78S40 datasheet(3/10 Pages) NSC

3 / 10 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Storage Temperature Range

Ceramic DIP

−65˚C to +175˚C

Molded DIP

−65˚C to +150˚C

Operating Temperature Range

Extended (LM78S40J)

−55˚C to +125˚C

Industrial (LM78S40N)

−40˚C to +125˚C

Commercial (LM78S40CN)

0˚C to +70˚C

Lead Temperature

Ceramic DIP (Soldering, 60 sec.)

300˚C

Molded DIP (Soldering, 10 sec.)

265˚C

Internal Power Dissipation (Note 2) (Note 3)

16L-Ceramic DIP

1.50W

16L-Molded DIP

1.04W

Input Voltage from V

IN to GND

40V

Input Voltage from V

+ (Op Amp)

to GND

40V

Common Mode Input Range

(Comparator and Op Amp)

−0.3 to V+

Differential Input Voltage

(Note 4)

±30V

Output Short Circuit

Duration (Op Amp)

Continuous

Current from V

REF

10 mA

Voltage from Switch

Collectors to GND

40V

Voltage from Switch

Emitters to GND

40V

Voltage from Switch

Collectors to Emitter

40V

Voltage from Power Diode to GND

40V

Reverse Power Diode Voltage

40V

Current through Power Switch

1.5A

Current through Power Diode

1.5A

ESD Susceptibility

(to be determined)

LM78S40

Electrical Characteristics (Note 5)

A = Operating temperature range, VIN = 5.0V, V

+(Op Amp) = 5.0V, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

GENERAL CHARACTERISTICS

Supply Current

IN = 5.0V

1.8

3.5

(Op Amp Disconnected)

IN = 40V

2.3

5.0

Supply Current

IN = 5.0V

4.0

(Op Amp Connected)

IN = 40V

5.5

REFERENCE SECTION

REF

Reference Voltage

REF = 1.0 mA

Extend −55˚C < T

A <

+125˚C,

Comm 0 < T

A < +70˚C,

1.180

1.245

1.310

Indus −40˚C < T

A < +85˚C

R LINE

Reference Voltage

IN = 3.0V to VIN = 40V,

0.04

0.2

mV/V

Line Regulation

REF = 1.0 mA, TA = 25˚C

R LOAD

Reference Voltage

REF = 1.0 mA to IREF = 10 mA,

0.2

0.5

mV/mA

Load Regulation

A = 25˚C

OSCILLATOR SECTION

CHG

Charging Current

IN = 5.0V, TA = 25˚C

µA

CHG

Charging Current

IN = 40V, TA = 25˚C

µA

DISCHG

Discharge Current

IN = 5.0V, TA = 25˚C

150

250

µA

DISCHG

Discharge Current

IN = 40V, TA = 25˚C

150

350

µA

OSC

Oscillator Voltage Swing

IN = 5.0V, TA = 25˚C

0.5

on/toff

Ratio of Charge/

6.0

µs/µs

Discharge Time

CURRENT LIMIT SECTION

CLS

Current Limit Sense

Voltage

A = 25˚C

250

350

OUTPUT SWITCH SECTION

SAT 1

Output Saturation Voltage 1

SW = 1.0A (Figure 1)

1.1

1.3

SAT 2

Output Saturation Voltage 2

SW = 1.0A (Figure 2)

0.45

0.7

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