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how can I use the CTRL pin In IC tps61165?

ramanathan muthusamy
Prodigy 130 points
Other Parts Discussed in Thread: TPS61165

 In this IC whether am I connect pwm source or directly connected to any DC sources?there is no enough discription for this IC. can u any body know please reply this

  • 0
    TI__Mastermind 36110 points

    I don't understand your question.  The TPS61165 datasheet contains several paragraphs that describe the detailed operation of the CTRL pin and how it is used to dim the LEDs with several options.

  • 0 in reply to Matthew Day
    Prodigy 130 points

    Dear Michael,

                     In datasheet, CTRL pin is  mentioned only ON/OFF and light brightness control purpose. But my question is how can we use this pin? I dont unterstanding  what they are meaning. If you have any sample circuit diagram please post here


  • 0 in reply to ramanathan muthusamy
    TI__Mastermind 36110 points

    Yes, you are correct that the CTRL pin is use for on/off control and for LED brightness control.  LED brightness control can be accomplished by applying a PWM  pulse to the CTRL pin or by using the CTRL pin to digitally control the LED brightness via the Easyscale protocal.  The datasheet provides several working circuits, but the CTRL input is only shown as an input to your circuit.  You will need to design the circuitry that controls the CTRL pin.  I would like to suggest that you work directly with your local distributor on this project.  They will be able to provide local support to help you understand how the IC works as well as support the other functions in your project.  I'm interested to know what type of application you are designing.  Can you provide volumes and production date?  I hope you are considering TI for the other power requirements on your board.

  • 0 in reply to Matthew Day
    Prodigy 130 points

    Dear Michael,

                       I consider this IC for my home appliance LED Lighting purpose. also I dont want to adjust the LED brightness. It is glowing its maximum brightness.

    So only I am confusing about this CTRL pin. after Implementing my circuit I will send you. thanks for your reply.

  • 0 in reply to ramanathan muthusamy
    TI__Mastermind 36110 points

    You can order an EVM to evaluate the IC and compare the CTRL functionality to the datasheet explanation.  I would also like to suggest that you contact your local distributor who can help you work through your design details and help you select other components in your overall system.

  • 0 in reply to Matthew Day
    TI__Guru**** 166826 points

    The CTRL pin operates like an ENable pin but also provides two different methods for dimming the LED current.  If held down for more than 2.5ms, CNTRL disables the IC.  If a host provides the EasyScale communication protocol through the CTRL pin, then the IC enters EasyScale mode and the FB voltage, and therefore the LED current, can be changed via EasyScale commands.  If a PWM generator provides a 5kHz to 100kHz PWM signal of varying duty cycle, D, the FB voltage becomes 200mV X D.  If neither of these methods for analog dimming work for your application, please refer the app note below for third option:  http://www.ti.com/litv/pdf/slva471.