NXP UBA2015P User guide

Brand: NXP

Model: UBA2015P

Type: User guide

This manual is also suitable for

UM10438

UBA2015AP 120 V (AC) evaluation board

Rev. 2.1 — 9 March 2012 User manual

Document information

Info Content

Keywords UBA2015AP, evaluation board, dimming, boost

Abstract This document describes the performance, technical data and wiring of

the UBA2015AP 120 V (AC) evaluation board.

User manual Rev. 2.1 — 9 March 2012 2 of 38

Contact information

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: [email protected]

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

Revision history

Rev Date Description

v.2.1 20120309 fourth issue

v.2 20111117 third issue

v.1.1 20110912 second issue

v.1 20110826 first issue

User manual Rev. 2.1 — 9 March 2012 3 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

1. Introduction

This evaluation board is intended to build applications with the UBA2016A, UBA2015A

and UBA2015 ballast controller family. This document describes the specification and use

of the board. This ballast design is intended to drive one 35W T5 lamp with the

UBA2015AP. However, several options are provided on the board to use it with the

UBA2016AP and UBA2015P.

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.

Fig 1. Photograph of the UBA2015AP evaluation board

aaa-000409

User manual Rev. 2.1 — 9 March 2012 4 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

2. Safety warning

This evaluation board is connected to a high AC voltage (up to 200 V). Avoid touching the

reference board during operation. An isolated housing is mandatory when used in

uncontrolled, non-laboratory environments. Galvanic isolation of the mains phase using a

fixed or variable transformer (Variac) is always recommended. The symbols shown in

Figure 2

indicate these devices.

3. Specification

a. Isolated b. Not isolated

Fig 2. Variac isolation symbols

019aab173

019aab174

Table 1. Specifications for the evaluation board

Parameter Description

Ballast type electronic

Starting method programmed start with preheat

Lamp terminals 4

Line voltage 100 V to 140 V

Line frequency 50 Hz or 60 Hz

Number of lamps 1

Dimming interface 1 V to 10 V

Transient protection IEC61547

Table 2. Supported lamps

Lamp type Description

T5 35W 35 W T5 high-efficiency fluorescent lamp

Table 3. Ballast performance

Lamp type Lamps P

(W)

Maximum

THD

Maximum

lamp current

crest factor

Power

factor

Nominal

lamp current

(A)

Minimum

lamp current

(mA)

T5 35W 1 35 10 % 1.7 >0.95 0.170 5

User manual Rev. 2.1 — 9 March 2012 5 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

Remark: The chassis (if any) must connect to the earth which is available on mounting

hole E1.

Remark: Before powering up the board, check if the three MOSFETs are correctly

mounted. During transport, the MOSFETs can become detached.

Fig 3. Wiring diagram

green/yellow

EVALUATION BOARD

LAMP T5 35W

aaa-000350

blue

violet (+)

grey (-)

brown

blue

red

blue

User manual Rev. 2.1 — 9 March 2012 6 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

4. Performance data

4.1 Power factor, THD and input power

4.2 Dimming curve

(1) PF.

(2) Current THD.

(3) input power.

Fig 4. Power factor, THD and input power as function of the mains input voltage

aaa-000351

RMS mains voltage (V)

90 130 170 210 250 290

1.2

1.0

0.8

0.6

0.4

0.2

PF,

THD

44.4

(W)

0 42.0

42.4

42.8

43.2

43.6

44.0

(1)

(2)

(3)

(1) Measured with an AC coupled current probe

Fig 5. Normalized lamp discharge current as function of the DIM input voltage

100

dim input voltage (V)

0108462

aaa-000352

normalized lamp

discharge current (A)

User manual Rev. 2.1 — 9 March 2012 7 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

4.3 Sum of Squares (SoS) curve

(1) SoS (maximum).

(2) SoS target.

(3) SoS measured.

(4) SoS (minimum).

a. SoS results

(1) I

(maximum).

(2) I

measured.

(3) I

(maximum).

