SSL2102T/DB/FLYB230V,598 - NXP Semiconductors

UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

Rev. 2 — 1 February 2011 User manual

Document information

Info Content

Keywords SSL21 02, LED drive r, AC/DC con version, dimmable, driver, mains supply,

user manual.

Abstract This is a user manual for the SSL2102 mains dimmable 19 W to 22 W

LED driver demo board.

User manual Rev. 1 — 1 February 2011 2 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

Revision history

Rev Date Description

v.2 20110201 second issue

Modification:

•Figure 8 - pin names corrected

v.1 24-01-2011 first issue

User manual Rev. 1 — 1 February 2011 3 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

1. Introduction

The SSL2102 19 W to 22 W LED driver is a solution for a professional application with

multiple high power LEDs that requires galvanic isolation and a safe output voltage. It is

mains dimmab le fo r bo th forward phase (tr ia c) dim m er s , an d reverse phase (tra nsis to r)

dimmers. It can generate up to 22 W output power, which is equal to a 150 W

incandescent lamp (at 63 Lumen/W). Examples are shelf lighting, down lighting, LED

lighting for bathrooms etc. The design gives an example of how to make a driver that is

suitable for small form factor applications such as retrofit lamps.

2. Safety warning

The board needs to be connected to mains voltage. Touching the reference board during

operation must be avoided at all times. An isolated housing is obligatory whe n used in

uncontrolled, non-laboratory environments. Even though the secondary circuit with LED

connection has a galvanic isolation, this isolation is not according to any regulated norm.

Galvanic isolation of the mains phase using a variable transformer is always

recommended. Th ese devices can be recognized by the symbols shown in Figure 1:

WARNING

Lethal voltage and fire ignition hazard

The non-insulated high voltages that are present wh en 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

User manual Rev. 1 — 1 February 2011 4 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

3. Connecting the board

Remark: All components referred to in the text can be located on Figure 8 “Board

schematic diagram” and connectors can be found on Figure 2 “Board connection

diagram”.

The board can be optimized for a 2 30 V 50 Hz or a 120 V 60 Hz mains supply. In addition

to the mains voltage optimization, the board is designed to work with multiple high power

LEDs with a total working voltage of between 9 V and 23 V. The output current can be

limited using trimmer R20. A dedicated LED load that is to be connected to K3 can be

delivered on request. Connector K2 can be used to attach other LED loads. The output

voltage is limited to 25 V. When attaching a LED load to an operational board (hot

plugging) an inrush peak current will occur due to the discharge of capacitor C6. After

frequent discharges, the LEDs may deteriorat e or become damaged.

If a galvanically isolated transformer is used, it should be placed between the AC source

and the dimmer/demo board. Connect a user defined LED (string) to connector K2 as

shown in Figure 2. Note tha t the anode of the LED (string) is connected to the b ottom side

of this connector.

Remark: When the board is placed in a metal enclosure, the middle pin of connector K1

should be connected to the metal casing for grounding.

Fig 2. Board co nn ec tion diagram

019aaa80

1 9 mm

K1;

pin 1: L

pin 2: Earth

pin 3: N

K2;

pin 1: LED+

pin 2: LED−

K3;

pin 1: LED+

pin 2: LED+

pin 3: LED+

pin 4: LED−

pin 5: LED−

pin 6: LED−

−

K3 J1

9 mm

User manual Rev. 1 — 1 February 2011 5 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

4. Specifications

Table 1 shows the specifications for the SSL2102 19 W to 22 W LED driver

Table 1. Specifications

Parameter Value Comment

AC line input voltage 85 V to 276 V board has been optimized for

230 V, 50 Hz or 120 V, 60 Hz

±10 % variation

DC output voltage

(LED voltage) 9V to 23V -

Output voltage protection 25 V (DC) -

Output current (LED current) 400 mA to 1050 mA adjustable with trimmer. The

120 V (AC) version is limited to

900 mA.

Output voltage /load current

dependency < ± 4 % / Volt in regulated

range see attached graphs in Section 12

“Appendix A - Load curves”

Current ripple ± 50 mA at 500 mA

Maximum output power (LED

power) 22 W at VO + 21 V. The 120 V (AC)

version is limited to 19 W.

