IRVRM2 datasheet(7/8 Pages) IRF

7 / 8 page

IRVRM2

Dynamic Performance (continued)

Rectifier

International

Fig 23. Rising Input current without L2

Fig 25. Falling Input Current without L2

Fig 24. Input di/dt Test Circuit

Fig 21. Rising Input Current Waveform

Input di/dt During Transient Load

Intel’s specification recommends a

maximum input di/dt during transient load

of 0.1A/µs. IRVRM2 readily meets this

specification at rising and falling edges of

input current.

Fig 22. Falling Input Current Waveform

Transient measurements were taken with

1µH of total line inductance between the

input power supply and IRVRM2.

This

approximately

simulates

total

path

inductance from the silver box to the VRM

board in a typical computer system.

IRVRM2 has an input inductance of 0.5µH

(L2) to limit input di/dt to the Intel

recommended 0.1A/µs.

Transient Load At VRM2

Performance at 100kHz is dominated by

stray output inductance and resistance.

These are a combination of output capacitor

ESL & ESR and board + connector

inductance & resistance.

Performance at 100Hz exhibits the same rise

& fall characteristics as at 100kHz. Setting

the oscilloscope so as to see the whole

waveform,

however,

reveals

any

undersirable loop characteristics.

shown, IRVRM2 is very well behaved at

both 100Hz and 100kHz.

Fig 19. 100 Hz Transient Output Voltage

Fig 20. 100 kHz Transient Output Voltage

Limit

100Hz

100kHz

Min

2.66V

2.706

2.670

Max

2.94V

2.842

2.834

Limit

Rising Falling

L2 = 0.5µH

.1A/µs

0.074

0.087

L2 = 0.0µH

.1A/µs

0.09

0.108

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