UM10873 SSL5231BDB1288 230 V 24 W dimmable buck converter

UM10873 SSL5231BDB1288 230 V 24 W dimmable buck converter
UM10873
SSL5231BDB1288 230 V 24 W dimmable buck converter
Rev. 1 — 23 April 2015
User manual
Document information
Info
Content
Keywords
SSL5231BDB1288, SSL5231BT, dimmable, LED driver, buck converter,
fixture, eco-THD
Abstract
This user manual describes the operation of the SSL5231BDB1288 230 V
24 W eco-THD dimmable LED driver featuring the SSL5231BT. The
SSL5231BDB1288 demo board uses a buck topology. It incorporates a
form factor that complies with the Zaga standard.
UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
Revision history
Rev
Date
Description
v.1
20150423
first issue
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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SSL5231BDB1288 230 V 24 W dimmable buck converter
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 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.
This user manual describes the operation of the SSL5231BDB1288 230 V 24 W eco-THD
dimmable LED driver. The SSL5231BDB1288 demo board incorporates a form factor that
complies with the Zaga standard. The buck converter topology provides a simple and
efficient solution for mains dimmable LED recessed light applications with a very good
dimmer compatibility.
The SSL5231BDB1288 demo board complies with EMI and safety regulations.
Figure 2 shows dimensions of the SSL5231BDB1288 demo board. The board size and
the components used ensure that the board fits into a Zaga compliant form factor for
fixtures. Figure 3 shows the top view and bottom view of the SSL5231BDB1288 demo
board.
2. Safety warning
The demo board input is connected to the 230 V mains supply. Avoid touching the board
while it is connected to the mains voltage and when it is in operation. An isolated housing
is obligatory when used in uncontrolled, non-laboratory environments. Galvanic isolation
from the mains phase using a fixed or variable transformer is always recommended.
Figure 1 shows the symbols on how to recognize these devices.
019aab174
019aab173
a. Isolated
Fig 1.
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User manual
b. Not isolated
Isolation symbols
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SSL5231BDB1288 230 V 24 W dimmable buck converter
3. Specifications
Table 1 lists the specification of the SSL5231BDB1288 demo board.
Table 1.
SSL5231BDB1288 specifications
Symbol
Parameter
Value
Vmains
AC mains supply voltage
230 V (AC); 20 %
Imains
AC mains input current
125 mA
VLED
output voltage
48 V
ILED
output current
440 mA
ILED/ILED(nom)Vmains
line regulation
5 % at Vmains 10 %
ILED/ILED(nom)VLED
load regulation
5 % at VLED; 20 %

efficiency
87 %
PF
power factor
0.9
ILED(ripple)
output current ripple
6%
Toper
operating temperature
40 C to +100 C
-
board dimensions
38 mm  107 mm
-
conducted ElectroMagnetic
Interference (EMI)
EN55015
-
IEC61000-3-2
class C (for Pin < 25 W limit)
Figure 2 shows the dimensions of the demo board.
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UM10873
User manual
SSL5231BDB1288 demo board dimensions
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SSL5231BDB1288 230 V 24 W dimmable buck converter
4. Board photographs
a. Top view
b. Bottom view
Fig 3.
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SSL5231BDB1288 demo board photographs
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SSL5231BDB1288 230 V 24 W dimmable buck converter
5. Board connections
The SSL5231BDB1288 demo board is optimized for a 230 V/50 Hz supply. In addition to
the mains voltage optimization, the board is designed to work with multiple LEDs or an
LED module with a low forward voltage. The mains connection of the SSL5231BDB1288
demo board is different from other demo boards. Connect the mains to the screw
connector K1.
Remark: The maximum rated voltage of the board is 276 V (AC).
:%
)
The anode of the LED load is connected to pin 1 of connector K2. The cathode is
connected to pin 2 of connector K2. Use an LED string with a forward voltage between
30 V and 48 V on the SSL5231BDB1288 demo board. Under the expected conditions, the
output current is 440 mA when no dimmer is used.