(4) I

measured.

b. Maximum lead current check

Fig 6. Sum of Squares and maximum lead current check

0.02

0.04

0.06

0.08

SoS

)

-0.02

lamp discharge current (A)

0 0.200.150.05 0.10

aaa-000353

(1)

(2)

(3)

(4)

0.10

0.20

0.30

current

(A)

lamp discharge current (A)

0 0.200.150.05 0.10

aaa-000354

(4)

(2)

(3)

(1)

User manual Rev. 2.1 — 9 March 2012 8 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

4.4 ElectroMagnetic Interference (EMI) emission tests

a. 115 V (AC) L

b. 115 V (AC) N

Fig 7. EMI – conducted emission test results

aaa-000355

aaa-000356

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NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

5. Board Information

The input section includes the fuse; surge protection against fast AC transients; EMI filter;

double side rectifier and pre-conditioner or power factor correct (PFC). The output of the

PFC connects to a buffer electrolytic capacitor to supply the half-bridge circuit. The lamp

connects to the half-bridge circuit. The UBA2015AP controller IC controls the PFC and the

half-bridge circuit. A low-voltage control input is present to control the dimming of the lamp

light output.

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 NMOST transistors. The

resonant circuit includes a transformer for electrode preheating and heating.

The type of ballast presented here is used for most ballast for lamp powers above 25 W. It

has proven to be a cost effective application.

Remark: Some of the components are overrated for this evaluation board. When

designing a final application, some component ratings can be lowered and some circuits

can be simplified or combined to reduce component count and costs.

5.1 Dimming without using an external voltage source

The ballast is dimmed with a voltage source of 1 V (DC) to 10 V (DC) connected to

connector X7.

It is also possible to dim with an external potentiometer of 470 k (for example, no

external voltage supply is available). The potentiometer must connect to pin 1 (black wire,

DIM) and pin 2 (red wire, DIM+) of connector X7.

5.2 Half-bridge operating principle

This topology supports dimming and preheat times below 1 s for T5 lamps. It uses an

additional transformer for preheating/heating the filaments.

Fig 8. Block diagram

aaa-000357

FUSE

EMI

FILTER

mains

voltage

input

1 V to 10 V

dim

input

SURGE

PROTECTION

RECTIFIER

RESONANT

CIRCUIT

lamp

PFC

BUFFER

CAPACITOR

HALF

BRIDGE

DIM

UBA2015A

CONTROLLER

User manual Rev. 2.1 — 9 March 2012 10 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

When the lamp is off, two resonant frequencies can be distinguished. A main resonant

frequency f

res

and a second frequency f

sec

. Approaching f

res

will ignite the lamp:

(1)

Preheating the electrodes near f

sec

increases the preheat current without increasing the

filament current during normal operation. In dimmable applications, this aids compliance

with the lamp sum of squares requirement.

(2)

Rx is used to limit the voltage across Cx and LxA when the lamp is removed during

preheat or ignition.

Fig 9. Half-bridge topology

aaa-000358

res

3.3 nF

150 nF

T5 35W

4.7 kΩ

33 nF

fil

LxA

127 µH

LxC

4.1 µH

LxB

4.1 µH

420 V

highside

lowside

res

3.5 mH

330 nF

res

2 L

res



-----------------------------------

res

46.8 kHz==

sec

2 LxA Cx

---------------------------------

sec

77.7 kHz==

User manual Rev. 2.1 — 9 March 2012 11 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

The UBA2015AP controller starts at 100 kHz and sweeps down until the preheat

frequency is reached. The resistor on pin PH/EN sets the preheat frequency. During

preheat, the LC tank voltage remains below 200 V to prevent early ignition and glow.

(1) I

fil

(2) LC tank voltage.

Fig 10. Half-bridge frequency response with lamp not ignited

aaa-000359

f (kHz)

40 1008060

0.4

0.6

0.2

0.8

1.0

current

(A)

0.8

1.2

0.4

1.6

2.0

voltage

(kV)

(2)

(1)

User manual Rev. 2.1 — 9 March 2012 12 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

