TPS92620-Q1: Device and thermal sharing resistor power dissipation calculation sheet

Hi Sanghyeop,

1. I would like to know if you have calculation sheet for TPS92620-Q1 device and thermal sharing resistor to see power dissipation and current graph for each input voltages.

The external components calculator tool can be found in the TPS92620-Q1 product page under "design and development". You may refer to the page labelled "RES power distribution" in the calculator tool.

https://www.ti.com/tool/download/TPS92620-CALC 

2. at the beginning of LED turn on, it is turned by only OUTx? or it is turned by OUTx and RESx both? I would like to know the timing of RESx intervention.

We only specify the rise and fall time of the total output current. Is there a specific reason why you need to know the exact timing between OUTx and RESx? Typically it is the timing of the total output current ramp that is important.

3. how can I calculate Voltage drop for RESx and OUTx?

Do you mean the dropout voltage? The dropout voltage is specified in the electrical characteristics section of the datasheet

4. In case of fault condition like LED open or something, if just one LED string output channel is down, another channel goes down also?

Please refer to the FAULT table in section 6.3.9 of the datasheet and the detailed fault descriptions in section 6.3.7.

Regards,

Zach

Hi Sanghyeop,

If an LED open is detected on channel 1, the fault bus is pulled low with a 3mA constant pull-down current. If the fault bus is low, the other channels are turned off.

Regards,

Zach