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  • RE: LM22677: Internal short circuit causing catastrophic failure

    Hi Jack, Have you ruled out the possibility that the schottky diode is the problem? Do you see any weird switching behavior from the device? Thanks, Andrew

  • LM22677: Dual LM22677 self-synchronise not working as expected

    TI Thinks Resolved
    Part Number: LM22677 On a development board, I have two LM22677 buck converters for two different voltage levels (adjustable at 12V, fixed at 5V). As per the datasheet section 7.3.4, the RT/SYNC pins of the two connectors are pulled low with 1k resistors…

  • LM22677: IC Temperature Junction Calculation

    Part Number: LM22677 Hello, I am wondering if you could help me sort out an issue I'm having with a power calculation. The datasheet for the LM22677 is showing that the ThetaJA for the part is 22°C/W. Is there a specification for the ThetaJC? …
    • Answered

  • LM22677: Can't simulate the device in Webench

    Resolved
    Part Number: LM22677 Hi Team, Our customer tried to simulate the LM22677(ADJ) in Webench with the specifications below but the simulated reported an error that the design cannot be created. However, using the specifications from the evaluation module works…
    • Resolved
    • Answered

  • LM22677: Self-synchronization device limit

    Resolved
    Part Number: LM22677 In the datasheet for LM22677 it details how two IC's can be connected together in self-synchronization mode. Is it possible to self-synchronize three of these IC's? If so, how would it be done? Thanks
    • Resolved
    • Answered

  • LM22677: Feedback resistor constraints vs. design guide suggestions for 24V output.

    Resolved
    Part Number: LM22677 The datasheet for the LM22677-ADJ mentions how "A maximum value of 10 kΩ is recommended for the sum of RFBB and RFBT to maintain good output voltage accuracy" (page 15), while the design guide ( www.ti.com/.../snva556.pdf…
    • Resolved

  • LM22677: The EN pin will vibration when startup

    TI Thinks Resolved
    Part Number: LM22677 Hi Team, my customer put a 100nF cap on EN pin and hope it will make stable. but they found the EN pin will vibrate and the vibration range follow cap. the cap bigger will cause vibration range higher. could you check why the cap will…
    • Answered

  • LM22677: IC were damage after first power on or in burn-in test.

    Resolved
    Part Number: LM22677 Hi , Picture 1 is customer's last generation product and they had produced 10 kilo units without problem. Because they want to change brown-in voltage in new product, as picture 2 they modify the EN pin from a 470kohm pull-up…
    • Resolved
    • Answered

  • LM22677: LM22677 alternativ or newer reliability data

    Resolved
    Part Number: LM22677 Other Parts Discussed in Thread: LM73605 In our safety critical system we have to perform a MTBF / FIT-Rate calculation. Therefore I'm often using the data from the TI-Website: http://www.ti.com/quality/docs/estimator.tsp …
    • Resolved
    • Answered

  • LM22677: LM22677 Short circuit Issue,

    Resolved
    Part Number: LM22677 LM22677 Short circuit Issue, During the cost issue, Cin and Cout All use electrolytic capacitor (Not Low ESR capacitor), And Doing Short circuit test from continuous 24V power to VIN then 100Hz PWM control single to EN pin (CV Mode…
    • Resolved

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