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Name: SSL21084 for dimmable LED lighting

The SSL2108X is a range of high-voltage Integrated Circuits (ICs), intended to drive LED lamps in general lighting applications.
The main benefits of the product family are:
•Small Printed-Circuit Board (PCB) footprint, and compact solution
•High efficiency (up to 95 %)
•Ease of integration
•Low electronic Bill Of Material (BOM)
The product family is made of ICs with a range of internal HV switches for easy power scaling.
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 functionality 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) dimming and has many protection features including easy LED temperature feedback.

Features and benefits

LED driver IC family driving strings of LEDs from a rectified mains supply
High-efficiency switch mode buck driver product family:
Drivers with integrated 300 V (SSL21081 and SSL21082) or 600 V (SSL21083 and SSL21084) 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 dimming 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
No binning on LED forward voltage required
Internal Protections:
UnderVoltage LockOut (UVLO)
Leading-Edge Blanking (LEB)
OverCurrent Protection (OCP)
Short-Winding Protection (SWP)
Internal OverTemperature Protection (OTP)
Brownout protection
Output Short Protection (OSP)
Low component count (see Figure 4) LED driver solution:
No Schottky diode required due to ZCS
No dim switch and high-side driver required for PWM dimming
Easy external temperature protection with a single NTC resistor
Option for soft-start function
Compatible with wall switches with built-in indication light during standby1
IC lifetime easily matches or surpasses LED lamp lifetime


Specifications: Click to download
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