Efficiency 70 % to 78 % at Tamb = 25 °C

see attached graphs in Section 13

“Appendix B - Efficiency curves”

graphs

Power Factor: 120 V, 60 Hz

230 V, 50 Hz 0.99 at 19 W output pow e r

0.97 at 22 W output pow e r

Switching frequency 60 kHz to 75 kHz -

Dimming range 100 % to 0 % -

Board dimensions 103 mm × 50 mm × 20 mm length × width × height

Operating temperature 0 °C to 85 °C-

Isolation voltage 1.8 kV between primary and

secondary circuit

Input voltage / load current

dependency +5 % to −6 % in the range of 130 V 60 Hz to

110 V 60 Hz

+3 % to −3 % in the range of 250 V 50 Hz to

210 V 50 Hz

User manual Rev. 1 — 1 February 2011 6 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

5. Board photos

Fig 3. Demo board (top)

019aaa80

Fig 4. Demo board (bottom)

019aaa80

User manual Rev. 1 — 1 February 2011 7 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

6. Dimmers

Several triac based dimmers have been tested by NXP Semiconductors. Because

different dimmers have different specifications, the dimming performance of the board

may vary. Table 2 provides a list of dimmers that have currently been tested with the

board:

Table 2. Dimmer selection

Manufacturer Type Voltage V

(AC) Power range

(W) Load Min. dimming

range (%)

Opus 852.390 230 60-400 Ha/Inc 0.6

Opus 852.392 230 20-500 Inc 0.05

Bush-Jaeger 2250U 230 20-600 Ha/Inc 0.03

Bush-Jaeger 2247U 230 20-500 Ha/Inc 0.07

Bush-Jaeger 6519U 230 40-550 Ha/Inc 8.4

Gira 1184 230 60-400 Inc 1

Everflourish EFO700D 230 50-300 Ha/Inc 0.2

Drespa 0817 230 20-315 Ha/Inc 3.4

Ehmann 39 Domus 230 20-500 Ha/Inc 1

Drespa 815 230 20-500 Inc 1.1

Lutron TG-600PH-WH 120 600 Inc 0 (off)

Levitron L12-6641-W 120 600 Inc 0 (off)

Levitron L02-700-W 120 600 Inc 0 (off)

Levitron 6602-IW 120 600 Inc 0 (off)

Levitron 6683-W 120 600 Inc 0 (off)

Levitron R12-6631-LW 120 600 Inc 0 (off)

Cooper 6001 120 600 Inc 0 (off)

Lutron MIR-600THW-WH 120 600 Ha/Inc 0.9

User manual Rev. 1 — 1 February 2011 8 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

7. Functional description

Remark: All components referred to in the text can be located on Figure 8 “Board

schematic diagram”.

The IC controls and drives the flyback converter part, and ensures proper dimmer

operation. Several high voltage switches are integrated in the IC. One of these controls

the flyback input power , a nd is situated between the DRAIN and SOURCE pins. When the

switch closes, energy is stored in the transformer TX1. The switch is opened when the

duty factor has exceeded the level set by the PWMLIMIT pin, by a maximum of 75 %, or

when the voltage on the SOURCE pin exceeds 0.5 V. Following this, the energy stored in

the transformer is discharged to D6 and the output capacitors C5 and C6, and finally

absorbed by the load. The converter frequency is set with an internal oscillator, the timing

of which is controlled by external RC components on pins RC and RC2. By varying the

BRIGHTNESS pin voltage, the oscillator frequency can be modulated to an upper and

lower value. The ratio between R15 and R16 sets the frequency variation.

Fig 5. Block diagram SSL2102

ISENSE SBLEED WBLEED

BLEEDER

SUPPLY

LOGIC

PROTECTION

LOGIC

OSCILLATOR

FRC

Overcurrent

Blank

Low freq

Stop

Short-winding protection

THERMAL

SHUTDOWN

POWER - UP

RESET

PWM

LIMIT

CIRCUIT

VALLEY

DRAIN

AUX

SOURCE

100 mV

0.5 V

1.5 V

VCC

BRIGHTNESS

RC2

PWMLIMIT

GND

019aab394

2, 3, 6, 7, 14,

16, 17, 18, 19

12 1 4

User manual Rev. 1 — 1 February 2011 9 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

Two other switc hes ar e re fe rr ed to as the w ea k ble ed e r (pin W BLEED) and the stron g

bleeder (pin SBLEED). When the voltage on these pins is below a certain value (typically

52 V) the SBLEED switch closes, providing a current path that loads the dimmer dur ing

zero voltage crossing. This resets the dimmer timer. When the voltage on either of these

pins is above 52 V, and the voltage on the ISENSE pin is below −100 mV, the weak

bleeder switch closes. This current is boosted using Q3 and it provides a current path that

loads the dimmer when the converter draws insufficient current to stabilize the dimmer

latching. While the strong bleeder will always switch, the weak-bleeder will not activate

until the output power drops below 8 W. This happens when the LEDs are dimmed, or

when the maximum LED power is tuned below 8 W. Figure 6 and Figure 7 represent

bleeder voltage versus time in dimmed and undimmed position (low voltage = active).

