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UBA2015P Datasheet(PDF) 6 Page - NXP Semiconductors |
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UBA2015P Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 42 page  UBA2016A_15_15A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Objective data sheet Rev. 1 — 20 May 2011 6 of 42 NXP Semiconductors UBA2016A/15/15A 600 V fluorescent lamp driver 7. Functional description 7.1 Introduction The UBA2016A/15/15A is an integrated circuit for electronically ballasted fluorescent lamps. It provides a critical conduction mode Power Factor Correction (PFC) controller/driver and a half-bridge controller/driver with all the necessary functions for correct preheat, ignition and on-state operation of the lamp. Several protection mechanisms are incorporated to ensure the safe operation of the fluorescent lamp or a shut down of the complete ballast under any abnormal operating conditions or lamp failure. 7.2 Power Factor Correction (PFC) The PFC is a boundary conduction mode, on-time controlled system. The basic application diagram can be found in Figure 6. This type of PFC operates at the boundary between continuous and discontinuous mode. Energy is stored in the inductor LPFC each period that switch QPFC is on. When the input current Ii(PFC) is zero at the moment that QPFC is switched on, the amplitude of the current build up in LPFC will be proportional to Vi(PFC) and the time ton(PFC) that QPFC is on. This current continues to flow as output current Io(PFC) via DPFC into CBUS after QPFC is switched off. In this phase Io(PFC) is equal to Ii(PFC). A new cycle is started when Io(PFC) reaches zero. Ii(PFC) consists of a sequence of triangular pulses, each having an amplitude proportional to the input voltage and ton(PFC). If ton(PFC) is kept constant, the first harmonic of the input current is proportional to the input voltage. The PFC output voltage Vo(PFC) is controlled by ton(PFC). As ton(PFC) is more slowly regulated than the mains frequency it will not disturb the power factor. BOOST 10 boost function input UBA2016A PH/EN 10 preheat frequency setting combined with enable UBA2015 and UBA2015A FBPFC 11 PFC feedback input COMPPFC 12 PFC output voltage feedback compensation AUXPFC 13 PFC auxiliary winding input GPFC 14 PFC gate driver output GND 15 ground VDD 16 supply GLHB 17 HB low-side switch gate driver output SHHB 18 HB high-side source connection FSHB 19 HB floating supply connection GHHB 20 HB high-side switch gate driver output Table 3. Pin description …continued Symbol Pin Description |
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