upc1909 Renesas Electronics Corporation., upc1909 Datasheet - Page 16

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

16
3.4 On/Off Operation
also causes discharge of the soft start capacitor externally connected to the DTC
connected to the C
The output of OUT
To prevent chattering when turning on and off slowly, the threshold voltage of the ON/OFF pin has a 0.2-V hysteresis.
The waveforms during the on/off operation are shown in Figure 3-5 below.
T
pin.
1
ON/OFF
and OUT
OUT
OUT
DTC
DTC
FB
1
2
1
2
2
C
T
can be made low level (off) by making the voltage of the ON/OFF pin low level. This
Figure 3-5. Waveforms During On/Off Operation
dC
Data Sheet G14309EJ2V0DS00
T
V
IN(OFF)
Discharge of C
T
7
V
IN(ON)
T
, DTC
1
DTC
1
1
pin and the timing capacitor externally
T
8
PC1909