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UBA2016AP View Datasheet(PDF) - NXP Semiconductors.

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UBA2016AP Datasheet PDF : 42 Pages
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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.
VBUS
VDD
UBA2016A
UBA2015
UBA2015A
GHHB
SHHB
FSHB
GLHB
GND
Fig 7. Basic half-bridge and IC supply connection diagram
001aam534
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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