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SSL2129AT
Dimmable LED controller IC
1. General description
The SSL2129AT is a high-voltage Integrated Circuit (IC) for driving LED lamps in general
lighting applications.
The main benefits of this IC include: Small Printed-Circuit Board (PCB) footprint and compact solution High efficiency (up to 95 %) for non-dimmable high power factor solutions High power factor (>0.9) Ease of integration and many protection features Low electronic Bill Of Material (BOM) Mains phase-cut dimmable using external components Highly flexible IC for use in buck, buck/boost and flyback modes Single inductor used for non-isolated configurations because of internal
demagnetization detection
The IC range has been designed to start up directly from the HV supply using an internal
high-voltage current source. An internal clamp limits the supply voltage.
2. Features and benefits LED driver IC for driving strings of LEDs or high-voltage LED modules from a rectified
mains supply Driver provides power-efficient boundary conduction mode of operation with: No reverse recovery losses in freewheel diode Zero-Current Switching (ZCS) for switch turn-on Zero-voltage or valley switching for switch turn-off Minimal required inductance value and size Fast transient response through cycle-by-cycle current control: No over or undershoots in the LED current Simple high input power factor solution (>0.9) Internal Protection features: UnderVoltage LockOut (UVLO) Leading-Edge Blanking (LEB) OverCurrent Protection (OCP) Internal OverTemperature Protection (OTP)
SSL2129AT
Dimmable LED driver IC
Rev. 4 — 3 October 2013 Product data sheet
NXP Semiconductors SSL2129AT
Dimmable LED driver IC Brownout protection Output Short Protection (OSP) Mains phase cut dimmable LED driver solution: Supports both leading and trailing-edge dimmers Easy external temperature protection with a single NTC Open output protection using external components Compatible with wall switches with built-in indication light during standby IC lifetime easily matches or surpasses LED lamp lifetime Input current distributed evenly over the phase, reducing required output capacitor
size and bleeder dissipation
3. Applications
The SSL2129AT is intended for mains dimmable compact LED lamps for single mains
input voltages. Mains input voltages include 100 V, 120 V and 230 V (AC). The external
components determine the power range.
4. Quick reference data
[1] An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum IDD
value (see Table 4).
5. Ordering information
Table 1. Quick reference data
VCC supply voltage operating range 8 - 16 V
ICC(INT) internal supply current normal operation - 1.3 - mA
VHV voltage on pin HV 0.4 - +600 V
VDRAIN voltage on pin DRAIN 0.4 - +600 V
fconv conversion frequency - 100 - kHz
Vo(DRIVER)max maximum output voltage
on pin DRIVER
VCC > VCC(startup) 9 10.5 12 V
Table 2. Ordering information
SSL2129AT SO8 plastic small package outline body; 8 leads; body width 3.9 mm SOT96-1
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
6. Block diagram
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
7. Pinning information
7.1 Pinning
7.2 Pin description
Table 3. Pin description 1 high-voltage supply pin
VCC 2 supply voltage
NTC 3 temperature protection input
SOURCE 4 low-side external switch
DRIVER 5 driver output
TONMOD 6 on-time modulation input
GND 7 ground
DRAIN 8 high-side external switch
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
8. Functional description
8.1 Introduction
The SSL2129AT is a driver IC solution for small form factor mains phase-cut dimmable
LED lamps in isolated and non-isolated applications.
8.2 Converter operation
The converter in the SSL2129AT is a Boundary Conduction Mode (BCM), peak current
controlled system. See Figure 3 for the basic application diagram. See Figure 4 for the
waveforms.
This converter type operates at the boundary between continuous and discontinuous
mode. Energy is stored in inductor L each period that the switch is on. The inductor
current IL is zero when the MOSFET is switched on. The amplitude of the current build-up
in L is proportional to the voltage drop over the inductor and the time that the MOSFET
switch is on. When the MOSFET is switched off, the energy in the inductor is released
towards the output. The current then falls at a rate proportional to the value of VOUT. The
LED current ILED depends on the peak current through the inductor (SSL2129AT
controlled) and on the dimmer angle while it is optimized for a high-power factor. A new
cycle is started once the inductor current IL is zero. This quasi-resonant operation results
in higher efficiency.
8.3 Driver pin
The SSL2129AT is equipped with a driver output for controlling an external switch. The
voltage on the driver output pin is increased towards Vo(DRIVER)max to open the switch
during the first cycle (t0 to t1). The voltage on the driver output pin is pulled down towards
a low level from the start of the secondary stroke until the next cycle starts (t0 to t00).
During transition from low to high and back, there is a controlled switching slope
steepness. This controlled condition limits the high-frequency radiation from the circuit to
the surrounding area. The switching slope can be controlled further using an external
resistor between IC and gate.
