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Recent content by riscy

  1. riscy

    Coin Battery for RTC within ATEX Zone 2 or Class 2 Div 2

    Is there a guideline about lithium coin battery for real-time clock mounted on the board within a diecast IP65 sealed box (about 150x150x150mm) within Class 2 Div 2 or ATEX Zone 2 (ie dog-house). Does it require further mitigation measures (ie pressure vents)? I have put a small fuse on the PCB...
  2. riscy

    SUNTRY MOTOR, where is the link?

    I wish to inspect cheap motor gearbox manufacture website under name of SUNTRY MOTOR or SUNTRYMOTOR, I could not find it from google search. Suggestion where to download catalog and which link for direct buy?
  3. riscy

    60079-11: Intrinsic Safety: I have 24V and 200mA, which is Pin=4.8W, what is P = Vo*Io / 4 equation

    I come across the equation P = Vo*Io / 4 (1) I have 24V and 200mA AC/DC PSU into Zone 2 sealed case (IP67) with electronics and barrier modules for sensors attached to pipes. This is 4.8W, but I come across a weird equation P = Uo * Io / 4, what are they? (2) What kind of barrier to use...
  4. riscy

    CAN Bus, what kind of protocol ?

    Thanks.
  5. riscy

    CAN Bus, what kind of protocol ?

    Hi CAN bus system in question is being used for industrial tool (not automotive). Maximum cable distance is no more than 5 meter. All device are mixture of dsPIC33 and PIC24. The physical part of the CAN-Bus is simple, however it is not like UART protocol when exchanging message or data. The...
  6. riscy

    Forster and Caure ladder conversion...help!

    Can anyone link me to software or excel that actually convert the Forster to Caure (and vice versa) ladder network used for thermal circuit. I have less than 5-6 stage circuit.
  7. riscy

    MATLAB, thermal simulation

    thank....I have to go to work and experiment them and see how it goes, I was wondering if anyone have example of PCB, package die for this app.
  8. riscy

    MATLAB, thermal simulation

    I did a search on Mathworks User Community File Exchange, could not find useful material there, it not easy to find as well.
  9. riscy

    MATLAB, thermal simulation

    Anything related to Thermal simulation? Has it done before? Where can I find the sample files, representing PCB, ICs, etc.
  10. riscy

    thermal capacitance for PCB

    Based on JEDEC JESD51-7, defining the PCB as 4 layer 2x 2oz and 2 x 1oz (inner) with copper area 70mm x 70mm. It is used as high conductivity test bed for package thermal performance assessment. I'm interest in transient and wish to know if anyone calculated or/and measure thermal capacitance...
  11. riscy

    MATLAB, thermal simulation

    I'm currently studying FEA/CFD and BEM for thermal simulation of custom dies within custom package mounted on custom PCB with encapsulate material (epoxy). I getting familar with CFD concept which seem overkill from ANSYS IcePack (too expensive) but exploring BEM technology from E3D in france...
  12. riscy

    thermal R & C model for QFN and TSSOP

    Thank for the email, it is very interesting note. Which is the reason I posting this message. Does this mean the thermal capacitance modelling method for transient is not a working model as published say. I'm curious for reason why designer prefer not to use it or publish their finding, I...
  13. riscy

    thermal R & C model for QFN and TSSOP

    Hi Has anyone have thermal capacitance and resistance model for the QFN and TSSOP package (QFN, 4x4, 7x7 and 9x9 with exposed pad) and similar size for TSSOP with exposed pad. I actually have thermal resistance, derived from IC website but they do not have thermal capacitance, I need this to...
  14. riscy

    Wurth WE-PERM and WE-PERM2

    Can anyone tell me what magnetic core material they used in WE-PERM and WE-PERM2, for high current inductor core. I more interest how performance degrade over temperature and if possible losses. I'm familiar with 3F3 by Ferroxcube. Thanks
  15. riscy

    LCD CCLF: Low Voltage Directive, does it apply to CCLF's invertor?

    I have been looking into high contrast LCD and now there are LED panel available which is driven by lower voltage (less than 40V) thus the LVD does not apply. The issue with CCLF that it requires 500V inverter O/P from 12V I/P mounted next to the LCD panel. The LCD and inverter is mounted...
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