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LM5113: lm5113

Part Number: LM5113
Other Parts Discussed in Thread: LMG1020

hello

We are deveping lidar using phase shift topologe for long distane (30m) ,

So we need emtting module which can operate high peak power and shortpulse.

When we deveoped laser driver using FET or laser driver IC.

We could'nt get maximum peak current . I think that's beacause solow rising time.

Then I find out GAN  operating fast rising time to get maximum peak current.

So I try to design circuit like this . If you don't mind , please check our circuit   and reviewing.

Or recommanding another parts.

This is our modulation specification and description about main parts.

1. main part

 - Gate driver : LM5113 TM
 - GAN : EPC2015C ( vds : 40v / rdson : 4mohm / Id :53A / Pulsed Id : 235A

 - Laser :  prinston optronics 's 40W CW laser / Part name : PCW-CS5-40-W0808  ( Operating voltage : 2v  / Oprerating current : 60A  / Threshold current : 10A )

2. Modulation spec

 - duty : 20%

 - pulse width : 100ns

 - freq : 2Mhz

ps : I have one more question .

     Firstly I try to use pulsed laser but i can't find it operating up to 20% (duty).  Even if CW laser is more expensive , i had to chose it  because of duty.

     If i use CW laser , is there any diffrences  compare to pulsed laser except duty. ( like risingtime) ??

THANKYOU

   

  • hello

    We are deveping lidar using phase shift topologe for long distane (30m) ,

    So we need emtting module which can operate high peak power and shortpulse.

    When we deveoped laser driver using FET or laser driver IC.

    We could'nt get maximum peak current . I think that's beacause solow rising time.

    Then I find out GAN  operating fast rising time to get maximum peak current.

    So I try to design circuit like this . If you don't mind , please check our circuit   and reviewing.

    Or recommanding another parts.

    This is our modulation specification and description about main parts.

    1. main part

     - Gate driver : LM5113 TM
     - GAN : EPC2015C ( vds : 40v / rdson : 4mohm / Id :53A / Pulsed Id : 235A

     - Laser :  prinston optronics 's 40W CW laser / Part name : PCW-CS5-40-W0808  ( Operating voltage : 2v  / Oprerating current : 60A  / Threshold current : 10A )

    2. Modulation spec

     - duty : 20%

     - pulse width : 100ns

     - freq : 2Mhz

    ps : I have one more question .

         Firstly I try to use pulsed laser but i can't find it operating up to 20% (duty).  Even if CW laser is more expensive , i had to chose it  because of duty.

         If i use CW laser , is there any diffrences  compare to pulsed laser except duty. ( like risingtime) ??

    THANKYOU

  • Hello Kyeongmin,

    Thanks for your question and interest for GaN. Can you explain what CW laser is? Can you also explain in specific what was the issue when you were using LM5113?

    Thanks!

    Lixing

  • Hi,

     For your application, unless I'm missing a requirement you have, you do not need a full half-bridge driver solution. The LMG1020 is a low-side driver which is very fast and is designed for this type of application. LMG1020-EVM-006 is a development board which demonstrates the LMG1020 as a LIDAR driver and should be exactly what you are looking for.

    I'm not an expert in continuous vs. pulsed laser design, so I can't answer your other question.

    Regards,

    Nathan

  • CW means continuous wave laser diode. It is possible to rise duty up to 100%. Conventional Pulsed laser's maximum duty is 0.1%.
    I don't know any issue exist . I just want to ask for review before we make module . And i need emitting module operating in duty 20%.
    But i can't find pulsed laser diode which is operating in duty 20%. That's why i try to use cw laser diode .
  • Thank you for your recommendation. I just used half-bridge driver solution because of high power consumption.
    As you recommend , i will use low-side driver solution (Gate driver LMG1020 , GAN EPC2015C ( vds : 40v / rdson : 4mohm / Id :53A / Pulsed Id : 235A)