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UM10406

SSL1523 high power factor 5 W LED driver for universal

mains

Rev. 01 — 3 August 2010

User manual

Document information

Info

Content

Keywords

Abstract

SSL1523, SSL152x family, LED driver, mains supply, AC/DC conversion

This user manual describes a demonstration (demo) board for a mains

operated non-dimmable 5 W LED driver using the SSL1523 SMPS

controller IC.

UM10406

NXP Semiconductors

SSL1523 5 W LED driver

Revision history

Rev

Date

Description

01

20100803

Draft version

Contact information

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

For sales office addresses, please send an email to: salesaddresses@nxp.com

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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 that is 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.

1.1 General description

The SSL1523 5 W LED driver is a high performance solution for a professional non-dim-

mable application with multiple high power LEDs, that requires galvanic isolation and a

safe output voltage. It can generate a regulated output current with an output power of up

to 5 W, which is equal to a 25 W incandescent lamp (at 63 Lumen/W). Examples are shelf

lighting, down lighting, LED lighting for bathrooms etc. This device can also be used with

less external components in an application, if some performance compromises can be

accepted. Details of a solution with less external components are given in the application

note AN10925.

2. Specification

Table 1 shows the specification for the SSL1523 5 W LED driver.

Specification

Table 1.

Parameter

Specification

Comment

AC line input voltage

100 V (AC) to 254 V (AC)

board has been optimized for 230 V (AC) or

120 V (AC) ± 10 % variation

Output voltage (LED voltage)

19 V (nominal): 12 V to 25 V

range

-

Output voltage protection

33 V (DC)

-

Output current (LED current)

200 mA up to 250 mA

adjustable with potentiometer

Input voltage/load current dependency ± 1 % in the range 100 V (AC) to the maximum output power is not exceeded

130 V (AC) ± 1 % in the range

210 V (AC) to 254 V (AC)

Output voltage/load current dependency ± 4 %/Volt in regulated range

the maximum output power is not exceeded;

see graphs Figure 9 and Figure 10.

Current ripple

± 75 mA ± 30 %

5 W

at 250 mA

Maximum output power (LED power)

Efficiency

at V_out= +19 V

>80 %

at T_amb= 25 °C, V_out= +19 V; see graphs

Figure 11 and Figure 12.

Power Factor:

120 V (AC)

0.98

at 5 W output power; 19 V, V_out= +19 V

-

230 V (AC)

0.90

Switching frequency

90 kHz to 110 kHz

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Table 1.

Specification …continued

Parameter

Specification

50 mm × 86 mm × 1.6 mm

0 °C to 85 °C

Comment

Board dimensions

Operating temperature

Isolation voltage

-

± 4 kV

between the primary and secondary circuits

3. Demo board views

019aaa132

Fig 1. Demo board top

019aaa133

Fig 2. Demo board bottom

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4. Demo board connections

The demo board can be operated from mains voltages of 120 V (AC) (60 Hz) up to

230 V (AC) (50 Hz). The board is designed to work with multiple high power LEDs with a

total working voltage of 12 V to 25 V. The output current can be set by resistor R18, see

Section 7. A dedicated LED load connected to K3 can be supplied on request. The

connector K2 can be used to attach other LED loads. The output voltage is limited to a

maximum of 33 V. When attaching a LED load to an operational board (hot plugging), an

inrush peak current will occur due to discharge of capacitor C10. After (some)

discharge(s), the LEDs may deteriorate and/or become damaged.

control input from

external opto coupler

pin 2: − pin 1: +

pin 2: LED −

pin 1: L

pin 2:

K4

K1

pin 1: LED +

pin 3: N

K2

K3

J1

J2

pin 6: LED −

pin 5: LED −

pin 4: LED −

pin 3: LED +

pin 2: LED +

pin 1: LED +

019aaa134

Fig 3. Demo board connection diagram

4.1 Connecting the demo board:

• If a galvanic isolated transformer is used, this should be placed between the AC

source and the demo board.

