MAX5037EVKIT【PDF 7/13 页】EVAL KIT FOR MAX5037

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Sheet目录341

3页 4页 5页 6页 [7页]8页 9页 10页 11页

MAX5037 Evaluation Kit

where R24 and R23 are the input and feedback resistors

of the voltage-error amplifier, GC is current-loop gain,

and RS is the current-sense resistor. See Figure 4 and

Figure 5 for the output voltage vs. the R CNTR (R21).

Applying the voltage-positioning window at different

1.90

1.85

OUTPUT VOLTAGE

vs. I LOAD AND R CNTR

R CNTR = 50k?

VRM voltage settings requires an additional element

proportional to the VID setting. The resistor from REG

(pin 15) to SGND provides a current proportional to the

1.80

1.75

R CNTR = 100k?

VID setting (Figure 18). Calculate the resistor from REG

to SGND as:

R22 = R23

1.70

1.65

1.60

R CNTR = 200k?

V IN = +12V

VID SETTING = +1.75V

R CNTR = ∞

5 10 15 20 25 30 35 40 45 50 55

I LOAD (A)

where R23 is the feedback resistor of the voltage-error

amplifier. The voltage on REG is internally regulated to

the programmed VID output voltage.

Figure 4. Output Voltage vs. I LOAD and R CNTR

Note that in the case of VID voltage setting equal to

V COREMAX at I OUT = 0 (no load), R21 is calculated

from the above equation as infinity. Because the VID

1.60

OUTPUT VOLTAGE

vs. I LOAD AND R CNTR

setting has an output voltage set-point accuracy speci-

fication of 0.8%, the output voltage may exceed the

V CCMAX limit. For systems requiring V CCMAX as an

absolute maximum voltage at I OUT = 0 (no load), R REG

can be recalculated using the following equation:

1.55

1.50

1.45

1.40

R CNTR = 50k?

V IN = +12V

VID SETTING = +1.4V

R CNTR = 100k?

R 24 + R 23 × ? 1 ?

R 22 =

R 24 × R 23

? V COREMAX ?

VID

1.35

1.30

1.25

R CNTR = 200k?

R CNTR = ∞

1.20

The voltage positioning of 120mV at 52A load is set in

the MAX5037 EV kit. See Figure 6 for the VRM output

5 10 15 20 25 30 35 40 45 50 55

I LOAD (A)

load line for voltage positioning at a different ratio of R F

Figure 5. Output Voltage vs. I LOAD and R CNTR

(R23) and R IN (R24).

OUTPUT VOLTAGE vs. OUTPUT CURRENT

AND ERROR AMP GAIN (R F / R IN )

1.85

V IN = +12V

V COREMAX ≤ VID

V COREMAX - ? V OUT /2

1.80

R f / R IN = 15

V OUT = +1.8V

R f / R IN = 12. 5

1.75

V COREMAX - ? V OUT

1.70

R f / R IN = 7.5

1.65

R f / R IN = 10

NO LOAD

1/2 LOAD

LOAD (A)

FULL LOAD

1.60

5 10 15 20 25 30 35 40 45 50 55

I LOAD (A)

Figure 3. VRM Loadline with V COREMAX = VID at No Load

Figure 6. Output Voltage vs. Output Current and Error AMP

GAIN (R F /R IN )

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