Troubleshooting LM25184QNGURQ1 for Dual Output at +/-24V
Explore the evaluation process of using LM25184QNGURQ1 to generate 40mA at +/-24V, analyzing test results and seeking solutions for excessive ripple in the output waveform with a 1K resistor. Get insights into design modifications and potential issues to address.
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Presentation Transcript
Technical support for using LM25184QNGURQ1 to generator 40mA @+/-24V
My evaluation processing, Please take a look and help My evaluation processing, Please take a look and help Ordered the dual output evaluation board(LM5180EVM-DUAL) form TI via the following link. https://www.ti.com/tool/LM5180EVM-DUAL Order the LM25184QNGURQ1 chip from TI too Order the COILCRAFT: ZA9673-BED transformer from Digi key the datasheet can be found from the following link: ZA9670, ZA9671, ZA9672, ZA9673, ZA9674 Flyback Transformers (coilcraft.com) By reference the LM5180-Q1 Dual-Output EVM User's Guide (Rev. B) (ti.com), we did the following: Replace the LM5180 chip with LM25184 chip Replace R6 from 154K to 121K Replace transformer with ZA9673-BED, and short PIN-1/2 and PIN-3/4. Replace both Zener D5 and D6 with 27 Volts Change the polarity orientation of D1 and D3 Short C14 Apply 24V Voltage at the input Take measurement of the output waveform with and without 1K resistor be connected between Vout1-GND and Vout2-GND. Please see the test result The first slide is open load condition, the out1 and out2 ripple are about Vpp = 50mV, and it consume about 500mW power. The second slide is the test with 1k resistor between Vout1-GND and Vout2-GND, the current suppose to be only 24 mA for both Vout1 and Vout2, but the ripple is too much. Any idea what is exactly going on here? The schematics is what I am planning to implement on my design, the PCB layout is done, and I have put it on hold for fabrication. Because based on the evaluation result today, I am worried NOW! Please help ASAP, thank you!
