Compact non-dimmable LED driver IC
Rev. 5 — 11 October 2012
Product data sheet
1. General description
The SSL21081/SSL21083 are a range of high-voltage Integrated Circuits (ICs) for driving
LED lamps in general mains non-dimmable lighting applications.
The main benefits of these products are:
• Small Printed-Circuit Board (PCB) footprint, and compact solution
• High efficiency (up to 95 %)
• Ease of integration
• Low electronic Bill Of Material (BOM)
These ICs incorporate a 300 V or 600 V MOSFET.
The ICs work as boundary conduction mode converters, typically in buck configuration.
The IC range 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 function provides full flexibility in the
application design. The IC consumes 1.3 mA of supply current with an internal clamp
limiting the supply voltage.
The ICs provide accurate output current control with LED current accuracy within 5 %.
The ICs 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 ICs for driving LED strings from a rectified mains supply
High-efficiency switch mode buck driver product family:
SSL21081AT/SSL21081T: drivers with integrated 300 V (DC) power switches
SSL21083AT/SSL21083T: drivers with integrated 600 V (DC) power switches
Controller with power-efficient boundary conduction mode of operation with:
No reverse recovery losses in freewheel diode
Zero Current Switching (ZCS) for turn-on of switch
Zero voltage or valley switching for turn-on of switch
Minimal required inductance value and size
Direct PWM current regulation possible
Fast transient response through cycle-by-cycle current control:
Negligible AC mains ripple at LED current and minimal total capacitor value