UM10406 Datasheet PDF - NXP Semiconductors
Part Number | UM10406 | |
Description | SSL1523 high power factor 5W LED driver | |
Manufacturers | NXP Semiconductors | |
Logo | ||
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SSL1523 high power factor 5 W LED driver for universal
mains
Rev. 01 — 3 August 2010
User manual
Document information
Info Content
Keywords
SSL1523, SSL152x family, LED driver, mains supply, AC/DC conversion
Abstract
This user manual describes a demonstration (demo) board for a mains
operated non-dimmable 5 W LED driver using the SSL1523 SMPS
controller IC.
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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.
pin 1: L
pin 2:
pin 3: N
K1
control input from
external opto coupler
pin 2: − pin 1: +
pin 2: LED −
K4
pin 1: LED +
K2
K3
pin 6: LED −
pin 5: LED −
pin 4: LED −
pin 3: LED +
pin 2: LED +
pin 1: LED +
J1
J2
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Fig 3. Demo board connection diagram
019aaa134
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
UM10406
User manual
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 ton mode. The output power of the converter is buffered by capacitor C10, and
therefore the circuit exhibits resistive input current behavior (see Figure 4).
All information provided in this document is subject to legal disclaimers.
Rev. 01 — 3 August 2010
© NXP B.V. 2010. All rights reserved.
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