Answered

• LM3643: VIN voltage level

  

  Antony Lin

  Resolved

  Part Number: LM3643 Hi, The customer plans to drive two LED (one @ LED1 pin and one @ LED2 pin) with LED spec as below. Is there any concern here? And is it ok to use 3.3V as input power to IN pin? Thanks! Antony SFH 4770SR7S_20190730.pdf

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  • over 5 years ago
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Answered

• LM3643: Some pin connections

  

  Antony Lin

  Resolved

  Part Number: LM3643 Hi, We have some questions about LM3643 as listed below, would you share your inputs? Thanks! If oe only need FLASH function but don't need Torch function, how should we connect Torch/Temp pin and STROBE pin? How should we connect…

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  • over 5 years ago
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Answered

• LM3643: Can we disable the timeout?

  

  Alex Yeh

  Resolved

  Part Number: LM3643 Hi team, I would like to check if there is anyway to disable the timeout in LM3643? For system validation purpose, designer would like to disable the timeout and measure the actual current flow into LEDs. Regards, Alex

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  • over 5 years ago
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• LM3643: Strobe at 150Hz and pass mode vs boost operation

  

  Jeff Coletti

  TI Thinks Resolved

  Part Number: LM3643 Hi Support team Customer has a few questions: Section 9.3.3 talks about IR mode. Figure 27 is IR mode with Boost and Figure 28 is IR mode pass only. However the enable register only shows IR drive mode (Mode bits). Does the chip…

  • over 5 years ago
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• LM3643: Using a FET to create a modulation of the output current

  

  Jeff Coletti

  TI Thinks Resolved

  Part Number: LM3643 Hi Support team My customer needs to modulate the drive of the LED. In their application, the led must be driven with 100mA or more, however that produces too much brightness. What they want to do is add a FET between the cathode and…

  • over 5 years ago
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Answered

• LM3643: LM3643 - force flash mode for high current (several minutes)

  

  Frank Bolton

  Resolved

  Part Number: LM3643 Other Parts Discussed in Thread: LM3410 Hi, I want to drive a set of 4x high power LEDs at about 700mA (one at a time at i2c configurable current) using power from a single lithium cell (3.7V). The LM3643 and LM3643b each driving two…

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  • over 6 years ago
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Answered

• LM3648: LM3648 LED output pin

  

  Cheng Andy

  Resolved

  Part Number: LM3648 Other Parts Discussed in Thread: LM3643 , LM3644 Dear Sir, Is the LM3648 LED output pin separately connected to the LED? Will this design create any other issues?

  • Resolved

  • 7 months ago
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• LM3643: LM3643 can connect with only one LED?

  

  Went Cao

  TI Thinks Resolved

  Part Number: LM3643 Dear All The LM3643 can connect with only one LED? And how to design? Thanks.

  • over 6 years ago
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Answered

• LM3643: Transfer efficiency

  

  Went Cao

  Resolved

  Part Number: LM3643 Dear all As below link, it said using the LM3643/4/8 in an Inductorless, I have two questions about this application. 1. What about transfer efficiency in this application ? Is there any conversion efficiency curve ? 2. How long…

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  • over 5 years ago
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Answered

• LM3643: Increasing start up timing and response

  

  Jeff Coletti

  Resolved

  Part Number: LM3643 Hi Support team Customer has the following question, I also have a power point i can share via email We would like to significantly speed up this white LED current response time. Perhaps there is a way? Are there any top secret registers…

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  • over 5 years ago
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