PDF AND8016D Data sheet ( Hoja de datos )

Número de pieza	AND8016D
Descripción	Design of Power Factor Correction Circuit Using Greenline Compact Power Factor Controller
Fabricantes	ON Semiconductor
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No Preview Available ! AND8016/D Design of Power Factor Correction Circuit Using Greenline™ Compact Power Factor Controller MC33260 http://onsemi.com Prepared by Ming Hian Chew ON Semiconductor Analog Applications Engineering APPLICATION NOTE Introduction of external components, the MC33260 can control the The MC33260 is an active power factor controller that follower boost operation that is an innovative mode functions as a boost pre–converter which, meeting allowing a drastic size reduction of both the inductor and the international standard requirement in electronic ballast and power switch. Ultimately, the solution system cost is off–line power supply application. MC33260 is designed to significantly lowered. drive a free running frequency discontinuous mode, it can Also able to function in a traditional way (constant output also be synchronized and in any case, it features very voltage regulation level), any intermediary solutions can be effective protections that ensure a safe and reliable easily implemented. This flexibility makes it ideal to operation. optimally cope with a wide range of applications. This circuit is also optimized to offer extremely compact This application note will discuss on the design of power and cost effective PFC solutions. It does not entail the need factor correction circuit with MC33260 with traditional of auxiliary winding for zero current detection hence a boost constant output voltage regulation level operation and simple coil can be used instead of a transformer if the follower boost variable output voltage regulation level MC33260 Vcc is drawn from the load (please refer to page operation. For derivation of the design equations related to 19 of the data sheet). While it requires a minimum number the IC please refer to MC33260 data sheet. D1 D3 D2 D4 C1 R6 D5 R7 + D7 C4 R2 R1 C2 C3 18 27 MC33260 36 45 R3 R5 R4 L1 D5 Q1 + C5 C6 Figure 1. Application Schematic of MC33260 PFC Techniques cost. This paper will discuss design of PFC with MC33260, Many PFC techniques have been proposed, boost which operates in critical conduction mode. topology, which can operate in continuous and discontinuous mode, is the most popular. Typically, continuous mode is more favorable for high power application for having lower peak current. On the other hand, for less than 500 W application, discontinuous mode offers smaller inductor size, minimal parts count and lowest Discontinuous Conduction Mode Operation Critical conduction mode operation presents two major advantages in PFC application. For critical conduction mode, the inductor current must fall to zero before start the next cycle. This operation results in higher efficiency and © Semiconductor Components Industries, LLC, 2002 June, 2002 – Rev. 1 1 Publication Order Number: AND8016/D http://www.Datasheet4U.com 1 page AND8016/D reverse–biased under normal operating conditions. If load overcurrent pulls down Vo, Dbypass conducts, but this is probably preferable to having the high current flowing through boost inductor. Dbypass PFC IC + VOUT VAC Figure 3. Rectifier bypass of start–up inrush current 2. External Inrush Current Limiting Circuit For low power system, a thermistor in series with the pre–converter input will limit the inrush current. Concern is the thermistor may not respond fast enough to provide protection after a line dropout of a few cycles. A series input resistor shunted by a Triac or SCR is a more efficient approach. A control circuit is necessary. This method can function on a cycle–by–cycle basis for protection after a dropout. Load Overcurrent Limiting If an overcurrent condition occurs and exceeds the boost converter power limit established by the control circuit, Vo will eventually be dragged down below the peak value of the AC line voltage. If this happens, current will rise rapidly and without limit through the series inductor and rectifier. This may result in saturation of the inductor and components will fail. The control circuit holds off the shunt switch, since the current limit function is activated. It cannot help to turn the switch ON – the inductor current will rise even more rapidly and switch failure will occur. Typically, a power factor correction circuit is connected to another systems like switched mode power supply or electronic ballast. These downstream converters typically will have current limiting capability, eliminating concern about load faults. However, a downstream converter or the bulk capacitor might fail. Hence there is a possibility of a short circuit at the load. If it is considered necessary to limit the current to a safe value in the event of a downstream fault, some means external to the boost converter must be provided. Design Example I – Traditional Boost Constant Output Voltage Regulation Level Operation Power Factor Correction The basic design specification concerns the following: • Mains Voltage Range: Vac(LL) – Vac(HL) = 85 – 265 Vac • Regulated DC Output Voltage: Vo = 400 Vdc • Rated Output Power: Po = 80 W • Expected Efficiency, h > 90% A. The input power, Pin is given by Pin + Po η + 80 0.92 + 86.96 W B. Input diode current is maximum at Vinrms = Vac(LL) Iinpk + Ǹ2 Po ηVac(LL) + Ǹ2 0.92 80 85 + 1.447 A C. Inductor design 1. Inductor peak current: ILpk + 2Iinpk + 2 1.447 + 2.894 A 2. Inductor value: 2 Lp + ǒ Ǔttotal Vo Ǹ2 * Vac(LL) Vac(LL) Vo ILpk ǒ Ǔ2 + 40 106 400 Ǹ2 85 400 2.894 85 + 1.162 mH Let the switching cycle t = 40 ms for universal input (85 to 265 Vac) operation. 3. The number of turns required for a selected core size and material is: NP + LPILpk106 BmaxAe + 1.162 103 0.3 2.894 60 106 + 186.8 turns [ 187 turns Using EPCOS E 30/15/7, Bmax =0.3 T and Ae = 60 mm2. 4. The required air gap to achieve the correct inductance and storage is: lgap + 4p107N2p LP Ae + 4p 107 1872 60 1.162 103 106 + 2.269 mm 5. Design of Auxiliary Winding ǒ ǓNaux + Vaux NP Vo * Vac(HL) + 14 (400 187 * 265) + 19.4 turns [ 20 turns Round up to 20 turns to make sure enough voltage at the auxiliary winding. http://onsemi.com 5 http://www.Datasheet4U.com 5 Page Notes AND8016/D http://onsemi.com 11 http://www.Datasheet4U.com 11 Page

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