Document
SSL2129AT
Dimmable LED driver IC
Rev. 4 — 3 October 2013
Product data sheet
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)
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
Table 1. Symbol VCC ICC(INT) VHV VDRAIN
Quick reference data Parameter supply voltage internal supply current voltage on pin HV voltage on pin DRAIN
Conditions operating range normal operation
Min Typ 8- 1.3 0.4 0.4 -
Max 16 +600 +600
Unit V mA V V
fconv Vo(DRIVER)max
conversion frequency
maximum output voltage on pin DRIVER
VCC > VCC(startup)
9
100 10.5 12
kHz V
[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 2. Ordering information
Type number Package
Name Description
SSL2129AT SO8
plastic small package outline body; 8 leads; body width 3.9 mm
Version SOT96-1
SSL2129AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
2 of 19
NXP Semiconductors
6. Block diagram
SSL2129AT
Dimmable LED driver IC
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Fig 1. SSL2129AT block diagram
9!9 DDD
SSL2129AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
3 of 19
NXP Semiconductors
7. Pinning information
7.1 Pinning
SSL2129AT
Dimmable LED driver IC
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Fig 2. SSL2129AT pin configuration
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7.2 Pin description
Table 3. Pin description
Symbol
Pin
HV 1
VCC
2
NTC
3
SOURCE
4
DRIVER
5
TONMOD
6
GND
7
DRAIN
8
Description high-voltage supply pin supply voltage temperature protection input low-side external switch driver output on-time modulation input ground high-side external switch
SSL2129AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
4 of 19
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 .