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Recent content by sattar138

  1. S

    Slowing down a power IGBT switch

    Hi all: Can you provide your comment on the following inquiry? I am designing a power supply system in which I will be switching an IGBT (IXGT60N60B2 from IXYS). I need to slow down the switching time of the IGBT. I can add series resistance at the gate to slow down the switching. Q1: Can...
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    Converting an analog input called "SPEED" (level=24V) to a signal suitable for MOSFET

    Re: Converting an analog input called "SPEED" (level=24V) to a signal suitable for MO Hi Frankliner: It's an analog signal with voltage level ~24V. The objective is to convert this signal into 3.3V level so that it can be connected with a microcontroller. thanks, Sattar
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    Converting an analog input called "SPEED" (level=24V) to a signal suitable for MOSFET

    Re: Converting an analog input called "SPEED" (level=24V) to a signal suitable for MO Hi FvM: Can you suggest me a circuit with your ide that you mentioned above? Hi Frankliner: Do you want me to replace the MOSFET (BSS138) with a NPN transistor?
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    Converting an analog input called "SPEED" (level=24V) to a signal suitable for MOSFET

    Re: Converting an analog input called "SPEED" (level=24V) to a signal suitable for MO Any other suggestion from onyone else.
  5. S

    Converting an analog input called "SPEED" (level=24V) to a signal suitable for MOSFET

    Converting an analog input called "SPEED" (level=24V) to a signal suitable for MOSFET Hi, Can you give me some idea about how I can use an input analog siganl called SPEED (voltage level=24V) to drive a logic level MOSFET [BSS138 from Fairchild, 50V/0.22A, Vgs=+/-20V, Vgs(th)=0.8 to 1.5V]...
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    LED drive circuit design

    Scanman, Doubletao: Thank you for your comments/suggestions. Any other ides from any one else? Sattar
  7. S

    LED drive circuit design

    Hi Scanman: Did you consider the fact that when all 16 LEDs are in series in one current line, if one LED fails then the LED string is cut off ~ results of discontinuation of lighting from other LEDs in the series? What are problems of putting two rows of 8 LEDs? thanks, Sattar
  8. S

    LED drive circuit design

    Hi ALL: I need your advice for designing an string of White LEDs driver circuit using TI UCC28810 (LED light controller). 16 White LEDs with a spec of 10.5V at 350mA and the power is 3.67W for each LED. Total power dissipation by the LED string would be 16x3.67~59Watts. With 20% derating the...
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