[AP1150ADSXX]

014011331-E-00

- 13 -

2014/10

11.3

Bias voltage and temperature characteristics of the ceramic capacitor

Generally, a ceramic capacitor has both a temperature characteristic and a voltage characteristic. Please

consider both characteristics when selecting the part. The B curves are the recommend characteristics.

0

40

100

90

70

2

4

6

8

10

12

80

60

50

B Curve

F Curve

Bias Voltage(V)

-50

40

100

90

70

-25

0

25

50

75

100

80

60

Ambinet Temperature(°C)

50

B Curve

F Curve

11.4 On/off control

It is recommended to turn the regulator off when the circuit following the regulator is non-operating. A design

with little electric power loss can be implemented. We recommend the use of the on/off control of the

regulator without using a high side switch to provide an output from the regulator. A highly accurate output

voltage with low voltage drop is obtained. Because the Vcont terminal current is small, it is possible to control

it directly by CMOS logic.

REG

Vsat

On/Off Cont.

Figure 4. Equivalent circuit of output

11.5 Noise Bypass

The noise and the ripple rejection characteristics depend on the capacitance on the Np terminal. The ripple

rejection characteristic of the low frequency region improves by increasing the capacitance of Cnp. A standard

value is Cnp=0.001F. Increase Cnp in a design with important output noise and ripple rejection requirements.

The IC will not be damaged if the capacitor value is increased. The on/off switching speed changes depending

on the Np terminal capacitance. The switching speed slows when the capacitance is large.