UBA2016AT datasheet(6/42 Pages) PHILIPS

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UBA2016A_15_15A

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Objective data sheet

Rev. 1 — 20 May 2011

6 of 42

NXP Semiconductors

UBA2016A/15/15A

600 V fluorescent lamp driver

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

boost function input UBA2016A

PH/EN

preheat frequency setting combined with enable UBA2015 and UBA2015A

FBPFC

PFC feedback input

COMPPFC

PFC output voltage feedback compensation

AUXPFC

PFC auxiliary winding input

GPFC

PFC gate driver output

GND

ground

VDD

supply

GLHB

HB low-side switch gate driver output

SHHB

HB high-side source connection

FSHB

HB floating supply connection

GHHB

HB high-side switch gate driver output

Table 3.

Pin description …continued

Symbol

Description

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