This board is optimized to work with a p ower factor above 0 .9. In order to achieve this, the

converter operates in const ant ton mode. The output power of the con verter is buffered by

capacitor C6. Due to this configuration, the circuit has a resistive input current behavior

during undimmed operation (see input in Figure 7). During dimmed operation however,

not only must the dimmer latch and hold current be maintained, but a damper must be

added to dampen the inrush current and to dissipate the electric power that was stor ed in

Fig 6. Dimmed bleeder operation

Fig 7. Undimmed bleeder operation

019aaa81

VCC

linput

WBLEED

SBLEED

019aaa81

VCC

linput

WBLEED SBLEED

User manual Rev. 1 — 1 February 2011 10 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

the LC filter within the dimmer. A serial resistor can be used for this for low power ranges

(<10 W) but for higher power ranges a single series resistor is not efficient. This is

because the converter supply current will cause significant voltage drop and thus

dissipation through this resistor. To improve efficiency, a combination of serial resistance

and a paralle l damper has been chosen for the dem onstration board. The serial r esistor is

made up of F1, R1, R2 and R12 and the parallel damper comprises C2 and R3.

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

The combination of C1, L1, L2, C3 and C4 makes a filter that blocks most of the

disturbance generated by the converter input current. A drawback of this filter is a

reduction of power factor, due to the capacitive load. A lower converter power, in relation

to the capacitive value of this filter/buffer, will cause a lower power factor. The 230 V (AC)

design uses 150 nF capacitors, which attain a power factor of 0.9 for an 11 W output

power.

The board is equipped with a feedback loop that limits the output current. This feedback

loop senses the LED current ove r sense resistor R18 and a current mirror is used,

consisting of Q1 and Q2. The current leve l can be set using R20. The same feedback lo op

is also used for overvoltage protection. If the LED voltage exceeds 23 V, a current will flow

through R19 and D9. The current through the opto-coupler IC2 will pull down the

PWMLIMIT and BRIGHTNESS pin. The on-time is zero at a value below 400 mV. The

feedback loop ha s pro po r tiona l actio n only, and the gain is critic al be ca us e of ph a se shift

caused by the converter and C6. The re lationship between PWMLIMIT and o utput current

is quadratic in nature. The resultant output current spre ad will be acceptable for most LED

applications.

The dimming range is detected by sensing th e average rectified voltage. R4, R5 and R17

comprise a voltage divider, and C9 filters the resultant signal. The converter sets its duty

factor and converter frequency accordingly.

User manual Rev. 1 — 1 February 2011 11 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

8. Board optimization

The following modifications must be made in order to meet different customer application

requirements:

Remark: All components referred to in the text can be located on Figure 8 “Board

schematic diagram”.

8.1 Changing the output voltage and LED current

Compared to other topologies, a flyback converter has the major advantage that it is

suitable for driving a broader range of output 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 increase the transformation ratio, and cause higher secondary

losses. In practice, a mains dimmable flyback converter will have an efficiency of between

80 % for high output voltages (such as 60 V) down to 50 % for low output voltages (such

as 3 V). Synchronous rectification might become advisable to reduce losses at low

voltages. The NXP Semiconductors TEA17 91 can be used for this purpose. For exact

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

AN10754, “SSL2101 dimmable mains LED driver”, and the calculation tool that is

provided with it.

8.2 Changing the output ripple current

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

resist ance and the output capacitor. The value of C6 has been chosen to optimize

capacitor size with light o utput. A ripple of ±25 % will result in an anticip ated deterioration

of light output of <1 %.

