UCC27211: is there a full-bridge drive recommendation with similar functions?

Hi  Alex；

I am really gratefully for your reply,  Our circuits have high requirements for the layout board，We have  look TPS51601 and UCC27211,  but they are  all External MOS，So,is there another one whitch internal MOS,,can I use a  motor driver Implement this function？

Hello Aiwen,

Alex Weaver is out today. 

Technically, the output stages of our drivers are power MOSFETs, and I have seen them used in push-pull configurations like this if the power requirement is low enough (usually under 2W for bias supplies). 

Here is an example of how it would be connected. Each output stage has a pullup and pulldown FET, and therefore forms a full-bridge. 

Like you say though, many of TI's motor drivers integrate the power stage FETs into the driver, and are therefore more powerful. If you would rather pursue that option, I can send the thread to the motor driver's team. This option can sustain a higher power. 

Thanks,

Alex M.

Hi Alex M;

Which document is this figure in? I don't see this graph in the data sheet。This chip does not have a built-in MOS, directly drive the transformer like this?

Hi Aiwen,

It will likely be in a document that hasn't released yet. Here is an image in Fundamentals of Gate driver circuits that shows a similar topology:

This is for gate drive, but it is possible to rectify the secondary for a floating power supply.

Here is a driver's output stage, the power FETs are optimized to deliver peak current during switching, rather than to conduct large currents in a DC state. The DC RDSon of these FETs are about 5ohms and 0.5ohms for pullup and pulldown respectively. This is probably much higher resistance than a motor driver IC with a built-in power stage, but is still able to handle low-power applications. So yes, you could drive a small transformer directly with a gate driver IC, as long as the primary current required is below around 100-200mA in this case.

Thanks,

Alex M.

Hi  Alex M;

 you mean UCC27624 also needs external MOS? Is there a way  with  internal MOS or not to use an external MOS?Due to my customer's PCB board structure limitations, MOS can not be placed here, so we must choose a built-in MOS driver to save PCB space, 27624 will still use  external  MOS in the output stage, if so, Could  you please recommend the internal MOS driver or send the thread to the motor driver's team?

Hello,

If I understand correctly, you have a 5V power supply?  DRV8210 could be one option to meet this.

Regards,

Ryan

Hi Ryan;

Thanks for your reply, it`s really  helpful to me ,in  addition, Are there any recommendations for using motor drives to drive UV lamps reference designs?Can I follow the reference design of the drive motor directly? Is there anything else to pay attention to？

Hi ,

Thank you for your question. Ryan is OoO on Friday. Please expect his reply on early of next week.

regards

Shinya