TPS24741: Question about TPS24741

Babak Manou

Part Number: TPS24741

Hello,

I am planning to use TPS24741 for my application and I have a couple of questions:

1- The input to my circuit (which this IC is part of it) is 12V DC. I have two lines inputs: 1- onboard power 2- Shore power. Both powers are provided by 3s batteries so their voltage may drop lower than 10V. I would like my circuit to connect to shore power even if its voltage is lower than onboard battery. In other word, if shore power is presented, always connect to shore power regardless of its voltage. Is it possible to do this with this IC?

2- My system is rated for about 7amps (at 12V) continues current and about 25amps max current. Is this IC capable of handling that power?

3- I am planning to use the recommended values given in Figure 45 and the schematic given in Figure 60. Is it a good idea or I need to recalculate them for my design?

4- The AUX schematic of Figure 60 is given in Figure 61, but not the main circuit! Shall I use the same schematic given in Figure 45 for Main supply?

5- In Figure 60, it is not clear to me what is Hotswap boxes? Are they inside TPS24741 chip or they are a different circuit?

Thanks,

Babak

over 6 years ago

0 Praveen GD over 6 years ago

TI__Guru 57737 points

Hi Babak,

Please see my response to your questions below,

1. Yes, it is possible to implement that with this IC. You need to operate TPS2474x in Priority Muxing configuration. The OV pin of the TPS2474x can be used to keep the Auxiliary Hot Swap OFF unless the voltage on MAIN falls below a certain threshold.

2. This IC is just a controller. The actual current flows through the MOSFET which are controlled by TPS24741. So, YES you can use this IC for 25A max current.

3. It is not a good practice to use the same values of datasheet example in your design as your specifications can be different from that of design example. We have a design calculator available at http://www.ti.com/product/TPS24741/toolssoftware. Please use the design calculator to come up with the right component selection for your design. Training videos in the below links will help understand on how to use the design calculator.

https://training.ti.com/node/1133677

https://training.ti.com/node/1133673

https://training.ti.com/node/1133664

https://training.ti.com/node/1133681

4.The schematic for the AUX and Main Circuit will be same except for the OV pin circuit. Figure 61 shows how to use a resistor divider and realise the Priority Muxing function.

5. As I mentioned earlier, this pert is just a controller. it has the control logic integrated for Hotswap and ORing. The actual Hotswap FET and ORing FET's are external to the device.

0 Praveen GD over 6 years ago in reply to Praveen GD

TI__Guru 57737 points

Hi Babak,

Do you have anymore questions? If not, can we close this thread ?

0 Babak Manou over 6 years ago in reply to Praveen GD

Intellectual 420 points

Thanks for the info Praveen. I need to go through documents again and I will get back to you in case of questions. Thanks

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TPS24741: Question about TPS24741