SSL2110XT
SSL2110XT switched mode power supply controller IC
Rev. 1 — 4 July 2011
Objective data sheet
1. General description
The SSL2110XT is a Switched Mode Power Supply (SMPS) controller IC that operates
directly from the rectified mains. It is designed to drive LED devices. The device includes
a high-voltage power switch and a circuit enabling start-up directly from the rectified mains
voltage. It has accurate control of the output current. The SSL21101T and SSL21105T are
part of the SSL2110XT product family.
2. Features and benefits
Isolated AC/DC offline non-dimmable LED driver from 100 V (AC) to 230 V (AC)
Primary side sensing (no optocoupler required)
True current source behavior:
LED current independent of mains voltage, LED voltage, temperature and coil
variation
High LED current accuracy (3 % typical)
Efficiency 80 % to 88 % depending on the flyback application
Smart Digital Control (SDC) to deal with two kinds of applications:
High Power Factor (> 0.95) and low Total Harmonic Distortion (THD) (< 30 %)
Low form factor (low LED current ripple with small electrolytic capacitors) -
compatible with exception clause IEC1000-3-2
Protections:
Short winding protection
Internal OverTemperature Protection (OTP)
LED short protection
LED open protection
UnderVoltage LockOut (UVLO)
External (Negative Temperature Coefficient (NTC)) overtemperature detection for LED
current regulation
Internal supply voltage generation enabling start-up from the rectified mains voltage
S014 package
3. Applications
The SSL2110XT is suitable for different power requirements, depending on selected
type:
SSL, retrofit lamps (e.g. GU10, 3 W to 11 W)
LED modules, mains AC/DC converter (e.g. LED spots, down-lights, 11 W to 15 W)
LED strings (e.g. retail display, 4 W to 15 W)
NXP Semiconductors
SSL2110XT
SSL2110XT switched mode power supply controller IC
4. Quick reference data
Table 1.
Symbol
R
DSon
Quick reference data
Parameter
drain-source on-state resistance
Conditions
SSL21101T:
700 V version;
T
j
= 25
C
700 V version;
T
j
= 125
C
SSL21105T:
450 V version;
T
j
= 25
C
450 V version;
T
j
= 125
C
V
CC
f
sw(fb)max
supply voltage
maximum flyback switching
frequency
functional
main = 50 Hz;
mode = 50 kHz
main = 60 Hz;
mode = 50 kHz
main = 50 Hz;
mode = 100 kHz
main = 60 Hz;
mode = 100 kHz
I
DRAIN
current on pin DRAIN
SSL21101T:
700 V version
SSL21105T:
450 V version
V
DRAIN
voltage on pin DRAIN
SSL21101T:
700 V version;
230 V mains
SSL21105T:
450 V version;
120 V mains
T
amb
[1]
[1]
Min
Typ
6.5
Max
Unit
-
9.5
-
-
-
13
-
-
-
-
3
4.2
20
50
60
100
120
-
-
24
-
-
-
-
V
kHz
kHz
kHz
kHz
[1]
[1]
[1]
0
0
0.4
-
-
-
0.8
0.8
+700
A
A
V
0.4
40
-
-
+450
+100
V
C
ambient temperature
For a given V
I(ILEDREF)
and V
NTC
> 1.25 V. See
Table 5.
5. Ordering information
Table 2.
Ordering information
Package
Name
SSL21101T/1
SSL21105T/1
SO14
SO14
Description
plastic small outline package; 14 leads; body width 3.9 mm
plastic small outline package; 14 leads; body width 3.9 mm
Version
SOT108-1
SOT108-1
Type number
SSL2110XT
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Objective data sheet
Rev. 1 — 4 July 2011
2 of 19
NXP Semiconductors
SSL2110XT
SSL2110XT switched mode power supply controller IC
6. Block diagram
V
DD(INTREGD)
V
CC
LDO
JFET
DRAIN
RMAIN
DIGITAL
PLL
100 Hz/
120 Hz
DVDT
t
off
SSL2110XT
f
sw(max)
MODE
FS
CONTROL
f
sw
(λ, α)
DIGITAL
CONTROL
DRIVER
NTC
ILEDREF
001aao153
RSENSE
GND
Fig 1.
