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  • UCC28951-Q1: Why has the recommended calculation of Lmag and Lout changed?

    TI Thinks Resolved
    Part Number: UCC28951-Q1 Tool/software: When comparing the calculation used to determine Lmag and Lout, there is a factor of two (2) difference in the following documents: Lmag: SLUSDB2B (Equation 28) vs SLUA560D (Equation 8) Lout: SLUSDB2B (Equation…

  • UCC28951: Full Bridge Rectifier (with Diodes or MOSFTEs) with UCC28951 for 450 Vout 5kW converter

    Part Number: UCC28951 Other Parts Discussed in Thread: UCC28051 , UCC28950 Tool/software: Greetings, For our client, we're designing a 5kW PSFB prototype with PFC input 450V and fixed output 450V, with operating load varying from (nearly) 0 to full…

  • UCC28951: ESD REPORT, Electrostatic Discharge (ESD) Protection

    TI Thinks Resolved
    Part Number: UCC28951 Tool/software: Hi, pls kindly update ESD report ( Electrostatic Discharge (ESD) Protection ) for UCC28951PWR.

  • UCC28951: IC start up issue__MOSFET damage

    Part Number: UCC28951 Tool/software: Hi E2E Currently using UCC28951 to test dcdc products, the vds that output sr during startup will have abnormal spikes, causing the sr mos to burn out. I have tried voltage and current modes so far, and RTmin/DELAB…

  • UCC28951: PWM Jitter

    TI Thinks Resolved
    Part Number: UCC28951 Tool/software: What causes jitter in the PWM signal in the UCC28951, PSFB Converter? At approx 20% load I am seeing the Duty Cycle vary/bounce between 2 points, approx 45% to 55% Duty It results in audible noise. It is a negligible…

  • UCC28951-Q1: Problem with not being able to exit Burst Mode

    TI Thinks Resolved
    Part Number: UCC28951-Q1 Other Parts Discussed in Thread: UCC28951 Tool/software: V_in =390V V_out = 28V P_out =700W N = 12 Hello, I am working with a DC/DC converter with the above values. My R_tmin resistor has a value of 12k. I have no problems…

  • UCC28951-Q1: Reducing output ripple to meet stringent ripple/noise specs in 6.5 kW PSFB converter

    TI Thinks Resolved
    Part Number: UCC28951-Q1 Hi Team, Posting on behalf of our customer. I am working on a 6.5 kW phase-shifted full-bridge (PSFB) DC-DC converter with the following output specifications: Output voltage: 55 V Output current: ~130 A …

  • UCC28951-Q1: Continuing search for cause of outsized surged in primary current every switching cycle

    TI Thinks Resolved
    Part Number: UCC28951-Q1 Other Parts Discussed in Thread: UCC28951 , UCC28950 , UCC28950EVM-442 Tool/software: Suspecting improper connections or timing of secondary FET gates as the cause of large current surges that overpower reflected secondary current…

  • UCC28951-Q1: Controlling the input current

    Part Number: UCC28951-Q1 Other Parts Discussed in Thread: UCC28951 Tool/software: So, I utilizes the WEBENCH® POWER DESIGNER to develop a DC/DC for a Fuel cell application where the input voltage varies within 23 to 51 volts and the output is set…
    • Answered

  • UCC28951: Ref: PMP8740, does the CC loop gain change with load current value?

    Resolved
    Part Number: UCC28951 Other Parts Discussed in Thread: PMP8740 , Tool/software: Hello Roberto, Greetings! I am looking to model the CC loop gain for the PMP8740 reference design. A couple of questions: (1) Do you have a formula for the CC loop gain…
    • Resolved

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