L4962 datasheet(3/15 Pages) STMICROELECTRONICS

3 / 15 page

Symbol

Parameter

Test Condition s

Min.

Typ.

Max.

Unit

DYNAMIC CHARACTERISTICS

Output voltage range

Vi = 46V

Io =1A

Vref

Input voltage range

Vo =Vref to 36V

Io = 1.5A

∆ Vo

Line regulation

Vi = 10V to 40V

Vo =Vref

Io =1A

∆ Vo

Load regulation

Vo =Vref

Io = 0.5A to 1.5A

Vref

Internal reference voltage

(pin 10)

Vi = 9V to 46V

Io = 1A

5.1

5.2

∆ Vref

∆ T

Average temperature

coefficient of refer. voltage

Tj =0

°C to 125°C

Io =1A

0.4

mV/

°C

Dropout voltage

Io = 1.5A

1.5

Iom

Maximum operating load

current

Vi = 9V to 46V

Vo =Vref to 36V

1.5

I2L

Current limiting threshold

(pin 2)

Vi = 9V to 46V

Vo =Vref to 36V

3.3

ISH

Input average current

Vi = 46V;

output short-circuit

Efficiency

f = 100KHz

Vo =Vref

Io =1A

Vo = 12V

SVR

Supply voltage ripple

rejection

∆ Vi =2Vrms

fripple = 100Hz

Vo =Vref

Io = 1A

ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tj =25

°C, Vi = 35V, unless otherwise

specified)

HEPTAWATT

POWERDIP

NAME

FUNCTION

4, 5, 12, 13

GROUND

Common ground terminal.

OSCILLATOR

A parallel RC network connected to this terminal

determines the switching frequency. This pin must be

connected to pin 7 input when the internal oscillator is

used.

SOFT START

Soft start time constant. A capacitor is connected

between this terminal and ground to define the soft start

time constant. This capacitor also determines the

average short circuit output current.

OUTPUT

Regulator output.

1, 3, 6,

8, 9, 16

N.C.

PIN FUNCTIONS (cont’d)

3/15

L4962

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