TPS92690: Incorrect datasheet equations?

Paul Hlebowitsh

Part Number: TPS92690

On the datasheet, it looks like equation 18 and equation 20 on pages 15 and 16 on the datasheet are incorrect. Can you verify that it's supposed to be Vturn-off = 1.24*(R_ov1+Rov2)/Rov1 for equation 18 and Vturn-on=1.24*(Ruv1+Ruv2)/Ruv1 for equation 20? Unless I'm missing something big here?

over 7 years ago

0 Irwin Nederbragt over 7 years ago

TI__Mastermind 28655 points

Hello,

The equations in the datasheet look correct, same as you have them written above, the are for two different functions. One is for rising voltage, the other is for falling voltage. As voltage rises too high OVP trips, then is has to fall a certain about to turn back on. The other is opposite, as the voltage rises the part enables, then it has to drop the hysteresis to disable. One is UV the other is OV.

Regards,

0 Paul Hlebowitsh over 7 years ago in reply to Irwin Nederbragt

Prodigy 40 points

At least in the copy of the datasheet I have, the two quantities aren't added, but are instead multiplied. Link to where I'm looking: www.ti.com/.../tps92690.pdf

0 Paul Hlebowitsh over 7 years ago in reply to Paul Hlebowitsh

Prodigy 40 points

See the screenshot. There's a multiplication sign, where I think there should be an addition sign between Rov1 and Rov2.

0 Paul Hlebowitsh over 7 years ago in reply to Irwin Nederbragt

Prodigy 40 points

I don't think the equations are the same. Look at the screenshot I attached. There's a multiplication sign, where I think there should be an addition sign.

0 Irwin Nederbragt over 7 years ago in reply to Paul Hlebowitsh

TI__Mastermind 28655 points

Hello,

Yes, it should be addition

Regards,

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TPS92690: Incorrect datasheet equations?