CS8161 데이터 시트보기 (PDF) - Cherry semiconductor

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CS8161

12V, 5V Low Dropout Dual Regulator with ENABLE

Cherry semiconductor 

Typical Circuit Waveform

60V

VIN 14V

31V

26V

3V

14V

ENABLE 2.0V

0.8V

VOUT1 0V

VOUT2 0V

12V

5V

System

Condition

Turn

On

Load

Dump

12V

12V

2.4V

5V

2.4V

12V

0V

0V

5V

0V

Low VIN

Line Noise, Etc.

VOUT1

Short

Circuit

VOUT2

Short

Circuit

Application Diagram

Thermal

Shutdown

VOUT1

12V

0V

0V

Turn

Off

C1*

0.1 mF

VIN

VOUT1

+

C2**

CS8161

22mF

ENABLE

Display

Gnd

VOUT2

+

C3**

22mF

Tuner

NOTES:

* C1 required if regulator is located far from power supply filter.

** C2, C3 required for stability, value may be increased. Capacitor must operate at minimum temperature expected.

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 5V circuits can be shut down

under microprocessor control to conserve energy.

The example in the Applications Diagram shows an auto-

motive radio application where the display is powered by

the 12V on VOUT1 and the Tuner IC is powered by the 5V

on VOUT2. Neither output is required unless both the igni-

tion and the Radio On/Off switch are on.

Stability Considerations

The output compensation capacitor (Application diagram

C2 and C3) helps determine three main characteristics of a

linear regulator: start-up 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 insta-

bility. The aluminum electrolytic capacitor is the least

expensive solution, but, if the circuit operates at low tem-

peratures (-25¡C to -40¡C), both the value and ESR of the

capacitor will vary considerably. The capacitor manufac-

turers data sheet usually provide this information.

The values for the output capacitors C2 and C3 shown in

the Applications Circuit should work for most applica-

tions, however it is not necessarily the best solution.

To determine an acceptable value for C2 and C3 for a par-

ticular application, start with tantalum capacitors of the

recommended value on each output and work towards

less expensive alternative parts for each output in turn.

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