• Connect a user-defined LED (string) to the connector K2 as shown in Figure 3. Make

sure that the anode of the LED (string) is connected to + (bottom side of this

connector).

5. Functional description

The SSL1523 IC (Ref. 3) has several internal functions which include the following:

• The SSL1523 controls and drives the flyback converter.

• Over Current Protection (OCP) of the internal FET at 0.5 V on the SOURCE pin.

• The converter frequency is set with an internal oscillator, the timing of which is

controlled by external RC components on pin RC.

• The REG pin controls the on-time of the internal switch between 0 % and 75 %.

This board is optimized to operate at a power factor of 0.9 in the nominal application with

six LEDs on the output. In order to achieve this, the converter operates dominantly at a

constant t_onmode. The output power of the converter is buffered by capacitor C10, and

therefore the circuit exhibits resistive input current behavior (see Figure 4).

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The input circuit of the converter must be equipped with a filter that is partially capacitive,

in order to address the EMC requirements (see Figure 5). The combination of C1, L1 and

C2 make a filter that blocks most of the disturbance generated by the converter input

current. This filter is designed to have a limited capacitive load, so a good power factor

can be achieved. For this design, two 150 nF capacitors are incorporated, resulting in a

power factor of at least 0.9 for the nominal condition with six LEDs connected at 5 W

output power.

019aaa135

Fig 4. Mains current (C2), V_CC(C1), bulk capacitor input voltage (C3) and the mains voltage (C4)

The board is equipped with a feedback loop to regulate the output current. This feedback

loop senses the LED current over sense resistor R10, and a current mirror is made from

transistors Q10a/Q10b. Using R18, the current level can then be set. The same feedback

loop is also used to provide overvoltage protection. If the LED voltage exceeds 33 V, a

current through R17 and D11, D12 and D13 will start running. The current through the

opto coupler IC2 will pull up the REG pin. At values above 2.7 V, the ‘on time’ of the

internal MOSFET is zero. The feedback loop has a proportional, and partially integrated

action. The gain is critical due to the phase shift caused by the converter and the output

capacitor C10. Increased gain will make the feedback loop intrinsically unstable.

The accuracy of the resulting output current will satisfy the requirements of the majority of

the 5 W LED applications with four to eight LEDs connected in series. The demo board

can be controlled by connecting the floating output of an external opto coupler (TCDT1124

or equivalent) to K4.

The demo board can be switched on and off by switching the external opto coupler.

Controlling the LED current is another option. The LED current can be regulated by

applying a PWM signal to the external input with a frequency up to 1 kHz. The PWM

frequency can be synchronized with the ripple frequency on the buffer capacitor C1 for an

optimal mains input current shape.

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6. Board system optimization

To meet specific customer application requirements, the modifications described in the

following sections are possible.

6.1 Changing the output current and LED current

One of the major advantages of a flyback converter over other topologies, is its suitability

for driving LED configurations with a broad range of voltages. Essentially, changing the

winding ratio whilst maintaining the value of the primary inductance, will shift the output

working voltage accordingly. Part of the efficiency of the driver is linked to the output

voltage. A lower output voltage will require increased transformation ratio, and will cause

higher secondary losses. In practice, a mains operated flyback converter will have an

efficiency > 80 % for high output voltages (like 40 V) down to 50 % for very low output

voltages < 3 V. At low voltages, synchronous rectification becomes advisable to reduce

rectification losses.

The NXP TEA 1761/TEA1762 can be used for this purpose, see Ref. 1. For exact

calculations of transformer properties and peak current, refer to Ref. 2 application note

AN10754, “How to design an LED driver using the SSL2101”, see Ref. 2.

6.2 Changing the output ripple current

The output ripple current is mostly determined by the LED voltage, the LED dynamic

resistance and the output capacitor. The present value of C10 has been chosen to

optimize the capacitor size under typical load. The resulting ripple of ± 30 % will result in

an expected deterioration of light output < 1 %.