The size for the buffer capacitor can be estimated using the following equation:

(1)

Example:

For a ripple cur rent of ±5%, and a mains fre quency of 50 Hz, and a dynamic resist ance of

0.6 Ω, C6 has to be 20 ÷ (300 × 0.6) = 111 mF. For a ripple current of 25 % and a dynamic

resistance of 6 Ω, C6 has to be 4 ÷ (300 × 6) = 2200 μF. Using a series of LEDs, the

dynamic resist ance of each LED can be added to the total dynamic resistance.

8.3 Adapting to high power reverse phase (transistor) dimmers.

Reverse phase (transistor) di mmers differ in two ways that can be beneficial but can also

cause problems with dimming detection:

•The negative phase-cut (trailing edge) causes no inrush current when the dimmer

triggers. When using triac dimmers, there will be a sudden voltage difference over the

input leading to a steep charge of the input capacitors. The result ant peak current will

lead to higher damper dissipation. Because this steep charge is missing, the input

capacitors will have less stress, and the input circuit is less prone to audible noise.

Cout ILED

IΔ

-----------1

net

×Rdynamic

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

×=

User manual Rev. 1 — 1 February 2011 12 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

Transistor dimmers contain active circuitry that require a load charge during the time

that the dimmer is open. The dimensioning of the circuit generating the internal supply

voltage inside the dimm er is made cr itical in orde r to avo id e xcessive internal dimmer

losses. This means that the remaining voltage drop over the lamp must be low

enough to reach this charge. For dimmers such as the Busch-Jaeger 6519U, the

minimum lamp load is specified at 40 W which is equivalent to a 1.3 kΩ resistor load

at 230 V(AC). Such a load would result in highly inefficient operation at low output

power levels, since most energy is wasted in order to drive the dimmer, and not to

produce light.

The value of the demo board weak bleeder (R6 and R7) is chosen to minimize losses

(approximately 2 W to 3 W). The weak bleeder normally only switches on during dimmed

operation. The voltage drop with some transistor dimmers is, however, not sufficient to

cause full dimming range control (minimum 10 % instead of <1 %), because the averag e

rectified voltage is used to determine the dimming po sition. To compensate for the

reduced voltage difference, voltage detection can be made more sensitive by replacing

R4 with a zener diode, such as the BZV85-C200 for 230 V (AC), or the BZV85-C68 for

120 V (AC) applications. Because of increased sensitivity, the dimming curve will also be

steeper when using triac dimmers.

8.4 Changing the load curve

The load curve can be divid ed into two regions: on e wh er e the co ntro l loop limits the duty

cycle of the converter, and where the output current is regulated, and another where the

duty factor feedback is no longer dominant. This last part occurs at output voltages below

13 V. In this area, constant output power becomes the dominant control mechanism.

Changing the turns ratio of the transformer to match the output load will also change the

load curve.

8.5 Multiple driver support

It is possible to attach multiple converters to a single dimmer. When using triac dimmers

the inrush current will rise, although not in proportion to the number of converters used.

Transistor dimmers are more suitable for use with multiple converters because the

dimming range will increase due to the added bleeder action, and there is no inrush

current.

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User manual Rev. 1 — 1 February 2011 13 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

9. Board schematic

Fig 8. Board schematic diagram

019aaa80

R17

R25

R18

LED−

LED+ LED1..n

D10

ISO2

R13

R12

R10

R11 R23

Fuse

R26

PWMLIMIT

EARTH

to MAINS

to LED'S

RGND

R15

R14 R22

R24

R20 R21

R19

D1 D3 D6

TX1

R16

SBLEED 120

DRAIN

TC 219

RGND

TC 318

WBLEED 417

VCC 516

GND 615

SOURCE

GND 714

BRIGHTNESS 813

AUX

SBLEED 116

DRAIN

IC1

WBLEED 215

GND

VCC

314

GND

GND 413

GND

GND 512

SOURCE

BRIGHTNESS 611

AUX

RC2 710

ISENSE

WBLEED

VCC

GND/TC

BRIGHTNESS

RC2

PWMLIMIT

GND/TC

SOURCE

AUX

PWMLIMIT PWMLIMIT

PWMLIMIT

RC2 912

ISENSE

RC 10 11 PWMLIMIT

SSL2102

SO20-W

L2 L3

SSL2101

SO16

C3 C4 C5 C6

C10

C11 C7

LED−

LED+

User manual Rev. 1 — 1 February 2011 14 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

10. Bill Of Materials (BOM)

Table 3. Bill of materials 230 V (AC)

Part

No. Ref. Part Value or

part no. Power

(W) Tol.

