Electrical characteristics

L7800 series

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Table 21.

Electrical characteristics of L7820C (refer to the test circuits, TJ = -55 to 150°C, VI = 28V,

IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VO

Output voltage

TJ = 25°C

19.2

20

20.8

V

VO

Output voltage

IO = 5mA to 1A, PO ≤15W

VI = 23 to 35V

19

20

21

V

∆VO(1)

Line regulation

VI = 22.5 to 35V, TJ = 25°C

400

mV

VI = 26 to 32V, TJ = 25°C

200

∆VO(1)

Load regulation

IO = 5 mA to 1.5A, TJ = 25°C

400

mV

IO = 250 to 750mA, TJ = 25°C

200

Id

Quiescent current

TJ = 25°C

8

mA

∆Id

Quiescent current change

IO = 5mA to 1A

0.5

mA

VI = 23 to 35V

1

∆VO/∆T Output voltage drift

IO = 5mA

-1

mV/°C

eN

Output noise voltage

B =10Hz to 100KHz, TJ = 25°C

150

µV/VO

SVR

Supply voltage rejection

VI = 24 to 35V, f = 120Hz

52

dB

Vd

Dropout voltage

IO = 1A, TJ = 25°C

2

V

RO

Output resistance

f = 1 KHz

24

m

Ω

Isc

Short circuit current

VI = 35V, TJ = 25°C

0.18

A

Iscp

Short circuit peak current

TJ = 25°C

2.1

A

1.

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 cycle is used.