UCC21710: OUT vs IN＋and IN－

Y.Ottey

Part Number: UCC21710

Dear TI Team

I would like to ask about UCC21710.

If you check the data sheet of UCC21710, the following figure is posted, but where does the OUT shown in this figure refer to the output?
(If you check the pins, there are OUTH and OUTL, but there is no OUT pin.)

Best Regards,

Y.Ottey

over 4 years ago

0 Don Dapkus over 4 years ago

TI__Guru**** 189401 points

Hi, That is referring to the OUTH terminal. Let us know if you have further questions.

0 Y.Ottey over 4 years ago in reply to Don Dapkus

Mastermind 6145 points

Hi Don

Thank you for your reply.

I understand that the OUT shown in the figure is OUTH.
How does OUTL work in the same IN + and IN- states as in Figures 7-1 and 7-2?

Regards,

Y.Ottey

0 Wei Zhang over 4 years ago in reply to Y.Ottey

TI__Intellectual 2061 points

Ottey, OUTH and OUTL are complementary within the recommended VDD supply range. Wish it helps.

0 Y.Ottey over 4 years ago in reply to Wei Zhang

Mastermind 6145 points

Hi Wei

Thank you for your quick reply.

"OUTH and OUTL are complementary within the recommended VDD supply range."

In other words, is it correct to recognize that OUTH and OUTL are in opposite states?
(For example, when OUTH is High, OUTL becomes Low, and when OUTH becomes Low, OUTL becomes High.)

Regards,
Y.Ottey

0 Wei Zhang over 4 years ago in reply to Y.Ottey

TI__Intellectual 2061 points

Yes, Ottey, your understanding is correct.

0 Y.Ottey over 4 years ago in reply to Wei Zhang

Mastermind 6145 points

Hi Zanq, Don

Thank you for your reply.

I would like to ask adding question.

Our customers are asking if there is a truth table that shows the relationship between Input and Output of UCC21710.
From Figures.7-1 and 7-2, I think the truth table will be as follows, but please tell me about the remaining part (blank part).
(H = High L = Low)

Regards,

Y.Ottey

0 Andy Robles over 4 years ago in reply to Y.Ottey

TI__Genius 13760 points

Hi Ottey,

In order for OUTH to be asserted high the signal on IN+ has to be high and IN- has to be low. For all the other conditions the output will be low.

Best regards,

Andy Robles

0 Don Dapkus over 4 years ago in reply to Andy Robles

TI__Guru**** 189401 points

Hi, Ottey,

I think this diagram will help explain it better for you:

When OUTH is commanded on, OUTH will be effectively shorted to VDD. In this case, the OUTL output will be in a high-impedance state as the gate of ROL will be at zero volts.

Conversely, when OUTL is commanded on, OUTL will be effectively shorted to GND. In this case, the OUTH output will be in a high-impedance state as the gate to source voltage on ROH will be zero, hence it will be off in this case.

The reason we configure it like this is OUTH and OUTL are eventually tied together to drive the gate of a single power switch:

I hope these diagrams clarify the concept for you.

Power management

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UCC21710: OUT vs IN＋and IN－