DLPA3000 Thermal Pad

as DLPA3000 spec & SLMA002 define:

1. Thermal pad:12.00×12.00;

2. Exposed thermal pad:6.00×6.00;

3. VIA 7×7;

Detail footprint as attachment;

But to my opinion, exposed thermal pad 12.00×12.00 has good thermal dissipation than 6.0×6.0;

The reason for TI suggestion to Choosing exposed thermal pad 6.0×6.0 is ….？？

MengAo Zeng：

The 12mm x 12 mm is not the thermal pad dimensions.  It is the distance between the first and last pin on the side of the die.  The first drawing is a generic drawing for all HTQFP devices, and it has a note that says to refer to the datasheet for the pad dimensions.  The pad dimensions are specified in the second drawing, which is the specific drawing for our package. 

HZ_Xu：

回复 MengAo Zeng:

dear sir,

Thanks for your request. 

SLMA002 says vias is good to thermal.

Adding  vias for DLPA3000 footprint is better??

MengAo Zeng：

回复 HZ_Xu:

Yes. The vias will be helpful to thermal design. Thanks.

HZ_Xu：

回复 MengAo Zeng:

dear sir,

PICO Projector based on DLPA3438 & DLPA3000,

if DLPA3000 analog sensor signal pins are not used, left them floating or ………….??

I can't find it in data sheet;

MengAo Zeng：

回复 HZ_Xu:

If you didn't connect light sensor or temperature sensor with DLPA3000, the sensor related pins can be left open or unconnected. Please find more details on DLPA3000 datasheet (Page37).

Bill Chen：

回复 MengAo Zeng:

dear sir,

according to DLPA3005 design sch–2514006_20141230,as image shows, adds two diodes for PWR1,2,5,6,7;

Need to add diodes for DLPA3000??

MengAo Zeng：

回复 Bill Chen:

No need diodes for DLPA3000 PWR1/2/5/6/7 converters. But PWR5/6/7 should not be used currently. Please refer to DLPA3000 datasheet for details.

HZ_Xu：

回复 MengAo Zeng:

1. No need diodes for DLPA3000 PWR1/2/5/6/7 converters.

==>if possible, May I know the reason for diodes for DLPA3005??

2. But PWR5/6/7 should not be used currently.

==>what does this means?? software is not ready to control this??

3. if one of PWR1,2,5,6,7  powers is not used, may NC parts for cost down??

==>

MengAo Zeng：

回复 HZ_Xu:

Yes. The PWR5/6/7 pins of DLPA3000 can be left open/unconnected.

Bill Chen：

回复 MengAo Zeng:

DLPA3000 data sheet Page 9  shows:

Typical Application: 6 A LED, Internal FETs,

DMD type TRP.

ACTIVE mode, all VIN pins combined, DMD, ILLUMINATION and PWR1,2 enabled, PWR3,4,5,6,7 disabled.

 

==>if this means, only PWR1,2 can be used while using DMD Type TRP??