1.

General description

The SSL1750 is a Switched Mode Power Supply (SMPS) controller IC, suitable for driving

LED applications from 25 W up to 250 W. For LED power requirements below 25 W the

SSL152x family and SSL1623PH are the best choice.

The SSL1750 combines a controller for Power Factor Correction (PFC) and a flyback

controller. Its high level of integration allows the design of a cost-effective LED power

supply with a very low number of external components.

The special built-in green functions provide high efficiency at all power levels. This applies

to quasi-resonant operation at high power levels, quasi-resonant operation with valley

skipping, as well as to reduced frequency operation at lower power levels. At low power

levels, the PFC switches over to burst mode control to maintain high efficiency. In burst

mode, soft-start and soft-stop functions are added to eliminate audible noise.

During low power conditions, the flyback controller switches to frequency reduction mode

and limits the peak current to 25 % of its maximum value. This will ensure high efficiency

at low power while minimizing audible noise from the transformer.

The proprietary high voltage BCD800 process makes direct start-up possible from the

rectified universal mains voltage in an effective and green way. A second low voltage

Silicon On Insulator (SOI) IC is used for accurate, high speed protection functions and

control.

The SSL1750 enables highly efficient and reliable LED drivers with power requirements of

up to 250 W to be designed easily and with the minimum number of external components.

2.

Features

2.1 Distinctive features

effective design

2.2 Green features

2.3 PFC green features

SSL1750

SMPS control IC for LED drivers

Rev. 01 — 15 September 2008

Product data sheet