LM7818CT 查看數據表（PDF） - Fairchild Semiconductor

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LM7818CT

3-Terminal 1 A Positive Voltage Regulator

Fairchild Semiconductor 

Electrical Characteristics (LM7824) (Continued)

Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 33V, CI = 0.33µF, CO = 0.1µF, unless otherwise specified.

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

VO Output Voltage

TJ = +25°C

Regline Line Regulation(17)

5mA ≤ IO ≤ 1A, PO ≤ 15W,

VI = 27V to 38V

TJ = +25°C VI = 27V to 38V

Regload Load Regulation(17)

VI = 30V to 36V

TJ = +25°C IO = 5mA to 1.5A

IO = 250mA to 750mA

IQ Quiescent Current

TJ = +25°C

∆IQ Quiescent Current Change IO = 5mA to 1A

∆VO/∆T Output Voltage Drift(18)

VI = 27V to 38V

IO = 5mA

VN Output Noise Voltage

RR Ripple Rejection(18)

f = 10Hz to 100kHz, TA = +25°C

f = 120Hz, VI = 28V to 38V

VDROP Dropout Voltage

rO Output Resistance(18)

IO = 1A, TJ = +25°C

f = 1kHz

23.0

22.8

–

–

–

–

–

–

–

–

–

50.0

–

–

24.0 25.0

V

24.0 25.25

17.0

480

mV

6.0

240

15.0

480

mV

5.0

240

5.2

8.0

mA

0.1

0.5

mA

0.5

1.0

-1.5

–

mV/°C

60.0

–

µV/VO

67.0

–

dB

2.0

–

V

28.0

–

mΩ

ISC Short Circuit Current

IPK Peak Current(18)

VI = 35V, TA = +25°C

TJ = +25°C

–

230

–

mA

–

2.2

–

A

Notes:

17. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must

be taken into account separately. Pulse testing with low duty is used.

18. These parameters, although guaranteed, are not 100% tested in production.

11

LM78XX/LM78XXA Rev. 1.0

www.fairchildsemi.com

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