Don't need use the ch2 at TPS542951

masa0301

Intellectual 960 points

Other Parts Discussed in Thread: TPS542951, TPS54227

My coustomer want to use the TPS542951.

But coustomer don't need ch2

In this case below pin how to connect.

I already proposal TPS54227. But the coustomer want a same board that has a design previously.

This design can not EN2 is low. Because EN1 and EN2 is very near,,,

[1] VIN2：13V
[2] BST2：
[3] SW2：
[4] PGND：
[5] SS2：
[6] VFB2：

Best regards,

masa

over 10 years ago

0 JohnTucker over 10 years ago

TI__Guru**** 191445 points

I'm not sure about that. No one has ever asked about that situation. If they are using the same board, there will already be connections to CH2. I'm not sure what you mean about: "This design can not EN2 is low. Because EN1 and EN2 is very near,,,". Can you clarify?

0 JohnTucker over 10 years ago in reply to JohnTucker

TI__Guru**** 191445 points

I tested this in the lab. You should open pins VFB2, SS2, PGND2, SW2, VBST2 and VIN2. Short EN2 to GND, otherwise the device will still switch.

0 Miguel Bento over 9 years ago in reply to JohnTucker

Intellectual 640 points

Hi,

I´m trying to use TPS542951. I use the circuit example of the datrasheet. When I tunr the power on and measure the output of the TPS542951, I don´thave the voltage I want, it is nearly zero. I measured the voltage at pin VREG5V, and the voltage is about 1.5V... Do you have any idea of what is going on?

Best Regards,

Miguel

Power management

Power management forum

Don't need use the ch2 at TPS542951