UM10561
UBA2017AT reference design for 420 V (DC)
Rev. 1 — 13 August 2012
User manual
Document information
Info
Keywords
Abstract
Content
UBA2017AT, dimmable, 2 x T5 35 W ballast
This user manual describes the performance, technical data and wiring of
the 420 V (DC) UBA2017AT reference design. This dimmable design
drives two 35 W T5 lamps.
NXP Semiconductors
UM10561
UBA2017AT reference design for 420 V (DC)
Revision history
Rev
v.1
Date
20120813
Description
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
UM10561
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1 — 13 August 2012
2 of 24
NXP Semiconductors
UM10561
UBA2017AT reference design for 420 V (DC)
1. Introduction
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 UBA2017AT reference design is intended to serve as an example of a dimmable two
lamp ballast. This user manual describes the specification and use of the UBA2017AT
board. This reference ballast design is intended to drive two T5 35 W lamps.
a. Top view.
b. Bottom view.
Fig 1.
Photograph of the UBA2017AT reference design
2. Safety warning
Connected the board to the DC voltage. Avoid touching the board while it is connected to
the mains voltage. An isolated housing is mandatory when used in uncontrolled,
non-laboratory environments.
UM10561
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1 — 13 August 2012
3 of 24
NXP Semiconductors
UM10561
UBA2017AT reference design for 420 V (DC)
3. Specifications
Table 1.
Parameter
ballast type
starting method
starting time
lamp terminals
line voltage
lamp type
number of lamps
dimming interface
Table 2.
Lamp type
Ballast performance
Number of
lamps
2
Lamp power I
lamp
(W)
maximum crest
factor
35
1.7
nominal
(A)
0.17
minimum
(mA)
5
Specifications for the reference board
Comment
electronic
programmed start with preheat
<1s
7
420 V(DC); in the range 400 V(DC) to 440 V(DC)
T5 35 W
2
1 V to 10 V
T5 35 W
DC supply, pin 1 (red)
DC supply ground, pin 2 (black)
chassis, pin 3 (green/yellow)
X1
DIM+, pin 4 (violet)
DIM-, pin 5 (grey)
REFERENCE DESIGN
pin 1
pin 2
pin 3
pin 4
X3
pin 5
pin 6
pin 7
MH1
LAMP
LAMP
aaa-003763
Fig 2.
Wiring diagram
Remark:
Connected the ballast as shown in
Figure 2.
When no dimming is needed, do
not connect the (floating) DIM input.
Remark:
The chassis connection must connect to the earth using mounting hole MH1.
UM10561
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1 — 13 August 2012
4 of 24
NXP Semiconductors
UM10561
UBA2017AT reference design for 420 V (DC)
3.1 Dimming without using an external voltage source
The ballast is dimmed using a voltage source of 1 V (DC) to 10 V (DC) connected to
connector X1.
It is also possible to dim using an external logarithmic potentiometer of 470 k (for
example, no external voltage supply is available). The potentiometer must connect pins 5
(gray wire, DIM) and 4 (violet wire, DIM+) of connector X1.
4. Performance data
4.1 Dimming curve
200
I
dch
160
aaa-003764
120
80
40
0
0
2
4
6
8
V
i(dim)
(V)
10
Measured using an AC coupled current probe.
Fig 3.
RMS lamp discharge current as function of the DIM input voltage
UM10561
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1 — 13 August 2012
5 of 24
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