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SSL2102T
Dimmable LED driver IC
1. General descriptionThe 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 10W
SSL2102: fully integrated LED driver for lamps up to 25W
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 VCC 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 25W SSL retro-fit lamps (for example: GU10, E27) LED modules such as LED spots and down-lights LED strings suitable for retail displays, etc.
SSL2102
Dimmable Greenchip driver for LED lighting
Rev. 1.1 — 2 December 2011 Product data sheet
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
4. Quick reference data
5. Ordering information
Table 1. Quick reference dataRDSon drain-source on-state
resistance
power switch; ISOURCE= 0.50A =25C 4.5 6.5 7.5
ISOURCE= 0.20A =125 C- 9.5 10
VCC supply voltage 8.5 - 40 V
fosc oscillator frequency 10 100 200 kHz
IDRAIN current on pin DRAIN VDRAIN >60V; auxiliary supply 2.2 mA
VDRAIN >60V;
with auxiliary supply 30 125 A
VDRAIN voltage on pin DRAIN 40 - 600 V
min minimum duty factor - 0 - %
max maximum duty cycle - 75 - %
Tamb ambient temperature 40- +100 C
Table 2. Ordering informationSSL2102T SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
6. Block diagramNXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
7. Pinning information
7.1 Pinning
7.2 Pin description
Table 3. Pin descriptionSBLEED 1 drain of internal strong bleeder switch
GND 2 ground
GND 3 ground
WBLEED 4 drain of internal weak bleeder switch
VCC 5 supply voltage
GND 6 ground
GND 7 ground
BRIGHTNESS 8 brightness input
RC2 9 setting for frequency reduction 10 frequency setting
PWMLIMIT 11 PWM limit input
ISENSE 12 current sense input for WBLEED
AUX 13 Input for voltage from auxiliary winding for timing
(demagnetization)
GND 14 ground
SOURCE 15 source of internal power switch
GND 16 ground
GND 17 ground
GND 18 ground
GND 19 ground
DRAIN 20 drain of internal power switch; input for start-up current and valley
sensing
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
8. Functional descriptionThe 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 VCC passes the VCC(startup) level. The supply can be taken over
by the auxiliary winding of the transformer as soon as VCC 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 VCC 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 VCC drops below the VCC(UVLO) level, the IC
stops switching and will restart from the rectified mains voltage, if the internal current
delivered is sufficient.
8.2 OscillatorAn 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 VRC(max) level and, starting
from a new primary stroke, it discharges to the VRC(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 VBRIGHTNESS is high can be estimated using Equation1:
(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.
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting A typical RC waveform is given in Figure 4. The RC switch-over threshold is controlled by
the BRIGHTNESS pin. o ensure that the capacitor can be charged within the charge time, the value of the
oscillator capacitor should be limited to 1 nF. Leakage current limits the value of the
resistor connected between the RC pin and the ground should be limited to a maximum of
220 k.
8.3 Duty factor controlThe duty factor is controlled by an internally regulated voltage and the oscillator signal on
pin RC. The internal regulation voltage is set by the voltage on the PWMLIMIT pin.
A low PWMLIMIT voltage will results in a low on-time for the internal power switch. The
minimum duty factor of the switched mode power supply can be set to 0 %. The maximum
duty factor is set to 75 %.
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
8.4 Bleeder for dimming applicationsThe SSL2102 IC contains some circuitry intended for mains dimmer compatibility. This
circuit contains two current sinks that are called bleeders. A strong bleeder is used for
zero-cross reset of the dimmer and TRIAC latching. A weak bleeder is added to maintain
the hold current through the dimmer.
The strong bleeder switch is switched on when the maximum voltage on the WBLEED pin
and the SBLEED pin is below the Vth(SBLEED) level (52 V typically). The weak bleeder
switch is switched on as soon as the voltage on pin ISENSE exceeds the Vth(high)(ISENSE)
level (100 mV typically). The weak bleeder switch is switched off when the ISENSE
voltage drops below the Vth(low)(ISENSE) level (250 mV typically). The weak bleeder switch
is also switched off when the strong bleeder switch is switched on. See Figure5.
8.5 Valley switchingA new cycle is started when the primary switch is switched on (see Figure 6). After a time
determined by the oscillator voltage, RC and the internal regulation level, the switch is
turned off and the secondary stroke starts. The internal regulation level is determined by
the voltage on pin PWMLIMIT.
After the secondary stroke, the drain voltage shows an oscillation with a frequency of
approximately:
(2)
Where:
Lp = primary self inductance
Cp = parasitic capacitance on drain node
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting As soon as the oscillator voltage is high again and the secondary stroke has ended, the
circuit waits for a low drain voltage before starting a new primary stroke.
Figure 6 shows the drain voltage together with the valley signal, the signal indicating the
secondary stroke and the RC voltage.
The primary stroke starts some time before the actual valley at low ringing frequencies,
and some time after the actual valley at high ringing frequencies.