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UM10873
User manual
SSL5231BDB1288 board connections
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SSL5231BDB1288 230 V 24 W dimmable buck converter
6. Functional description and options
6.1 Input filtering
Capacitors C2 and C4 and inductors L1, L2 and L3 filter the switching current from the
buck converter to the line. Capacitors C2 and C4 also provide a low-impedance path for
the switching current. The value of capacitor C2 is selected so the application passes for
both conducted and radiated EMI.
Metal oxide varistor RV1 and transient suppressor D6 provide adequate protection
against transient surge voltages.
6.2 Open-load protection
The driver board is protected when the LED load is accidentally left open. The open-load
protection is a non-latched protection. It recovers when the LED string is reconnected.
The LED current is not controlled when reconnecting which can destroy the LED string.
So turn off the mains before reconnecting the LED load.
Two circuits set the open-load output voltage. One circuit (R23) sets the open output
voltage when the IC does not operate because of a defect. The other circuit (OVP) sets it
when the IC is operating normally. In all cases, the output voltage must never exceed the
rated DC voltage of the output capacitor.
6.2.1 IC not operating
The voltage divider, consisting of resistors R7 and R8, sets the output voltage from the
VCC pin of the IC to the GND pin of the IC and resistor R23.
R23
V o =  V bus – V CC   -----------------------------------R7 + R8 + R23
(1)
n  2.5 V
As a rule of thumb, limit resistor R23 to ---------------------------- .
2  190 A
In this way, the voltage is not sufficient to turn on the LEDs (n is the number of LEDs in
series at the output).
The non-operating output voltage must not be equal to or exceed the voltage set by the
operating mode. It is good practice to set the level in non-operating mode 5 V to 10 V
lower than in operating mode.
6.2.2 IC operating with OVP
When the voltage in the non-operating mode is set to a safe level for the output capacitor,
the voltage in the operating mode can be set. The OVP is triggered when during four
consecutive high-frequency cycles, 1.8 V is detected at the DEMOVP pin. The output
voltage is set with Equation 2:
R21 + R22
V o = 1.8   1 + --------------------------

R20 
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SSL5231BDB1288 230 V 24 W dimmable buck converter
The output voltage must never exceed the rated DC voltage of the output capacitor. Do
not use a resistor value that exceeds 5.6 k for resistor R20. The DEMOVP pin is a
high-ohmic input. So it is sensitive to disturbance causing false OVP triggering.
6.3 LED current and sense resistor
To optimally profit from the excellent current stability of the SSL5231B overtemperature,
50 ppm MELF type resistors are recommended to sense the LED current. The output
current stability range drops to 3 % compared to 7 % over the full temperature range for
normal 200 ppm 1210 type resistors.
6.3.1 Single resistor sensing
Figure 5 shows the principle of single resistor sensing. Single resistor sensing is the
traditional way of sensing the peak current through the switch and inductor.
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Fig 5.
Single resistor sensing principle
The LED current for single resistor sensing is calculated with Equation 3:
0.31
I LED = ------------R ISNS
(3)
When a dimmer is used, the typical maximum peak current that can be reached equals:
1.8
I peak  max  = ------------R ISNS
(4)
For this application, the LED current amounts 440 mA, which means a sense resistor of
0.7  is required. Using this resistor value would result in a maximum peak current of
1.8 V
-------------- = 2.57 A .
0.7 
The maximum allowed input current II(SW) = 2 A limits the current through the switch of the
IC. To limit the peak current for this application, use split resistor current sensing (see
Section 6.3.2).
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SSL5231BDB1288 230 V 24 W dimmable buck converter
6.3.2 Split resistor sensing
Figure 6 shows the principle of split resistor sensing. The peak of the primary stroke the
inductor current flows through both sense resistors and during the secondary stroke the
inductor current only flows through the secondary sense resistor.
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Split resistor sensing principle
When split resistor sensing is applied, Equation 5 represents the LED current:
V intregd  max ISNS
I LED = ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------V LED
1
R ISNS  sec  + f sw  -----------------------------------   ------ – t dead   R ISNS  pri  + R bondwire 
 f sw

2
---  V mains  2

(5)
The condition for Equation 5 to be valid is:
V I  max ISNS
1
--------------------------  ----------------------------------------------------1
0.9  I I  SW  R ISNS  pri  + R ISNS  sec 
(6)
Figure 7 shows Equation 6. The regulated and maximum current magnitude is shown as a
function of time. The regulated peak current must never exceed the maximum allowed
current through the SW pin. To be on the safe side, a 10 % margin is taken into account.
