DLP3030PGUQ1EVM: What is the function of reference number D4

?? ?

Part Number: DLP3030PGUQ1EVM

HI：

Referring to page 9 of the schematic diagram. Number D4 uses ST's STPS1045BY-TR. What is the main function of this material here? Why is such a large current needed? And the following D2/D3/D5 do not need such a large current?

over 1 year ago

0 Alexander Chan over 1 year ago

TI__Expert 7070 points

Hi,

It is a fly-back diode to protect the LED driver circuitry and PFET Q3. When the LED_ON signal (coming from pin 19) of the TMS320F28023PTQ is turned off, L2 will keep current flowing and it flips from coming from Q3 to coming from D4.

The other 3 diodes do not see the drive current and thus don't have a high current rating.

Thanks,

Alex Chan

0 ?? ? over 1 year ago in reply to Alexander Chan

Prodigy 140 points

Thank you very much!

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DLP3030PGUQ1EVM: What is the function of reference number D4