TPS92610-Q1: Revisiting previous question concerning SSH and SSL in a circuit to minimize current draw

Wayne Carpenter

Part Number: TPS92610-Q1
Other Parts Discussed in Thread: TPS92613-Q1,

In a previous thread, my question was, "I understand that the SSL and SSH are tied together to Out. My question, "If I do not use the Single LED Short Detection feature, what would be the best way to connect SSH and SSL in a circuit to minimize current draw? I need to have current draw low as possible" Wasn't answered completely. It was not mentioned what the maximum resistor divider value could be to minimize current draw."

The response was, "There is no maximum value for the resistor divider. TI recommends total resistance of R1and R2 greater than100-kΩ, so the current has negligible effecton LED luminance. You can use the resistor as large as possible."

My response was, "Interestingly, so even an extreme value of 1 Meg ohm would allow the SSH and SSL inputs to work properly."

There was no response, so I presume it is okay to use a value of 1 Meg ohm but what about the internal impedance of the TPS92610's SSL and SSH pins? Isn't there a limiting factor? Again, I need to minimize current draw as much as possible and I do not need any of the diagnostic functions.

Thanks

over 4 years ago

0 Frank Qiu over 4 years ago

TI__Genius 15776 points

I NEVER response "There is no maximum value for the resistor divider." in your

I don't know how you get this solution. SSL and SSH individually connect to a comparator, and the impedance is Mohm level. I offer you 2 recommendations on it:

1) use 100kohm to connect to GND, because the 1mohm has poor noise immunity; if you also don't care about the noise, you can left them floating.

2)if you don't like SLS diagnostic function, I recommend you use TPS92613-Q1. it has larger current and no SLS detect function.

0 Wayne Carpenter over 4 years ago in reply to Frank Qiu

Prodigy 210 points

I did not mention who I was quoting but it was was Sean Zhou in a thread at: on August 9th.

So, there was a difference in advice. I understand that SSL and SSH can be tied together and should be connected to a 100 K resister to GND.

As for using the TPS92613-Q1, it appears to be better, electrically but from two suppliers using the 100 unit price for comparison, the TPS92613-Q1 is approximately $0.26 or $0.27 more expensive. Do you have any other linear single channel high side LED driver that doesn't have all the extra features that the TPS92610-Q1 has?

Thanks