So, II(SW)  0.9 = Ipeak(max) = 1.8 A.
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SSL5231BDB1288 230 V 24 W dimmable buck converter
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Fig 7.
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Inductor current magnitude as function of time
For the SSL5231BDB1288 demo board, the maximum peak current is limited to
Ipeak(reg) = 1.33 A, according to:
V I  max ISNS
I peak  reg  = ----------------------------------------------------R ISNS  pri  + R ISNS  sec 
(7)
Figure 7 also shows the curve Ipeak(example). The maximum value of Ipeak(example)
approaches Ipeak(max).
For this situation, other values are used for the sense resistors on the demo board, where:
• RISNS(pri) = R18 // R19 = 0.91 // 0.91  = 0.455 
• RISNS(sec) = R14 // R15 // R16 = 1.6 // 1.6 // 1.8  = 0.554 .
Resistor R17 is not mounted.
The result is a better THD of the application at the cost of a significantly higher switching
current of 1.75 A through the IC and MOSFET Q1. Also, a higher saturation current is
required for inductor L4, compared to the situation where Ipeak is set to 1.33 A. The
saturation current of inductor L4 is at least 2 A (see Section 12).
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SSL5231BDB1288 230 V 24 W dimmable buck converter
C3; Z3 = IL4
C4 = Vmains
Fig 8.
Inductor current waveform
Figure 8 shows the inductor current of the SSL5231BDB1288 demo board over two mains
periods next to a detailed view over 100 s, while it is regulated to Ipeak(reg).
6.4 Output current ripple
The output ripple of the demo board is calculated with Equation 8:
I O  max  – I O  min 
I LED  ripple  = -------------------------------------------  100 %
I O  max  + I O  min  
(8)
With all three output capacitors used on the SSL5231BDB1288 demo board and a load of
16 LEDs of the LumiLED LXML-PWN2 series, the ripple equals 6 %. The output current
ripple strongly depends on the dynamic resistance of the LED load and the output
capacitance of the demo board. When an LED load with a higher dynamic resistance than
the dynamic resistance of the LumiLED LXML-PWN2 LEDs is used, the output current
ripple decreases. Also, when a higher ripple is allowed, the output capacitance can be
decreased. By default 3  470 F is used on the SSL5231BDB1288 demo board.
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SSL5231BDB1288 230 V 24 W dimmable buck converter
7. Performance
The performance was measured using an LED load with a 48 V forward at a 440 mA LED
output current. Figure 9 to Figure 14 show the performance data.
7.1 Efficiency
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Efficiency as a function of AC mains input voltage
7.2 Power Factor
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Fig 10. Power factor as a function of AC mains input voltage
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SSL5231BDB1288 230 V 24 W dimmable buck converter
7.3 Line regulation
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Fig 11. Output current as a function of AC mains input voltage
7.4 Load regulation
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Fig 12. Output current as a function of output voltage at nominal mains
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SSL5231BDB1288 230 V 24 W dimmable buck converter
7.5 Dim curves
Figure 13 shows the output current when a leading-edge dimmer or a trailing-edge
dimmer is used. The output current without dimmer is also indicated.
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(1) Trailing-edge
(2) Leading-edge
Fig 13. Output current as a function of dimmer angle
Dimming compatibility includes smooth dimming without any flashing or flickering effects
across the complete dimming range. The SSL5231BDB1288 demo board has been tested
with a wide selection of dimmers. It is compatible with most leading-edge and
trailing-edge dimmers on the market.
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SSL5231BDB1288 230 V 24 W dimmable buck converter
7.6 Power losses
Figure 14 shows the power losses when a leading-edge or a trailing-edge dimmer is used.
The power losses when no dimmer is used are also indicated. Power losses are defined
as the difference between input power and output power. They indicate the total power
loss in the converter.
