UM10516
230 V 7 W GU10 buck converter SSL2101 reference board
Rev. 1 — 27 March 2012 User manual
Document information
Info Content
Keywords SSL2101, buck, LED driver, dimmable, GU10, high-Power Factor (PF)
Abstract This document describes the application and operation of a 230 V 7 W
dimmable LED driver featuring SSL2101. The reference board has a form
factor that is compatible with the base of a GU10 LED lamp fittings used in
Solid-State Lighting (SSL) applications.
UM10516 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 27 March 2012 2 of 16
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors
UM10516
230 V 7 W GU10 buck converter SSL2101 reference board
Revision history
Rev Date Description
v.1 20120327 first issue
UM10516 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 27 March 2012 3 of 16
NXP Semiconductors
UM10516
230 V 7 W GU10 buck converter SSL2101 reference board
1. Introduction
This document describes the application and operation of a 230 V 7 W dimmable LED
driver featuring SSL2101. The reference board has a GU10 LED lamp compatible form
factor. The buck converter topology provides a simple and efficient solution for mains
dimmable LED recessed light applications not requiring galvanic isolation.
Remark: Unless otherwise stated, all voltages are in V.
The total input power (VA) to the board is 230 V/41 mA = 9.4 W. The board is design ed to
drive a 5-LED load, delivering an output power of 6.5 W at 415 mA and 15.6 V (DC). The
Power Factor (PF) is 0.9 which give an actual input power of 0.9 9.4 W = 8.5 W. The
resulting efficiency is 76 %. The Total Harmonic Distortion (THD) is 30 %. The board
complies with EMI and safety regulations.
Audible noise requirements of < 25 dBA are realized across the complete dimming range
of currently available dimmers in the market.
The board dimensions are shown in Figure 1
. The board is designed with the components
allowing enough headroom when the board is inserted into a GU10 lamp base.
The assembled top and bottom board views are shown in Figure 2
and Figure 3.
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. Dimensions of the reference board
aaa-002431
18 mm
30.8 mm
18.1 mm
8.7 mm
15.3 mm
UM10516 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 27 March 2012 4 of 16
NXP Semiconductors
UM10516
230 V 7 W GU10 buck converter SSL2101 reference board
Fig 2. Reference board (top view)
Fig 3. Reference board (bottom view)
UM10516 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 27 March 2012 5 of 16
NXP Semiconductors
UM10516
230 V 7 W GU10 buck converter SSL2101 reference board
2. Safety warning
This board is connected to the mains voltage. Avoid touching the board while it is
connected to the mains voltage. An isolated housing is obligatory when used in
uncontrolled, non-laboratory environments. Galvanic isolation o f the ma ins phase usin g a
variable transformer is always recommended.
3. Specifications
a. Isolated b. Non-isolated
Fig 4. Variable transformer (Variac) isolation symbols
019aab173
019aab174
Table 1. Specifications for the reference board
Symbol Parameter Value
V
mains
AC mains supply voltage 230 V
V
LED
DC output voltage 15.6 V
I
LED
output current 415 mA
I
o
/V
o
output voltage rejection 2 mA/V
efficiency 76 %
PF Power Factor 0.9
f
sw
switching frequency 85 kHz
UM10516 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 27 March 2012 6 of 16
NXP Semiconductors
UM10516
230 V 7 W GU10 buck converter SSL2101 reference board
4. Functional description
4.1 General
The 230 V, 7 W buck reference board uses the SSL2101 con trol IC to drive a load of up to
5-LEDs. The SSL2101 is a Switched Mode Power Supply (SMPS) controller with an
integrated MOSFET. Detailed information about the SSL2 101 operation is contained in the
SSL2101 SMPS IC for dimmable LED lighting data sheet.
The converter operates in Discontinuous Conduction Mode (DCM) or Boundary
Conduction Mode (BCM). In BCM, valley switching detection is used to minimize magnetic
component and switching losses while enhancing efficiency . A valley-fill circuit is added to
obtain high-power factor.
The reference board is triac dimmable and can be used in combination with most leading
and trailing edge dimmers. During dimming, the rectified mains voltage is averaged and
attenuated and supplied to both BRIGHTNESS and PWMLIMIT pins of the SSL2101. As a
consequence, the converter duty cycle or frequency is reduced and as a result the LED
output current.
Dimming compatibility is defined as smooth dimming without any flashing artifacts across
the complete dimming range. This reference board provides a dimming compatibility of
> 85 % when tested with a current selection of 30 trailing and leading-edge dimmers.
5. Reference board connections
The GU10 LED driver board takes a 230 V, 50 Hz mains supply and supports a 5-LED
load.
Remark: Make all connections with the input power is switched off.
• Connect the 5-LED load as output load together with power meter at both inputs and
outputs.
• Connect V
IN
(230 V/50 Hz) using an isolating transformer to the input connection
points of the buck converter. Alternatively use an AC power supply with limited output
current capability (for example; 200 mA).
• Increase V
IN
to 230 V and measure the different parameters as shown in Table 2.
• When testing dimmer compatibility, connect a leading or trailing edge dimmer
between V
IN
and the buck converter input connection points.
Remark: Use protective a shield over application and never touch the board when
measuring or testing.
Table 2. Input and output parameters
VIN (V) II (mA) PF P (W) V
O
I
O
P
O
(%)
230 41 0.9 8.5 15.6 415 6.5 0.76
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