UCD3138128 datasheet(69/80 Pages) TI

69 / 80 page

UCD3138128, UCD3138A64

www.ti.com

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

11 Power Supply Recommendations

•

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

•

BP18 should have a 1 µF capacitor.

12 Layout

12.1 IC Grounding and Layout Guidelines

•

Two grounds are recommended: AGND (analog) and DGND (digital)

–

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

•

RSVD must be tied to BP18.

•

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 DGND. If the RESET pin is unused it is

recommended to tie the pin to 3.3 V through 220

Ω.

•

All filter and decoupling capacitors should be placed close to UCD3138x 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 UCD3138x’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. Alternatively unused GPIOs can be

configured to outputs and set to a logic level of 0.

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