Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 10)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

10 ______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1. V

= 12V, V

= 5V, SUS = SKIP = GND, SHDN = V

, V

SUSV

= 0.80V, T

= +25°C, unless otherwise specified.)

OUTPUT OFFSET VOLTAGE

DISTRIBUTION

MAX8707 toc10

OUTPUT OFFSET VOLTAGE (mV)

SAMPLE PERCENTAGE (%)

1-1-3

-5 53

SAMPLE SIZE = 100

1.550V

0.800V

VPS TRANSCONDUCTANCE

DISTRIBUTION

MAX8707 toc11

TRANSCONDUCTANCE (µS)

SAMPLE PERCENTAGE (%)

203201199197

195 205

SAMPLE SIZE = 100

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0.6

0 5 10 15 20 25

CURRENT-SENSE VOLTAGE DIFFERENCE

vs. LOAD CURRENT

MAX8707 toc12

LOAD CURRENT (A)

CURRENT-SENSE DIFFERENCE (mV)

STARTUP WAVEFORM

(NO LOAD)

MAX8707 toc13

A. SHDN, 5V/div

B. DRSKP, 10V/div

C. REF, 2V/div

D. OUT, 1V/div

E. VROK, 10V/div

F. DL1, 10V/div

G. INDUCTOR CURRENT

), 10A/div

200µs/div

3.3V

STARTUP WAVEFORM

(20A LOAD)

MAX8707 toc14

A. SHDN, 5V/div

B. DRSKP, 10V/div

C. REF, 2V/div

D. OUT, 1V/div

E. VROK, 10V/div

F. DL1, 10V/div

G. INDUCTOR CURRENT

), 10A/div

200µs/div

3.3V

SHUTDOWN WAVEFORM

(NO LOAD)

MAX8707 toc15

A. SHDN, 5V/div

B VROK, 10V/div

C. OUT, 1V/div

D. DL1, 10V/div

E. INDUCTOR CURRENT

), 10A/div

200µs/div

3.3V

1.3V

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 36 37

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