At the lowest VCC voltage (VCC(stop)), the voltage of the driver is VO(DRIVER)min.
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
8.4 Valley detection
A new cycle is started when the primary switch is switched on (see Figure 4). In the
following sections, “on” represents the conductive state and off the non-conductive state.
Following time t1, when the peak current is detected on the SOURCE pin, the switch is
turned off and the secondary stroke starts at t2. When the secondary stroke is completed
with the coil current at t3 equaling zero, the drain voltage starts to oscillate at
approximately the VIN  VOUT level. The peak to peak amplitude equals 2  VOUT. In a
tapped buck topology, this amplitude is multiplied by the ratio of the windings.
A special feature, called valley detection is an integrated part of the SSL2129AT circuitry.
Dedicated built-in circuitry connected to the DRAIN pin, senses when the voltage on the
drain of the switch has reached its lowest value. The next cycle is then started at t00 and
as a result the capacitive switching losses are reduced. A valley is detected and accepted
if both the frequency of the oscillations and the voltage swing are within the range
specified (fring and ∆Vvrec(min)) for detection. If a valid valley is not detected, the secondary
stroke is continued until the maximum off-time (toff(high)) is reached. Then the next cycle is
started.
A series resistance can be included at the drain sensing pin for flyback mode to remove
the high-frequency ringing caused by the transformer leakage inductance.
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
8.5 Protective features
The IC has the following protective features: UnderVoltage LockOut (UVLO) Leading-Edge Blanking (LEB) OverCurrent Protection (OCP) Internal OverTemperature Protection (OTP) Brownout protection Output Short Protection (OSP) LED overtemperature control and protection An optional output OverVoltage Protection circuit is implemented using external
components and the NTC pin.
The internal OTP and LED over temperature protections are safe-restart protections. The
IC halts, causing VCC to drop to below VCC(stop), and triggers a start-up. When VCC drops
to below VCC(rst), the IC resets the latch protection mode. Switching starts only when no
fault condition exists.
8.5.1 UnderVoltage LockOut (UVLO)
When the voltage on the VCC pin < VCC(stop), the IC stops switching. An attempt is then
made to restart by supplying VCC from the HV pin voltage.
8.5.2 Leading-Edge Blanking (LEB)
To prevent false detection of the short-winding or overcurrent, a blanking time following
switch-on is implemented. When the MOSFET switch switches on there can be a short
current spike due to capacitive discharge of voltage over the drain and source and the charging of the gate to source capacitance. During the LEB time (tleb), the spike is
disregarded.
8.5.3 OverCurrent Protection (OCP)
The SSL2129AT contains a highly accurate peak current detector. It triggers when the
voltage on the SOURCE pin reaches the peak level Vth(ocp)SOURCE. The current through
the switch is sensed using a resistor connected to the SOURCE pin. The sense circuit is
activated following LEB time tleb. As the LED current is half the peak current (by design), it
automatically provides protection for maximum LED current during operation. There is a
propagation delay (td(ocp-swoff)) between the overcurrent detection and the actual switching
off of the switch. Due to the delay, the actual peak current is slightly higher than the OCP
level set by the resistor in series to the SOURCE pin.
8.5.4 OverTemperature Protection (OTP)
When the internal OTP function is triggered at a certain IC temperature (Tth(act)otp), the
converter stops operating. The OTP safe-restart protection and the IC restarts again with
switching resuming when the IC temperature drops below Tth(rel)otp.
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
8.5.5 Brownout protection
Brownout protection is designed to limit the lamp power when the input voltage drops
close to the output voltage level. The input power has to remain constant. The input
current would otherwise increase to a level that is too high for the input circuitry. In the
SSL2129AT, there is a maximum limit on the on-time of switch ton(high).
In buck mode, the rate of current rise in the coil during the on-phase is proportional to the
difference between input voltage and output voltage. Therefore, the peak current cannot
be reached before ton(high) and as a result the average output current to the LEDs is
reduced.
8.6 ton control
The ton(high) can be lowered by connecting a capacitor to the TONMOD pin. The external
capacitor is charged during the primary stroke with Ioffset(TONMOD). If the Vth(TONMOD) level
is reached before the ton(high) time, the switch is turned off and the secondary stroke starts.
When a capacitor is not connected to the pin, Vth(TONMOD) is reached quickly. Shorter than
the minimum limit of 1 s. In this case or when the TONMOD pin is grounded, the internal
time constant, ton(high) determines the maximum on-time.
8.7 Output Short-circuit Protection (OSP)
During the secondary stroke (switch-off time), if a valley is not detected within the off-time
limit (toff(high)), then typically the output voltage is less than the minimum limit allowed in
the application. This condition can occur either during start-up or due to a short-circuit. A
timer tdet(sc) is started when toff(high) is detected. Timer tdet(sc) is reset when a valid valley
detection occurs in one of the subsequent cycles or when VCC drops to below VCC(stop).
