BM6112FV-C
Description of Functions and Examples of Constant Setting – continued
(3) Under Voltage Lockout (UVLO) Function
BM6112FV-C incorporates under voltage lockout (UVLO) function both on the input and the output sides. When the
power supply voltage drops to UVLO ON voltage, the OUT1L pin and the RDY pin will output a “L” signal. When the
power supply voltage rises to UVLO OFF voltage, these pins will be reset. To prevent malfunctions due to noise, Filtering
time tUVLO1FIL and tUVLO2FIL are set on both input and output sides.
H
INA
L
VUVLO1H
VUVLO1L
VCC1
RDY
OUT1H, OUT1L
Hi-Z
L
H
L
Figure 56. Input-side UVLO Function Operation Timing Chart
H
INA
L
VUVLO2H
VUVLO2L
VCC2
RDY
OUT1H, OUT1L
Hi-Z
L
H
Hi-Z
L
Figure 57. Output-side UVLO Operation Timing Chart
(4) Short Circuit Protection (SCP) Function
When the SCPIN1 pin voltage or the SCPIN2 pin voltage exceeds a voltage set with VSCDET (Typ 0.7 V) parameter, SCP
function will be activated. When SCP function is activated, the OUT1H pin and the OUT1L pin voltage will be set to “Hi-
Z” level, and both the PROOUT1 pin and the PROOUT2 pin turn on for tPRO2ON (Typ 160 ns). After tPRO2ON (Typ 160 ns),
only the PROOUT1 pin continues to turn on. First, the PROOUT1 pin voltage and the PROOUT2 pin voltage will go to
the “L” level (soft turn-off). Next, when the OUT1H pin voltage < VOUT2ON (Typ 2 V), the OUT1H pin and the OUT1L pin
become L and the PROOUT1 pin become Hi-Z. Finally, SCP function will be released at the rising edge of the ENA.
H
L
H
INA
tSCPINLEB
ENA
L
tENAFIL
VSCDET
SCPINx
tSCPFIL
H
OUT1H, OUT1L
Hi-Z
L
Hi-Z
L
Hi-Z
L
Hi-Z
PROOUT1
PROOUT2
tPRO2ON
tDFLT
FLT
L
tDOUT2ON
Gate Voltage
VOUT2ON
Figure 58. SCP Operation Timing Chart
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