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LM25183-Q1 データシート(PDF) 19 Page - Texas Instruments

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部品番号 LM25183-Q1
部品情報  LM25183-Q1 42-VIN PSR Flyback DC/DC Converter with 65-V, 2.5-A Integrated MOSFET
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM25183-Q1 データシート(HTML) 19 Page - Texas Instruments

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19
LM25183-Q1
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Copyright © 2020, Texas Instruments Incorporated
8.2.1.2.4
Flyback Diode – DFLY
The flyback diode reverse voltage is given by Equation 19.
(19)
Select a 60-V, 3-A Schottky diode for this application to account for inevitable diode voltage overshoot and
ringing related to the resonance of transformer leakage inductance and diode parasitic capacitance. Connect an
appropriate RC snubber circuit (for example, 100 Ω and 22 pF) across the flyback diode if needed, particularly if
the transformer leakage inductance is high. Also, choose a flyback diode with current rating that aligns with the
maximum peak secondary winding current of NPS × ISW-PEAK.
8.2.1.2.5
Leakgae Inductance Clamp Circuit – DF, DCLAMP
Connect a diode-Zener clamp circuit across the primary winding to limit the peak switch voltage after MOSFET
turnoff below the maximum level of 65 V, as given by Equation 20.
(20)
Choose a 20-V zener diode for DCLAMP to give a clamp voltage of approximately 1.5 times the reflected output
voltage, as specified by Equation 21. This provides a balance between the maximum switch voltage excursion
and the leakage inductance demagnetization time. Select a Zener diode with low package parasitic inductance to
manage the high slew-rate current during the switch turnoff transition.
(21)
Choose an ultra-fast switching diode or Schottky diode for DF with reverse voltage rating greater than the
maximum input voltage and forward current rating of 2 A or higher.
8.2.1.2.6
Output Capacitor – COUT
The output capacitor determines the voltage ripple at the converter output, limits the voltage excursion during a
load transient, and sets the dominant pole of the small-signal response of the converter. Select an output
capacitance using Equation 22 to limit the ripple voltage amplitude to less than 1% of the output voltage at
minimum input voltage and maximum load.
(22)
Mindful of the voltage coefficient of ceramic capacitors, select three 22-µF, 25-V capacitors in 1210 case size
with X7S or better dielectric. Assuming operation in BCM, calculate the capacitive ripple voltage at the output
using Equation 23.
(23)
Equation 24 gives an expression for the output capacitor RMS ripple current.
(24)
8.2.1.2.7
Input Capacitor – CIN
Select an input capacitance using Equation 25 to limit the ripple voltage amplitude to less than 5% of the input
voltage when operating at nominal input voltage.


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