The size for the buffer capacitor (C10) can be estimated from Equation 1:

I

1

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

C₁₀

=

⋅

(1)

ΔI 2πf_net⋅ R_dynamic

Using a series of LEDs, the dynamic resistance of each LED can be multiplied by the

number of LEDs. The current sense resistor (R10) should also be included in this

calculation.

Example: For a ripple current of ± 30 %, and a mains frequency of 50 Hz, and a total

dynamic resistance of 7 Ω, the resulting capacitance value will be 3.3333 / (314*7) =

1500 μF. The capacitor must be specified for the HF switching related ripple current of

about 0.35 times the average effective LED current (I_LED(AV)). For high lifetime

applications, the ripple current specification of the electrolytic capacitor must be

increased. For details, please contact the capacitor supplier.

6.3 Changing the load curve

The current load curve can be divided into the following two regions:

• Where the current control loop regulates the output current, the constant current

output

• Where the IC limits the peak input current of the converter, the constant power output

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The constant power output occurs at output voltages above 23 V combined with an output

power exceeding 5 W, see also Section 9, Figure 9. In this area, constant output power

becomes the dominant control mechanism. At very low output voltages, the feedback loop

will become non-functional, resulting again in constant output power mode. An output

short-circuit will cause an output current of about 1 A, resulting in increased stress on the

transformer TX1, shunt resistor R10, the output diode D10, and the snubber diode D3.

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7.1 Bill of materials (BOM)

Table 2.

Bill of materials

Part Description

no.

Value

PCB footprint

Supplier Art no.

Manufacturer Manufacturer part no.

C1

C2

C3

capacitor

150 nF 400 V

1 μF 35 V

-

Farnell

-

9752838

1611920

-

B32562J6154K

GMK107BJ105KA-T

-

0603

C11 capacitor

1 μF 35 V

C4

capacitor CPO 330 pF 5 %

NGO

C10 capacitor low

ESR

1500 μF 35 V

pitch = 5 mm

Farnell

-

1219477

1611920

1572632

3531971

Panasonic

-

EEUFM1V152L

C12 capacitor low

ESR

1 μF 35 V

0603

0805

-

GMK107BJ105KA-T

C0805C106K8PAC-TU

DE1E3KX102MA5B

C13 capacitor

6.8 μF 10 V

Kemet

Murata

C15 Y-CAP

Y-CAP 1 nF

250 V (AC)

D1

D2

diode bridge

TVS

MB6S

-

1621770

1578842

Multicomp

-

P6KE400A

DO15

Farnell

D3

D4

TVS

P6KE200A

HER107

DO15

DO41

Farnell

1017750

9565191

Multicomp

-

diode fast

D5

D6

diode fast

HER107

DO41

Farnell

-

Zener diode

BZV55-C30

SOD80C

DO41

1081362RL NXP

D10 diode Schottky SB1H100

9550364

Vishay

D11 Zener diode

D12 diode standard 1n4148

D13 Zener diode

BZV55-C22

SOD80C

SMD

Farnell

1097189

1469425

1757832

1637535

-

NXP

Vishay

NXP

Schurter

NXP

-

BZX384-B6V2 SOD-323

BZX384-B6V2

34.6915

SSL1523

-

F1

fuse

1 A 250 V

SSL1523

TCDT1124

pitch = 5.08 mm Farnell

IC1

IC2

SSL1523

-

opto coupler

CTR 160 320 %

isolation =

Farnell

1045415

class II

K1

K2

K3

K4

L1

connector

coil

-

pitch = 5.08 mm Farnell

pitch = 2.54 mm Farnell

pitch = 5.08 mm Farnell

1131853

1668357

1131853

1710434

Weidmuller

Samtec

PM5.08/2/90

SSW-106-02-G-S-RA

PM5.08/2/90

-

Weidmuller

1 mH -

13R105C

pitch = 2 E

Farnell

13R105C

Murata

L10

coil

10 μH 2.6 A

pitch = 5 mm

-

Wuerth

744772100

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Table 2.

