Rainbow-electronics MAX1545 Manual de usuario descargar pdf (Pagina 10)

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= 12V, V

= V

= 5V, SHDN = SKIP = V

, D0–D4 set for 1.5V (SUS = GND), S0–S1 set

for 1V (SUS = V

), OFS = GND, T

= +25°C, unless otherwise specified.)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

10 ______________________________________________________________________________________

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE (PULSE SKIPPING)

MAX1519 toc10

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

20 255 1510

0.5

1.0

1.5

2.0

2.5

3.0

030

SKIP = REF

+ I

OUTPUT OFFSET VOLTAGE

vs. OFS VOLTAGE

MAX1519 toc11

OFS VOLTAGE (V)

OUTPUT OFFSET VOLTAGE (mV)

1.50.5 1.0

-100

-50

100

150

-150

02.0

UNDEFINED

REGION

REFERENCE VOLTAGE

DISTRIBUTION

MAX1519 toc12

REFERENCE VOLTAGE (V)

SAMPLE PERCENTAGE (%)

2.0051.995

2.000

1.990 2.010

SAMPLE SIZE = 100

CURRENT-BALANCE OFFSET

VOLTAGE DISTRIBUTION

MAX1519 toc13

OFFSET VOLTAGE (mV)

SAMPLE PERCENTAGE (%)

1.25-1.25

-2.50 2.50

SAMPLE SIZE = 100

CURRENT-LIMIT THRESHOLD

DISTRIBUTION

MAX1519 toc14

CURRENT LIMIT (mV)

SAMPLE PERCENTAGE (%)

10.59.5

10.0

9.0 11.0

ILIM

= 0.20V

SAMPLE SIZE = 100

-40

0.1 10 100 10001 10,000

VOLTAGE-POSITIONING AMPLIFIER

GAIN AND PHASE vs. FREQUENCY

-20

-10

-30

MAX1519 toc15

FREQUENCY (kHz)

GAIN (dB)

PHASE (DEGREES)

180

-180

-108

-72

-36

-144

108

144

GAIN

PHASE

VPS AMPLIFIER OFFSET VOLTAGE

vs. COMMON-MODE VOLTAGE

MAX1519 toc16

COMMON-MODE VOLTAGE (V)

1 205

OFFSET VOLTAGE (µV)

100

120

140

160

180

VPS AMPLIFIER

DISABLED

INDUCTOR CURRENT DIFFERENCE

vs. LOAD CURRENT

MAX1519 toc17

LOAD CURRENT (A)

30 40

050

L(CS)

- I

L(CM)

(A)

0.2

0.4

0.6

0.8

1.0

SENSE

= 1mΩ

SKIP = V

SKIP = REF

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 42 43

MAX1519/MAX1545 1

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Rainbow-electronics MAX1545 Manual de usuario Pagina 10

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