Electrical Characteristics 7924

79XX

Output voltage**

Parameter

Test Conditions*

7924

Min

Typ

Max

25°

C

-23

-24

-25

Units

15W

0°

C to 125°

C

-22.8

-24

-25.2

V

Input regulation

25°

C

5

480

3

240

mV

Ripple rejection

f= 120Hz

0°

C to 125°

C

54

60

dB

Output regulation

25°

C

85

480

25

240

mV

Temperature coefficient of output voltage

0°

C to 125°

C

-1

mV/°

C

Output noise voltage

f= 10Hz to 100 KHz

25°

C

600

µV

Dropout voltage

25°

C

1.1

V

Bias current

25°

C

2

3

Bias current change

0°

C to 125°

C

0.04

1

0.06

0.5

mA

Peak output current

25°

C

2.1

A

*

Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal

effects must be taken into account separately.

**

This specification applies only for dc power dissipation permitted by absolute maximum ratings.

Typical Applications Circuit

When

using

a

negative

regulator,

bypass

capacitors are

a must on both the input and output.

Recommended values are

2 µF on the input and 1 µF on the output. It is considered good

practice to include a 0.1 µF capacitor on the output to improve

the

transient

response

(Fig.

1). These

capacitors

may

mylar, ceramic,

or

tantalum,

provided

that

they have

$V

IN

2

2µF

79XX

1

1

3

$Vout

0.1µF

Ordering Information

Figure 1. Negative Regulator

O RDER ING NU M B ER

P AC K AGE

M AR K ING

79XX

TO - 220

ET79XX

Address :

6A06--6A07

Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing

Postalcode:100039

Tel: 86-010-58895780 / 81 / 82 / 83 / 84

Fax : 010-58895793

Http://www.estek.com.cn

Email:sales@estek.com.cn

REV No:01-060805

BEIJING ESTEK ELECTRONICS CO.,LTD

6