Bill of materials …continued

Q10 dual transistor BCM857DS

PNP

SC-74 (TSOP6) Farnell

SOT457

1757904

NXP

BCM857DS

Q11 transistor PNP BC857

SMD

-

R1

R2

R3

R4

R5

R6

R7

R8

resistor

33 Ω 2 W

100 Ω

Farnell

1565460

Welwyn

-

0603

0805

1206

-

6.8 kΩ

220 kΩ

20 kΩ

MC34751

-

47 kΩ

120 kΩ

2.4 Ω

resistor not

wirewound

R9

resistor not

wirewound

2.4 Ω

1206

-

R10 current sense

resistor not

1 Ω 1 W 1 %

Farnell

5383894

RCD

Components

F1S 1R

wirewound

R11 resistor

R12 resistor

R13 resistor

R17 resistor

R14 resistor

R15 resistor

R19 resistor

R20 resistor

R16 resistor

220 Ω 1 %

1 kΩ

0603

-

1 kΩ 1 %

10 kΩ 1 %

10 kΩ

-

10 kΩ

-

6.2 kΩ 1 %

-

R18 variable resistor 4.7 kΩ

potentiometer

leaded

Farnell

1227568

Tyco

CB10MV472ME

TX1 transformer 760871038

EE13

Wuerth

760871038 Wuerth

760871038

8. Transformer specification

Figure 6 shows the transformer schematic:

3

N1

2

7

6

N2

1

N3

4

019aaa137

Fig 6. Transformer schematic

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8.1 Winding specification

1 mm on pin 1 - 4 side

N1 (2-3):

N2 (7-6):

N1 (2-3):

N3 (1-4):

AWG39

AWG26 TIW

AWG39

AWG35

bobbin

019aaa138

tape

Fig 7. Winding specification

Table 3.

Winding

Winding specification

Section

N1 : N2

N1 : N3

Ratio

Primary to secondary

Primary to auxiliary

1 : 0.173

1 : 0.204

8.2 Electrical characteristics

Table 4.

Section

N1

Inductance

1.85 mH ± 5 %

56 μH

N2

N3

75 μH

• Nominal frequency = 100 kHz

• V_breakdownN1, N2 = 4 kV and N3, N2 = 4 kV

• Leakage inductance = 20 μH (short N2)

8.3 Core and bobbin

• Core: EE13/6/6 (3C90 or better)

• Air gap in centre leg

• Bobbin: for EE13/6/6 core; bobbin must be suitable for Class II isolation requirements.

8.4 Physical dimensions

15 mm

15.75 mm

18.5 mm

019aaa139

Fig 8. Transformer dimensions

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9. Appendix

9.1 Load curves

019aaa140

275

(1)

LED

current

(mA)

225

175

125

(2)

(3)

12

16

20

24

28

LED voltage (V)

(1) LED current = 250 mA.

(2) LED current = 200 mA.

(3) LED current = 150 mA.

Fig 9. 120 V (AC) load curve at V_LED= 19.5 V

019aaa141

275

(1)

LED

current

(mA)

225

(2)

175

(3)

125

12

16

20

24

28

LED voltage (V)

(1) LED current = 250 mA.

(2) LED current = 200 mA.

(3) LED current = 150 mA.

Fig 10. 230 V (AC) load curve at V_LED= 19.5 V

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9.2 Efficiency curves

019aaa142

0.84

η

(%)

0.80

0.76

0.72

(1)

(2)

(3)

12

16

20

24

28

LED voltage (V)

(1) LED current = 250 mA.

(2) LED current = 200 mA.

(3) LED current = 150 mA.

Fig 11. 120 V (AC) efficiency curve

019aaa143

0.84

η

(%)

0.80

0.76

0.72

(1)

(2)

(3)

12

16

20

24

28

LED voltage (V)

(1) LED current = 250 mA.

