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1. General description

The SSL21084T is a high-voltage Integrated Circuit (IC) for driving retrofit LED lamps in

general lighting applications. It enables the implementation of a very compact low-cost

system solution. The IC incorporates an integrated internal HV switch and works as

Boundary Conduction Mode (BCM) buck converter.

The SSL21084T is supplied by a start-up bleeder re

sistor, a dV/dt supply using capacitive

coupling from the drain or any other auxiliary supply. The IC supply current is low. An

internal clamp limits the supply voltage.

The IC has accurate output current contro

l and can be operated using Pulse-Width

Modulation (PWM) dimming. In addition, several protection features are available such as

easy external temperature feedback.

The main benefits of this IC include:

• Small Printed-Circuit Board (PCB) footprint and compact solution

• High efficiency (up to 90 %) 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 modes

• Single inductor used for non-isolated configurations because of internal

demagnetization detection and dV/dt supply

The IC range is designed to start up directly from the HV supply using an internal

gh-voltage current source. An internal clamp limits the supply voltage.

SSL21084T

Mains driver LED driver IC

Rev. 6 — 3 October 2013 Product data sheet

Summary of content (22 pages)

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SSL21084T Mains driver LED driver IC Rev. 6 — 3 October 2013 Product data sheet 1. General description The SSL21084T is a high-voltage Integrated Circuit (IC) for driving retrofit LED lamps in general lighting applications. It enables the implementation of a very compact low-cost system solution. The IC incorporates an integrated internal HV switch and works as Boundary Conduction Mode (BCM) buck converter.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 2.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 4. Quick reference data Table 1. Quick reference data Symbol Parameter Conditions [1] Min Typ Max Unit 8 - 16 V 4 5 6  VCC supply voltage operating range RDSon drain-source on-state resistance Tj = 25 C 6 7.5 9  IDRAIN current on pin DRAIN 1 - +1 A VDRAIN voltage on pin DRAIN 0.4 - +600 V fconv conversion frequency - 100 - kHz [1] Tj = 125 C An internal clamp sets the supply voltage.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 6. Block diagram HV VCC 1 4 JFET SUPPLY: INTERNAL REGULATOR AND BANDGAP dV/dT SUPPLY 9 VALLEY DETECTION 12 DVDT DRAIN LOGIC TOFFMAX 8 NTC 5 NTC FUNCTION THERMAL SHUTDOWN TONMOD TONMOD LOGIC CONTROL AND PROTECTION BLANK 3 SOURCE POR 1.5 V GND 2, 6, 7, 10, 11 0.5 V < >0.25 V 001aan694 Fig 1. SSL21084T Product data sheet SSL21084T block diagram All information provided in this document is subject to legal disclaimers.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 7. Pinning information 7.1 Pinning HV 1 12 DRAIN GND 2 11 GND SOURCE 3 VCC 4 9 DVDT NTC 5 8 TONMOD GND 6 7 GND IC 10 GND 001aan703 Fig 2. SSL21084T pin configuration 7.2 Pin description Table 3.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 8. Functional description 8.1 Introduction The SSL21084T 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 SSL21084T is a Boundary Conduction Mode (BCM), peak current controlled system. See Figure 3 for the basic application diagram. See Figure 4 for relevant the waveforms.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 8.3 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.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 8.4 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 Short-winding protection (SWP) LED overtemperature control and protection An optional output OverVoltage Protection circuit is implemented using external components and the NTC pin.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 8.4.5 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 must remain constant. The input current would otherwise increase to a level that is too large for the input circuitry. In the SSL21084T, there is a maximum limit on the on-time of switch ton(high).
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 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 8.4.6 and Table 6). 8.5 VCC supply The SSL21084T can be supplied using three methods: • Under normal operation, the voltage swing on the DVDT pin is internally rectified to provide current on the VCC pin • At start-up, there is an internal current source connected to the HV pin.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 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). Peak current Fig 6.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 8.8 Heat sink In SSL21084T applications, the PCB copper acts as the heat sink. The IC has thermal leads (GND pins 2, 6, 10 and 11) for enhanced heat transfer from die to the PCB copper heat sink. The thermal lead connection can drastically reduce thermal resistance. Equation 1 shows the relationship between the maximum allowable power dissipation and the thermal resistance from junction to ambient.
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SSL21084T NXP Semiconductors Mains 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 Max Unit SR slew rate on pin DRAIN 5 +5 V/ns Ptot total power dissipation SO12 package - 1 W Tamb ambient temperature 40 +125 C Tj junction temperature 40 +150 C Tstg storage temperature 55 +150 C 0.4 +20 V 0.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 10. Thermal characteristics Table 5. Thermal characteristics Symbol Parameter Conditions Typ Unit Rth(j-a) thermal resistance from junction to ambient in free air; PCB: 2 cm 3 cm; 2-layer; 35 m Cu per layer 121 K/W in free air; PCB: JEDEC 2s2p 53 K/W j-top thermal characterization parameter from junction to top of package top package temperature measured at the warmest point on top of the case 3.4 K/W 11.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC Table 6. Characteristics …continued Values specified at Tamb = 25 C unless otherwise specified; all voltages are measured with respect to ground; currents are positive when flowing into the IC. Symbol Parameter Conditions Min Typ Max Unit Current and SWP Vth(ocp)SOURCE overcurrent protection threshold voltage on pin SOURCE V/t = 0.1 V/s 480 500 520 mV V/t = 0.1 V/s; VNTC = 0.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC Table 6. Characteristics …continued Values specified at Tamb = 25 C unless otherwise specified; all voltages are measured with respect to ground; currents are positive when flowing into the IC.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 12. Package outline SO12: plastic small outline package; 12 leads; body width 3.9 mm SOT1196-1 D E A X c HE y v A Z 12 7 A2 A A3 A1 pin 1 index θ Lp 1 L 6 e1 e2 w detail X bp 0 1 2 Dimensions D(1) E(1) max 1.75 0.25 1.45 0.49 0.25 8.75 nom 0.18 1.35 0.25 0.43 0.22 8.65 min 0.10 1.25 0.36 0.10 8.55 4.0 3.9 3.8 Unit mm 3 4 5 mm scale A A1 A2 A3 bp c e1 e2 2.54 1.27 HE L Lp 6.2 6.0 5.8 1.05 1.0 0.7 0.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 13. Abbreviations Table 7.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 15. Revision history Table 8. Revision history Document ID Release date Data sheet status Change notice Supersedes SSL21084T v.6 20131003 Product data sheet - Modifications: • SSL21082_SSL21084 v.5 Text and drawings have been updated throughout the data sheet. SSL21082_SSL21084 v.5 20121214 Product data sheet - SSL2108_SER v.4 SSL2108_SER v.4 20120508 Product data sheet - SSL21081T_2T_3T_4T v.3.1 SSL21081T_2T_3T_4T v.3.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 16. Legal information 16.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. Quick reference data — The Quick reference data is an extract of the product data given in the Limiting values and Characteristics sections of this document, and as such is not complete, exhaustive or legally binding.
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SSL21084T NXP Semiconductors Mains dimmable LED driver IC 18. Contents 1 2 3 4 5 6 7 7.1 7.2 8 8.1 8.2 8.3 8.4 8.4.1 8.4.2 8.4.3 8.4.4 8.4.5 8.4.6 8.4.7 8.4.8 8.5 8.5.1 8.6 8.7 8.7.1 8.8 9 10 11 12 13 14 15 16 16.1 16.2 16.3 16.4 17 18 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Quick reference data . . . . . . . . . . . . . . . . . . . . .