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PDF SSL2109AT Data sheet ( Hoja de datos )
| Número de pieza | SSL2109AT | |
| Descripción | Compact non-dimmable LED driver IC | |
| Fabricantes | NXP Semiconductors | |
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SSL2109AT
Compact non-dimmable LED driver IC
Rev. 5 — 3 October 2013
Product data sheet
1. General description
The SSL2109AT 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 (application dependent)
• Ease of integration and many protection features
• Low electronic Bill Of Material (BOM)
• Highly flexible IC for use in buck, buck/boost and flyback modes
• Single inductor used for non-isolated configurations because of internal
demagnetization detection and dV/dt supply
The IC is supplementary to the SSL21081/SSL21083 series but without an internal switch.
The IC has been designed to start up directly from the HV supply by an internal
high-voltage current source. Thereafter, the dV/dt supply is used with capacitive coupling
from the drain, or any other auxiliary supply. This functionality provides full flexibility in the
application design. An internal clamp limits the supply voltage.
The IC provides accurate output current control to within 5 % LED current accuracy. The
IC can be operated using Pulse-Width Modulation (PWM) current regulation and has
many protection features including easy LED temperature feedback.
2. Features and benefits
LED driver IC for driving strings of LEDs or high-voltage LED modules from a rectified
mains supply
Part of a high-efficiency switch mode flyback or buck product family.
Driver-only which can drive an external MOSFET
Driver that has 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
Suitable for high power factor (>0.9) applications
Applicable in buck, buck/boost and flyback topologies
1 page  
NXP Semiconductors
SSL2109AT
Compact non-dimmable LED driver IC
8. Functional description
8.1 Introduction
The SSL2109AT is a driver for small form factor retrofit SSL lamps and separate LED
drivers.
8.2 Converter operation
The converter in the SSL2109AT is a Boundary Conduction Mode (BCM), peak current
controlled system. Figure 3 shows the basic application diagram. Figure 4 shows 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 (SSL2109AT
controlled) and on the HV bus voltage 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.
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Fig 3. SSL2109AT basic low ripple buck application diagram
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8.3 Driver pin
The SSL2109AT is equipped with an internal driver that can control 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.
At the lowest VCC voltage (VCC(stop)), the voltage of the driver is VO(DRIVER)min.
SSL2109AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
5 of 20
5 Page 
NXP Semiconductors
SSL2109AT
Compact non-dimmable LED driver IC
9. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min
General
SR slew rate
on pin DRAIN
5
Ptot
Tamb
Tj
Tstg
Voltages
total power dissipation
ambient temperature
junction temperature
storage temperature
SO8 package
-
40
40
55
VCC
VDRAIN
VHV
VSOURCE
VNTC
Currents
supply voltage
voltage on pin DRAIN
voltage on pin HV
voltage on pin SOURCE
voltage on pin NTC
continuous
current limited
current limited
current limited
[1] 0.4
0.4
0.4
0.4
0.4
IDD
IDVDT
supply current
current on pin DVDT
at pin VCC
duration 20 s
maximum
[2] -
-
VESD
electrostatic discharge
voltage
human body
model; pins
DRAIN and HV
[3] 1
human body
model; all other
pins
2
charged device
[4] 500
Max
+5
0.6
+125
+150
+150
+20
+600
+600
+5.2
+5.2
20
1.3
+1
+2
+500
Unit
V/ns
W
C
C
C
V
V
V
V
V
mA
A
kV
kV
V
[1] The current flowing into the VCC pin must not exceed the maximum IDD value
[2] An internal clamp sets the supply voltage.
[3] Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor.
[4] 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 characteristics
Table 5. Thermal characteristics
Symbol
Parameter
Conditions
Typ Unit
Rth(j-a)
thermal resistance from junction to in free air; PCB: 2 cm 3 cm; 2-layer; 35 m
ambient
Cu per layer
159
K/W
in free air; PCB: JEDEC 2s2p
89 K/W
j-top
thermal characterization parameter top package temperature measured at the
from junction to top of package
warmest point on top of the case
0.49 K/W
SSL2109AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
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