5.3 Schematic diagrams

Fig 11. Schematic diagram: Half-bridge circuit

J13-1

R33

R34

33 Ω

47 kΩ

J13-2

J13-3

BUS

RES

GHHB

SHHB

GDS=123

placed in header

2N60C

J14-1

R35

R36

33 Ω

R14

10 kΩ

R25

10 kΩ

J14-2

J14-3

J17

R12

1.33 Ω

R13

1 Ω

3.3 nF

R26

6.19 Ω

R27

23.7 Ω

R32

20 Ω

330 nF

R11

205 kΩ

R20

220 kΩ

D11

1N4937

D12

1N4937

R21

27 kΩ

C13

470 nF

C15

100 nF

R28

1 Ω

1N4937

R19

1 kΩ

1N4937

R10

5.1 kΩ

C11

100 pF

C10

33 nF

R15

10 MΩ

R18

1 Ω

J10

open

J15

close 1-2

GLHB

SLHB

IFB

BUS

213

GND

GDS=123

placed in header

2N60C

3.5 mH/1.4 A

750312352

R24

237 kΩ

R29

75 kΩ

R22

237 kΩ

R37

150 kΩ

33 nF

4.7 kΩ

VFB

150 nF

J16

close 1-2

J12

close 1-2

J18

D13

1N4937

1.9 V

CDC

EOL

GND

aaa-000360

IFB

TP6

249 kΩ

X11

X1-1

X13

X1-2

X15

X1-3

X17

X1-4

249 kΩ

330 nF

T1A, 127 μH, 1.8 A

760800001

T1C

4.1 μH

T1B

4.1 μH

330 nF

11 kΩ

HVPROBE

GND

T5 35W

TP7

RELAMP

TP10

TP12

TP15

23.7 kΩ

R31

100 Ω

User manual Rev. 2.1 — 9 March 2012 13 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

Fig 12. Schematic diagram: PFC circuit

aaa-000361

X12

Chassis

X14

Mains_N

X16

Mains_L

T1A

C14

220 nF

2.2 nF

165 kΩ

1N5062

UF4006

165 kΩ

2 x 15 mH

1.1 mH/2.7 A/Np:Ns = 57

750312407

710 V

220 nF

1N5062

470 nF

GND

1N5062

R39

4.7 Ω

R23

1 Ω

R44

3.48 kΩ

J19

J20

open

J21

open

R46

2.4 kΩ

R45

2.5 kΩ

TLVH431

U1 TLVH431

GND

R43

47 kΩ

R30

10 Ω

R16

562 kΩ

R17

562 kΩ

R42

562 kΩ

R41

562 kΩ

R40

100 kΩ

R38

187 kΩ

C16

47 µF

350 V

C12

10 nF

C17

47 µF

350 V

J11

J6-1

J6-2

J6-3

D10

1N4937

BRIDGE

BUS

AUX

1V9

GDS = 123

placed in header

6N60C

GPFC

FBPFC

User manual Rev. 2.1 — 9 March 2012 14 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

Fig 13. Schematic diagram: controller circuit

aaa-000362

CPT

J28

J30

open

J31

open

J32

J33

open

R69

41.2 kΩ

C40

10 nF

C39

22 nF

C38

47 nF

C37

100 nF

C41

47 nF

BUS

PREHEAT

J23

J25

J24

open

J26

open

C35

10 pF

C34

22 pF

C42

100 nF

D24

BZX79-C3V3

C43

22 µF

16 V

R55

2.2 MΩ

R59

2.2 MΩ

R75

47 kΩ

R72

470 kΩ

D25

1N4937

C44

100 µF

50 V

C33

47 pF

C32

100 pF

C29

100 pF

GND

GND GND

GND

DIM

BOOST

R67

R71

47 kΩ

D23

J27

open

J36

close 1-2

123

1N4937

10 kΩ

R68

1 kΩ

R70

33 kΩ

SW1

disable

R74

500 kΩ

R73

53.6 kΩ

J35

close 1-2

321

J29

open

C26

100 nF

D16

1N4744A

C23

470 nF

BC557B

D19

1N5224B

UBA2015AP

PH/EN

DIM

BOOST

J34

close 1-2

PREHEAT

CPT

DIM

CPT

CIFB

IREF

VFB

EOL

R60

33 kΩ

R61

33 kΩ

C24

10 nF

C25

470 nF

GND

IFB

SLHB

VFB

EOL

IFB

SLHB

FBPFC

COMPPFC

AUXPFC

GPFC

GND

GLHB

SHHB

FSHB

GHHB

AUXPFC

IREF

FSHB

C21

100 nF

C22

1 nF

500 V

SHHB

C28

68 nF

R51

10 MΩ

C27

100 nF

R62

1 kΩ

R64

390 kΩ

AUX

R58

D18

1N4937

100 Ω

C36

22 nF

D14

1N4744A

GND

R65

Reserved

R66

100 Ω

D22

1N4937

R47

750 kΩ

RELAMP

switch off when lamp is removed

switch on when lamp is inserted

User manual Rev. 2.1 — 9 March 2012 15 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