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(2) Trailing-edge
Fig 14. Power losses as a function of dimmer angle
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SSL5231BDB1288 230 V 24 W dimmable buck converter
7.7 ElectroMagnetic Interference (EMI)
The Electro Magnetic Interference (EMI) was measured according to the EN55015
standard. The board complies with the requirements. Figure 15 shows the measurement
results.
a. AC mains (Live)
b. AC mains (Neutral)
Fig 15. Conducted EMI performance
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SSL5231BDB1288 230 V 24 W dimmable buck converter
Fig 16. Radiated EMI performance
When the SSL5231BDB1288 demo board is used in a plastic enclosure, put a 47 H
common-mode choke between the demo board output and the LED load to make it pass
the radiated EMI requirement.
8. Protections
The IC incorporates the following protections:
•
•
•
•
•
•
UnderVoltage Lockout (UVLO)
Cycle-by-cycle OverCurrent Protection (OCP)
Internal OverTemperature Protection (OTP)
Cycle-by-cycle maximum on-time protection
Output OverVoltage Protection (OVP)
Output Short Protection (OSP)
For more detailed information about the IC protections, see the SSL5231BT data sheet
(Ref. 1).
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NXP Semiconductors
UM10873
User manual
9. Schematic
9.1 SSL5231BDB1288 minimum component count schematic diagram
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Fig 17. SSL5231BDB1288 minimum component count schematic diagram
UM10873
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SSL5231BDB1288 230 V 24 W dimmable buck converter
Rev. 1 — 23 April 2015
All information provided in this document is subject to legal disclaimers.
59
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UM10873
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SSL5231BDB1288 230 V 24 W dimmable buck converter
Rev. 1 — 23 April 2015
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UM10873
User manual
9.2 SSL5231BDB1288 full schematic diagram
UM10873
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SSL5231BDB1288 230 V 24 W dimmable buck converter
10. Bill Of Materials (BOM)
10.1 SSL5231BDB1288 demo board minimum component count BOM
The application is built on a single-layer board using many SMD components. These
components are limited in voltage rating and power handling capability. Figure 17 shows
the minimum component count schematic of the application. The minimum number of
components is 58.
Table 2.
UM10873
User manual
SSL5231BDB1288 demo board minimum component count BOM
Reference
Description and values
BD1
bridge rectifier; 600 V; 2 A
C2
capacitor; 100 nF; 400 V
C4
capacitor; 220 nF; 400 V
C5
capacitor; 2.2 F; 50 V
C6
capacitor; 2.2 F; 6.3 V
C7
capacitor; 47 nF; 50 V
C8
capacitor; 470 pF; 630 V
C9
capacitor; 1.5 mF; 50 V
C12
capacitor; 1 nF; 50 V
C13
capacitor; 470 pF; 50 V
C14
capacitor; 100 pF; 630 V
C16
capacitor; 1.5 nF; 50 V
C17
capacitor; 68 pF; 500 V
C18
capacitor; 10 nF; 100 V
D1
diode; zener; 6.8 V; 300 mA
D2
diode; high speed; 100 V/250 mA
D3
diode; ultrafast; 600 V; 3 A
D4
diode; zener; 12 V; 250 mA
D5
diode; high speed; 100 V; 300 mA
D6
diode; transient voltage suppression; 440 V; 600 mA
D7
diode; rectifier; general purpose; 600 V; 1 A
D8
diode; dual; high speed; 100 V; 215 mA
F1
fuse; slow-blow; 250 V; 2 A
L1; L2; L3
inductor; 1.5 mH; 430 mA; 1.7 
L4
inductor; 660 H; 1.9 A; EFD20
Q1; Q3
MOSFET; N-channel; 600 V; 2.4 A
Q2; Q4
transistor; NPN; general purpose; 45 V; 100 mA
Q5
transistor; NPN; high-voltage; high speed; 400 V; 1 A
R1; R2; R3
resistor; 4.7 k; 5 %; 250 mW
R4
resistor; 2 M; 5 %; 250 mW; 500 V
R6
resistor; 22 k; 5 %; 63 mW
R7
resistor; 360 k; 5 %; 250 mW; 500 V
R9
resistor; 1.8 M; 5 %; 250 mW; 500 V
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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SSL5231BDB1288 230 V 24 W dimmable buck converter
Table 2.
