AN75 DIODES [Diodes Incorporated], AN75 Datasheet
AN75
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AN75 Summary of contents
Page 1
... Gate and R T now a constant off-time when the power MOSFET is turned off. The on-time is based on the current Issue 1 – January 2011 © Diodes Incorporated 2010 is connected. For fixed off-time operation, the T pins, as shown in Figure 1. This converter has OSC 1 AN75 www.diodes.com ...
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... During this time, capacitors within the valley fill circuit (C1 and C2) are in series and charged via D2 and R1. If the capacitors have identical capacitance value, the peak voltage across C1 and C2 Issue 1 – January 2011 © Diodes Incorporated 2010 AL9910’s gate voltage) × Vac 373 V 2 AN75 to LED driver; Orange: IN www.diodes.com ...
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... (min kHz μ s − 373 V IN (max kHz μ AN75 = . The valley-fill capacitor μ − DROOP IN (min) LED is set to be 20V DROOP is given by, T Ω k www.diodes.com IN(min) in (max) ...
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... V (min) OFF = AN75 below 150kHz to avoid swi(max) in the output LED current the average pk × μ 297 the LD pin is tied to the VDD pin, and the RMS current rating of the pk × μ ...
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... The calculated MOSFET junction temperature, T J(MAX × 474 109 5 AN75 and V LED(min) × × × IN(max) pk FALL swi(max) 2 × × 65ns 63.8kHz 2 is given by, ⎞ ⎟ ⎟ ⎠ DS(ON) , must ...
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... IN (max) across the diode, the conduction power loss can be F × = 202 222 mW = × 222 AMB 6 AN75 to reduce the MOSFET’s F and V . IN(min) = 202 assumed to be 80ºC. θ AMB www.diodes.com = thJA ...
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... UCY2G150MPD ECE-A1HKG4R7 EEUEE2W100U ECQU2A104ML NFR0100001009JR500 19R685C B82791G2301N001 19R335C B72207S0271K101 SPB03N60S5 UB3C-10RF1 Any Any Any Any Any Any 7 AN75 Package Mfr. SO8 Diodes Inc. SMA Diodes Inc. DO201AD Diodes Inc. DF-S Diodes Inc. 5mm pitch Panasonic Rubicon Nichicon 1.5mm pitch Panasonic 5mm pitch Panasonic 17 ...
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... Figure 2 Top layer and bottom layer layout Issue 1 – January 2011 © Diodes Incorporated 2010 8 AN75 www.diodes.com ...
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... Figure 3 Picture of the LED T8 Fluorescent replacement lamp driver Issue 1 – January 2011 © Diodes Incorporated 2010 9 AN75 www.diodes.com ...
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... Figure 6 shows the power factor across the line voltage range. Power factor greater than 0.9 can be achieved at 85Vac. Figure 5 LED driver current regulation Issue 1 – January 2011 © Diodes Incorporated 2010 ) during part of the AC line cycle, driving the LED off. LED(max) Figure 4 LED driver system efficiency 10 AN75 IN(min) www.diodes.com ...
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... Moreover the document explains how to design a system with passive power factor correction to achieve PF greater than 0.7, allowing compliant with emergent international solid state lighting standards. Issue 1 – January 2011 © Diodes Incorporated 2010 Figure 6 LED driver power factor 11 AN75 www.diodes.com ...
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... Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2011, Diodes Incorporated www.diodes.com Issue 1 – January 2011 © Diodes Incorporated 2010 IMPORTANT NOTICE LIFE SUPPORT 12 AN75 www.diodes.com ...