external resistance.
Overvoltage protection function (OVP)
Overvoltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter
controller compared to internal reference level.
Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.2 × VREF) and continues more
than set time in external resistance.
※Constant voltage protection function is enabled when SS terminal voltage becomes more than 1.1V (typ) in the transition
※Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the
to ON control (during soft start).
transition to ON control (during soft start).
terminal
>V
terminal
>V
<V
<V
CTL
CTL
IHCTL
IHCTL
ILCTL
ILCTL
SS terminal
SS terminal
>1.1V(typ)
<1.0V(typ)
>1.1V(typ)
<1.0V(typ)
-
-
Table 4 Low voltage protection function
Table 5 Overvoltage protection function
>V
FB terminal
FB terminal
LVP
Figure 5-1．Low voltage / overvoltage protection
>V
<V
<V
+V
-
-
-
-
OVP
OVP
LVP
LVP_HYS
11 / 14
protection function
O
protection function
from FB terminal and off-latched DC/DC converter
Overvoltage
Low voltage
Disable
Disable
Disable
Disable
Enable
Enable
LVP
(=0.7 × VREF) and continues more
protection operation
protection operation
Overvoltage
Low voltage
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON