NXP Semiconductors UBA2021 User manual

UM10412
UBA2021 evaluation board
Rev. 1 — 2 November 2010 User manual
Document information
Info Content
Keywords UBA2021, evaluation board, TL, CFL
Abstract This document is the user manual for the UBA2021 evaluation board.

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Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
NXP Semiconductors UM10412
UBA2021 evaluation board
Revision history
Rev Date Description
01 20101102 First issue

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UBA2021 evaluation board
1. Introduction
This document describes the UBA2021 main board in combination with the UBA2021
daughter board. The main board is designed to be a flexible platform for demonstrating
the functionality of the UBA2014 and UBA2021 fluorescent tube drivers in different
applications. Please note that this board is not a complete ballast design for fluorescent
tubes. The default setup permits a T5 HE 35 W fluorescent lamp to be demonstrated.
2. Safety warnings and cautions
Remark: Galvanic isolation of the mains phase using a variable transformer is always
recommended. These devices can be recognized by the symbols shown in Figure 1.
The board is intended as an evaluation board to build different TL and or CFL
applications. To optimize flexibility, almost no protection is build in (except for IC internal
protection). The board does not conform with any safety norm.
CAUTIONS:
•Do not supply voltages to the board without a daughter board correctly inserted.
Failing to do so may damage the board.
•Always operate with burner (lamp) connected to the board and connected to the
resonant circuit. Failing to do so may damage the board.
•Do not use the UBA2021 daughter board in combination with the (old) V1.1 main
board. The V1.1 board is blue instead of green.
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.
a. Isolated b. Not isolated
Fig 1. Variac isolation symbols
019aaa69
0
019aaa69
1

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UBA2021 evaluation board
3. Board description
The board consists of two separate PCBs. The main board with the resonance circuit and
a small daughter board with the UBA2021 IC.
3.1 Daughter board
The daughter board contains the UBA2021 IC with the preheat, sweep and oscillator
capacitors, the low voltage supply (VDD) components and some other low voltage
components.
The daughter PCB can easily be replaced if it becomes damaged. Care should be taken
that the board is inserted properly and to assist this, pin 11 has been removed from the
daughter board to prevent inserting the board incorrectly.
3.2 Main board
The main board has been designed for both TL or CFL applications and comprises the
following:
•DC and AC input connectors
•Dimming input
•Two sockets for FETs
•Two different transformers
•Area for experiments
•Connectors for up to four burners
Fig 2. Daughter board
019aaa28
3

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Fig 3. UBA2014/21 Main board with UBA2021 daughter board inserted
019aaa28
9

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UBA2021 evaluation board
4. Schematics
Figure 4 is a schematic of the daughter board with the UBA2021 IC. The component
values for the oscillator and sweep are RREF = 30 kΩ, CF = 100 pF, CP = 330 nF. These
values will give a minimum oscillator frequency of 39.5 kHz and a preheat time of 1.85 s.
Fig 4. Daughter board with UBA2021 circuit
019aaa28
4
30 kΩ
R3
C1 A1
100 nF
C2
330 nF/16 V
C3
100 pF
12
47 Ω
R4
21
150 kΩ
R1
12
150 kΩ
R2
12
160 kΩ
R8
12
21
21
2CI
13
114 RHV Vbrg
SH
C4
C6
470 pF/
500 V
100 nF
V1
V2
BAS29
V3
BAS29
X2
TP
BAS29
12
1
2
C8
1 nF/
100 V
1
2
1
2
C7
1 μF/
25 V
1
2
C9
10 nF/
50 V
1
2
1
Pin 11 is cut off
for correct insertion
2
X1
header 13
C10
2.2 nF/
100 V
1
2
1
E
E
CC
13
B
B
2
R6
1 kΩ
R5
10 kΩ
V5
BC847C
V4
BC857C
R7
3.3 kΩ
1
1
2
2
C5
DNP
1
2
21
UBA2021P
2G1 GH
3S1
PCS_2021
1FS
6G2 GL
4n.c.
5VS VDD
7PGND
CP 8
CF 12
RREF 10
SGND 11
RS 9
12
11
10
9
8
7
6
5
PCS_2021
GL
Vbrg
GH
SH
4
3
2
1

