UCD3138 datasheet(68/89 Pages) TI1

68 / 89 page

2 .2

1 .0

BP18

DGND

V33D

UCD3138

SLUSAP2G – MARCH 2012 – REVISED SEPTEMBER 2016

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Product Folder Links: UCD3138

Layout

9.1

Layout Guidelines

•

TI recommends two grounds: AGND (analog) and DGND (digital).

–

AGND plane should be on a different layer than DGND, and right under the UCD3138 device.

–

UCD3138 power pad should be tied to AGND plane by at least 4 vias.

–

AGND plane should be just large enough to connect to all required components.

–

Power ground (PGND) can be independent or combined with DGND.

–

The power pad of the driver IC should be tied to DGND.

•

Both 3.3VD and 3.3VA should have a local 4.7-µF capacitor placed as close as possible to the device

pins

•

BPCAP decoupling (2.2 µF typically) MUST be connected to DGND

•

All analog signal filter capacitors should be tied to AGND

–

If the gate driver device, such as UCD27524 or UCD27511/7 driver is used, the filter capacitor for

the current sensing pin can be tied to DGND for easy layout

•

All digital signals, such as GPIO, PMBus and PWM are referenced to DGND.

•

The RESET pin capacitor (0.1 µF) should be connected to either DGND or AGND locally. TI

recommends a 10-k

Ω pullup resistor to 3.3 V.

•

All filter and decoupling capacitors should be placed close to UCD3138 as possible

–

Resistor placement is less critical and can be moved a little further away

•

The DGND and AGND net-short resistor MUST be placed right between one UCD3138’s DGND pin

and one AGND pin. Ground connections to the net short element should be made by a large via (or

multiple paralleled vias) for each terminal of the net-short element.

•

If a gate driver device such as UCC27524 or UCC27511/7 is on the control card and there is a PGND

connection, a net-short resistor should be tied to the DGND plane and PGND plane by multiple vias. In

addition the net-short element should be close to the driver IC.

•

Configure all unused GPIO as inputs and connect them to ground.

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