Fig 14. Schematic diagram: dim input circuit

X12

DIM+

X19

DIM-

GND

TP32

SHHB

DIM

D15

BZX79-C3V3

R52

5.6 kΩ

J22

close 1-2

123

2N3819

BC547C

R54

1 MΩ

R56

4.99 kΩ

R49

4.99 kΩ

C18

22 pF

500 V

C19

100 nF

R50

1 kΩ

R57

1 kΩ

D17

1N4937

D20

1N4937

D21

BZX79-C12

RT1

150 Ω

T4, 2 x 10 mH

750311081

BC547C

R53

261 kΩ

C20

10 nF

C30

100 nF

C31

100 nF

R63

4.7 kΩ

R48

3.3 kΩ

aaa-000363

xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x

xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx

User manual Rev. 2.1 — 9 March 2012 16 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

Fig 15. Schematic diagram: test points

TP37

SLHB

TP39

IFB

TP44

EOL

TP46

VFB

TP51

IREF

SHHB

TP20

TP24

TP29

TP33

TP28

TP21

TP25

TP30

TP34

TP36

TP56

CIFB

TP58

TP64

CPT

TP69

DIM

TP10_1

PREHEAT

TP10_2

BOOST

TP38

GHHB

TP40

FSHB

TP45

SHHB

TP47

GLHB

TP52

TP59

GPFC

TP65

AUXPFC

TP68

COMPPFC

TP70

FBPFC

TP3 TP86

TP9

BUS

TP1

BRIDGE

TP8

Chassis

TP14

Mains_L

TP11

Mains_N

TP13

CDC

TP23

RELAMP

TP16

RES

TP63

DIM+

TP67

DIM-

GND

TP41

TP48

TP53

TP60

TP42

TP49

TP54

TP61

TP66

GND

GND GND GND

TP71

TP74

TP77

TP80

TP72

TP75

TP78

TP81

TP22

TP26

TP31

TP35

TP43

TP50

TP55

TP62

TP73

TP76

TP79

TP82

TP87

GND

EXPERIMENTING

AREA

EXPERIMENTING

AREA

EXPERIMENTING

AREA

TEST CONNECTIONS FOR PROBES

GROUND CONNECTIONS FOR PROBES

MOUNTING HOLES

TP85 TP84 TP83 TP89 TP88 TP19 TP4 TP18 TP2 TP5 TP27 TP17

Chassis

spacer

M3X10-VZK

TP57

jumper link

GND GND

jumper link

X10

spacer

M3X10-VZK

spacer

M3X10-VZK

spacer

M3X10-VZK

spacer

M3X10-VZK

aaa-000364

User manual Rev. 2.1 — 9 March 2012 17 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

5.4 Functional description

The mains voltage is applied to the board and current flows through R6 and R9 to the

supply of the controller (VDD pin). When the current through R6 and R9 is higher than

240 A (I

stb(VDD)

), the controller the VDD voltage rises. When the VDD voltage is above

4.2 V (V

rst(VDD)

), the half-bridge circuit low-side MOSFET switches on and the floating

supply capacitor C1 is pre-charged.

The controller starts oscillating when the VDD voltage is above the 12.4 V (V

startup(VDD)

The PFC gate driver starts and the HB gate drivers start oscillating at 100 kHz (f

sw(high)

The dV/dt supply with capacitor C22 takes over the VDD supply to supply the IC with

enough energy for the gate drivers. The preheat timer starts and the controller sweeps the

frequency down from 100 kHz to the preheat frequency set by the PH/EN pin. The

oscillator remains at the preheat frequency until the preheat timer has ended.

