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UBA2015ATN1 View Datasheet(PDF) - NXP Semiconductors.

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NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
Table 3. Pin description …continued
Symbol Pin Description
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
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.
UBA2016A_15_15A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 16 November 2011
© NXP B.V. 2011. All rights reserved.
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