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UBA2021 evaluation board
Fig 5. Main board half-bridge and resonance circuit - version R1C
019aaa28
6
43 kΩ
R22
12
0 Ω
R2
21
1X90 TP
1X92 TP
1X94 TP
1X96 TP
X78 TP
0 Ω
R4
2
12
10
9
7
2
1
1
2
1
2
1
6
1
43 kΩ
R23
12
5.6 kΩ
R38
12
0 Ω
R39
1.2 kΩ
R37
1
1
LVS 2
47 kΩ
R24
12
C1
Cdc 68 nF/400 V
12
C4
33 nF/100 V
760 870 401
T1
X114
header 2
X115
header 2
X2
socket 3
12
C5
33 nF/100 V
12
47 kΩ
R25
12
D
placed in header
V6
2SK3569
S
G
D
placed in header
V3
2SK3569
S
G
Y5
jumper
C6
4.7 nF
2000 V
1
2
C19
470 nF
63 V
1
CSN
123
2
C17
680 nF
50 V
1
2
C12
1 nF
100 V
1
2
C11
10 nF
100 V
1
2
C18
2.2 nF
100 V
1
2
1
2
R36
56 kΩ
1
2
R35
56 kΩ
1
2
R10
33 Ω
2 W
1
2
R9
1 Ω
2 W
1
2
R8
1 Ω
2 W
1
2
R6
1 Ω
2 W
1
2
1
2
R32
100 kΩ
R31
1 kΩ
1
2
V16
1N4937
1
1
2
2
V12
1N4937
V11
1N4937
Y6
jumper
Y10
jumper
Y8
jumper
Y9
jumper
PCS_2021
PCS
LCS
lamp current sense circuit
GL
SH
GH
33 Ω
R3
12
33 Ω
R1
12
8.2 kΩ
R5
12
1 kΩ
R7
12
220 kΩ
R20
1
VDC
Vbrg
2
2
3
1X14
socket 3
2
3
1CSN
connection for daughterboard
ground connections for
oscilloscope probes
1X89
socket 13
header 2
X34
1
2
Y7
jumper
header 2
X32
1
2
1X39
header 3
X33
header 3
2
3
X79 TP 2CSP1
X80 TP 3Vref1
X81 TP 4LVS1
X82 TP 5SH1
X83 TP 6GH1
X84 TP 7PCS1
X85 TP 8Vbrg1
X86 TP 9GL1
X87 TP 101
1
X104
TP
11
X88 TP 12VDD
connector position 11
glued sealed to prevent
erroneous insertion of
daughterboard
1
X120 TP 13PCS_20211
1
X105
TP
1
X106
TP
1
X107
TP
1
X102
TP
1
X108
TP
1
X103
TP
1
X109
TP

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UBA2021 evaluation board
Fig 6. Main board input section
019aaa28
7
R27
75 kΩ
C16
47 μF/
350 V
1N4937
V1
1.5 mH
L1
Fuseholder 5x20
F1
2A
F2 Y12
Cover
X3
MKDS 2.5/2-5.08
V2
GBU8K
C15
47 μF/
350 V
VDC
2
1
R33
75 kΩ
2
1
R29
75 kΩ
2
1
R34
75 kΩ
2
1
1
2
1
12
14
2
3
2
C3
47 nF/
305 Vac
1
2
C2
47 nF/
305 Vac
1
1
1
2
2
2
X1
VAC In = 230 V 50 Hz
VDC In = 400 V
MKDS 2.5/2-5.08
1
2
Fig 7. Main board dimming input (only in combination with UBA2014 daughter board)
019aaa28
5
R19
11 kΩ
33 kΩ
V15
DNP
C14
10 nF/
100 V
R18
75 kΩ
R40
X68
MKDS 2.5/2-5.08
External
dimming voltage
0 V to 10 V
1
1
12
2
1
2
1
2
12
2
VDD
CSP
Fig 8. Main board transformer T2/T3
019aaa30
0
11
1
1
1
1
1
1
1
1
1
10 X70 TP
X67 X70
9X72 TP X72
8X74 TP X74
7X76 TP X76
X67 TP
SH
2X69
X69 TP
3X73
X73 TP
4X75
X75 TP
5X77
2 mH
T2
DNP
15 μH
15 μH
2.5 mH
3 mH
3.5 mH
4 mH
X77 TP
6X91
X91 TP
21
X117
header 2
Y11
jumper