(%) Volt

(V) Package Type Manufacturer

1 K1 Conn 3 pin 2 m - - - - SL 5.08/3/90 Weidmuller

2 K1' Conn 3 pin 2 f - - - - BL 5.08/3 Weidmuller

3 K3 Conn 6 pin 1 f - - - - BL 3.36Z Fischer

4 K2 Conn 2 pin 2 m - - - - SL 5.08/2/90 Weidmuller

5 K2' Conn 2 pin 2 f - - - - BL 5.08/2 Weidmuller

6 F1 Fusistor 6.8 Ω110-Free- -

7R1Resistor 39Ω15-Free- -

8R2Resistor 39Ω15-Free- -

9R3Resistor 1kΩ25-Free- -

10 R4 Resistor 470 kΩ0.25 1 - Free - -

11 R5 Resistor 470 kΩ0.25 1 - Free - -

12 R6 Resistor 10 kΩ1 5 200 Free - -

13 R7 Resistor 10 kΩ1 5 200 Free - -

14 R8 Resistor 2.2 kΩ1 5 200 Free - -

15 R9 Resistor 2.2 kΩ1 5 200 Free - -

16 R10 Resistor 0.4 Ω11-Free- -

17 R11 Resistor 33 kΩ0.25 5 200 Free - -

18 R12 Resistor 15 Ω1 5 200 Free - -

19 R13 Resistor 100 kΩ0.1 1 200 Free - -

20 R14 Resistor 22 kΩ0.1 1 - Free - -

21 R15 Resistor 470 kΩ0.1 1 - Free - -

22 R16 Resistor 4.7 kΩ0.1 1 - Free - -

23 R17 Resistor 12 kΩ0.1 1 - Free - -

24 R18 Resistor 0.3 Ω11-Free- -

25 R19 Resistor 10 kΩ0.1 5 - Free - -

26 R20 Resistor 50 kΩ Lin 0.1 5 - Horizontal - Bourns

27 R21 Resistor 22 kΩ0.1 1 - Free - -

28 R22 Resistor 330 Ω0.1 1 - Free - -

29 R23 Resistor 470 Ω0.25 5 Free - -

30 R24 Resistor 3.9 kΩ0.1 5 Free - -

31 R25 Resistor 470 kΩ0.25 5 Free - -

32 R26 Resistor 10 kΩ0.1 5 Free - -

33 C1 Capacitor 470 pF - 10 1k Cer DEBB33A471KC1B Murata

34 C2 Capacitor 150 nF - 10 400 Poly NRM-S154K400F NIC

35 C3 Capacitor 150 nF - 10 400 Poly NRM-S154K400F NIC

36 C4 Capacitor 150 nF - 10 400 Poly NRM-S154K400F NIC

37 C5 Capacitor 4.7 μF - 10 63 Poly B32560J475K Epcos

38 C6 Capacitor 2200 μF105°10 25 Free 2222 021 16222 Vishay

User manual Rev. 1 — 1 February 2011 15 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

39 C7 Capacitor 4.7 μF105°10 25 Free - -

40 C8 Capacitor 330 pF Y1 type 5 - Cer, Free - -

41 C9 Capacitor 10 μF105°10 25 Free - -

42 C10 Capacitor 2.2 nF - 10 4k Cer DECE33J222ZC4B Murata

43 C11 Capacitor 10 nF - 10 25 Cer, Free - -

44 L1 Inductor 680 μH - - - - 744776268 Wurth

45 L2 Inductor 330 μH - - - - 744776233 Wurth

46 L3 Inductor 100 μH - - - - 74477120 Wurth

47 TX1 Transformer N87/3F3 - - - EFD25 750340505 Wurth

48 D1 Rect. Bridge 2 A - - - SO-4 DBLS205G Taiwan semi

49 D2 TVS diode - 600 - 400 - P6KE400A Fairchild

50 D3 Diode 1 A - - 800 - HER107 Taiwan semi

51 D4 Zener - 3 - 220 - BZT03-C220 Vishay

52 D5 Diode 1 A - - 800 - HER107 Taiwan semi

53 D6 Diode 3 A - - 100 - SK310A Taiwan semi

54 D7 Diode 1 A - - 800 - HER107 Taiwa n semi

55 D8 Zener - - 5 30 - BZV55-C30 NXP

56 D9 Zener - - 5 20 - BZV55-C20 NXP

57 D10 Diode - - - 75 - 1N4148 NXP

58 Q1 Transistor NPN - - - - BC847B NXP

59 Q2 Transistor NPN - - - - BC847B NXP

60 Q3 Transistor PNP - - - - ZTX758 Zetex

61 ISO2 Opto-coupler - - - - - CNY17-1 Fairchild

62 U1 IC - - - - SO-20W SSL2102T NXP

Table 3. Bill of materials 230 V (AC) …continued

Part

No. Ref. Part Value or

part no. Power

(W) Tol.

