Rainbow-electronics MAX1543 Manual do Utilizador descarregar pdf (Página 8)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

= 3.3V, V

MAIN

= 8V, f

OSC

= 1.2MHz, T

= +25°C, unless otherwise noted.)

STEP-UP REGULATOR

PULSED LOAD-TRANSIENT RESPONSE

MAX1542 toc16

10µs/div

MAIN

1A/div

500mA/div

MAIN

100mV/div

AC-COUPLED

L = 4.7µH

COMP

= 120kΩ

COMP

= 470pF

STARTUP SEQUENCE

MAX1542 toc17

1ms/div

2V/div

MAIN

8V/div

GOFF

5V/div

COM

10V/div

HEAVY-LOAD

SOFT-START WAVEFORMS

MAX1542 toc18

2ms/div

LOAD

= 10Ω

5V/div

MAIN

5V/div

500mA/div

TIMER DELAY LATCH

RESPONSE TO OVERLOAD

MAX1542 toc19

10ms/div

2A/div

MAIN

5V/div

OUT1

5V/div

COM

20V/div

OPERATIONAL AMPLIFIER

RAIL-TO-RAIL I/O PERFORMANCE

MAX1542 toc20

100µs/div

POS1

5V/div

OUT1

5V/div

SUP

= 8V

BUFFER CONFIGURATION

OPERATIONAL AMPLIFIER

LOAD-TRANSIENT RESPONSE

MAX1542 toc21

1µs/div

OUT1

1V/div

AC-COUPLED

+50

-50

OUT1

50mA/div

BUFFER CONFIGURATION

OPERATIONAL AMPLIFIER

LARGE-SIGNAL STEP RESPONSE

MAX1542 toc22

1µs/div

POS1

500mV/div

AC-COUPLED

OUT1

2V/div

SUP

= 8V

= 10

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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