When the preheat ends, the controller sweeps down to the half-bridge switching

frequency. The lamp ignites when the LC tank voltage reaches the lamp ignition voltage.

The ignition frequency is typically 50 kHz. The lamp current increases and the LC tank

voltage decreases. The controller senses the lamp current and LC tank voltage. When the

lamp current is high enough and the LC tank voltage is low enough for 3 ms

IFB

th(lod)IFB

and V

VFB

th(lod)VFB

for t

d(lod)

), the controller assumes that the lamp is

on. The controller enters burn state.

In burn state, all the protection features are activated. The controller closes the lamp

current control loop and the oscillator regulates the half-bridge switching frequency. The

half-bridge frequency is regulated and reaches its set point when the average absolute

IFB pin voltage equals the DIM pin voltage.

5.4.1 Start-up current, relamp and antistriation

The VDD supply of the IC is charged with a start-up current derived from the rectified

mains voltage. Resistor R2 provides the current path and determines the start-up voltage

level.

When the lamp is removed while the IC is set to deep dimming, a protection is triggered

and the controller is shut down. In this board, transistor Q7 pulls down the VDD voltage.

The signal RELAMP indicates the filament of the lamp and controls transistor Q7. The

pull-down by Q7 is released when the lamp is inserted.

UBA2015P and UBA2015AP can also be disabled by pulling down the voltage on the

PH/EN pin.

The RELAMP signal is generated with a DC current injection on the DC blocking capacitor

C8. This DC current also takes care of the antistriation function.

5.5 Evaluation board features

This board is equipped with evaluation functionality. This section described the additional

functionality and how to use the jumpers.

5.5.1 Default jumper settings

Table 4 shows the default (factory) configuration jumper settings with the UBA2015AP

mounted.

User manual Rev. 2.1 — 9 March 2012 18 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

5.5.2 Supporting other IC versions

The board supports all DIP versions of the ballast controller family. Make sure that the

BUS capacitor is discharged when replacing ICs.

Table 4. Default jumper setting

Jumper Function Type UBA2015AP

J1 Lamp connection 2-pin closed

J2 Lamp connection 2-pin closed

J3 Lamp connection 2-pin closed

J4 Lamp connection 2-pin closed

J5 HB inductor 2-pin closed

J6 PFC MOSFET socket socket 6N60C

J7 HB inductor 2-pin closed

J8 EOL circuit 2-pin closed

J9 HB current sense 2-pin closed

J10 HB current sense 2-pin open

J11 PFC over current sense 2-pin closed

J12 EOL disable 3-pin closed 1-2

J13 HB MOSFET socket high-side socket 2N60C

J14 HB MOSFET socket low-side socket 2N60C

J15 IFB input select 3-pin closed 1-2

J16 Lamp current sense circuit select 3-pin closed 1-2

J17 HB current sense 2-pin closed

J18 EOL circuit 2-pin closed

J19 Bus voltage setting 2-pin closed

J20 FBPFC fixed voltage 2-pin open

J21 Bus voltage adjustable 2-pin open

J22 DIM input setting 3-pin closed 1-2

J23 CF capacitor bank 100 pF 2-pin closed

J24 CF capacitor bank 47 pF 2-pin open

J25 CF capacitor bank 22 pF 2-pin closed

J26 CF capacitor bank 10 pF 2-pin open

J27 Start-up dim level 2-pin open

J28 CPT test 2-pin closed

J29 PFC disable 2-pin open

J30 CPT capacitor bank 100 nF 2-pin open

J31 CPT capacitor bank 47 nF 2-pin open

J32 CPT capacitor bank 22 nF 2-pin closed

J33 CPT capacitor bank 10 nF 2-pin open

J34 Boost/ fixed freq preheat select 3-pin closed 1-2

J35 Preheat frequency setting 3-pin closed 1-2

J36 Boost select 3-pin closed 1-2

User manual Rev. 2.1 — 9 March 2012 19 of 38

NXP Semiconductors

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UBA2015AP 120 V (AC) evaluation board

5.5.2.1 UBA2015P

The UBA2015P IC is a non-dimmable version with fixed frequency preheat option. The

UBA2015P does not support boost.

