uba2015t/n1 NXP Semiconductors, uba2015t/n1 Datasheet - Page 8

• Manufacturer Part Number: uba2015t/n1
• Description: 600 V Fluorescent Lamp Driver With Pfc, Linear Dimming And Boost Function
• Manufacturer: NXP Semiconductors

NXP Semiconductors
UBA2016A_15_15A
Objective data sheet
7.2.2 Protection
7.3 Half-bridge driver
The PFC incorporates the following protection mechanisms:
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
typical IC supply configuration with a start-up bleeder resistor and a dV/dt supply.
Fig 7.
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•
•
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When voltage on pin FBPFC drops below open/short protection threshold voltage
V
internal filter prevents this protection reacting to a negative spike.
When pin FBPFC is left open, a pull-down bias current I
voltage drops below V
When voltage at pin FBPFC rises above overvoltage threshold voltage V
the gate immediately turns off. A new cycle will not start while V
V
leading edge blanking time t
When the t
(V
demagnetization detected PFC on-time t
build up in the coil.
Bias current I
ensuring pin GPFC stays LOW.
th(osp)(FBPFC)
th(ov)(FBPFC)
AUXPFC
Basic half-bridge and IC supply connection diagram
has not risen above V
off(PFC)low
All information provided in this document is subject to legal disclaimers.
. This limits the PFC output voltage. This protection is disabled during the
bias(AUXPFC)
, the gate is turned off and the start of a new cycle is inhibited. A small
V
BUS
Rev. 1 — 20 May 2011
timer sequence has ended with no demagnetization detected
UBA2016A
UBA2015A
UBA2015
th(osp)(FBPFC)
ensures that pin AUXPFC is HIGH when not connected
VDD
GND
leb(FBPFC)
det(demag)
GHHB
SHHB
FSHB
GLHB
.
after GPFC goes high.
) the on-time of the next cycle will be the no
on(PFC)nodemag
UBA2016A/15/15A
600 V fluorescent lamp driver
to prevent excessive current
bias(FBPFC)
Figure 7
001aam534
FBPFC
which also shows a
ensures that the pin
© NXP B.V. 2011. All rights reserved.
remains above
th(ov)(FBPFC)
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