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UCY2G150MPD Scheda tecnica(PDF) 6 Page - Diodes Incorporated |
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UCY2G150MPD Scheda tecnica(HTML) 6 Page - Diodes Incorporated |
6 / 12 page AN75 Issue 1 – January 2011 6 www.diodes.com © Diodes Incorporated 2010 Free-wheel diode calculation The free-wheel diode D F shown in Figure 1 is chosen based on its maximum stress voltage and total power loss. The maximum stress voltage rating of the free-wheel diode is the same as the MOSFET. It is advisable to use ultra-low reverse recovery time T RR (<35ns) diode as DF to reduce the MOSFET’s switching ON loss. In the design example, 1A 600V rectifier, MUR160, is selected. The worst case average current through the diode occurs at V LED(max) and VIN(min). mA 202 V 373 V 42 1 mA 240 V V 1 I I (max) IN (min) LED ) nom ( LED D(avg) = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − × = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − × = Assuming a constant forward voltage drop V F across the diode, the conduction power loss can be calculated, mW 222 V 1 . 1 mA 202 V I P F ) avg ( D COND _ D = × = × = Finally, the diode junction temperature without using the heat sink can be calculated from, C 87 C 80 W C 32 mW 222 T θ P T AMB thJA COND _ D j o o o = + × = + × = The internal ambient temperature within the LED converter, T AMB, is assumed to be 80ºC. θthJA = W C 32 o is the thermal resistance for DO-201 package. For practical design, it is recommended to keep the junction temperature below 110ºC to avoid temperature stress on the device. |
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