Rainbow-electronics MAX1623 Uživatelský manuál stáhnout pdf (Strana 5)

MAX1623

_______________________________________________________________________________________ 5

3A, Low-Voltage, Step-Down Regulator with

Synchronous Rectification and Internal Switches

1ms/div

START-UP AND SHUTDOWN TRANSIENT

MAX1623 TOC08

= 5V, V

OUT

= 3.3V, I

LOAD

= 3A,

WAVEFORM AVERAGED

A: V

OUT

, 2V/div

B: I

, 1A/div

C: V

SHDN

, 5V/div

LOAD-TRANSIENT RESPONSE

(FBSEL = REF)

MAX1623 TOC10

LOAD

0 to 3A

OUT

50mV

AC-COUPLED

f = 300kHz

20µs/div

LINE-TRANSIENT RESPONSE

MAX1623 TOC12

= 4.5V

to 5.5V

AC-COUPLED

(1V/div)

OUT

= 3.3V

AC-COUPLED

OUT

= 1.5A

(20mV/div)

20µs/div

LOAD-TRANSIENT RESPONSE

(FBSEL = REF)

MAX1623 TOC11

LOAD

0 to 2A

OUT

50mV

AC-COUPLED

f = 300kHz

20µs/div

____________________________ Typical Operating Characteristics (continued)

(Circuit of Figure 2, T

= +25°C, unless otherwise noted.)

LINE-TRANSIENT RESPONSE

MAX1623 TOC13

= 4.5V

to 5.5V

AC-COUPLED

(1V/div)

OUT

= 3.3V

AC-COUPLED

OUT

= 100mA

(20mV/div)

20µs/div

1ms/div

START-UP AND SHUTDOWN TRANSIENT

MAX1623 TOC09

= 5V, V

OUT

= 3.3V, I

LOAD

= 2A,

WAVEFORM AVERAGED

A: V

OUT

, 2V/div

B: I

, 1A/div

C: V

SHDN

, 5V/div

1 2 3 4 5 6 7 8 9 10 11 12

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