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UBA2021 evaluation board
Fig 9. Main board lamp connectors and experimental area
019aaa2
88
X110
header 2
12
X111
header 2
12
X112
header 2
12
X113
header 2
X8
LAMP 4
EXPERIMENTING AREAEXPERIMENTING AREA
MKDS 2.2/4-5.08
1
11
X6 TP
2
Y3
jumper
Y1
jumper
Y4
jumper
Y2
jumper
12
X9 TP
13
X11 TP
14
X13 TP
X21
LAMP 3
MKDS 2.2/4-5.08
11
X20 TP
12
X24 TP
13
X27 TP
14
X30 TP
X42
LAMP 2
MKDS 2.2/4-5.08
11
X38 TP
12
X41 TP
13
X46 TP
14
X49 TP
X56
LAMP 1
MKDS 2.2/4-5.08
11
X55 TP
12
X59 TP
13
X62 TP
14
X65 TP
1X90 TP
1X92 TP
1X94 TP
1X96 TP
1X19 TP
X17 TP
1
SH
1X23 TP
1X26 TP
1X29 TP
X31 TP
X18 TP
X22 TP
X25 TP
X28 TP
1
X15 TP
1
1X37 TP
X35 TP
1
SH
1X40 TP
1X45 TP
1X48 TP
X50 TP
X36 TP
X43 TP
X44 TP
X47 TP
1
1X54 TP
X52 TP
1
SH
1X58 TP
1X61 TP
1X64 TP
X66 TP
X53 TP
X57 TP
X60 TP
X63 TP
1

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5. Connectors
5.1 Power supply connectors
The board can be supplied by either a high voltage DC or a mains AC input. For most
applications the high voltage DC input should be used. In the final product, a PFC of
choice may be used to replace the high voltage DC supply.
For some applications (such as CFL applications) the rectified mains is sufficient. In these
cases a mains input of 230 VAC may be used.
5.2 Dimming input
The UBA2021 does not have dimming functionality so this input is not used. If dimming is
required, please use the UBA2014.
5.3 Lamp connectors
There are four lamp connectors on the board. The connectors are listed in Table 3,
Table 4, Table 5 and Table 6, together with the names of the test points that are connected
to them.
Table 1. DC high voltage input connector X1
Connector Signal Comment
X1-1 + + 400 V DC in
X1-2 GND Ground
Table 2. AC input connector X3
Connector Signal Comment
X3-1 ~ Mains 230 V AC
X3-2 ~ Mains 230 V AC
Table 3. Lamp 1 (X56)
TP Comment
X55 connection for filament 1
X59 connection for filament 1
X62 connection for filament 2
X65 connection for filament 2
Table 4. Lamp 2 (X42)
TP Comment
X38 connection for filament 1
X41 connection for filament 1
X46 connection for filament 2
X49 connection for filament 2

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5.4 Test points
Eight black ground pins (X102 to X109) are distributed over the board so that
(oscilloscope) probes can be grounded without the need for long grounding wires.
Remark: A test pin is available for each pin of the daughter board.
Table 5. Lamp 3 (X21)
TP Comment
X20 connection for filament 1
X24 connection for filament 1
X27 connection for filament 2
X30 connection for filament 2
Table 6. Lamp 4 (X8)
TP Comment
X6 connection for filament 1
X9 connection for filament 1
X11 connection for filament 2
X13 connection for filament 2
Table 7. Connections of the daughter board
Test Pin Name Comment
X78 CSN negative input for the average current sensor for UBA2014
daughter board
X79 CSP positive input for the average current sensor for UBA2014
daughter board
X80 Vref reference voltage output for UBA2014 daughter board
X81 LVS lamp voltage sensor input for UBA2014 daughter board
X82 SH source for the high-side switch
X83 GH gate output for the high-side switch
X84 PCS preheat current sensor input for UBA2014 daughter board
X85 Vbrg Connection to VDC via R20 (220 kΩ)
X86 GL gate output for the low-side switch
X87 GND ground
X88 VDD low voltage supply
X120 PCS_2021 preheat current sense for the UBA2021 daughter board

