SSL2102
Dimmable Greenchip driver for LED lighting
Rev. 1.1 — 2 December 2011
Product data sheet
1. General description
The SSL2102 is a Switched Mode Power Supply (SMPS) driver IC that operates in
combination with a phase cut dimmer directly from rectified mains. It is designed to drive
LED devices. The device includes a high-voltage power switch, a circuit to allow direct
start-up from the rectified mains voltage and a high-voltage circuitry to supply the phase
cut dimmer.
For dimmer applications, an integrated dedicated circuitry optimizes the dimming curve.
•
SSL2101: fully integrated LED driver for lamps up to 10 W
•
SSL2102: fully integrated LED driver for lamps up to 25 W
•
SSL2103: gives the application designer flexibility to:
–
Use an external power switch to allow the IC to provide any power
–
Use external bleeder transistors to provide extended dimmer interoperability
2. Features and benefits
Easy migration to existing lighting control infrastructure
Supports most available dimming solutions
Optimized efficiency with valley switching managed by a built-in circuitry
Demagnetization detection
OverTemperature Protection (OTP)
Short-Winding Protection (SWP) and Over Current Protection (OCP)
Internal V
CC
generation allowing start-up from the rectified mains voltage
Natural dimming curve by logarithmic correction, down to 1 %
Limited external components required because of the high integration level
Thermal enhanced SO20 wide body package
Suitable for flyback and buck applications
3. Applications
SSL applications below 25 W
SSL retro-fit lamps (for example: GU10, E27)
LED modules such as LED spots and down-lights
LED strings suitable for retail displays, etc.
NXP Semiconductors
SSL2102
Dimmable Greenchip driver for LED lighting
4. Quick reference data
Table 1.
Symbol
R
DSon
Quick reference data
Parameter
drain-source on-state
resistance
Conditions
T
j
= 25
C
I
SOURCE
=
0.20
A
T
j
= 125
C
V
CC
f
osc
I
DRAIN
supply voltage
oscillator frequency
current on pin DRAIN
V
DRAIN
> 60 V;
no auxiliary supply
V
DRAIN
> 60 V;
with auxiliary supply
V
DRAIN
min
max
T
amb
voltage on pin DRAIN
minimum duty factor
maximum duty cycle
ambient temperature
-
8.5
10
-
-
40
-
-
40
9.5
-
100
-
30
-
0
75
-
10
40
200
2.2
125
600
-
-
+100
V
kHz
mA
A
V
%
%
C
Min
4.5
Typ
6.5
Max
7.5
Unit
power switch; I
SOURCE
=
0.50
A
5. Ordering information
Table 2.
Ordering information
Package
Name
SSL2102T
SO20
Description
plastic small outline package; 20 leads; body width 7.5 mm
Version
SOT163-1
Type number
SSL2102
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1.1 — 2 December 2011
2 of 22
NXP Semiconductors
SSL2102
Dimmable Greenchip driver for LED lighting
6. Block diagram
ISENSE
SB_DRV
WB_DRV
12
1
4
BLEEDER
V
CC
5
SUPPLY
VALLEY
20
DRAIN
13
2, 3, 6, 7, 14,
16, 17, 18, 19
LOGIC
100 mV
AUX
GND
Stop
RC
10
OSCILLATOR
15
Low freq
THERMAL
SHUTDOWN
POWER - UP
RESET
FRC
PROTECTION
LOGIC
Blank
SOURCE
BRIGHTNESS
RC2
8
9
0.5 V
Overcurrent
PWMLIMIT
11
PWM
LIMIT
CIRCUIT
Short-winding protection
1.5 V
014aaa810
Fig 1.
Block diagram
SSL2102
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1.1 — 2 December 2011
3 of 22
NXP Semiconductors
SSL2102
Dimmable Greenchip driver for LED lighting
7. Pinning information
7.1 Pinning
SBLEED
GND
GND
WBLEED
V
CC
GND
GND
BRIGHTNESS
RC2
1
2
3
4
5
6
7
8
9
20 DRAIN
19 GND
18 GND
17 GND
16 GND
15 SOURCE
14 GND
13 AUX
12 ISENSE
11 PWMLIMIT
014aaa807
SSL2102
RC 10
Fig 2.
Pin configuration SO20
7.2 Pin description
Table 3.
Symbol
SBLEED
GND
GND
WBLEED
V
CC
GND
GND
BRIGHTNESS
RC2
RC
PWMLIMIT
ISENSE
AUX
GND
SOURCE
GND
GND
GND
GND
DRAIN
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Description
drain of internal strong bleeder switch
ground
ground
drain of internal weak bleeder switch
supply voltage
ground
ground
brightness input
setting for frequency reduction
frequency setting
PWM limit input
current sense input for WBLEED
Input for voltage from auxiliary winding for timing
(demagnetization)
ground
source of internal power switch
ground
ground
ground
ground
drain of internal power switch; input for start-up current and valley
sensing
SSL2102
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1.1 — 2 December 2011
4 of 22
NXP Semiconductors
SSL2102
Dimmable Greenchip driver for LED lighting
8. Functional description
The SSL2102 is an LED driver IC that operates directly from the rectified mains.
The SSL2102 uses on-time mode control and frequency control to control the LED
brightness. The BRIGHTNESS and PWMLIMIT input of the IC can be used to control the
LED light output in combination with an external dimmer. The PWMLIMIT input can also
be used for Thermal Lumen Management (TLM) and for precision LED current control.
8.1 Start-up and UnderVoltage LockOut (UVLO)
Initially, the IC is self-supplying from the rectified mains voltage. The IC starts switching as
soon as the voltage on pin V
CC
passes the V
CC(startup)
level. The supply can be taken over
by the auxiliary winding of the transformer as soon as V
CC
is high enough and the supply
from the line is stopped for high efficiency operation. Alternatively the IC can be supplied
via a bleeder resistor connected to a high voltage.
Remark:
The maximum V
CC
voltage rating of the IC.
If for some reason the auxiliary supply is not sufficient, the high-voltage supply can also
supply the IC. As soon as the voltage on pin V
CC
drops below the V
CC(UVLO)
level, the IC
stops switching and will restart from the rectified mains voltage, if the internal current
delivered is sufficient.
8.2 Oscillator
An internal oscillator inside the IC provides the timing for the switching converter logics.
The frequency of the oscillator is set by the external resistors and the capacitor on pin RC
and pin RC2. The external capacitor is charged rapidly to the V
RC(max)
level and, starting
from a new primary stroke, it discharges to the V
RC(min)
level. Because the discharge is
exponential, the relative sensitivity of the duty factor to the regulation voltage at low duty
factor is almost equal to the sensitivity at high duty factors. This results in a more constant
gain over the duty factor range compared to Pulse Width Modulated (PWM) systems with
a linear sawtooth oscillator. Stable operation at low duty factors is easily realized. The
frequency of the converter when V
BRIGHTNESS
is high can be estimated using
Equation 1:
1
1
-
-
RC
=
------
-------
–
t
ch arg e
f
osc
3.5
(1)
R equals the parallel resistance of both oscillator resistors. C is the capacitor connected at
the RC pin (pin 8).
The BRIGHTNESS input controls the frequency reduction mode.
Figure 3
shows that the
oscillator switches over from an RC curve with R1//R2 to R1 only. A low BRIGHTNESS
voltage will reduce the switching frequency.
SSL2102
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1.1 — 2 December 2011
5 of 22
Industrial Control Electronics
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