Rainbow-electronics MAX17480 Bedienungsanleitung PDF herunterladen (Seite 47)

MAX17480

AMD 2-/3-Output Mobile Serial

VID Controller

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5) Make the DC-DC controller ground connections as

shown in the standard application circuit (Figure 2).

This diagram can be viewed as having three sepa-

rate ground planes: input/output ground, where all

the high-power components go; the power ground

plane, where the PGND, V

bypass capacitor,

and driver IC ground connection go; and the con-

troller’s analog ground plane, where sensitive ana-

log components, the MAX17480’s AGND pin, and

bypass capacitor go. The controller’s analog

ground plane (AGND) must meet the power ground

plane (PGND) only at a single point directly beneath

the IC. The power ground plane should connect to

the high-power output ground with a short, thick

metal trace from PGND to the source of the low-side

MOSFETs (the middle of the star ground).

6) Connect the output power planes (V

CORE

, V

OUT3

and system ground planes) directly to the output

filter capacitor positive and negative terminals with

multiple vias. Place the entire DC-DC converter

circuit as close to the CPU as is practical.

DDNB

CORE1

CORE0

OUT

INDUCTOR

POWER

GROUND

INDUCTOR

OUT

SPLIT CORE

CPU SOCKET

AGND PIN

CONNECT THE EXPOSED

PAD TO POWER GND

USING MULTIPLE VIAS

VCC

VDD

IN3

OUT3

NTC

CSP

CSN

CSP

CSN

KELVIN-SENSE VIAS TO

INDUCTOR PAD

KELVIN-SENSE VIAS UNDER THE INDUCTOR

(REFER TO EVALUATION KIT)

INDUCTOR DCR SENSING

Figure 15. PCB Layout Example

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