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    Help in Orcad Layout:While placing components I dont need unnecessary texts

    While trying to place the componets manually in Orcad Layout, when I select a component, there comes a whole load of texts and arrows free with the package. That messes up the whole layout diagram and I need to delete each arrow and text manually. This becomes very tedious. Is there a way to...
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    "PCB Footprint" missing from instance

    Figured out...thanks anyway..
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    "PCB Footprint" missing from instance

    This is my first day on PCB design and am working on Cadence orcad version 16.5. I created netlist. .mnl file is created. But i dont see .tch or .brd  ...So i tried to create netlist, and in the PCB editor tab, i did some changes. That gave a long list of errors. All saying the same, "PCB...
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    Average current mode control for boost converter

    Can someone pls help me with Average current control modeling. The block diagram of the circuit is attached. But I dont know the basics of this technique. How can I calculate the values of the resistors, capacitors, the constant in multiplications etc. How to derive the transfer function of each...
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    Average current mode control for boost converter

    Can someone suggest me any literature or book or any material where I can read and understand the very basics of average current mode control for a boost converter. By basic, I mean the purpose of every block, component, every theoretical detail. I need it urgently.
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    Is there something missing in gate driver(IR2117) circuit of a buck converter? h

    Sorry, I wrote VO instead of VS. Its pin VS and not VO.
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    Is there something missing in gate driver(IR2117) circuit of a buck converter? h

    This gate driver is for a buck converter. The input to this IC is a nice pulse of frequency 100 KHz of variable duty ratio. I have checked the circuit many times and ensured that no shorting is there. But the output remains 0 volts. The output HO is hanging as well as the output VO is hanging...
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    Confusion on type of capacitor to be used in SG3524.

    While using SG3524, for buck converter, I need to give a feedback to the error amplifier at pin 1. At the output of the error amplifier  (pin 9) I have the Caps and Resistors for compensation. Do the capacitors here need to be ceramic disc capacitors necessarily? Or any specific type of...
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    Help...problem with test circuit of SG3524..with duty ratio.

    Thank you for your reply and for your concern. There is no load, which I thought would be inappropriate at first. The value of the inductor is 0.150 mH. Ramp voltage, as in normal situation is there on pin 7. Pin 12 and 13 are shorted and there is signal with almost 0 duty ratio on pin12 and 13...
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    Help...problem with test circuit of SG3524..with duty ratio.

    This is one of the test circuits given in datasheet of SG3524, with a little modification, mostly insignificant, like changing the value of inductor and using just one BJT instead of 2, as given in datasheet. I am not getting any output there. The expected % volts is not there. The signal out of...
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    Buck converter with SG3524 and IR2117, problem with duty cycle.

    Thanks Hero999.. It was this bootstrap problem and I dealt with it. Yeah I know I dont have to manually adjust the duty cycle, but at initial stage I used to adjust the positive input of comparator of SG3524 manually. I get good duty cycle from both SG3524 and IR2117. But there is a new prob...
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    Buck converter with SG3524 and IR2117, problem with duty cycle.

    I have to build a buck converter, with variable input from 10 V - !5 V. Use a PI controller to maintain the output at 5 V. I have used SG3524. Now, it is clear that I should be able to attain a pulse width of duty ratio 33% to 50%, exactly speaking. And wider range of duty ratio will be even...
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