Figure 7 shows a typical curve for a reflected output voltage N at an output voltage of V. This voltage is the output voltage transferred to the primary side of the transformer
with the factor N (determined by the turns ratio of the transformer). It shows that the
system switches exactly at minimum drain voltage for ringing frequencies of 480 kHz, thus
reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started
at 33 before the valley. The switch-on losses are still reduced significantly.
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
8.6 DemagnetizationThe system operates in discontinuous conduction mode if the AUX pin is connected. As
long as the secondary stroke has not ended, the oscillator will not start a new primary
stroke. During the first tsup(xfmr_ring) seconds, demagnetization recognition is suppressed.
This suppression may be necessary in applications where the transformer has a large
leakage inductance and at low output voltages.
8.7 Overcurrent protectionThe cycle-by-cycle peak drain current limit circuit uses the external source resistor
RSENSE1 to measure the current. The circuit is activated after the leading edge blanking
time tleb. The protection circuit limits the source voltage over the RSENSE resistor to
Vth(ocp)SOURCE and thus limits the primary peak current.
8.8 Short-winding protectionThe short-winding protection circuit is also activated after the leading edge blanking time.
If the source voltage exceeds the short-winding protection threshold voltage
Vth(swp)SOURCE, the IC stops switching. Only a power-on reset will restart normal operation.
The short-winding protection also protects in case of a secondary diode short circuit.
8.9 Overtemperature protectionAccurate temperature protection is provided in the device. When the junction temperature
exceeds the thermal shut-down temperature, the IC stops switching. During thermal
protection, the IC current is lowered to the start-up current. The IC continues normal
operation as soon as the overtemperature situation has disappeared. RSENSE is the resistor between the SOURCE pin and GND
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting
9. Limiting values Table 4. Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured
with respect to ground; positive currents flow into the device; pins VCC and RC cannot be current
driven. Pins ISENSE and AUX cannot be voltage driven.
VoltagesVCC supply voltage continuous 0.4 +40 V
VRC voltage on pin RC 0.4 +3 V
VRC2 voltage on pin RC2 0.4 +3 V
VBRIGHTNESS voltage on pin BRIGHTNESS 0.4 +5 V
VPWMLIMIT voltage on pin PWMLIMIT 0.4 +5 V
VSOURCE voltage on pin SOURCE 0.4 +5 V
VDRAIN voltage on pin DRAIN DMOS power
transistor;
Tamb =25C
0.4 +600 V
VSBLEED voltage on pin SBLEED off-state; = 125C 0.4 +600 V
on-state;
VVCC >8.5V; < 125C
0.4 +16 V
VWBLEED voltage on pin WBLEED off-state; < 125C 0.4 +600 V
on-state;
VVCC >8.5V; < 125C
0.4 +12 V
CurrentsIISENSE current on pin ISENSE 20 +5 mA
IAUX current on pin AUX 10 +5 mA
ISOURCE current on pin SOURCE 2+2 A
IDRAIN current on pin DRAIN 2+2 A
GeneralPtot total power dissipation Tamb =70 C- 1.6 W
Tstg storage temperature 55 +150 C
Tamb ambient temperature 40 +100 C junction temperature 40 +150 C
NXP Semiconductors SSL2102
Dimmable Greenchip driver for LED lighting [1] Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor.
[2] Machine model: equivalent to discharging a 200 pF capacitor through a 0.75 H coil and a 10 series
resistor.
[3] Charged device model: equivalent to charging the IC up to 1 kV and the subsequent discharging of each
pin down to 0 V over a 1 resistor.
10. Thermal characteristicsThe heat sink for SSL2102 applications is provided by the Printed-Circuit Board (PCB)
copper. The SSL2102 uses thermal leads (pins 2, 3, 6, 7,16, 17, 18 and 19) for heat
transfer from the die to PCB.
Enhanced thermal lead connection may drastically reduce thermal resistance.
The following equation shows the relationship between the maximum allowable power
dissipation P and the thermal resistance from junction to ambient.
Where:
Rth(j-a) = thermal resistance from junction to ambient
Tj(max) = maximum junction temperature
Tamb = ambient temperature
P = power dissipation
The thermal resistance as a function of the PCB area (Board: 0.8 mm thickness, 2 layers,
Bottom Cu coverage 90 %, Cu thickness 70 m
(390 W/mK), Core material conductivity: 0.5 W/mK, 10 vias dia 0.3 mm) is shown in
Figure8
VESD electrostatic discharge voltage human body
model;
[1]
Pins 20,1,4 1000 +1000 V
All other pins 2000 +2000 V
machine model [2] 200 +200 V
charged device
model
[3] 500 +500 V
Table 4. Limiting values …continuedIn accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured
with respect to ground; positive currents flow into the device; pins VCC and RC cannot be current
driven. Pins ISENSE and AUX cannot be voltage driven.
