Rainbow-electronics MAX776 Manual do Utilizador descarregar pdf (Página 7)

MAX774/MAX775/MAX776

-5V/-12V/-15V or Adjustable,

High-Efficiency, Low I

Inverting DC-DC Controllers

_______________________________________________________________________________________ 7

__________________________________________Typical Operating Characteristics

= +25°C, unless otherwise noted.)

CIRCUIT OF FIGURE 2

V+ = 6.5V, I

LOAD

= 1A, V

OUT

= -5V

A: OUTPUT RIPPLE, 200mV/div

B: EXT WAVEFORM, 10V/div

C: INDUCTOR CURRENT, 2A/div

OPERATING WAVEFORMS

10µs/div

CIRCUIT OF FIGURE 2

OUT

= -5V, V+ = 4.7V

LOAD

= 1.05A (1A/div)

INDUCTOR CURRENT NEAR FULL LOAD

20µs/div

1A/div

CIRCUIT OF FIGURE 2

LOAD

= 300mA, V

OUT

= -5V

V+ = 8V, L = 22µH

CONTINUOUS CONDUCTION

AT ONE-HALF CURRENT LIMIT

20µs/div

1A/div

CIRCUIT OF FIGURE 2

V+ = 6V, I

LOAD

= 1A, V

OUT

= -5V

A: SHUTDOWN PULSE, 0V TO V+, 5V/div 

B: V

OUT

, 2V/div

ENTRY/EXIT FROM SHUTDOWN

2ms/div

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

MAX774/MAX775/MAX776 1
-5V/-12V/-15V or Adjustable 1
High-Efficiency, Low I 1
Inverting DC-DC Controllers 1

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