SSL1750T/N1,518【PDF 1/29 页】IC LED DRVR HI PWR AC IN 16-SOIC

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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 ?yback

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 ef?ciency 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 ef?ciency. In burst

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

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

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

at low power while minimizing audible noise from the transformer.

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

recti?ed 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 ef?cient 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 ?yback 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)

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