Rainbow-electronics MAX1717 Manual do Utilizador descarregar pdf (Página 9)

MAX1717

Dynamically Adjustable, Synchronous

Step-Down Controller for Notebook CPUs

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100µs/div

STARTUP WAVEFORM

MAX1717 toc28

A = V

OUT

, 1V/div

B = INDUCTOR CURRENT, 10A/div

C = SKP/SDN, 5V/div

300kHz VOLTAGE POSITIONED,

CIRCUIT 2, PWM MODE,

NO LOAD

100µs/div

STARTUP WAVEFORM

MAX1717 toc29

A = V

OUT

, 1V/div

B = INDUCTOR CURRENT, 10A/div

C = SKP/SDN, 5V/div

300kHz VOLTAGE POSITIONED,

CIRCUIT 2, I

OUT

=12A

50µs/div

DYNAMIC OUTPUT VOLTAGE TRANSITION

MAX1717 toc30

300kHz STANDARD APPLICATION, CIRCUIT 1,

PWM MODE, V

OUT

= 1.35V TO 1.6V, I

OUT

= 0.3A,

TIME

= 120kΩ

A = V

OUT

, 200mV/div, AC-COUPLED

B = INDUCTOR CURRENT, 10A/div

C = VGATE, 5V/div

D = A/B, 5V/div

50µs/div

DYNAMIC OUTPUT VOLTAGE TRANSITION

MAX1717 toc31

300kHz STANDARD APPLICATION, CIRCUIT 1,

PWM MODE, V

OUT

= 1.35V TO 1.6V,

OUT

= 12A, R

TIME

= 120kΩ

A = V

OUT

, 200mV/div, AC-COUPLED

B = INDUCTOR CURRENT, 10A/div

C = VGATE, 5V/div

D = A/B, 5V/div

20µs/div

DYNAMIC OUTPUT VOLTAGE TRANSITION

MAX1717 toc32

A = V

OUT

, 200mV/div, AC-COUPLED

B = INDUCTOR CURRENT, 10A/div

C = VGATE, 5V/div

D = A/B, 5V/div

1000kHz +5V, CIRCUIT 4,

PWM MODE, V

OUT

= 1.35V TO 1.6V,

OUT

= 0.3A, R

TIME

= 51kΩ

40µs/div

OUTPUT OVERLOAD WAVEFORM

MAX1717 toc33

A = V

OUT

, 500mV/div

B = INDUCTOR CURRENT, 10A/div

300kHz VOLTAGE POSITIONED, CIRCUIT 2,

PWM MODE

Typical Operating Characteristics (continued)

(Circuit of Figure 1, components of Table 1, V+ = +12V, V

= V

= SKP/SDN = +5V, V

OUT

= 1.6V, T

= +25°C, unless otherwise noted.)

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