(2) LED current = 200 mA.

(3) LED current = 150 mA.

Fig 12. 230 V (AC) efficiency curve

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9.3 Input voltage dependency

019aaa144

254

lout

(mA)

252

(1)

250

248

246

70

110

150

190

230

270

Umains (V)

(1) LED current set at 250 mA nominal with a load of six LEDs in series (19.5 V).

Fig 13. Input voltage versus output current

9.4 EMC requirements

NXP Semiconductors

04.Dec 09 17:52

RBW

MT

9

1

kHz

ms

Marker

1

[T2

48.64 dB

]

V

Att 10 dB

100 kHz

PREAMP OFF

9.000000000 kHz

dB

1

V

100

90

1

MHz

10 MHz

SGL

PK

MAXH

80

70

60

2

AV

CLRWR

FCC15AVQ

FCC15BVQ

1

50

40

30

20

6DB

10

0

9

kHz

30 MHz

019aaa145

Fig 14. EMC measurements at a mains voltage of 120 V (AC)

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04.Dec 09 16:48

RBW

MT

9

1

kHz

ms

Marker

1

[T2

50.66 dB

]

V

Att 10 dB

100 kHz

PREAMP OFF

9.000000000 kHz

dB

1

V

100

EN55015Q

1

MHz

10 MHz

LIMIT CHECK

PASS

90

80

70

60

SGL

PK

MAXH

2

AV

CLRWR

1

EN55015A

50

40

3

6DB

20

10

0

9

kHz

30 MHz

019aaa146

Fig 15. EMC measurements at a mains voltage of 230 V (AC)

9.5 Mains conducted harmonics

Table 5.

Mains conducted harmonics

230 V (AC) @ 50 Hz amplitude

Harmonic

120 V (AC) @ 60 Hz amplitude

1

100

0

100

0

2

3

11.0

0

8.1

0

4

5

12.5

0

14

0

6

7

11.7

0

2.7

0

8

9

7.7

0

1.2

0

10

11

12

13

14

15

16

17

5.0

0

2.1

0

7.4

0

2.4

00

2.4

0

3.0

0

7.6

1.5

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Table 5.

Mains conducted harmonics …continued

Harmonic

230 V (AC) @ 50 Hz amplitude

120 V (AC) @ 60 Hz amplitude

18

19

20

0

1.1

0

3.4

0

Table 6.

Parameter

THD

Total Harmonic Distortion and Power Factor

230 V (AC) @ 50 Hz amplitude

27.1

120 V (AC) @ 50 Hz amplitude

21.6

0.98

Power Factor (PF)

0.90

10. References

[1] TEA1761/TEA1762 — NXP GreenChip controllers

for synchronous rectification.

[2] AN10754 — How to design an LED driver using the SSL2101 or SSL2102.

[3] SSL152x — Datasheet - SMPS ICs for mains LED drivers.

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11. Legal information

design. It is customer’s sole responsibility to determine whether the NXP

Semiconductors product is suitable and fit for the customer’s applications and

products planned, as well as for the planned application and use of

customer’s third party customer(s). Customers should provide appropriate

design and operating safeguards to minimize the risks associated with their

applications and products.

11.1 Definitions

Draft — The document is a draft version only. The content is still under

internal review and subject to formal approval, which may result in

modifications or additions. NXP Semiconductors does not give any

representations or warranties as to the accuracy or completeness of

information included herein and shall have no liability for the consequences of

use of such information.

NXP Semiconductors does not accept any liability related to any default,

damage, costs or problem which is based on any weakness or default in the

customer’s applications or products, or the application or use by customer’s

third party customer(s). Customer is responsible for doing all necessary

testing for the customer’s applications and products using NXP

Semiconductors products in order to avoid a default of the applications and

the products or of the application or use by customer’s third party

customer(s). NXP does not accept any liability in this respect.

