UM10406
SSL1523 high power factor 5 W LED driver for universal
mains
Rev. 01 — 3 August 2010
User manual
Document information
Info
Keywords
Abstract
Content
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.
NXP Semiconductors
UM10406
SSL1523 5 W LED driver
Revision history
Rev
01
Date
20100803
Description
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
UM10406
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
User manual
Rev. 01 — 3 August 2010
2 of 21
NXP Semiconductors
UM10406
SSL1523 5 W LED driver
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.
Table 1.
Parameter
AC line input voltage
Output voltage (LED voltage)
Output voltage protection
Output current (LED current)
Input voltage/load current dependency
Specification
Specification
100 V (AC) to 254 V (AC)
19 V (nominal): 12 V to 25 V
range
33 V (DC)
200 mA up to 250 mA
Comment
board has been optimized for 230 V (AC) or
120 V (AC)
±
10 % variation
-
-
adjustable with potentiometer
±
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)
the maximum output power is not exceeded;
see graphs
Figure 9
and
Figure 10.
at 250 mA
at V
out
= +19 V
at T
amb
= 25
°C,
V
out
= +19 V; see graphs
Figure 11
and
Figure 12.
at 5 W output power; 19 V, V
out
= +19 V
-
Output voltage/load current dependency
±
4
%
/Volt in regulated range
Current ripple
Maximum output power (LED power)
Efficiency
Power Factor:
120 V (AC)
230 V (AC)
Switching frequency
0.98
0.90
90 kHz to 110 kHz
±
75 mA
±
30 %
5W
>80
%
UM10406
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
User manual
Rev. 01 — 3 August 2010
3 of 21
NXP Semiconductors
UM10406
SSL1523 5 W LED driver
Table 1.
Parameter
Specification
…continued
Specification
50 mm
×
86 mm
×
1.6 mm
0
°C
to 85
°
C
±
4 kV
Comment
-
-
between the primary and secondary circuits
Board dimensions
Operating temperature
Isolation voltage
3. Demo board views
019aaa132
Fig 1.
Demo board top
019aaa133
Fig 2.
Demo board bottom
UM10406
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
User manual
Rev. 01 — 3 August 2010
4 of 21
NXP Semiconductors
UM10406
SSL1523 5 W LED driver
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: LED +
K2
pin 1: L
pin 2:
pin 3: N
K1
K4
K3
pin 6: LED
−
pin 5: LED
−
pin 4: LED
−
pin 3: LED +
pin 2: LED +
pin 1: LED +
J1
J2
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
on
mode. The output power of the converter is buffered by capacitor C10, and
therefore the circuit exhibits resistive input current behavior (see
Figure 4).
UM10406
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
User manual
Rev. 01 — 3 August 2010
5 of 21
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