(%) Volt

(V) Package Type Manufacturer

User manual Rev. 1 — 1 February 2011 16 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

Table 4. Bill of materials 120 V (AC)

Part

No. Ref. Part Value or

part no. Power

(W) Tole.

(%) Volt

(V) Package Type Manufacturer

1 K1 Conn 3 pin 2 m - - - - SL 5.08/3/90 Weidmuller

2 K1' Conn 3 pin 2 f - - - - BL 5.08/3 Weidmuller

3 K3 Conn 6 pin 1 f - - - - BL3.36Z Fischer

4 K2 Conn 2 pin 2 m - - - - SL 5.08/2/90 Weidmuller

5 K2' Conn 2 pin 2 f - - - - BL 5.08/2 Weidmuller

6F1Fusistor 6.8Ω110-Free- -

7R1Resistor 27Ω15-Free- -

8R2Resistor 27Ω15-Free- -

9 R3 Resistor 2.7 kΩ15-Free- -

10 R4 Resistor 470 kΩ0.25 1 - Free - -

11 R5 Resistor 0 Ω0.25 5 - Free - -

12 R6 Resistor 2.7 kΩ15200Free- -

13 R7 Resistor 2.7 kΩ15200Free- -

14 R8 Resistor 1 kΩ15200Free- -

15 R9 Resistor 1 kΩ15200Free- -

16 R10 Resistor 0.4 Ω11-Free- -

17 R11 Resistor 33 kΩ0.25 5 200 Free - -

18 R12 Resistor 10 Ω15200Free- -

19 R13 Resistor 100 kΩ0.1 1 200 Free - -

20 R14 Resistor 15 kΩ0.1 1 - Free - -

21 R15 Resistor 470 kΩ0.1 1 - Free - -

22 R16 Resistor 10 kΩ0.1 1 - Free - -

23 R17 Resistor 12 kΩ0.1 1 - Free - -

24 R18 Resistor 0.3 Ω11-Free- -

25 R19 Resistor 10 kΩ0.1 5 - Free - -

26 R20 Resistor 50 kΩ Lin 0.1 5 - Horizontal - Bourns

27 R21 Resistor 22 kΩ0.1 1 - Free - -

28 R22 Resistor 330 Ω0.1 1 - Free - -

29 R23 Resistor 3.9 kΩ0.25 5 - Free - -

30 R24 Resistor 3.9 kΩ0.1 5 - Free - -

31 R25 Resistor 100 kΩ0.25 5 - Free - -

32 R26 Resistor NP - - - Free - -

33 C1 Capacitor 470 pF - 10 1k Cer DEBB33A471KC1B Murata

34 C2 Capacitor 100 nF - 10 400 Poly NRM-S104K400F NIC

35 C3 Capacitor 330 nF - 10 400 Poly NRM-S334K400F NIC

36 C4 Capacitor 330 nF - 10 400 Poly NRM-S334K400F NIC

37 C5 Capacitor 4.7 μF - 10 63 Poly B32560J475K Epcos

38 C6 Capacitor 2200 μF105°10 25 - 2222 021 16222 Vishay

39 C7 Capacitor 4.7 μF105°10 25 Free - -

40 C8 Capacitor 330 pF - 5 Cer, Free - -

User manual Rev. 1 — 1 February 2011 17 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