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5.5 Transformer T1
In the default setup, transformer T1 will be used and is connected with jumpers to lamp
connector 4 (X 8). The transformer specifications are listed in Section 6.
5.6 FET
Two NMOST FETs should be placed in X2 and X14. The supplied NMOST's are Toshiba
2SK3569 (VDS = 600 V; ID= 10 A; RDSon = 0.54 Ω). When using different NMOS types, the
values of gate resistors R1 and R3 (default 33 Ω) maybe changed.
5.7 Current sense selection
A feed forward mechanism in the UBA2021 ensures that the lamp power will not increase
above the maximum allowed value due to an increased mains voltage. This means that
the operating frequency is controlled by the bus voltage rather than by the lamp current or
the half-bridge current.
5.7.1 Half-bridge current sensing
The half-bridge current is sensed for controlling the preheat current. Different values of
the sense resistor can be selected using jumpers X32 and X34. To connect the lamp to
ground, X39 should be shorted between pin 2 and pin 3.
5.7.2 Lamp current sensing
The UBA2021 does not sense the lamp current, so X39 should be shorted between pin 2
and pin 3 in order to connect the lamp to ground.
Table 8. Default connection transformer T1
Header Comment
X110 Insert to connect T1 to filament 1, lamp 4
X111 Insert to connect T1 to filament 1, lamp 4
X112 Insert to connect T1 to filament 2, lamp 4
X113 Insert to connect T1 to filament 2, lamp 4
X114 Insert to connect SH to transformer T1
X115 Insert to connect T1 to resonant capacitor C6 (4.7 nF, 2000 V)
Table 9. Current sensing selection
X33 pins 1 and 2 pins 2 and 3
half-bridge open open
lamp current open open
Table 10. Current sensing selection
X32 X34 Resistance
short short 0.5 Ω
short open 1.0 Ω
open short 1.5 Ω
open open 2.0 Ω

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5.8 Using transformer T3
The jumper X117 should be inserted to use the flexible transformer T3. This will connect
SH to pin 1 of the transformer. Table 11 shows the different inductance values. The
specifications of the transformer are listed in Section 6.
Transformer T3 has a double footprint that enables the use of different types of
transformers. The transformers are referred to as T2 and T3 on the schematic drawings.
Table 11. Transformer T3 primary connections - Inductance to pin 1 (X67)
Connection Inductance
X69 2.0 mH
X73 2.5 mH
X75 3.0 mH
X77 3.5 mH
X91 4.0 mH
Table 12. Transformer T3 secondary connections
Connection Inductance
X70-X72 15 μH
X74-X76 15 μH

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6. Transformer specifications
6.1 Transformer T1
6.1.1 Schematic diagram
•Manufacturer: Würth Elektronik
•Part number: 760870401
6.1.2 Winding specification
6.1.3 Dimensions
•Core: RM-8 (Ferroxcube RM/I or equivalent)
•Core material: 3F3, N87 or equivalent
•Bobbin: RM-8 (12 pin, vertical type)
Fig 10. Transformer T1 schematic diagram
019aaa30
1
N3
10
12
7
9
6
1
N2
N1
Table 13. Electrical characteristics for transformer T1
Properties Test conditions Value Unit Tolerance
Inductance N1 50 kHz/0.1 V L02.9 mH ±5 %
Turns ratio N1 - N5 N1: N2: N3 TR 26.1 : 1 : 1 ±3 %
DC-resistance N1 at 20 °C RDC1 2.7 Ωmaximum
DC-resistance N2 at 20 °C RDC2 180 mΩmaximum
DC-resistance N3 at 20 °C RDC3 180 mΩmaximum
Saturation current N1 dL/L=20 % ISAT 1.6 A typical
Leakage inductance N1 200 kHz/0.1 V rest shorted LS350 μHmaximum
Coupling capacitance 20 kHz/1 V all windings CWW 11.0 pF typical
Hipot test 3 mA, 1s all windings HV 1.2 kV

