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  • TI Thinks Resolved

TPS61310: TPS61310 ,Video light mode , continue current issue.

Part Number: TPS61310

Hi Sir,

I have a TPS61310 and trying to use LED2 in "video light" mode and output a current of 325 mA.  The datasheet shows it is supported by setting the Tx-Mask GPIO to 1.  I have attempted this many times and have verified the Tx-Mask Input is being set high.

The order of operations I am performing are:

1. set DCLC2[2:0] to 111

2. Set Tx-Mask high

3. Set Mode control to video light mode

The current being output is only 175 mA.

One other thing, the TI TPS61310 EVM GUI only shows the possible current values up to 175 mA, does this function actually work on this device?

Thanks.

  • In reply to Tommy Tzeng:

    Hi Tommy,

    Thank you for your patience. Sure, I'll let you know as soon as I've any further details on this part.

    Meanwhile, can you share more details about your application? How many channels are you using?

    Thank you,
    -Harini
  • In reply to Yu Billy:

    Hi Billy,

    I understand and will get back to you as soon as I've more details to set 325mA in video mode.

    Regarding reading Tx-MASK bit as value 0, TPS61310 datasheet says "Tx-MASK flag is reset after readout of the flag." So, I'd not rely on reading Tx-MASK bit.

    Thank you,
    -Harini
  • In reply to Harini Sankabattula:

    Hi Harini,

    Hope you have a nice holiday.

    Is there any update about setting 325mA in video mode? Thanks.

    BR

    Billy

  • In reply to Yu Billy:

    Hi Billy, Tommy,

    TPS61310 doesn't appear to have the capability to support >175mA continuous DC light operation.

    It looks like the part was originally been designed to support torch light in mobile phone applications, in which thermal management is quite challenging. That is the reason behind the part limiting the current to such a "modest" level. It is primarily for safety reasons.

    The way the logic had been coded in the devices looks to be so that you need to be in flash mode in the first place (or at least trigger a flash sequence) prior to driving the device in DC light operation (while Tx-Mask bit and signal are high) to enter the 325mA operation. In other words, that Flash current is set to 225mA for Code 6 and 325mA for Code 7 for ~600ms when TX_Mask pin and Reg 0x03<0> are both set as in conditions and scope shots captured in the attachment. 

    TPS61310_Behavior_2018Jan18.xlsx

    Best,

    -Harini

  • In reply to Harini Sankabattula:

    Hi Billy, Tommy,

    Please take a look at our other flash/torch mode devices that support higher current.
    1) LM36010, LM36011: Single channel LED flash driver and can support up to 376mA torch current.
    2) LM3648TT: Single channel LED flash driver and can support up to 500mA torch current.
    3) LM3644TT: Dual channel LED flash driver and can support up to 360mA torch current

    Best,
    -Harini

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