CS8135 데이터 시트보기 (PDF) - Cherry semiconductor

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CS8135

5V, 5V Low Dropout Dual Regulator with RESET/ENABLE

Cherry semiconductor 

Definition of Terms

Dropout Voltage

The input-output voltage differential at which the circuit

ceases to regulate against further reduction in input volt-

age. Measured when the output voltage has dropped

100mV from the nominal value obtained at 14V input,

dropout voltage is dependent upon load current and junc-

tion temperature.

Input Voltage

The DC voltage applied to the input with respect to ground.

Input Output Differential

The voltage difference between the unregulated input

voltage and the regulated output voltage for which the

regulator will operate.

Line Regulation

The change in output voltage for a change in the input

voltage. The measurement is made under conditions of

low dissipation or by using pulse techniques such that the

average chip temperature is not significantly affected.

Load Regulation

The change in output voltage for a change in load current

at constant chip temperature.

Long Term Stability

Output voltage stability under accelerated life-test condi-

tions after 1000 hours with maximum rated voltage and

junction temperature.

Output Noise Voltage

The rms AC voltage at the output, with constant load and

no input ripple, measured over a specified frequency

range.

Quiescent Current

The part of the positive input current that does not con-

tribute to the positive load current. i.e., the regulator

ground lead current.

Ripple Rejection

The ratio of the peak-to-peak input ripple voltage to the

peak-to-peak output ripple voltage.

Temperature Stability of VOUT

The percentage change in output voltage for a thermal

variation from room temperature to either temperature

extreme.

Current Limit

Peak current that can be delivered to the output.

Typical Circuit Waveform

60V

31V

26V

14V

VIN 14V

3V

SWITCH OPEN

5V

VOUT1 0V

5V

CLOSED

5V

2.4V

5V

0V

OPEN

5V

0V

RESET 0V

VOUT2 5V

5V

2.4V

5V

System

Condition

Turn

On

Load

Dump

*Reference Test & Application Circuit

Low VIN

Line, Noise, Etc.

VOUT1

Short

Circuit

Thermal

Shutdown

Turn

Off

Circuit Description

Standby Output

The CS8135 is equipped with two outputs. The second out-

put is intended for use in systems requiring standby mem-

ory circuits. While the high current regulator output can be

controlled with the RESET lead described below, the stand-

by output remains on under all conditions as long as suffi-

cient input voltage is applied to the IC. Thus, memory and

other circuits powered by this output remain unaffected by

positive line transients, thermal shutdown, etc.

The standby regulator circuit is designed so that the quies-

cent current to the IC is very low (<3mA) when the other

regulator output is off.

In applications where the standby output is not needed, it

may be disabled by connecting a resistor from the standby

output to the supply voltage. This eliminates the need for

a capacitor on the output to prevent unwanted oscilla-

tions. The value of the resistor depends upon the mini-

mum input voltage expected for a given system. Since the

standby output is shunted with an internal diode zener,

the current through the external resistor should be suffi-

cient to bias VOUT2 up to this point. Approximately 60µA

will suffice, resulting in a 10k½ external resistor for most

applications.

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