UM10873
User manual
SSL5231BDB1288 demo board minimum component count BOM …continued
Reference
Description and values
R11
resistor; 27 k; 5 %; 63 mW
R12
resistor; 910 k; 5 %; 63 mW
R16; R17; R18
resistor; 0.9 ; 5 %; 500 mW
R20
resistor; 5.1 k; 5 %; 63 mW
R21
resistor; 160 k; 5 %; 250 mW
R23
resistor; 82 k; 5 %; 100 mW
R24
resistor; 100 ; 5 %; 63 mW
R25
resistor; 82 k; 5 %; 250 mW
R26
resistor; 1.5 k; 5 %; 500 mW; 500 V
R27
resistor; 100 ; 5 %; 100 mW
R28
resistor; 200 k; 5 %; 250 mW; 500 V
R30
resistor; 270 ; 5 %; 5 W
R33
resistor; 510 k; 5 %; 250 mW; 500 V
R35
resistor; 330 k; 5 %; 100 mW
R36
resistor; 33 ; 5 %; 2 W
R37
resistor; 3.3 k; 5 %; 63 mW
RV1
metal oxide varistor; 230 V; 17 J
U1
dimmable buck LED driver
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Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
10.2 SSL5231BDB1288 demo board full BOM
Figure 18 shows the schematic diagram of the SSL5231BDB1288 demo board. The
schematic shows all the components present on the demo board. Table 3 shows the
complete BOM of the SSL5231BDB1288 demo board.
Table 3.
Reference
SSL5231BDB1288 demo board full BOM
Description and values
Part number
Manufacturer
BD1
bridge rectifier; 600 V; 2 A
DBLS205G
Taiwan Semiconductor
C2
capacitor; 100 nF; 5 %; 400 V; PET; THT
ECQE4104JF
Panasonic
C4
capacitor; 220 nF; 5 %; 400 V; PET; THT
ECQE4224JF
Panasonic
C5
capacitor; 2.2 F; 10 %; 50 V; X7R; 0805
UMK212BB7225KG-T
Taiyo Yuden
C6
capacitor; 2.2 F; 10 %; 6.3 V; X5R; 0603 -
-
C7
capacitor; 47 nF; 10 %; 50 V; X7R; 0603
-
C8
capacitor; 470 pF; 5 %; 630 V; X7R; 1206 MC1206B471K631CT
Multicomp
C9; C10;
C11
capacitor; 470 F; 20 %; 50 V; ALU; THT
EEUFC1H471L
Panasonic
C12
capacitor; 1 nF; 10 %; 50 V; X7R; 0805
-
-
C13
capacitor; 470 pF; 10 %; 50 V; X7R; 0805 -
-
C14
capacitor; 100 pF; 10 %; 630 V; X7R;
0805
C0805C101KBRACTU
KEMET
C16
capacitor; 1.5 nF; 10 %; 50 V; X7R; 0805
-
-
C17
capacitor; 68 pF; 10 %; 630 V; X7R; 0805 C0805C680KBRACTU
KEMET
C18
capacitor; 10 nF; 10 %; 100 V; X7R; 080
C0805F103K1RACTU
KEMET
D1
diode; zener; 6.8 V; 300 mA
BZX384-C6V8
NXP Semiconductors
D2
diode; 100 V; 250 mA
BAS316
NXP Semiconductors
D3
diode; ultrafast; 600 V; 3 A
ES3J
Fairchild
D4
diode; zener; 12 V; 250 mA
BZX384-C12
NXP Semiconductors
D5
diode; 100 V; 300 mA
1N4148W-7-F
Diode Inc.