Block diagram
7. Pinning information
7.1 Pinning
V
CC
RMAIN
GND
V
DD(INTREGD)
MODE
NTC
ILEDREF
1
2
3
4
5
6
7
001aao154
14 DRAIN
13 GND
12 GND
SSL2110XT
11 GND
10 RSENSE
9
8
n.c.
GND
Fig 2.
Pin configuration
SSL2110XT
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Objective data sheet
Rev. 1 — 4 July 2011
3 of 19
NXP Semiconductors
SSL2110XT
SSL2110XT switched mode power supply controller IC
7.2 Pin description
Table 3.
Symbol
V
CC
RMAIN
GND
V
DD(INTREGD)
MODE
NTC
ILEDREF
GND
n.c.
RSENSE
GND
GND
GND
DRAIN
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
analog supply
current source proportionally equivalent of V
main
ground
regulated supply
power factor/THD and maximum switching frequency control input
temperature protection input
LED current control input
ground
not connected
source of internal power switch
ground
ground
ground
drain of internal power transistor
8. Functional description
The SSL2110XT is an integrated circuit intended for retrofit small form factor SSL lamps. It
provides a controller with an internal high-voltage switch to drive LEDs. It operates directly
from the rectified mains.
8.1 True current source behavior
The LED current (I
LED
) of a flyback converter can be calculated with
Equation 1:
t
off
1
-
-
I
LED
=
--
N
I
pk
------
t
sw
2
Where:
(1)
•
•
•
•
N is the turn ratio of the transformer
I
pk
is the peak current
t
off
is the turn-off time
t
sw
is the switching time
The LED current is related to pin ILEDREF. This can be calculated with
Equation 2:
V
I
ILEDREF
1
1
-
-
-
I
LED
=
--
N
--------------------
----------------------------------
2
R
RSENSE
V
DD
INTREGD
(2)
SSL2110XT
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Objective data sheet
Rev. 1 — 4 July 2011
4 of 19
NXP Semiconductors
SSL2110XT
SSL2110XT switched mode power supply controller IC
Where:
•
V
I(ILEDREF)
is the voltage defined at the input of pin ILEDREF
•
V
DD(INTREGD)
is the internal regulated voltage
•
R
RSENSE
is the resistor connected to pin RSENSE of the power MOS transistor
The true current source behavior and the LED current accuracy are achieved using an
internal digital control, which compares the ILEDREF pin reference with the measurement
of the average LED current over a half-main cycle. The primary peak current (I
pk
) is
adjusted at each half-main cycle in order to achieve the expected LED current.
The expected primary peak current value on the application can be calculated with
Equation 3:
V
th
det
RSENSE
-
I
pk
=
----------------------------------
R
RSENSE
Where:
(3)
•
V
th(det)RSENSE
is the detection threshold voltage on pin RSENSE
•
R
RSENSE
is the resistor connected to pin RSENSE of the power MOS transistor
An internal Leading Edge Blanking (LEB) is implemented to avoid wrong detection of the
primary peak current.
A dvdt detector block is used on pin DRAIN to detect the end of demagnetization and
valleys accurately. A valley switching concept is used for efficiency purposes.
The application is designed to provide a typical turn-off time (t
off
) of 6
s
for a switching
frequency of 100 kHz.
Pin RMAIN senses the mains voltage (V
main
in
Equation 4)
in real time and transforms it to
mains current (I
main
in
Equation 4):
V
main
-
I
main
=
------------------
R
RMAIN
Table 4.
Mains resistance/mains current dependency
Mains resistance
1 M
470 k
Mains current
300
A
300
A
(4)
Mains voltage
220 V/230 V
100 V/120 V
8.2 Modulation type versus MODE pin input
Pin MODE enables the control of both the THD/LED ripple and the switching frequency
operation mode. This input has a range of 0 V to 5 V, which makes it possible to select a
low THD mode (C
i
= 200 nF for an 8 W application) or a low ripple mode (C
i
= 2.2
F
for
an 8 W application) and a maximum switching frequency (50 kHz or 60 kHz or
100 kHz or 120 kHz), depending on the mains frequency (50 Hz or 60 Hz).
SSL2110XT
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Objective data sheet
Rev. 1 — 4 July 2011
5 of 19
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