The timer can also be reset if the maximum limit on the on-time of the switch (ton(high)) is
reached, which is usually the case at start-up (brownout protection). If no valley is
detected and (ton(high)) is not reached before tdet(sc), then it is concluded that a real
short-circuit exists. The IC enters latched protection. If VCC drops to below VCC(rst), the IC
resets the latched protection mode (see Figure 5). During PWM dimming, the OSP timer
is paused during the off cycle.
The value of ton(high) depends on the capacitor connected to the TONMOD pin. An open or
shorted TONMOD pin sets ton(high) to 15 s (see Section 8.6 and Table 6).
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
8.8 VCC supply
The SSL2129AT can be supplied using three methods: Under normal operation, the voltage swing on the DRAIN pin is rectified using
external components providing current towards the VCC pin At start-up, there is an internal current source connected to the HV pin. The current
source provides internal power until an external current on the VCC pin provides the
supply. Using an auxiliary winding, the voltage can be rectified and connected to the VCC pin
via a series resistor.
The IC starts up when the voltage at the VCC pin exceeds VCC(startup). The IC locks out
(stops switching) when the voltage at the VCC pin is lower than VCC(stop). The hysteresis
between the start and stop levels allows the IC to be supplied by a buffer capacitor until
the external supply is settled. The SSL2129AT has an internal VCC clamp, which is an
internal active Zener (or shunt regulator). This internal active Zener limits the voltage on
the supply VCC pin to the maximum value of VCC. If the maximum current of the supply
minus the current consumption of the IC (determined by the load on the gate drivers), is
lower than the maximum value of IDD no external Zener diode is needed in the supply
circuit.
8.8.1 VCC regulator
During supply dips, the input voltage can drop too low to supply the required IC current.
Under these conditions, if the VCC voltage drops lower than VCC(swon)reg level, a second
regulator is started. Its function is to fill in the required supply current which the external
supply does not deliver. It prevents the IC going into UVLO. When the VCC voltage
exceeds VCC(swon)reg level, the regulator is turned off.
8.9 NTC functionality and PWM dimming
The NTC pin can be used as a control method for LED thermal protection. Alternatively,
the pin can be used as an input to disable/enable light output using a digital signal (PWM
dimming). The pin has an internal current source that generates the current of Ioffset(NTC).
An NTC resistor to monitor the LED temperature can be directly connected to the NTC
pin. Depending on the resistance value and the corresponding voltage on the NTC pin,
the converter reacts as shown in Figure 6.
During start-up, before VCC reaches VCC(startup) the voltage on the NTC pin must be less
than the minimum value of Vact(tmr)NTC. This is valid when the voltage on the NTC pin is
derived from the VCC using a resistive divider and a PTC in series with the resistor
between pins VCC and NTC.
If an NTC resistor is connected between the NTC pin and ground, the voltage on the NTC
pin is 0 V when VCC reaches VCC(startup).
NXP Semiconductors SSL2129AT
Dimmable LED driver IC
When the voltage on the NTC pin exceeds Vth(high)NTC (see Figure 6 (4)), the converter
delivers nominal output current. When the voltage is lower than this level, the peak current
is gradually reduced until Vth(low)NTC is reached (see Figure 6 (3)). The peak current is
now half the peak current of nominal operation. When Vact(tmr)NTC is passed (see Figure 6
(2)) a timer starts to run to distinguish between the following situations: If the low-level Vdeact(tmr)NTC is not reached within time tto(deact)NTC (see Figure 6 (1))
LED overtemperature is detected. The IC stops switching and attempts to restart from
the HV pin voltage. The converter restarts from an NTC protection shutdown when the
voltage on the NTC pin exceeds Vth(high)NTC (see Figure 6 (4)). It is assumed that the
reduction in peak current does not result in a lower NTC temperature and LED OTP is
activated. If the low-level Vdeact(tmr)NTC is reached within the time tto(deact)NTC (see Figure 6 (1)) it
is assumed that the pin is pulled down externally. The restart function is not triggered.
Instead, the output current is reduced to zero. PWM dimming can be implemented this
way. The output current rises again when the voltage is higher than Vth(low)NTC.
8.9.1 Soft-start function
The NTC pin can be used to make a soft start function. During switch-on, the level on the
NTC pin is low. By connecting a capacitor (in parallel with the NTC resistor), a time
constant can be defined. The time constant causes the level on the NTC pin to increase
slowly. When passing level Vth(low)NTC (see Figure 6 (3)), the convertor starts with half of
the maximum current. The output current slowly increases to maximum when Vth(high)NTC
(see Figure 6 (4)) is reached.

Partno	Mfg	Dc	Qty	Available	Descript
SSL2129AT	NXP	N/a	1371	avai	Dimmable LED controller IC