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TAS5342LA: Over Current

Yuta Nishie
Genius 4480 points
Part Number: TAS5342LA
Other Parts Discussed in Thread: TAS5142, TAS5342A,

Tool/software:

Hi,

1． What is the formula for the relationship between Over Current Limit value and resistance value for TAS5342A, TAS5342LA and TAS5142?

I checked the data sheet, but I could only find the table of OC vs ROC. Also, the data sheet says "See the Electrical Characteristics of this data sheet for information on the correlation between programming-resistor value and the OC threshold." ”, but the formula could not be found in Electrical Characteristics.

2. TAS5342A, TAS5342LA

In the data sheet "6.3 Recommended Operating Conditions," it is stated that Roc_max=47kOhm, but is there any problem if Roc_max>47kOhm to reduce the value of overcurrent protection?

As the data sheet states as follows, I would like to know if my question is feasible. Setting the OC threshold too low might cause issues such as lack of enough output power and/or unexpected shutdowns due to too-sensitive overload detection.

Best Regards,

Nishie

  • +1
    TI__Genius 9175 points

    Hi Nishie,

    Resistors outside of those specified in the electrical characteristics are not allowed on the device. For example, the TAS5342LA can have a Roc resistor between 22k and 47k with a 5% tolerance. There is not a specific formula for the OCP limit vs Roc, but you can use the table and the over current protection limit test case to give you what the value would be. Using the TAS5342LA as an example again, if you were to use a 39k resistor, you could expect a over current threshold of around 6A.

    Regards,

    Ramsey