41 C9 Capacitor 10 μF105°10 25 Free - -

42 C10 Capacitor 2.2 nF Y1 type 10 4k Cer DECE33J222ZC4B Murata

43 C11 Capacitor 10 nF - 10 25 Cer, Free

44 L1 Inductor 680 μH - - - - 744776268 Wurth

45 L2 Inductor 330 μH - - - - 744776233 Wurth

46 L3 Inductor 100 μH - - - - 74477120 Wurth

47 TX1 Transformer N87/3F3 - 5 - EFD25 750340505 Wurth

48 D1 Rect Bridge 2 A - - - SO-4 DBLS205G Taiwan semi

49 D2 T VS di ode - 600 - 270 - P6KE270A Fairchild

50 D3 Diode 1 A - - 80 0 - HER107 Taiwan semi

51 D4 Zener - 3 - 220 - BZT03-C220 Vishay

52 D5 Diode 1 A - - 80 0 - HER107 Taiwan semi

53 D6 Diode 3 A - - 10 0 - SK310A Taiwan semi

54 D7 Diode 1 A - - 80 0 - HER107 Taiwan semi

55 D8 Zener - - 5 30 - BZV55-C30 NXP

56 D9 Zener - - 5 20 - BZV55-C20 NXP

57 D10 Diode - - - 75 - 1N4148 NXP

58 Q1 Transistor NPN - - - - BC847B NXP

59 Q2 Transistor NPN - - - - BC847B NXP

60 Q3 Transistor PNP - - - - MPSA92 NXP

61 ISO2 Opto-coupler - - - - - CNY17-1 Fairchild

62 U1 IC - - - - SO-20W SSL2102T NXP

Table 4. Bill of materials 120 V (AC) …continued

Part

No. Ref. Part Value or

part no. Power

(W) Tole.

(%) Volt

(V) Package Type Manufacturer

User manual Rev. 1 — 1 February 2011 18 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

11. Transformer specification

Figure 9 shows the transformer schematic:

11.1 Turns ratio

•(1 -2) : (4 - 5) = 1 : 0.494 ±2%

•(1 -2) : (6 - 9) = 1 : 0.247 ±2%

11.2 Electrical characteristics

•Nominal frequency = 100 kHz

11.3 Core and bobbin1 x

•Core: EFD25, 3F3/N87, air gap center 1100 μm

•Bobbin: CSH-EFD25-1S-10P

11.4 Physical dimensions

Fig 9. Transformer schematic

019aab06

N3N1

Table 5. Inductance

Section Inductance

N1 1.08 mH ±7%, at 1.6A

N2 70 μH

N3 270 μH

Fig 10. Transformer dimensions

019aaa81

25.2 max

3.6

12.55

max 12

−0.2 5.53

+0.1 6.9

−0.1

11.78 + 0.1

13.1 − 0.2

18 − 0.2

∅ 0.8

26.2 max

22.5

16.4 min

1.3

±0.15

Dimensions in mm

User manual Rev. 1 — 1 February 2011 19 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

12. Appendix A - Load curves

Fig 11. 120 V (AC) load curve

Fig 12. 230 V (AC) load curve

Vout (V)

8242012 16

019aaa800

1100

1300

1500

Iout

(mA)

900

Vout (V)

8242012 16

019aaa801

1100

1300

1500

Iout

(mA)

900

User manual Rev. 1 — 1 February 2011 20 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

13. Appendix B - Efficiency curves

Fig 13. 120 V (AC) efficiency curve

Fig 14. 230 V (AC) efficiency curve

Vout (V)

8242012 16

019aaa802

efficiency

(%)

Vout (V)

8242012 16

019aaa803

efficiency

(%)

User manual Rev. 1 — 1 February 2011 21 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

14. Appendix C - Input voltage dependency

a. 120 V (AC) b. 230 V (AC)

Fig 15. Input voltage/output current dependency

Vin (V)

100 110 120 130 135125115105

019aaa804

850

1050

1250

Iout

(mA)

650

Vin (V)

210 250240220 230

019aaa805

1080

1120

1040

1160

1200

Iout

(mA)

1000

User manual Rev. 1 — 1 February 2011 22 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

15. Appendix D - Mains conducted harmonics

16. References

[1] AN10831 — SSL2102 30 W flyback TRIAC dimmable LED driver

[2] AN10754 — SSL2101 and SSL2102 dimmable mains LED driver

Table 6. Mains conducted harmonic values

Harmonic 230 V (AC) 50 Hz amplitude (%) 120 V (AC) 60 Hz ampli tude (%)

PF 0.97 0.99

1 100 100

20 0

313.6 10.7

40 0

55.5 3.7

60 0

71.6 0.9

80.2 0

92.5 1.9

10 0 0

11 1.1 0.6

12 0 0

13 2.5 1.7

14 0 0

15 1.7 1.1

16 0 0

17 0.9 0.2

18 0 0.1

19 2.9 0.8

20 0 0

User manual Rev. 1 — 1 February 2011 23 of 24

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

17. Legal information

17.1 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 liab ility for the consequences of

use of such information.

