UCC256403: In the case of unused BW pin

Satoshi

Guru 19485 points

Part Number: UCC256403
Other Parts Discussed in Thread: UCC256303

Can UCC256403 use the condition of unused BW pin connect to GND?

Below E2E thread is described UCC256303 can set BW pin to GND, but UCC256403 is add BMTH and BMTL sensing.

I wonder about BW pin of UCC256403 set to GND the same as UCC256303, OK or not.

Best regards,

Satoshi

0 Yunsheng Qu over 3 years ago

Hi, Satoshi

It is OK to short BW pin of UCC256403 to GND. Then BMTL/BMTH is set as 0.6.

Yunsheng

0 Satoshi over 3 years ago in reply to Yunsheng Qu

Guru 19485 points

Hi Yunsheng

Thank you for reply,

Sorry for additional question;

If BW pin set to GND, Why BMT Low/High ratio become 0.6?

Please let me know about the relation of below application note table-4 (page-7), the principle of BW: GND become user option: 5 or 6.

Best regards,

Satoshi

0 Yunsheng Qu over 3 years ago in reply to Satoshi

Satoshi,

the result of shorting BW to GND is not specify in datasheet and the application note you are referring to.

Actually, shorting BW to Gnd has same result of connecting 4.45kohm~4.732kohm to Gnd. The result is User option 6.

Yunsheng

0 Satoshi over 3 years ago in reply to Yunsheng Qu

Guru 19485 points

Hi Yunsheng

Thank you for confirming,

Could you disclose internal circuit information for BW to GND, with resister value?

Or, is these information confidential?

Best regards,

Satoshi

0 Yunsheng Qu over 3 years ago in reply to Satoshi

Satoshi,

this information is not specified in datasheet. if customer has any concern, then I suggest connecting 4.45kohm~4.732kohm from BW to Gnd.

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