UCD3138RMHT datasheet(58/78 Pages) TI1

58 / 78 page

2 .2

1 .0

BP18

DGND

V33D

UCD3138

SLUSAP2F – MARCH 2012 – REVISED NOVEMBER 2013

www.ti.com

IC Grounding and Layout Recommendations

•

Two grounds are recommended: 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 4.7µF 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 (0.1µF) should be connected to either DGND or AGND locally. A 10k

Ω pull-

up resistor to 3.3V is recommended.

•

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.

IC Grounding and Layout Recommendations

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