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6.2 Transformer T3
6.2.1 Schematic diagram
•Manufacturer: Würth Elektronik
•Part number: 760870402
Fig 11. Transformer T1
019aaa25
1
21.59 mm
(max)
21.59 mm
(max)
17.27 mm
(max)
12
11
10 1
23
4
5
6
7
89
Fig 12. Transformer T3 schematic diagram
019aaa30
2
N7
9
10
7
8
6
1
2
N6
N1
N2
3N3
4N4
5N5
Table 14. Electrical characteristics for transformer T3
Properties Test conditions Value Unit Tolerance
InductanceN1-N5 50 kHz/0.1 V L04.0 mH ±5 %
Turns ratio N1 - N5 N1: N2: N3: N4: N5: N6: N7 TR 12 : 1.33, 1.25 : 1.17, 1.17 : 1:1 ±3 %
DC-resistance N1-N5 at 20 °CR
DC1-5 1.85 Ω±20 %
DC-resistanceN6 at 20 °CR
DC6 135 mΩ±20 %
DC-resistance N7 at 20 °CR
DC7 140 mΩ±20 %
Saturation current N1-N5 dL/L = 20 %ISAT 1.0 A typical
Leakage inductance N1-N5 200 kHz/0.1 V rest shorted LS275 μHtypical
Coupling capacitance 20 kHz/1 V all windings CWW 30.0 pF typical
Hipot test 3 mA, 1 s all windings HV 3.0 kV

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6.2.2 Dimensions
•Core: E30/15/7
•Core material: Ferrite
•Air gap in center leg: 1100 μm
•Bobbin: CSH-E30/7-1S-10P
Fig 13. Transformer T3
019aaa29
9
31.5 mm
(max)
31.5 mm
(max)
21 mm
(max)
10
6
1
5

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7. Application example
7.1 Default application T5 HE 35 W
The default settings of the board are for a T5 HE 35 W burner.
Table 15. Default settings
Jumper Position Comment
X32 short half-bridge sense resistor 1 Ω(used for PCS)
X34 open -
X33 1-2 open, 2-3 short use lamp current sensing
X114 short connect transformer T1
X115 short -
X39 1-2 shorted, 2-3 open connect lamp to lamp current sense circuit
X110, X111, X112, X113 short connect to lamp 4
X117 open do not connect transformer T3
Table 16. External connections for T5 HE 35W
Jumper Position Comment
X1 VDC 400 V DC
X68 External dimming the UBA2021 board has no dimming so this input can be left open.
X8 burner T5 HE 35 W burner

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8. Bill of Materials (BOM)
Table 17. BOM daughter board
Reference Value or type no. Component
A1 UBA2021P NXP Semiconductors UBA2021P IC
C1, C4 100 nF/50 V Capacitor ceramic X7R, 50 V, 10 %
C2 330 nF/16 V Capacitor ceramic X7R, 16 V, 10 %
C3 100 pF/100 V Capacitor ceramic C0G, 50 V, 1 %
C5 n.m. -
C6 470 pF/500 V Capacitor ceramic 500 V NP0 5 %
C7 1 μF/25 V Capacitor ceramic X7R 25 V, 10 %
C8 1 nF/100 V Capacitor ceramic X7R 100 V, 10 %
C9 10 n Capacitor ceramic X7R, 50 V, 10 %
C10 2.2 n / 100 V Capacitor ceramic X7R 100 V, 10 %
R1, R2 150 kΩResistor 1 %0.125 W 100 ppm RC12H
R3 30 kΩResistor 1 %0.125 W 100 ppm RC12H
R4 47 ΩResistor 1 %0.125 W 0 to +500 ppm RC12H
R5 10 kΩResistor 1 %0.125 W 100 ppm RC12H
R6 1 kΩResistor 1 %0.125 W 100 ppm RC12H
R7 3.3 kΩResistor 1 %0.125 W 100 ppm RC12H
R8 160 kΩResistor 1 %0.125 W 100 ppm RC12H
V1, V2, V3 BAS29 NXP Semiconductors, Diode, 50 ns 90 V 250 mA
V4 BC857C NXP Semiconductors, PNP transistor
V5 BC847C NXP Semiconductors, NPN transistor

