UBA2072 datasheet(3/28 Pages) PHILIPS

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UBA2072

Preliminary data sheet

Rev. 08.0 — February 2007

3 of 28

NXP Semiconductors

UBA2072

Low Voltage Full-bridge control IC for CCFL backlighting

Pinning information

6.1

Pinning

6.2

Pin description

Fig 2.

Pin assignment SO28 and SSOP28 package (top view)

Table 2:

Pin description

Symbol

Description

Function

IFB

current feedback input.

Input signal for the lamp current control loop. Should be connected to a

voltage proportional to the lamp current.

CIFB

current regulation

capacitor.

A capacitor must be connected between this pin and the signal ground. It sets

the time constant of the lamp current control loop.

VFB

voltage feedback input

Input signal for the voltage control loop. Should be connected to a voltage

proportional to the transformer output voltage

CVFB

voltage regulation

capacitor

A capacitor must be connected between this pin and the signal ground. It sets

the time constant of the voltage control loop.

IREF

reference current output

A 33k

Ω resistor must be connected between this pin and the signal ground.

The IC uses it to make accurate internal currents.

fault timing capacitor

A capacitor must be connected between this pin and the signal ground. It sets

the time that a fault condition is allowed before the IC shuts itself down.

SGND

signal ground

HF-oscillator timing

capacitor

A capacitor must be connected between this pin and the signal ground. It sets

the minimum switching frequency of the full bridge.

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