upc1909 Renesas Electronics Corporation., upc1909 Datasheet - Page 17

• Manufacturer Part Number: upc1909
• Description: Switching Regulator Control Ic
• Manufacturer: Renesas Electronics Corporation.

3.5 Overvoltage Protection Operation
detection of overvoltage caused by abnormal boosting of the output of the converter.
voltage of the OV pin exceeds V
occurs are shown in Figure 3-7 below.
2 V TYP.), and drop the voltage of the V
The overvoltage latch circuit is a protection circuit that stops the power supply to prevent damage to the load after
The internal configuration of the overvoltage latch circuit is shown in Figure 3-6 below.
The threshold voltage (V
To reset the status of the overvoltage latch, drop the voltage of the V
V
OV
REF
TH(OV)
OUT
OUT
DTC
DTC
Overvoltage detection comparator
OV
14
FB
1
1
2
1
2
) connected to the overvoltage detection comparator is 2.0 to 2.8 V (2.4 V TYP.). If the
Figure 3-7. Waveforms When Overvoltage Latch Is Operating
TH(OV)
C
T
, OUT
V
Figure 3-6. PC1909 Overvoltage Latch Circuit
REF
TH(OV)
dC
pin to a sufficiently low level.
1
T
and OUT
Data Sheet G14309EJ2V0DS00
2
are latched to low level. The waveforms when OV (overvoltage)
t
d(OV)
Flip-flop
S
R
Q
V
TH(OV)
CC
pin to below the OVL release voltage (V
T
9
To output circuit of OUT
1
, OUT
2
PC1909
R(OV)
17
=