Application Note AN-1077 - International Rectifier

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Application Note AN-1077 power dissipation to an absolute minimum during a standby mode, or to shut down the converter at the discretion of the system designer. The sleep mode is activated any time the OVP pin, (pin 4), is at a voltage level lower than 0.62V (typ). The gate drive output provides sufficient drive capability to efficiently drive MOS gated power switches typical of the application. Operating Temperature Nominal DC Output Voltage Maximum DC Output Voltage Minimum Output Holdup Time Converter Switching Frequency Maximum Soft Start time 385V 425VDC 30msec @ 285VO 100kHz 50msec Converter Input and Output Variables Defined Figure 6 - IR1150S Pinout PFC CONVERTER DESIGN PROCEDURE This section describes a typical design procedure for a Continuous Conduction Mode boost converter for power factor correction using the IR1150S control IC. Additionally, some of the design tradeoffs typical of PFC converter design are discussed. A schematic diagram is presented as a reference to a step by step design procedure for designing a typical 300W PFC converter. An IR1150S Demo Board [2] is available from International Rectifier which highlights the performance of the IR1150 and was designed in accordance with the design procedure presented in this application note. AC Input Voltage (rms) Input Line Frequency Target Efficiency Power Factor (PF) Harmonic Distortion Converter Specifications AC Inrush Current (peak) 85V(min) - 264V(max) 47-63Hz 92% min @ 90VAC / 300W 0.99 min @ 115VAC / 300W 4% max @ 115VAC / 300W 35A max @ 230VAC / 300W Maximum Ambient 50°C P OUT(MAX) P IN(MAX) η MIN I IN(RMS)MAX I IN(PK)MAX I IN(AVG)MAX V IN(RMS)MIN V IN(PK)MIN Maximum converter output power delivered to load Maximum converter input power drawn from AC source Minimum worst case efficiency of converter Maximum rms value of input current drawn from AC source Maximum peak value of input current drawn from AC source Maximum average value of input current drawn from AC source Minimum rms value of input voltage supplied by AC source Minimum peak value of input voltage supplied by AC source International Rectifier Technical Assistance Center: USA ++1 310 252 7105 Europe ++44 (0)208 645 8015 4 of 18
Application Note AN-1077 Converter Schematic Diagram Rs Rf L1 Dg1 Rg2 Cz Cp Vout - + 1 2 D1 3 Cin Rsf Csf 1 2 3 4 IR1150S COM GATE 8 FREQ VCC 7 ISNS VFB 6 OVP Cb5 + Cb4 Rgm Q1 Rovp1 Rfb2 Rovp2 COMP 5 Rovp3 Q2 Rslp2 Rslp1 + Cout RTN Vsleep 4 Vin Rth t F1 D3 Rg1 Dg2 Rg3 Rd Cd D2 Rfb1 Rfb3 International Rectifier Technical Assistance Center: USA ++1 310 252 7105 Europe ++44 (0)208 645 8015 5 of 18
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Application Note AN-1077 - International Rectifier

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