LM396 National Semiconductor, LM396 Datasheet

LM396

Manufacturer Part Number

LM396

Description

10 Amp Adjustable Voltage Regulator

Manufacturer

National Semiconductor

Datasheet

1.LM396.pdf (14 pages)

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C 1995 National Semiconductor Corporation

LM196 LM396 10 Amp Adjustable Voltage Regulator

General Description

The LM196 is a 10 amp regulator adjustable from 1 25V to

15V which uses a revolutionary new IC fabrication structure

to combine high power discrete transistor technology with

modern monolithic linear IC processing This combination

yields a high-performance single-chip regulator capable of

supplying in excess of 10 amps and operating at power lev-

els up to 70 watts The regulators feature on-chip trimming

of reference voltage to

of reference temperature drift to 30 ppm C typical Thermal

interaction between control circuitry and the pass transistor

which affects the output voltage has been reduced to ex-

tremely low levels by strict attention to isothermal layout

This interaction called thermal regulation is 100% tested

These new regulators have all the protection features of

popular lower power adjustable regulators such as LM117

and LM138 including current limiting and thermal limiting

The combination of these features makes the LM196 im-

mune to blowout from output overloads or shorts even if

the adjustment pin is accidentally disconnected All devices

are ‘‘burned-in’’ in thermal shutdown to guarantee proper

operation of these protective features under actual overload

conditions

Output voltage is continuously adjustable from 1 25V to

15V Higher output voltages are possible if the maximum

input-output voltage differential specification is not exceed-

ed Full load current of 10A is available at all output volt-

ages subject only to the maximum power limit of 70W and

of course maximum junction temperature

Typical Applications

0 8% and simultaneous trimming

TL H 9059

OUT

FIGURE 1 Basic 1 25V to 15V Regulator

(1 25V)

The LM196 is exceptionally easy to use Only two external

resistors are used to to set output voltage On-chip adjust-

ment of the reference voltage allows a much tighter specifi-

cation of output voltage eliminating any need for trimming in

most cases The regulator will tolerate an extremely wide

range of reactive loads and does not depend on external

capacitors for frequency stabilization Heat sink require-

ments are much less stringent because overload situations

do not have to be accounted for only worst-case full load

conditions

The LM196 is in a TO-3 package with oversized (0 060 )

leads to provide best possible load regulation Operating

junction temperature range is

LM396 is specified for a 0 C to

ture range

Features

Output pre-trimmed to

10A guaranteed output current

70W maximum power dissipation

Adjustable output 1 25V to 15V

Internal current and power limiting

Guaranteed thermal resistance

Output voltage guaranteed under worst-case conditions

Output is short circuit protected

Product Enhancement tested

TL H 9059 – 1

ADJ

(R2)

For best TC of V

or metal film 1% or better

R2 should be same type as R1 with TC track-

ing of 30 ppm C or better

C1 is necessary only if main filter capacitor is

more than 6 away assuming

leads

C2 is not absolutely necessary but is suggest-

ed to lower high frequency output impedance

Output capacitors in the range of 1

1000

are commonly used to provide improved out-

put impedance and rejection of transients

C3 improves ripple rejection output imped-

ance and noise C2 should be 1 F or larger

close to the regulator if C3 is used

0 8%

F of aluminum or tantalum electrolytic

125 C junction tempera-

55 C to

OUT

RRD-B30M115 Printed in U S A

R1 should be wirewound

August 1992

150 C The

18 or larger

F to

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