1. General description
The SSL21081T is a high-voltage Integrated Circuit (IC) for driving LED lamps in general
mains non-dimmable lighting applications.
The main benefits are:
• Small Printed-Circuit Board (PCB) footprint; compact solution
• High efficiency (up to 95 %)
• Ease of integration
• Low electronic Bill Of Material (BOM)
The IC incorporates a 300 V MOSFET.
The IC works as boundary conduction mode conver
ter
s, typically in buck configuration. It
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 IC provides accurate output current contro
l with LED current accuracy within 5 %. It
can be operated using Pulse-Width Modulation (PWM) current regulation. It 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:
driver with integrated 300 V (D
C) power switches
Controller with power-efficient boundary conduction mode of operation with:
No reverse recovery losses in fre
ewheel 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
No over or undershoots in the LED current
SSL21081T
Compact non-dimmable LED driver IC
Rev. 6 — 3 October 2013 Product data sheet
