L78 datasheet(13/54 Pages) STMICROELECTRONICS

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L78

Electrical characteristics

DocID2143 Rev 34

13/54

VI = 33 V, IO = 1 A, TJ = 0 to 125 °C (L7824AC), TJ = -40 to 125 °C (L7824AB), unless

otherwise specifieda

Table 9: Electrical characteristics of L7824A

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25 °C

23.5

24.5

Output voltage

IO = 5 mA to 1 A, VI = 27.3 to 37 V

Output voltage

IO = 1 A, VI = 37 to 38 V, TJ = 25 °C

∆VO (1)

Line regulation

VI = 27 to 38 V, IO = 500 mA, TJ = 25 °C

240

VI = 30 to 36 V

200

VI = 30 to 36 V, TJ = 25 °C

120

VI = 26.7 to 38 V, TJ = 25 °C

240

∆VO (1)

Load regulation

IO = 5 mA to 1 A

100

IO = 5 mA to 1.5 A, TJ = 25 °C

100

IO = 250 to 750 mA

Quiescent current

TJ = 25 °C

4.6

∆Iq

Quiescent current change

VI = 27.3 to 38 V, IO = 500 mA

0.8

VI = 27.3 to 38 V, TJ = 25 °C

0.8

IO = 5 mA to 1 A

0.5

SVR

Supply voltage rejection

VI = 28 to 38 V, f = 120 Hz, IO = 500 mA

Dropout voltage

IO = 1 A, TJ = 25 °C

Output noise voltage

TA = 25 °C, B = 10 Hz to 100 kHz

µV/VO

Output resistance

f = 1 kHz

Isc

Short circuit current

VI = 35 V, TA = 25 °C

0.2

Iscp

Short circuit peak current

TJ = 25 °C

2.2

∆VO/∆T

Output voltage drift

-1.5

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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