MAX8742 Просмотр технического описания (PDF) - Maxim Integrated

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MAX8742

500kHz Multi-Output Power-Supply Controllers with High Impedance in Shutdown

Maxim Integrated 

500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

Typical Operating Characteristics (continued)

(Circuit of Figure 1, Table 1, 6A/500kHz components, TA = +25°C, unless otherwise noted.)

REF OUTPUT VOLTAGE

vs. OUTPUT CURRENT

2.505

VIN = 15V

ON3 = ON5 = 0

2.500

2.495

2.490

2.485

0

1

2

3

4

5

6

OUTPUT CURRENT (mA)

5V LOAD-TRANSIENT RESPONSE

MAX8741/42 toc11

10V

0

5A

0

20μs/div

VIN = 8V, IOUT = 1A TO 5A

5V OUTPUT

5OmV/div

AC-COUPLED

VLX5

10V/div

ILX5

5A/div

3.3V LOAD-TRANSIENT RESPONSE

MAX8741/42 toc12

10V

0

5A

0

20μs/div

VIN = 8V, IOUT = 1A TO 5A

3.3V OUTPUT

5OmV/div

AC-COUPLED

VLX3

10V/div

ILX3

5A/div

STARTUP WAVEFORMS

MAX8741/42 toc13

RUN

5V/div

0

3.3V OUTPUT

2V/div

0

TIME

2V/div

0

5V OUTPUT

0

5V/div

2ms/div

SEQ = VL, O.O1μF CAPACITOR ON-TIME

SHUTDOWN WAVEFORMS

MAX8741/42 toc14

5V

3.3V

0

0

0

500μs/div

RLOAD3 = 5Ω, RLOAD5 = 5Ω

5V OUTPUT

2V/div

3.3V OUTPUT

2V/div

DL3

5V/div

DL5

5V/div

SHDN

5V/div

8 _______________________________________________________________________________________

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