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Download 24V 7.5A (195-265V, 132Khz)
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Design Warning (Optimization Done) Design Report ETD39/20/13 Vout 1: 24.00 V, 7.50 A 27T CLAMP 5T RTN Vbias: 12.0 V, 0.006 A Vin 3T 195-265 V AC EMI & Cin D Rectifier L TOP248Y From Vout 1 CONTROL UV/OV ILim C S X Feedback Secondary Zener F Design Results Power Supply Input Var Value Units VACMIN 195 V VACMAX 265 V FL 50 Hz TC Z N VBRIDGE IAVG CIN VMIN VMAX 1.92 0.58 81.0 600 0.97 150.0 228.2 374.8 ms Diode Conduction Time Loss Allocation Factor Efficiency Estimate Diode Bridge Voltage Rating Average Diode Bridge Current Input Capacitance Minimum DC Input Voltage Maximum DC Input Voltage % V A µF V V Device Variables Var Value Device TOP248Y PO 180.07 VDRAIN 678 VDS 8.08 FS 132000 KRPKDP 0.72 Description Min Input AC Voltage. Max Input AC Voltage Line Frequency Units W V V Hz Description PI Device Name Total Output Power Maximum Drain Voltage Drain to Source Voltage Switching Frequency Continuous/Discontinuous Operating Ratio KI 1.00 KI Factor ILIMITEXT 4.18 A Device Current Limit External Minimum ILIMITMIN 4.18 A Current Limit Minimum ILIMITMAX 4.82 A Current Limit Maximum IP 4.01 A Peak Primary Current IRMS 1.66 A Primary RMS Current DMAX 0.38 Maximum Duty Cycle RLS 3.0 MΩ Line sense resistor RLS2 22.0 kΩ Line sense resistor VZ 6.20 V Zener Diode for Under-voltage Line sensing Bias and Clamp Components Section Var Value Units Description VB 12.0 V Bias Voltage IB 0.006 A Bias Current VDB 1.00 V Bias Diode Forward Voltage Drop PIVB 47 V Bias Rectifier Max Peak Inverse Voltage NB 2.5 Bias Winding Number of Turns VCLO 200 V Clamp Zener Voltage PZ 5.1 W Primary Zener Clamp Loss. See Errors, Warnings, Information section for detail Transformer Construction Parameters Var Value Units Description Core/Bobbin ETD39/20/13 Core Type Core Manuf. Generic Core Manufacturer Bobbin Generic Bobbin Manufacturer Manuf. LP 209 µH Primary Inductance NP 27.0 Primary Number of Turns NB 2.5 Bias Winding Number of Turns AWG 20 AWG Primary Wire Gauge. See Errors, Warnings, Information section for detail CMA 616 Cmils/A Primary Winding Current Capacity VOR 135.00 V Reflected Output Voltage BW 25.70 mm Bobbin Winding Width M 4.00 mm Safety Margin Width L 1.40 Primary Number of Layers AE 125.00 mm² Core Cross Sectional Area ALG 287 nH/T² Gapped Core Effective Inductance BM 2484 Gauss Maximum Flux Density BP 2984 Gauss Peak Flux density BAC 896 Gauss AC Flux Density for Core Loss LG 0.486 mm Estimated Gap Length LL 1.6 µH Primary Leakage Inductance LSEC 30 nH Secondary Trace Inductance Output 1 Var Value Unit Descripti s on VO 24.00 V Output IO 7.50 A PIVS 93 V ISP 21.38 A ISRMS DO 11.32 Undefin ed 1200 x 3 8.48 A CO IRIPPL E Expect ed Lifetim e LPF CPF Voltage Output Current Output Rectifier Maximum Peak Inverse Voltage Peak Secondary Current Secondary RMS Current Recommended Output Diode µF Output Capacitor A Output Capacitor RMS Ripple Current 45621 hr Expected Lifetime of Output Capacitor 2.2 – 10 100 – 680 5.0 5 µH µF Post Filter Inductor Post Filter Capacitor NS Rounde d Down NS Rounde 24.00 d Down VO Rounde 5 d Up NS Rounde 24.00 d Up VO AWGS 13 - 17 Range Feedback Circuit Var Value RF1 1000.00 RF2 464.0 Rated 22.0 Voltage Secondary Number of Turns Rounded to Integer Secondary Number of Turns V Auxiliary Output Voltage for Rounded down to Integer Secondary Number of Turns Rounded to Next Integer Secondary Number of Turns V Auxiliary Output Voltage for Rounded up to Next Integer Secondary Number of Turns AW G Secondary Wire Gauge Range. See Errors, Warnings, Information section for detail Units Ω Ω V Description Zener Biasing resistor Zener Compensation resistor Zener Rated Voltage Zener Test Current 5.0 mA Zener Test Current High power flyback design. Recommend split primary winding construction. Zener clamp may require parallel resistor/capacitor. High output current flyback design. Use parallel low ESR output capacitors, reduce secondary ripple currents by reducing VOR and KRP/KDP. Errors, Warnings, Information Description Check Zener clamp temperature. Wire gauge is less than recommended minimum. Secondary wire gauge is less than recommended minimum (26 AWG). Fix Consider adding parallel RC to zener or move to an RCD clamp, split primary "sandwich" (L>1), use lower switching frequency, reduce reflected voltage (VOR) and minimize secondary trace inductance (LSEC), esp. low-voltage/high current outputs. Consider a parallel winding technique (bifilar, trifilar), increase size of transformer (larger BW) or reduce margin (M). Consider a parallel winding technique (bifilar, trifilar) for > 1.5 A outputs, increase size of transformer (larger BW) or reduce margin (M). Show me Ref. # 205 221 232