CS8161

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7

Figure 17. Typical Circuit Waveform

14 V

0 V

0 V

2.0 V

0.8 V

ENABLE

60 V

12 V

5.0 V

34 V

12 V

2.4 V

3.0 V

26 V

12 V

0 V

12 V

5.0 V

12 V

14V

0 V

Load

Dump

Line

Noise, Etc.

Short

Circuit

Thermal

Shutdown

Turn

Off

Turn

On

2.4 V

Short

Circuit

0 V

0 V

0 V

5.0 V

APPLICATION DIAGRAM

Figure 18. Application Diagram

CS8161

ENABLE

GND

+

+

0.1

mF

22

mF

22

mF

Tuner

Display

APPLICATION NOTES

Since both outputs are controlled by the same ENABLE,

the CS8161 is ideal for applications where a sleep mode is

required. Using the CS8161, a section of circuitry such as a

display and nonessential 5.0 V circuits can be shut down

under microprocessor control to conserve energy.

The example in the Applications Diagram (Figure 18)

shows an automotive radio application where the display is

the ignition and the Radio On/Off switch are on.

Stability Considerations

The output or compensation capacitor (Application

characteristics of a linear regulator: startup delay, load

transient response and loop stability.

The capacitor value and type should be based on cost,

availability, size and temperature constraints. A tantalum or

aluminum electrolytic capacitor is best, since a film or

ceramic capacitor with almost zero ESR can cause

instability. The aluminum electrolytic capacitor is the

cheapest solution, but, if the circuit operates at low

temperatures (−25

°C to −40°C), both the value and ESR of

the capacitor will vary considerably. The capacitor

manufacturers data sheet usually provides this information.