D6
diode; 440 V; 600 mA; TVS
SMAJ440A
Littelfuse
D7
diode; rectifier; 600 V; 1 A
S1J
Fairchild
D8
diode; dual; 100 V; 215 mA
BAV99
NXP Semiconductors
F1
fuse; slow-blow; 2 A
SS-5H-2A-APH
Cooper Bussmann
K1; K2
connector; terminal block; 5.00 mm
1715022
Phoenix Contact
L1; L2; L3
inductor; 1.5 mH; 430 mA; 1.7 
ELC11D152F
Panasonic
L4
inductor; 660 H; 1.9 A; EFD20
WE750315291Rev.00
Würth Elektronik
Q1; Q3
MOSFET-N; 600 V; 2.4 A
STD3NK60ZT4
ST Micro
Q2
transistor; NPN; 45 V; 100 mA
BC847C
NXP Semiconductors
Q4
transistor; NPN; 45 V; 100 mA
BC847B
NXP Semiconductors
Q5
transistor; NPN; 400 V; 1 A
BUJ100LR
NXP Semiconductors
R1; R2; R3
resistor; 4.7 k; 5 %; 250 mW; 1206
-
-
R4; R5; R9; resistor; 1 M; 5 %; 250 mW; 1206
R10
-
-
R6
resistor; 22 k; 5 %; 63 mW; 0603
-
-
R7; R8
resistor; 180 k; 5 %; 250 mW; 1206
-
-
UM10873
User manual
-
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Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
22 of 28
UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
Table 3.
SSL5231BDB1288 demo board full BOM …continued
Reference
Description and values
Part number
Manufacturer
R9; R10
resistor; 910 k; 5 %; 250 mW; 1206
-
-
R11
resistor; 27 k; 5 %; 63 mW; 0603
-
-
R12
resistor; 910 k; 5 %; 63 mW; 0603
-
-
R14; R15;
R16; R17;
R18; R19
resistor; 1.8 ; 5 %; 500 mW; 1210
ERJ14YJ1R8U
Panasonic
R20
resistor; 5.1 k; 5 %; 63 mW; 0603
-
-
R21
resistor; 150 k; 5 %; 250 mW; 1206
-
-
R22
resistor; 10 k; 5 %; 250 mW; 1206
-
-
R23
resistor; 82 k; 5 %; 100 mW; 0805
-
-
R24
resistor; 100 ; 5 %; 63 mW; 0603
-
-
R25
resistor; 82 k; 5 %; 250 mW; 1206
-
-
R26; R38
resistor; 750 ; 5 %; 250 mW; 1206
-
-
R27
resistor; 100 ; 5 %; 100 mW; 0805
-
-
R28; R29
resistor; 100 k; 5 %; 250 mW; 1206
-
-
R30; R31;
R32
resistor; 100 ; 5 %; 3 W; THT
MOS3CT631R101J
KOA Speer
R33
resistor; 240 k; 5 %; 250 mW; 1206
-
-
R34
resistor; 270 k; 5 %; 250 mW; 1206
-
-
R35
resistor; 330 k; 5 %; 100 mW; 0805
-
-
R36
resistor; 33 ; 5 %; 2 W; THT
MOS2CT52R330J
KOA Speer
R37
resistor; 3.3 k; 5 %; 63 mW; 0603
-
-
R39; R40
resistor; jumper; 0 ; 63 mW; 0603
-
-
R41
resistor; jumper; 0 ; 250 mW; 1206
-
-
RV1
resistor; VDR; 230 V; 17 J
B72207S0231K101
EPCOS
U1
buck LED driver dimmable; SSL5231BT
SSL5231BT
NXP Semiconductors
WB1
wire bridge; 0.8 mm; P = 5.08 mm
923345-02
3M
UM10873
User manual
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
23 of 28
UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
11. Board layout
Figure 19 shows the SSL5231BDB1288 demo board layout and assembly on both sides.
Inductors L1, L2, and L3 can be mounted either vertically or horizontally.
a. Top view
b. Bottom view
Fig 19. SSL5231BDB1288 demo board assembly
UM10873
User manual
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
12. Inductor specification
GLPHQVLRQPD\EHH[FHHGHGZLWKVROGHURQO\
SDUWPXVWLQVHUWIXOO\WRVXUIDFH$
LQUHFRPPHQGHGJULG‘[
$
GRWORFDWHVWHUP
PD[
PD[
PD[
WHUPQXPEHUV
IRUUHIHUHQFHRQO\
‘[
[
UHFRPPHQGHG
SFSDWWHUQFRPSRQHQWVLGH
'LPHQVLRQVLQPP
DDD
Fig 20. Specification of inductor L4 with EFD20 coil and bobbin
•
•
•
•
•
•
UM10873
User manual
Winding: Pin 1, 4
Self-inductance: L = 660 H
Number of windings: n = 120, Litzwire Cu; diameter: 10 mm  0.1 mm
Saturation current: Isat > 2 A
Working voltage: 230 V (AC)
Insulation voltage: 500 V (AC)
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
25 of 28
UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
13. Abbreviations
Table 4.
