CS8161 datasheet(5/8 Pages) CHERRY

5 / 8 page

Definition of Terms

Dropout Voltage:

The input-output voltage differential at

which the circuit ceases to regulate against further

reduction in input voltage. Measured when the

output voltage has dropped 100mV from the nom-

inal value obtained at 14V input, dropout voltage

is dependent upon load current and junction tem-

perature.

Input Voltage:

The DC voltage applied to the input termi-

nals 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 tempera-

ture.

Long Term Stability:

Output voltage stability under accel-

erated life-test conditions 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 contribute to the positive load cur-

rent. i.e., the regulator ground lead current.

Ripple Rejection:

The ratio of the peak-to-peak input rip-

ple voltage to the peak-to-peak output ripple volt-

age.

Temperature Stability of VOUT: The percentage change in

output voltage for a thermal variation from room

temperature to either temperature extreme.

-40

-20

100

120

140

1.285

1.290

1.295

1.300

1.305

Temperature (Deg. C)

VIN = 14.0V

Enable Threshold Voltage vs.

Temperature

Typical Performance Characteristics: continued

VENABLE

0.0

5.0

4.0

3.0

2.0

1.0

510

ENABLE Current vs. ENABLE Voltage

VENABLE (V)

100

Cursor ( 1.8500V, 253.9nA.)

Marker ( 1.8500V, 253.9nA.)

12mA ENABLE Current vs.

ENABLE Voltage

025

100

125

150

175

200

225

250

100

150

200

250

350

450

500

600

800

Output Current (mA)

VIN = 4.0V

No Load on VOUT1

750

700

650

300

550

125

°C

-40

°C

Dropout Voltage vs. Output Current for VOUT

200

250

100

125

150

175

225

Output Current (mA)

VIN = 4.0V

125

°C

-40

°C

Quiescent Current vs. Output Current @ Dropout for VOUT

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