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UBA2017A Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer UBA2017A
Beschreibung 600V fluorescent lamp driver
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 29 Seiten
UBA2017A Datasheet, Funktion
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






UBA2017A Datasheet, Funktion
NXP Semiconductors
UBA2017/UBA2017A
600 V fluorescent lamp driver with linear dimming function
7.2.1 VDD supply
The UBA2017/UBA2017A is intended to be supplied by a start-up bleeder resistor
connected between the bus voltage VBUS and VDD and a dV/dt supply from the
half-bridge point at pin SHHB.
The IC starts up when the voltage at pin VDD rises above start-up voltage Vstartup(VDD) and
locks out (stops oscillating) when the voltage at pin VDD drops below stop voltage
Vstop(VDD). The hysteresis between the start and stop levels allows the IC to be supplied
by a buffer capacitor until the dV/dt supply is settled.
The UBA2017/UBA2017A has an internal VDD clamp. This is an internal active Zener (or
shunt regulator) that limits the voltage on the VDD supply pin to clamp voltage Vclamp(VDD).
No external Zener diode is needed in the dV/dt supply circuit if the maximum current of the
dV/dt supply minus the current consumption of the IC (mainly determined by the gate
drivers’ load) is below Iclamp(VDD).
7.2.2 Low- and high-side drivers
The low- and high-side drivers are identical. The output of each driver is connected to the
equivalent gate of an external power MOSFET. The high-side driver is supplied by the
bootstrap capacitor, which is charged from the VDD supply voltage via an internal diode
when the low-side power MOSFET is on. The low-side driver is directly supplied by the
VDD supply voltage.
7.2.3 Non-overlap
During each transition between the two states GLHB HIGH/GHHB LOW and
GLHB LOW/GHHB HIGH, GLHB and GHHB are both LOW for a fixed non-overlap time
tno to allow the half-bridge point to be charged or discharged by the load current
(assuming the load always has an inductive behavior), and enabling zero voltage
switching. See Figure 5.
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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UBA2017A pdf, datenblatt
NXP Semiconductors
UBA2017/UBA2017A
600 V fluorescent lamp driver with linear dimming function
Ilamp
DOUBLE SIDE
RECTIFIER
VDD
IFB
Rext(IFB)
Ri(IFB)
VDD
DIM
Ibias(DIM)
Vreg(ref)
OTA
gm(IFB)
VOLTAGE
CONTROLLED
OSCILLATOR
VDD
CIFB
Cext(CIFB)
VDD
Ich(low)(CF)
VOLTAGE
CONTROLLED
CURRENT SOURCE
Vhigh(CF)
/ 2 clock
CF
Cext(CF)
aaa-001481
DIM input is only present in the UBA2017A
Fig 8. Lamp current control
The output of the OTA is connected to pin CIFB. The external capacitor Cext(CIFB) is
charged and discharged according to the voltage on the OTA inputs and the
transconductance of the OTA, gm(IFB) according to the formula:
ICIFB = gm(IFB) × (VIFB Vreg(IFB).
More components can be connected to pin CIFB to improve the response time and
stability of the lamp current control loop.
Pin CIFB is connected to the input of the VCO (Voltage Controlled Oscillator) that
determines the frequency of the IC. Pin CIFB voltage is inversely proportional to the
switching frequency. When the load is inductive, an increase in frequency decreases the
lamp current, and a decrease in frequency increases the lamp current. With the closed
loop for the lamp current in place, the IC will regulate to the required frequency for the
desired lamp current. So when the IC enters the Burn state it will go to either point D or H
shown in Figure 7 depending on the DIM input voltage or 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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