11.2 Disclaimers

Limited warranty and liability — Information in this document is believed to

be accurate and reliable. However, NXP Semiconductors does not give any

representations or warranties, expressed or implied, as to the accuracy or

completeness of such information and shall have no liability for the

consequences of use of such information.

Export control — This document as well as the item(s) described herein

may be subject to export control regulations. Export might require a prior

authorization from national authorities.

In no event shall NXP Semiconductors be liable for any indirect, incidental,

punitive, special or consequential damages (including - without limitation - lost

profits, lost savings, business interruption, costs related to the removal or

replacement of any products or rework charges) whether or not such

damages are based on tort (including negligence), warranty, breach of

contract or any other legal theory.

Evaluation products — This product is provided on an “as is” and “with all

faults” basis for evaluation purposes only. NXP Semiconductors, its affiliates

and their suppliers expressly disclaim all warranties, whether express, implied

or statutory, including but not limited to the implied warranties of

non-infringement, merchantability and fitness for a particular purpose. The

entire risk as to the quality, or arising out of the use or performance, of this

product remains with customer.

Notwithstanding any damages that customer might incur for any reason

whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards

customer for the products described herein shall be limited in accordance

with the Terms and conditions of commercial sale of NXP Semiconductors.

In no event shall NXP Semiconductors, its affiliates or their suppliers be liable

to customer for any special, indirect, consequential, punitive or incidental

damages (including without limitation damages for loss of business, business

interruption, loss of use, loss of data or information, and the like) arising out

the use of or inability to use the product, whether or not based on tort

(including negligence), strict liability, breach of contract, breach of warranty or

any other theory, even if advised of the possibility of such damages.

Right to make changes — NXP Semiconductors reserves the right to make

changes to information published in this document, including without

limitation specifications and product descriptions, at any time and without

notice. This document supersedes and replaces all information supplied prior

to the publication hereof.

Notwithstanding any damages that customer might incur for any reason

whatsoever (including without limitation, all damages referenced above and

all direct or general damages), the entire liability of NXP Semiconductors, its

affiliates and their suppliers and customer’s exclusive remedy for all of the

foregoing shall be limited to actual damages incurred by customer based on

reasonable reliance up to the greater of the amount actually paid by customer

for the product or five dollars (US$5.00). The foregoing limitations, exclusions

and disclaimers shall apply to the maximum extent permitted by applicable

law, even if any remedy fails of its essential purpose.

Suitability for use — NXP Semiconductors products are not designed,

authorized or warranted to be suitable for use in life support, life-critical or

safety-critical systems or equipment, nor in applications where failure or

malfunction of an NXP Semiconductors product can reasonably be expected

to result in personal injury, death or severe property or environmental

damage. NXP Semiconductors accepts no liability for inclusion and/or use of

NXP Semiconductors products in such equipment or applications and

therefore such inclusion and/or use is at the customer’s own risk.

Applications — Applications that are described herein for any of these

products are for illustrative purposes only. NXP Semiconductors makes no

representation or warranty that such applications will be suitable for the

specified use without further testing or modification.

11.3 Trademarks

Notice: All referenced brands, product names, service names and trademarks

are the property of their respective owners.

Customers are responsible for the design and operation of their applications

and products using NXP Semiconductors products, and NXP Semiconductors

accepts no liability for any assistance with applications or customer product

UM10406

All information provided in this document is subject to legal disclaimers.

User manual

Rev. 01 — 3 August 2010

18 of 21

UM10406

NXP Semiconductors

SSL1523 5 W LED driver

12. Tables

Table 1. Specification . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Table 2. Bill of materials . . . . . . . . . . . . . . . . . . . . . . . .10

Table 3. Winding specification . . . . . . . . . . . . . . . . . . . .12

Table 4. Inductance . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Table 5. Mains conducted harmonics . . . . . . . . . . . . . .16

Table 6. Total Harmonic Distortion and Power Factor . .17

continued >>

UM10406

All information provided in this document is subject to legal disclaimers.

