UBA2015AP datasheet(16/42 Pages) PHILIPS

16 / 42 page

UBA2016A_15_15A

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Objective data sheet

Rev. 1 — 20 May 2011

16 of 42

NXP Semiconductors

UBA2016A/15/15A

600 V fluorescent lamp driver

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.

Fig 12. Lamp current control

Rext(IFB)

Ri(IFB)

Cext(CF)

Ich(low)(CF)

clock

Vhigh(CF)

Ibias(DIM)

Vreg(ref)

DOUBLE SIDE

RECTIFIER

OTA

VOLTAGE

CONTROLLED

OSCILLATOR

VOLTAGE

CONTROLLED

CURRENT SOURCE

VDD

Cext(CIFB)

CIFB

gm(IFB)

VDD

IFB

Ilamp

BOOST

grey circuit parts are not present in some types

IBOOST

VDD

÷ 2

DIM

3.5

7.8

001aan205

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