SSL1750 Datasheet, PDF (1/29 Pages) NXP Semiconductors – SMPS control IC for LED drivers

SSL1750
SMPS control IC for LED drivers
Rev. 01 — 15 September 2008
Product data sheet
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
I Integrated PFC and flyback controller
I Universal mains supply operation (70 V to 276 V (AC))
I High level of integration resulting in a very low external component count and a cost
effective design
2.2 Green features
I On-chip start-up current source
2.3 PFC green features
I Valley/zero voltage switching for minimum switching losses (patented)