17.2 Disclaimers

Limited warr a nty and liability — Information in this document is believed to

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

representations or warrant ies, 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.

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

punitive, special or consequ ential damages (including - wit hout 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.

Notwithstanding any damages that customer might incur for any reason

whatsoever, NXP Semiconduct ors’ aggregate and cumulati ve liability toward s

customer for the products described herein shall be limited in accordance

with the Terms and conditions of commercial sale of NXP Semicondu ctors.

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 informa tion supplied prior

to the publication hereof .

Suitability for use — NXP Semiconductors products are not designed,

authorized or warranted to be suit able for use in life support, life-crit ical 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 — Applica tions 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 modifi cation.

Customers are responsible for the design and operation of their applications

and products using NXP Semiconductor s products, and NXP Semiconductors

accepts no liability for any assistance with applications or customer product

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

Semiconductors product is su itable and f it 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 ri sks associated with their

applications and products.

NXP Semiconductors does not accept any liabili ty 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 custo m er(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.

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

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

authorization from national authorities.

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 supplie rs expressly disclaim all warrant ies, whether express, implied

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

non-infringement, mercha ntability 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.

In no event shall NXP Semiconductors, it s aff iliates or thei r suppliers be liable

to customer for any special, indirect, consequ ential, punitive or incidental

damages (including without li mit ation d amages for l oss of bu siness, bu siness

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), st rict liability, breach of contract, breach of warranty or

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

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 li ability 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 d ollars (US$5. 00). The for egoing limita tions, exclusions

and disclaimers shall apply to the maximum extent permitted by applicable

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

Safety of high-voltage evaluation products — The non-insulated high

voltages that ar e present when operating this produc t, co nstitute a risk of

electric shock, personal injury, death and/or ignition of fire. This product is

intended for evaluation pur poses only. It shall be operated in a designated

test area by personnel that is qual ified according to local requirements and

labor laws to work with non-insulated mains voltages and high-voltage

circuits.

The product does not comply with IE C 60950 based national or regional

safety standards. NXP Semiconductors does not accept any liab ility for

damages incurred due to inappropriate use of this product or rela ted to

non-insulated high volt ages. Any use of this produ ct is at cust omer’s own risk

and liability. The customer shall fully indemnify and hold harmless NXP

Semiconductors from any liability, damages and claims resulting from the use

of the product.

17.3 Trademarks

Notice: All referenced b rands, produc t names, service names and trademarks

are the property of their respective ow ners.

NXP Semiconductors UM10386

SSL2102 19 W to 22 W mains dimmable LED driver

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

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

Date of release: 1 February 2011

Document identifier: UM 10386

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

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

18. Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Safety warning . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3 Connecting the board . . . . . . . . . . . . . . . . . . . . 4

4 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5 Board photos . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 Dimmers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

7 Functional description . . . . . . . . . . . . . . . . . . . 8

8 Board optimization . . . . . . . . . . . . . . . . . . . . . 11

8.1 Changing the output voltage and LED

current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8.2 Changing the output ripple current . . . . . . . . . 11

8.3 Adapting to high power reverse phase

(transistor) dimmers.. . . . . . . . . . . . . . . . . . . . 11

8.4 Changing the load curve. . . . . . . . . . . . . . . . . 12

8.5 Multiple driver support . . . . . . . . . . . . . . . . . . 12

9 Board schematic . . . . . . . . . . . . . . . . . . . . . . . 13

10 Bill Of Materials (BOM) . . . . . . . . . . . . . . . . . . 14

11 Transformer specification. . . . . . . . . . . . . . . . 18

11.1 Turns ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

11.2 Electrical characteristics. . . . . . . . . . . . . . . . . 18

11.3 Core and bobbin1 x . . . . . . . . . . . . . . . . . . . . 18

11.4 Physical dimensions. . . . . . . . . . . . . . . . . . . . 18

12 Appendix A - Load curves. . . . . . . . . . . . . . . . 19

13 Appendix B - Efficiency curves . . . . . . . . . . . 20

14 Appendix C - Input voltage dependency . . . . 21

15 Append ix D - Mains conducted harmonics. . 22

16 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

17 Legal information. . . . . . . . . . . . . . . . . . . . . . . 23

17.1 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

17.2 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 23

17.3 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 23

18 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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