UBA2016AP datasheet(8/42 Pages) PHILIPS

8 / 42 page

UBA2016A_15_15A

All information provided in this document is subject to legal disclaimers.

Objective data sheet

Rev. 1 — 20 May 2011

8 of 42

NXP Semiconductors

UBA2016A/15/15A

600 V fluorescent lamp driver

7.2.2 Protection

The PFC incorporates the following protection mechanisms:

• When voltage on pin FBPFC drops below open/short protection threshold voltage

Vth(osp)(FBPFC), the gate is turned off and the start of a new cycle is inhibited. A small

internal filter prevents this protection reacting to a negative spike.

• When pin FBPFC is left open, a pull-down bias current Ibias(FBPFC) ensures that the pin

voltage drops below Vth(osp)(FBPFC).

• When voltage at pin FBPFC rises above overvoltage threshold voltage Vth(ov)(FBPFC)

the gate immediately turns off. A new cycle will not start while VFBPFC remains above

Vth(ov)(FBPFC). This limits the PFC output voltage. This protection is disabled during the

leading edge blanking time tleb(FBPFC) after GPFC goes high.

• When the toff(PFC)low timer sequence has ended with no demagnetization detected

(VAUXPFC has not risen above Vdet(demag)) the on-time of the next cycle will be the no

demagnetization detected PFC on-time ton(PFC)nodemag to prevent excessive current

build up in the coil.

• Bias current Ibias(AUXPFC) ensures that pin AUXPFC is HIGH when not connected

ensuring pin GPFC stays LOW.

7.3 Half-bridge driver

The IC incorporates drivers for the half-bridge switches and all related circuits such as

non-overlap, high voltage level shifter, bootstrap circuit for the floating supply and hard

switching and capacitive mode detection.

The UBA2016A/15/15A is designed to drive a half-bridge inverter with an inductive load.

The load consists typically of an inductor with a resonant capacitor and a TL or CFL. A

basic half-bridge application circuit driving a TL is shown in Figure 7 which also shows a

typical IC supply configuration with a start-up bleeder resistor and a dV/dt supply.

Fig 7.

Basic half-bridge and IC supply connection diagram

VBUS

UBA2016A

UBA2015

UBA2015A

VDD

GND

GHHB

SHHB

FSHB

GLHB

001aam534

UBA2016AP Datasheet(PDF) 8 Page - NXP Semiconductors

UBA2016AP Datasheet(HTML) 8 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Datasheet Download

Link URL