Abbreviations
Acronym
Description
EMI
ElectroMagnetic Interference
LE
Leading-Edge
LED
Light-Emitting Diode
MELF
Metal Electrode Leadless Face
MOSFET
Metal-Oxide-Semiconductor Field-Effect Transistor
OCP
OverCurrent Protection
OSP
Output Short Protection
OTP
OverTemperature Protection
OVP
OverVoltage Protection
PF
Power Factor
SMD
Surface-Mounted Devices
SSL
Solid-State Lighting
TE
Trailing-Edge
THD
Total Harmonic Distortion
UVLO
UnderVoltage LockOut
14. Glossary
R1 // R2 — Resistors R1 and R2 in parallel
15. References
UM10873
User manual
[1]
SSL5231BT data sheet — Compact high power factor dimmable LED driver IC
[2]
AN11618 application note — SSL523XT buck-boost controller
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
26 of 28
UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
16. Legal information
16.1 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.
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 competent authorities.
16.2 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. NXP Semiconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
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.
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.
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.
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 and its suppliers accept 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.
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
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.
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.
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.
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.
Safety of high-voltage evaluation products — 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.
The product does not comply with IEC 60950 based national or regional
safety standards. NXP Semiconductors does not accept any liability for
damages incurred due to inappropriate use of this product or related to
non-insulated high voltages. Any use of this product is at customer’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.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
16.3 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
GreenChip — is a trademark of NXP Semiconductors N.V.
UM10873
User manual
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Rev. 1 — 23 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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UM10873
NXP Semiconductors
SSL5231BDB1288 230 V 24 W dimmable buck converter
17. Contents
1
2
3
4
5
6
6.1
6.2
6.2.1
6.2.2
6.3
6.3.1
6.3.2
6.4
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
8
9
9.1
9.2
10
10.1
10.2
11
12
13
14
15
16
16.1
16.2
16.3
17
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety warning . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Board photographs . . . . . . . . . . . . . . . . . . . . . . 5
Board connections . . . . . . . . . . . . . . . . . . . . . . 6
Functional description and options . . . . . . . . . 7
Input filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Open-load protection . . . . . . . . . . . . . . . . . . . . 7
IC not operating . . . . . . . . . . . . . . . . . . . . . . . . 7
IC operating with OVP . . . . . . . . . . . . . . . . . . . 7
LED current and sense resistor . . . . . . . . . . . . 8
Single resistor sensing . . . . . . . . . . . . . . . . . . . 8
Split resistor sensing. . . . . . . . . . . . . . . . . . . . . 9
Output current ripple . . . . . . . . . . . . . . . . . . . . 11
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Factor . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line regulation . . . . . . . . . . . . . . . . . . . . . . . . 13
Load regulation . . . . . . . . . . . . . . . . . . . . . . . . 13
Dim curves . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power losses . . . . . . . . . . . . . . . . . . . . . . . . . 15
ElectroMagnetic Interference (EMI) . . . . . . . . 15
Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SSL5231BDB1288 minimum component count
schematic diagram . . . . . . . . . . . . . . . . . . . . . 18
SSL5231BDB1288 full schematic diagram. . . 19
Bill Of Materials (BOM) . . . . . . . . . . . . . . . . . . 20
SSL5231BDB1288 demo board minimum
component count BOM . . . . . . . . . . . . . . . . . . 20
SSL5231BDB1288 demo board full BOM . . . 22
Board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Inductor specification . . . . . . . . . . . . . . . . . . . 25
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Legal information. . . . . . . . . . . . . . . . . . . . . . . 27
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP Semiconductors N.V. 2015.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 23 April 2015
Document identifier: UM10873
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