BD8624EFV ROHM [Rohm], BD8624EFV Datasheet - Page 12

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

Overcurrent protection function (OCP)
Overcurrent protection function compared drain voltage (LX terminal voltage) with internal OCP terminal voltage when
internal Nch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS
would be OFF.
Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and
continues more than set time in external resistance.
RT terminal open/short protection function
RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short
condition internally from RT terminal to prevent from output voltage error caused by error oscillation of
internal triangular wave at RT terminal open/short.
RT terminal open/short protection function is regularly enabled after boot-up.
RT terminal open/short protection function operates when error detection condition continues more than set
time in external resistance.
terminal
>V
<V
CTL
IHCTL
ILCTL
SS terminal
>1.1V(typ)
<1.0V(typ)
-
Table 6 overcurrent protection function
Output current
Figure 5-2．Overcurrent protection
>I
<I
-
-
lmt
lmt
12 / 14
protection function
Overcurrent
Disable
Disable
Enable
OCP
LX
protection operation
DRV
DRV
Rocp
A
B
Overcurrent
OFF
OFF
OFF
ON
Output
current