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Frequent questions

  • [FAQ] BQ25171-Q1: Configuration Pins and Design Questions

    Part Number: BQ25171-Q1 The device can be configured to charge Li-Ion, NiMH and LiFePO using external pins. Can the configuration be changed during operation? Any other things I should note?

  • [FAQ] BQ25890: Why does ICHG reduce when reaching the maximum duty cycle for the BQ25890, BQ25890H, BQ25892, BQ25895, BQ25895M, BQ25896, BQ25898, BQ25898D, BQ24190, BQ24192, BQ24195, BQ24195L, BQ24196, BQ24295, BQ24296, BQ24296M, BQ24259?

    Part Number: BQ25890 The charger is basically a step-down DC-DC (buck) converter. It requires the input voltage to be higher than the output voltage with some headroom for normal operations. The maximum duty cycle specification is one of the factors…

  • [FAQ] BQ25890: Why does ICHG reduce during input voltage DPM (Dynamic Power Management) or the input current DPM for the chargers BQ25890, BQ25890H, BQ25892, BQ25895, BQ25895M, BQ25896, BQ25898, BQ25898D, BQ24190, BQ24192, BQ24195, BQ24195L, BQ24196,...

    Part Number: BQ25890 When the input source is over-loaded, it is either from the current exceeding the IINDPM (Input Current Limit) or from the voltage dropping below VINDPM (Input Voltage Limit). For the current to cause the input source to be…

  • [FAQ] BQ25618: [FAQ] Why does ICHG reduce when reaching the maximum duty cycle for the BQ25618, BQ25618E, BQ25619, BQ25611D, BQ25616, BQ25600, BQ25600D, BQ25601, BQ25601D, BQ25606?

    Part Number: BQ25618 The charger is basically a step-down DC-DC (buck) converter. It requires the input voltage to be higher than the output voltage with some headroom for normal operations. The maximum duty cycle specification is one of the factors…

  • [FAQ] BQ25618: Why does ICHG reduce during the input current DPM (Dynamic Power Management) or the input voltage DPM for the chargers BQ25618, BQ25618E, BQ25619, BQ25611D, BQ25616, BQ25600, BQ25600D, BQ25601, BQ25601D, BQ25606?

    Part Number: BQ25618 When the input source is over-loaded, it is either from the current reaching the IINDPM (Input Current Limit) or from the voltage dropping to the VINDPM (Input Voltage Limit). For the current to cause the input source to be…

  • [FAQ] TPS53353: [FAQ] VFB at Light Load Current vs Heavier Load Current

    Part Number: TPS53353 If using skip mode, a higher VOUT is expected at a light load when compared to a heavier load when the device is operating in CCM. This is not an artifact of the reference voltage (or feedback voltage) changing as a function of load…

  • [FAQ] UCC27282: How to Calculate the Max Operating Frequency of a Half-bridge Gate Driver

    Part Number: UCC27282 The Excel tool linked below will calculate the maximum operating frequency of a gate driver for varying transistor and circuit parameters

  • [FAQ] UCC27282: Determining the Minimum On-Time of the Low-Side Transistor

    Part Number: UCC27282 This FAQ addresses the necessary minimum on-time for the low-side transistor to achieve proper operation in half-bridge gate drivers

  • [FAQ] UCC27282: How to Correctly Size the Bootstrap Capacitor for Half-Bridge Gate Drivers

    Part Number: UCC27282 Other Parts Discussed in Thread: UCC27211 This FAQ discusses the proper way to size the bootstrap capacitor for half-bridge gate drivers

  • [FAQ] TPS23881: Why are my Type 3 PSE controllers not SIFOS AT compliant?

    Part Number: TPS23881 Other Parts Discussed in Thread: TPS23882 Why are my Type 3 PSE controllers not SIFOS AT compliant? And how do I achieve compliance?

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