The default jumper settings are suited. The DIM input pin of the UBA2015P is internally

not connected.

5.5.2.2 UBA2016AP

The UBA2016AP IC is a dimmable version with no fixed frequency preheat option. The

UBA2015AP supports boost.

5.5.3 Evaluation features and alternative jumper settings

5.5.3.1 PFC overcurrent adjustment

[1] Default setting.

5.5.3.2 External supply for the half-bridge circuit with PFC disabled

Experimenting with an external voltage (laboratory supply or separate PFC controller) for

the BUS is possible. Fix the PFC feedback signal FBPFC and the COMPFC to 1.24 V.

The default bus voltage is 420 V (DC). When adjusting the bus voltage it is advised to

disable the EOL protection with jumper J12.

The external laboratory supply must connect to the BRIDGE (TP1) because the start-up

current supplies the VDD pin.

5.5.3.3 Bus voltage adjustment with PFC enabled

The default bus voltage is 420 V (DC). With the alternative jumper settings shown in this

paragraph, it is possible to adjust the bus voltage. When adjusting the bus voltage, it is

advised the EOL protection is disabled using jumper J12.

Table 5. UBA2016AP jumper setting

Jumper Function Type UBA2016AP

J9 HB current sense 2-pin open

J34 Boost/fixed freq preheat select 3-pin closed 2-3

Table 6. Jumper settings: PFC overcurrent sense resistor

Jumper Function Setting R

SENSE

J11 PFC over current sense closed 0.82 

[1]

J11 open 1 

Table 7. Jumper settings: PFC disable for external half-bridge supply

Jumper Function Setting

J6 PFC MOSFET socket remove MOSFET

J19 Bus voltage setting open

J20 FBPFC fixed voltage 1.24 V closed

J21 Bus voltage adjustable open

J29 PFC disable closed

User manual Rev. 2.1 — 9 March 2012 20 of 38

NXP Semiconductors

UM10438

UBA2015AP 120 V (AC) evaluation board

The bus voltage V

bus

is adjustable with resistor R45:

• R45 turned clockwise: V

bus

= 300 V (DC)

• R45 turned counter clockwise: V

bus

= 600 V (DC)

5.5.3.4 Half-bridge frequency control loop options

The default setting is lamp current control. The controller can regulate any other signal

such as the HB current. The controller increases the half-bridge switching frequency when

the feedback signal is too high. The controller decreases the half-bridge switching

frequency when the feedback signal is too low.

[1] Default setting.

HB current sense (J15 closed 2-3): Some LC tank topologies allow dimming to 10 % via

the HB current sense. The HB current is fed back to the IFB pin and the controller

regulates the HB current.

Remark: The LC tank topology on this board is not suited for dimming via the HB current

sense. A dedicated LC circuit could be placed in the experiment area, see

NXP Semiconductors AN10872 for suitable series resonant type of circuits.

Disabled (J15 open): The IFB pin is internally pulled down to ground level when the IFB

pin is left open. The controller then operates at the minimum operating frequency set by

the CF capacitor. The default minimum operating frequency is default 43 kHz.

Remark: It is recommended to connect the IFB pin to ground instead of leaving J15 open

to avoid interference on the PCB track.

5.5.3.5 Lamp current sense

There are two lamp current sense circuits on the evaluation board; by default the

non-linear sense circuit is selected.

The IC contains a double-sided rectifier. This setup means that no rectification is required

in the sense circuit.

Table 8. Jumper settings: PFC output voltage (VBUS) adjustment

Jumper Function Setting

J19 Bus voltage setting open

J20 FBPFC fixed voltage open

J21 Bus voltage adjustable closed

Table 9. Half-bridge frequency control loop jumper setting

Jumper Function Setting IFB input

J15 IFB input select closed 1-2

[1]

Lamp current

J15 closed 2-3 HB current

J15 open Disabled

Table 10. Half-bridge frequency control loop jumper setting

Jumper Function Setting Remarks

J16 Lamp current sense circuit select closed 1-2

[1]

non-linear

J16 closed 2-3 adjustable resistor

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NXP UBA2015P User guide

Brand: NXP

Model: UBA2015P

Type: User guide

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