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TPS92611-Q1: LED driver for Winker application

Anoop kumar N
Intellectual 998 points
Part Number: TPS92611-Q1
Other Parts Discussed in Thread: TPS92643-Q1

Hello Experts,

We are working on LED driver for winker & Front position light application. For FPL (current is < 300mA) we are using TPS92611 and for Winker current is around 1A & we are planning to use Allegros A6217-1

Qn 1. Do TI have any dedicated Drivers suitable for Winker application said above. (with Configurable timing circuit, so that led blinking time constant can be set from the driver itself)

Qn 2. Didn't found any information of EN pin configuration inside the TPS92611-Q1 in its datasheet, if it is pulled down using some resistor internally. ?

Qn 3. Our application comes with, when the Winker signal comes FPL needs to be turned off, For that can we use some open drain configuration shown below on TPS82611 En pin ?

  • 0
    TI__Mastermind 23116 points

    Hello Anoop,

    Can you please help clarify your terminology.  What is winker?  are you meaning to say blinker?  We have the TPS92643-Q1 which would be the best replacement for the A6217-1)  I am not sure what you mean by a "Configurable timing circuit, so that led blinking time constant can be set from the driver itself"  The TPS92643 can be controlled using a PWM signal on the UDIM pin or it can be controlled using the APWM pin. 

    2) The EN pin needs to be pulled high or low as it is a a high impedance node which should never be left floating and no internal pullup or pulldown resistor is implemented.  

    3)  Yes, you could do something like that.  

    -fhoude

  • 0 in reply to fhoude
    Intellectual 998 points

    Hi fhoude, Thanks for your time,

    The winker is nothing but, the turn indication lamp of the vehicle. 

    For application like sequential blinking, we need some analog PWM to be generated externally, we are not using any microcontroller.  I am asking for some Driver having this feature internally, so that i can avoid some analog pulse generation circuitry.

    Regards.

  • +1 in reply to Anoop kumar N
    TI__Mastermind 23116 points

    Hello Anoop,

    Please look at the description of the APWM pin in the datasheet of the TPS92643-Q1.  I think you could create a circuit that does analog PWM dimming based on the APWM feature of this part.  I am not sure what kind of sequence you are thinking of trying to do so I can't give a direct recommendation.