LM1578A datasheet(5/18 Pages) NSC

Il numero della parte	LM1578A

Spiegazioni elettronici	Switching Regulator

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Produttore elettronici	NSC [National Semiconductor (TI)]

Homepage	http://www.national.com

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5 / 18 page

Typical Performance Characteristics (Continued)

Test Circuit*

Parameter tests can be made using the test circuit shown.

Select the desired V

in, collector voltage and duty cycle with

adjustable power supplies. A digital volt meter with an input

resistance greater than 100 M

Ω should be used to measure

the following:

Input Reference Voltage to Ground; S1 in either position.

Level Shift Accuracy (%) = (T

P3(V)/1V) x 100%;S1atI1 = I2

= 1mA

Input Current (mA) = (1V − T

p3 (V))/1 MΩ:S1atI1 = I2 =

0 mA.

Oscillator parameters can be measured at T

p4 using a fre-

quency counter or an oscilloscope.

The Current Limit Sense Voltage is measured by connecting

an adjustable 0-to-1V floating power supply in series with the

current limit terminal and referring it to either the ground or

the V

in terminal. Set the duty cycle to 90% and monitor test

point T

P5 while adjusting the floating power supply voltage

until the LM1578A’s duty cycle just reaches 0%. This voltage

is the Current Limit Sense Voltage.

The Supply Current should be measured with the duty cycle

at 0% and S1 in the I

1 = I2 = 0 mA position.

*LM1578A specifications are measured using automated

test equipment. This circuit is provided for the customer’s

convenience when checking parameters. Due to possible

variations in testing conditions, the measured values from

these testing procedures may not match those of the factory.

Current Limit Sense Voltage

Drift with Temperature

DS008711-38

Current Limit Response Time

for Various Over Drives

DS008711-39

Current Limit Sense Voltage

vs Supply Voltage

DS008711-40

Supply Current

DS008711-41

Supply Current

DS008711-42

Collector Current with

Emitter Output Below Ground

DS008711-43

5

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