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PDF UBA2017 Data sheet ( Hoja de datos )

Número de pieza UBA2017
Descripción 600V fluorescent lamp driver
Fabricantes NXP Semiconductors 
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No Preview Available ! UBA2017 Hoja de datos, Descripción, Manual

UBA2017/UBA2017A
600 V fluorescent lamp driver with linear dimming function
Rev. 2 — 15 May 2012
Product data sheet
1. General description
The UBA2017/UBA2017A are high-voltage Integrated Circuits (IC) intended to drive
fluorescent lamps with filaments such as Tube Lamps (TL) and Compact Fluorescent
Lamps (CFL) in general lighting applications. The IC comprises a fluorescent lamp control
module, half-bridge driver and several protection mechanisms. The IC drives fluorescent
lamps using a half-bridge circuit made of two MOSFETs with a supply voltage of up to
600 V.
The UBA2017/UBA2017A are supplied by a start-up bleeder resistor and a dV/dt supply
from the half-bridge circuit, or any other auxiliary supply derived from the half-bridge. The
supply current of the IC is low. An internal clamp limits the supply voltage.
2. Features and benefits
Half-bridge driver features:
Integrated level-shifter for the high-side driver of the half-bridge
Integrated bootstrap diode for the high-side driver supply of the half-bridge
Independent non-overlap time
Fluorescent lamp controller features:
Linear dimming (UBA2017A only)
EOL (End-Of-Life) detection (both symmetrical and asymmetrical)
Adjustable preheat time
Adjustable preheat current
Adjustable fixed frequency preheat
Lamp ignition failure detection
Ignition detection of all lamps at multiple lamps with separate resonant tanks
Second ignition attempt if first failed
Constant output power independent of mains voltage variations
Automatic restart after changing lamps
Lamp current control
Enable input
Protection
Hard switching/capacitive mode protection
Half-bridge overcurrent (coil saturation) protection
Lamp overvoltage (lamp removal) protection
Temperature protection

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UBA2017 pdf
NXP Semiconductors
UBA2017/UBA2017A
600 V fluorescent lamp driver with linear dimming function
7. Functional description
7.1 Introduction
The UBA2017/UBA2017A is an integrated circuit for electronically ballasted fluorescent
lamps. It provides a half-bridge controller/driver with all the necessary functions for correct
preheat, ignition and on-state operation of the lamp. Several protection mechanisms are
incorporated to ensure the safe operation of the fluorescent lamp or a shutdown of the
complete ballast under any abnormal operating conditions or lamp failure.
7.2 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 UBA2017/UBA2017A 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 4 which also shows a
typical IC supply configuration with a start-up bleeder resistor and a dV/dt supply.
VBUS
VDD
UBA2017
UBA2017A
GHHB
SHHB
FSHB
GLHB
GND
Fig 4. Basic half-bridge and IC supply connection diagram
aaa-001479
UBA2017
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 15 May 2012
© NXP B.V. 2012. All rights reserved.
5 of 29

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UBA2017 arduino
NXP Semiconductors
UBA2017/UBA2017A
600 V fluorescent lamp driver with linear dimming function
If either saturation or overvoltage is triggered, it overrules the frequency sweep-down and
hold the frequency at the border where the fault appeared and start the fault timer. When
the fault time-out tto(fault) is reached the IC enters the Auto-restart state if it was the first
ignition attempt, otherwise it enters the Stop state; see Figure 6 “State diagram”.
7.3.6 Auto-restart
The Auto-restart state is entered after a fault time-out in the Ignition state during the first
ignition attempt. See Figure 6 “State diagram”. When the IC is in the Auto-restart state, it
draws supply current Irestart(VDD). This slowly discharges the buffer capacitor on pin VDD
until the voltage on this pin drops below Vrestart(VDD). The IC then enters the Standby state.
Here the VDD capacitor is charged again to start a second ignition attempt. The bleeder
current must be between standby current Istb(VDD) and Irestart(VDD). A time delay can be set
between the two ignition attempts with the capacitor at pin VDD to reduce stress on the
HB components.
7.3.7 Burn
In the Burn state, the lamp current regulation and all protection circuits are active.
7.3.7.1 Lamp current control and dimming
The AC lamp current is sensed by an external resistor connected to pin IFB. The resulting
AC voltage on pin IFB is internally Double-Side Rectified (DSR), and compared to a
reference level by an OTA. This reference level is determined by the internal reference
regulation level Vreg(ref) and the voltage on the DIM input (UBA2017A only), as shown in
Figure 8 “Lamp current control”.
Definition: the regulation voltage on pin IFB (Vreg(IFB)) is the level seen from outside the IC
to which the IC tries to regulate the average absolute voltage on pin IFB.
If the DIM input is not present or not connected or VDIM > Vreg(ref) then Vreg(IFB) is
Vreg(ref) + non-idealities from the OTA and the DSR else Vreg(IFB) = VDIM + non-idealities
from OTA and DSR.
The DIM input controls the lamp current set point (UBA2017A only). The DIM input level is
internally clamped to Vreg(ref). The lowest possible DIM input level is set by the bias current
on pin DIM Ibias(DIM) and the external resistance on the pin. If no dimming is required, pin
DIM can be left open or connected via a capacitor to ground. The internal current source
Ibias(DIM) will then charge the pin until it is internally clamped to Vreg(ref).
UBA2017
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 15 May 2012
© NXP B.V. 2012. All rights reserved.
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