Rainbow-electronics MAX1718 Manual do Utilizador descarregar pdf (Página 8)

MAX1718

Notebook CPU Step-Down Controller for Intel

Mobile Voltage Positioning (IMVP

II)

8 _______________________________________________________________________________________

100µs/div

SHUTDOWN WAVEFORM

(PWM MODE, NO LOAD)

MAX1718 toc13

B0A

A = V

OUT

, 1V/div

B = INDUCTOR CURRENT, 10A/div

C = SKP/SDN, 5V/div

100µs/div

SHUTDOWN WAVEFORM

(PWM MODE, I

OUT

= 12A)

MAX1718 toc14

B0A

A = V

OUT

, 1V/div

B = INDUCTOR CURRENT, 10A/div

C = SKP/SDN, 5V/div

Typical Operating Characteristics (continued)

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

= V

= SKP/SDN = 5V, V

OUT

= 1.25V, T

= +25°C, unless otherwise noted.)

40µs/div

DYNAMIC OUTPUT VOLTAGE TRANSITION

(PWM MODE)

MAX1718 toc12

B0A

A = V

OUT

, 500mV/div, AC-COUPLED

B = INDUCTOR CURRENT, 10A/div

C = VGATE, 5V/div

D = SUS, 5V/div

OUT

= 0.7V TO 1.25V

OUT

= 3A, R

TIME

= 62kΩ

0.750

0.800

0.775

0.850

0.825

0.900

0.875

0.925

0.5 0.9 1.10.7 1.3 1.5 1.7 1.9

OFFSET FUNCTION SCALE FACTOR

vs. DAC SETTING

MAX1718 toc15

DAC SETTING (V)

POS-NEG SCALE FACTOR

MEASURED

THEORETICAL

1.00

1.10

1.05

1.25

1.20

1.15

1.40

1.35

1.30

1.45

-300 -100-200 0 100 200

OUTPUT VOLTAGE

vs. POS-NEG DIFFERENTIAL

MAX1718 toc16

POS-NEG (mV)

OUTPUT VOLTAGE (V)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 34 35

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