UM10466
UBA2015P reference design 230 V (AC)
Rev. 1.2 — 14 November 2011
User manual
Document information
Info
Keywords
Abstract
Content
UBA2015P, 2 x 28W/35W T5 fluorescent lamp ballast
This document describes the UBA2015P reference design for 230 V (AC).
NXP Semiconductors
UM10466
UBA2015P reference design 230 V (AC)
Revision history
Rev
v.1.2
v.1.1
v.1
Date
20111114
20110704
20110503
Description
third issue
second issue
first issue
Contact information
For more information, please visit:
http://www.nxp.com
For sales office addresses, please send an email to:
salesaddresses@nxp.com
UM10466
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.2 — 14 November 2011
2 of 18
NXP Semiconductors
UM10466
UBA2015P reference design 230 V (AC)
1. Introduction
This document describes the specification and use of the UBA2015P board. This
reference ballast design is intended to drive two TL5HE28W or TL5HE35W lamps.
019aac298
Fig 1.
UBA2015P reference board
Do not power the board without IC; the VDD decoupling capacitor voltage exceeds the
rated value when the IC does not limit the voltage to 13 V.
2. Safety warning
WARNING
Lethal voltage and fire ignition hazard
The non-insulated high voltages that are present when operating this product, constitute a
risk of electric shock, personal injury, death and/or ignition of fire.
This product is intended for evaluation purposes only. It shall be operated in a designated test
area by personnel qualified according to local requirements and labor laws to work with
non-insulated mains voltages and high-voltage circuits. This product shall never be operated
unattended.
The board needs to be connected to the mains voltage. Touching the board while it is
connected to the mains voltage must be avoided at all times. An isolated housing is
obligatory when used in uncontrolled, non laboratory environments. Galvanic isolation of
the mains phase using a variable transformer is always recommended.
019aab173
019aab174
a. Isolated
Fig 2.
Variac isolation symbols
b. Not isolated
UM10466
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.2 — 14 November 2011
3 of 18
NXP Semiconductors
UM10466
UBA2015P reference design 230 V (AC)
3. Specifications
Table 1.
Electrical board specification
Product(s)
electronic
programmed start with preheat
<1s
7
parallel
220 V (AC) to 240 V (AC)
50 Hz/60 Hz
2
none
IEC61547
Description
Ballast type
Starting method
Starting time
Lamp terminals
Lamp connection
Line voltage
Line frequency
Number of lamps
Dimming interface
Transient protection compatibility
Table 2.
Lamp type
35W T5
28W T5
Table 3.
Lamp type
35W T5
28W T5
Ballast performance
Number of Rated lamp Maximum THD
lamps
power (W)
(%)
2
2
35
28
10
10
Maximum lamp
current crest factor
1.7
1.7
Power factor
0.98
0.97
Nominal lamp
current (A)
0.170
0.170
Supported lamps
Description
35 W T5 high-efficiency fluorescent lamp
28 W T5 high-efficiency fluorescent lamp
4. Board information
4.1 Block diagram
The input section includes:
•
•
•
•
•
The fuse
Surge protection against fast AC transients
ElectroMagnetic Interference (EMI) filter
Full-wave rectifier
Preconditioner or Power Factor Correction (PFC)
The output of the PFC connects to a electrolytic buffer capacitor to supply the half-bridge
circuit. The lamp connects to the half-bridge circuit. The UBA2015P controller IC controls
the PFC and the half-bridge circuit.
The PFC is implemented as an up converter in boundary conduction mode. The resonant
circuit is voltage fed by the half-bridge which consists of two N-channel MOSFETs. The
resonant circuit includes a transformer for electrode (pre)heating.
UM10466
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.2 — 14 November 2011
4 of 18
NXP Semiconductors
UM10466
UBA2015P reference design 230 V (AC)
This type of topology with inductive heating is used in many commercial ballasts whose
power exceeds 25 W, making it a cost-effective application.
The lamps are connected in parallel.
mains
voltage
input
FUSE
SURGE
PROT
EMI
FILTER
AC
RECTIFIER
PFC
BUFFER
CAP
HALF
BRIDGE
RESONANT
CIRCUIT
lamps
UBA2015
CONTROLLER
019aac299
Fig 3.
Block diagram
4.2 Performance indicators
4.2.1 Input power, power factor and Total Harmonic Distortion (THD)
019aac290
(1)
1.0
Power factor,
THD
0.8
76.0
Power
(W)
75.8
75.6
0.6
75.4
0.4
75.2
0.2
(3)
(2)
75.0
0
180
200
220
240
74.8
260
280
Mains voltage (V)
Measured with a dummy lamp (resistors only)
(1) Power factor
(2) Current THD
(3) Input power (W)
Fig 4.
THD, power factor and input power as a function of AC mains input voltage
4.2.2 Lamp end of life detection
IEC asymmetrical power test: The End-Of-Life (EOL) resistor R
EOL
is increased (manually
controlled rheostat of 1 k) until the ballast shuts down. A rheostat is a two-terminal
variable resistor. See
IEC-61347-2-3 Section 17.3
where this test is described. When the
EOL voltage exceeds the thresholds of the internal window comparator the slow fault
timer (CPT pin) starts.
UM10466
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.2 — 14 November 2011
5 of 18
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