Rainbow-electronics MAX1842 Manual do Utilizador descarregar pdf (Página 6)

MAX1742/MAX1842

1A/2.7A, 1MHz, Step-Down Regulators with

Synchronous Rectification and Internal Switches

6 _______________________________________________________________________________________

MAX1742

STARTUP AND SHUTDOWN

INPUT

1A/div

OUTPUT

1V/div

2V/div

MAX1742 toc06

1ms/div

SHDN

5V/div

MAX1742

LOAD-TRANSIENT RESPONSE

OUTPUT

AC-COUPLED,

50mV/div

0.5A/div

MAX1742 toc07

10µs/div

MAX1742

LINE-TRANSIENT RESPONSE

INPUT

2V/div

OUTPUT

20mV/div

AC-COUPLED

MAX1742 toc08

20µs/div

OUT

= 1A, V

OUT

= 1.5V, R

TOFF

= 100kΩ, L = 6µH

150

100

200

250

300

350

400

450

500

100

021 3456

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX1742 toc09

(V)

NO-LOAD SUPPLY CURRENT, I

+ I

(µA)

SHUTDOWN SUPPLY CURRENT, I

+ I

(nA)

NO LOAD

SHUTDOWN

Typical Operating Characteristics (continued)

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

1.0

0.5

2.0

1.5

3.0

2.5

3.5

4.5

4.0

5.0

0 100 150 20050 250 300 350 450400 500

OFF-TIME vs. R

TOFF

MAX1742 toc10

TOFF

(kΩ)

OFF

(µs)

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

MAX1742/MAX1842 1

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