L78 datasheet(11/54 Pages) STMICROELECTRONICS

부품명	L78

상세설명	Thermal overload protection

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L78

Electrical characteristics

DocID2143 Rev 34

11/54

VI = 19 V, IO = 1 A, TJ = 0 to 125 °C (L7812AC), TJ = -40 to 125 °C (L7812AB), unless

otherwise specifieda

Table 7: Electrical characteristics of L7812A

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VO

Output voltage

TJ = 25 °C

11.75

12

12.25

V

VO

Output voltage

IO = 5 mA to 1 A, VI = 14.8 to 25 V

11.5

12

12.5

V

VO

Output voltage

IO = 1 A, VI = 25 to 27 V, TJ = 25 °C

11.5

12

12.5

V

∆VO (1)

Line regulation

VI = 14.8 to 30 V, IO = 500 mA, TJ = 25 °C

13

120

mV

VI = 16 to 12 V

16

120

mV

VI = 16 to 12 V, TJ = 25 °C

6

60

mV

VI = 14.5 to 27 V, TJ = 25 °C

13

120

mV

∆VO (1)

Load regulation

IO = 5 mA to 1 A

25

100

mV

IO = 5 mA to 1.5 A, TJ = 25 °C

30

100

IO = 250 to 750 mA

10

50

Iq

Quiescent current

TJ = 25 °C

4.4

6

mA

6

mA

DIq

Quiescent current change

VI = 15 to 30 V, IO = 500 mA

0.8

mA

VI = 14.8 to 27 V, TJ = 25 °C

0.8

mA

IO = 5 mA to 1 A

0.5

mA

SVR

Supply voltage rejection

VI = 15 to 25 V, f = 120 Hz, IO = 500 mA

60

dB

Vd

Dropout voltage

IO = 1 A, TJ = 25 °C

2

V

eN

Output noise voltage

TA = 25 °C, B = 10 Hz to 100 kHz

10

µV/VO

RO

Output resistance

f = 1 kHz

18

mΩ

Isc

Short circuit current

VI = 35 V, TA = 25 °C

0.2

A

Iscp

Short circuit peak current

TJ = 25 °C

2.2

A

∆VO/∆T

Output voltage drift

-1

mV/°C

Notes:

(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.

a Minimum load current for regulation is 5 mA.

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