User manual

Rev. 01 — 3 August 2010

19 of 21

UM10406

NXP Semiconductors

SSL1523 5 W LED driver

13. Figures

Fig 1. Demo board top. . . . . . . . . . . . . . . . . . . . . . . . . . .4

Fig 2. Demo board bottom. . . . . . . . . . . . . . . . . . . . . . . .4

Fig 3. Demo board connection diagram. . . . . . . . . . . . . .5

Fig 4. Mains current (C2), V_CC(C1), bulk capacitor

input voltage (C3) and the mains voltage (C4) . . .6

Fig 5. Demo board schematic . . . . . . . . . . . . . . . . . . . . .9

Fig 6. Transformer schematic . . . . . . . . . . . . . . . . . . . .11

Fig 7. Winding specification. . . . . . . . . . . . . . . . . . . . . .12

Fig 8. Transformer dimensions . . . . . . . . . . . . . . . . . . .12

Fig 9. 120 V (AC) load curve at V_LED= 19.5 V . . . . . . .13

Fig 10. 230 V (AC) load curve at V_LED= 19.5 V . . . . . . .13

Fig 11. 120 V (AC) efficiency curve . . . . . . . . . . . . . . . . .14

Fig 12. 230 V (AC) efficiency curve . . . . . . . . . . . . . . . . .14

Fig 13. Input voltage versus output current . . . . . . . . . . .15

Fig 14. EMC measurements at a mains voltage

of 120 V (AC). . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Fig 15. EMC measurements at a mains voltage

of 230 V (AC). . . . . . . . . . . . . . . . . . . . . . . . . . . .16

continued >>

UM10406

All information provided in this document is subject to legal disclaimers.

User manual

Rev. 01 — 3 August 2010

20 of 21

UM10406

NXP Semiconductors

SSL1523 5 W LED driver

14. Contents

1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1

2

General description . . . . . . . . . . . . . . . . . . . . . 3

Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Demo board views. . . . . . . . . . . . . . . . . . . . . . . 4

Demo board connections . . . . . . . . . . . . . . . . . 5

Connecting the demo board: . . . . . . . . . . . . . . 5

Functional description . . . . . . . . . . . . . . . . . . . 5

3

4

4.1

5

6

Board system optimization. . . . . . . . . . . . . . . . 7

Changing the output current and LED current . 7

Changing the output ripple current . . . . . . . . . . 7

Changing the load curve. . . . . . . . . . . . . . . . . . 7

6.1

6.2

6.3

7

Board schematic . . . . . . . . . . . . . . . . . . . . . . . . 9

7.1

Bill of materials (BOM) . . . . . . . . . . . . . . . . . . 10

8

Transformer specification. . . . . . . . . . . . . . . . 11

Winding specification . . . . . . . . . . . . . . . . . . . 12

Electrical characteristics. . . . . . . . . . . . . . . . . 12

Core and bobbin. . . . . . . . . . . . . . . . . . . . . . . 12

Physical dimensions. . . . . . . . . . . . . . . . . . . . 12

8.1

8.2

8.3

8.4

9

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Load curves . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Efficiency curves. . . . . . . . . . . . . . . . . . . . . . . 14

Input voltage dependency. . . . . . . . . . . . . . . . 15

EMC requirements . . . . . . . . . . . . . . . . . . . . . 15

Mains conducted harmonics. . . . . . . . . . . . . . 16

9.1

9.2

9.3

9.4

9.5

10

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

11

Legal information. . . . . . . . . . . . . . . . . . . . . . . 18

Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 18

11.1

11.2

11.3

12

13

14

Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

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

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 3 August 2010

Document identifier: UM10406


型号：	UM10406
厂家：	NXP
描述：	SSL1523 high power factor 5 W LED driver for universal SSL1523高功率因数5 W LED驱动器通用驱动器
文件：	总21页 (文件大小：389K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UM10406 [NXP]

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