UBA2016AP View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

UBA2016AP

600 V fluorescent lamp driver with PFC, linear dimming and boost function

NXP Semiconductors. 

NXP Semiconductors

UBA2016A/15/15A

600 V fluorescent lamp driver

Ilamp

DOUBLE SIDE

RECTIFIER

VDD

IFB

Rext(IFB)

Ri(IFB)

VDD

DIM

Ibias(DIM)

Vreg(ref)

VDD

1 3.5

OTA

gm(IFB)

VOLTAGE

CONTROLLED

OSCILLATOR

VDD

CIFB

Cext(CIFB)

VDD

Ich(low)(CF)

VOLTAGE

CONTROLLED

CURRENT SOURCE

IBOOST BOOST

1 1 7.8

Vhigh(CF)

÷2

clock

grey circuit parts are not present in some types

CF

Cext(CF)

001aan205

Fig 12. Lamp current control

The output of the OTA is connected to pin CIFB. The external capacitor Cext(CIFB) is

charged and discharged according to the voltage on the OTA inputs and the

transconductance of the OTA, gm(IFB) according to the formula:

ICIFB = gm(IFB)  (VIFB  Vreg(IFB).

More components can be connected to pin CIFB to improve the response time and

stability of the lamp current control loop.

Pin CIFB is connected to the input of the VCO (Voltage Controlled Oscillator) that

determines the frequency of the IC. Pin CIFB voltage is inversely proportional to the

switching frequency. When the load is inductive, an increase in frequency decreases the

lamp current, and a decrease in frequency increases the lamp current. With the closed

loop for the lamp current in place, the IC will regulate to the required frequency for the

desired lamp current. So when the IC enters Burn state it will go to either point D or H

shown in Figure 10 (UBA2015A) or Figure 11 (UBA2016A) depending on the DIM input

voltage.

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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