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UBA2021 evaluation board
Table 18. BOM main board
Reference Value or type no. Component
C1 68 nF/400 V Capacitor MKT 400 V DC 10 %
C2, C3 47 nF/305 V AC Capacitor, MKP Class X2 20 %
C4, C5 33 nF/100 V Capacitor MKT 100 V DC 5 %
C6 4.7 nF/2000 V Capacitor MKP radial potted, 5 %
C11, C14 10 nF/100 V Capacitor ceramic disc X7R, 10 %
C12 1 nF/100 V Capacitor ceramic disc X7R, 10 %
C15, C16 47 μF/350 V Capacitor elco rad 350 V 105 °C 20 %
C17 680 nF/50 V Capacitor ceramic disc X7R, 10 %
C18 2.2 nF/100 V Capacitor ceramic disc X7R, 10 %
C19 470 n/63 V Capacitor MKT 63 V DC 5 %
F1 Fuse holder 5 x 20 Fuse holder for 5 mm x 20 mm fuses
F2 2 A Fuse 5 mm x 20 mm time lag
L1 1.5 mH Inductor Choke Ir = 850 mA, R= 580 mΩ
R1, R3 33 ΩResistor 1 %0.6 W 50 ppm MRS25
R2, R4 0 ΩZero Ohm Link Im= 25 A at 25 °C
R5 8.2 KΩResistor 1 %0.6 W 50 ppm MRS25
R6, R8, R9 1 Ω2 W Resistor Power 5 %2 W 100 ppm/°C MFP
R7 1 KΩResistor 1 %0.6 W 50 ppm MRS25
R10 33 Ω2 W Resistor Power 5 %2 W 450 ppm/°C Carbon Film
R18 33 kΩResistor 1 %0.6 W 50 ppm MRS25
R19 11 kΩResistor 1 %0.6 W 50 ppm MRS25
R20 220 kΩResistor 1 %0.6 W 50 ppm MRS25
R22, R23 43 kΩResistor 1 %0.6 W 50 ppm MRS25
R24, R25 47 kΩResistor 1 %0.6 W 50 ppm MRS25
R27, R29, R33, R34 75 kΩResistor 1 %0.6 W 50 ppm MRS25
R31 1.0 kΩResistor 1%0.6 W 50 ppm MRS25
R32 100 kΩResistor 1%0.6 W 50 ppm MRS25
R35, R36 56 kΩResistor 1%0.6 W 50 ppm MRS25
R37 0 ΩZero Ohm Link Im= 25 A at 25 °C
R38 5.6 kΩResistor 1 %0.6 W 50 ppm MRS25
R39 1.2 kΩResistor 1 %0.6 W 50 ppm MRS25
R40 75 kΩResistor 1 %0.6 W 50 ppm MRS25
T1 760870401 Würth Elektronik Part number: 760870401
T3 760870402 Würth Elektronik Part number: 760870402
V1, V11, V12, V16 1N4937 Diode, fast recovery, 600 V, 1 A
V2 GBU8K BRIDGE 800 V, 8 A TH
V3, V6 2SK3569 MOSFET N-ch 600 V 10 A 0.54 Ω
V15 n.m. -
X1, X3, X68 MKDS 2,5/2-5,08 Terminal block (screw) 2-pole, p = 2e, 2.5 mm2
X2, X14 Socket 3 Socket straight p = 2.54, h = 7 mm
X8, X21, X42, X56 MKDS 2,5/4-5,08 Terminal block (screw) 4-pole, p = 2e, 2.5 mm2

UM10412 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
User manual Rev. 1 — 2 November 2010 20 of 26
NXP Semiconductors UM10412
UBA2021 evaluation board
9. Layout
Top view Bottom view
Fig 14. Daughter PCB layout
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1
T
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0
R1A
Top view Bottom view
Fig 15. Daughter board silk screen
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2
R2
C8
R3
C11
3
1
V5R7
R5C10
R6
C9
X1
C2 C1 C3 R1
1
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6
R4
3
21
3
V2 2 V4 3
V3V1
3
1
C7 C6 C5
A1
C4