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TPS482H85-Q1: Can VOUT1 and 2 be tied together to increase output current twice?

Kazuya Nakai59
Guru 21525 points
Part Number: TPS482H85-Q1
Other Parts Discussed in Thread: TPS4H160-Q1

Tool/software:

Hello guys,

One of my customers is considering using TPS482H85-Q1 for their next products.

At this moment, they have the following questions.
Could you please give me your reply?

Q1.
Can VOUT1 and 2 be tied together to increase output current twice? 

Q2.
The device datasheet says on page1 "The TPS4H82H85-Q1 device is fully protected
dual channel smart high-side switch with two integrated 85mΩ NMOS power FETs
intended for 24V and 48V automotive supply systems".

They want to use TPS482H85-Q1 with VBB=12V+/-10%.
Is there any performance change or concerning point?

Q3.
They are considering the following 3 devices.
TPS482H85A-Q1
TPS482H85B-Q1
TPS482H85C-Q1

Could you please give me these devices RTM timing?

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Expert 7621 points

    Hi Kazuya,

    Sorry for the delay, I will get back to you soon.

    Thanks,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Guru 21525 points

    Hi Rishika,

    Thank you very much for your reply.

    Yes. I will wait for your next reply.

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Expert 7621 points

    Hi Kazuya,

    1. VOUT1 and VOUT2 can be tied together. This does not mean that each channel can handle more current than when VOUT1/2 have separate loads. It just means that a load that requires more current than one channel can handle can use two channels in a parallel configuration so that the current is split amongst the two. Please keep in mind the typical nominal load current per channel and how it decreases due to mutual heating when both channels are on. 

    2. This device is designed for 24/48V systems because of its high voltage capabilities. However, you can still use it for a 12V system since it is still within the recommended operating range just make sure that at no point does it drop below the minimum supply voltage required.

    3. They are planned to RTM in 4Q this year. 

    Thanks,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Guru 21525 points

    Hi Rishika,

    Thank you very much for your reply.

    Could I ask you an additional question as the follow?

    Q.
    The customer is considering using TPS482H85-Q1 to drive inductive load.
    In their case, the high side switch output voltage (VOUT) is pull down to -60.5V with 2ms width 
    when the switch turns off from on. In this time, they apply 12V to VBB.

    In this case, is there any problem on TPS482H85-Q1?

    Is the voltage between VBB and VOUT too large?

    Thank you again and best regards,
    Kazuya.

     

  • 0 in reply to Kazuya Nakai59
    TI__Expert 7621 points

    Hi Kazuya,

    The VDS clamp will engage.

    If the demagnetization energy is expected to exceed what the device can safely dissipate, external circuitry must be used.

    Thanks,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Guru 21525 points

    Hi Rishika,

    Thank you very much for your reply.

    Could you tell me how to calculate the energy what the device can safely dissipate?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Expert 7621 points

    Hi Kazuya,

    I apologize but that data will not be available until the device is fully RTMed. 

    Section 7.3.4 Inductive-Load Switching-Off Clamp in the datasheet and section 4 Driving Inductive Load in the following app note, How To Drive Resistive, Inductive, Capacitive, and Lighting Loads (Rev. E), show how to calculate demagnetization energy. We do not have the device limit data at the moment but these resources can give an idea of how to use that information when it is available. 

    Thanks,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Guru 21525 points

    Hi Rishika,

    Thank you very much for your strong supports.

    "How To Drive Resistive, Inductive, Capacitive, and Lighting Loads (Rev. E) explains with TPS4H160-Q1 mainly.
    TPS4H160-Q1 is already released. 

    In the TPS4H160-Q1 case, which data is needed to calculate demagnetization energy?
    Is it Figure 4-5 TPS4H160-Q1 Demagnetization Capability in the document?
    Will demagnetization capability graph for TPS482H85-Q1 like Figure 4-5 be released when TPS482H85-Q1 is RTMed?

    Could you please give me your reply?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Expert 7621 points

    Hi Kazuya,

    Sorry for the delay. Yes, the TPS4H160-Q1 is already released but I was just pointing to an example that shows how to calculate if the device can handle the demagnetization energy depending on the load conditions; yes, it uses Figure 4-5 to determine if the device needs additional external circuitry or not. 

    We expect that some sort of upper limit is defined, or graph is shown in the datasheet when this device is RTMed.

    Thanks,

    Rishika Patel