UM10501
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© NXP B.V. 2011. All rights reserved.
User manual
Rev. 2 — 16 November 2011
3 of 18
NXP Semiconductors
UM10501
SSL21083 reference board user manual
1. Introduction
The SSL21083 is a highly integrated switching mode LED driver which enables constant
current driving from the mains input. It is a solution for small LED retrofit lamp application,
especially for low-power factor design.
The SSL21083 is a buck converter controller suitable for non-isolated, non-dimmable LED
retrofit lamps. It can drive long LED strings with, typically 70 V forward voltage. The
SSL2108 series is intended to operate with higher output voltages, as present in modern
LED modules.
Remark:
Unless otherwise stated all voltages are in V (AC).
2. Safety
warning
This demo board is connected to a high AC voltage. Avoid touching the reference board
during operation. An isolated housing is mandatory when used in uncontrolled,
non-laboratory environments. Galvanic isolation of the mains phase using a fixed or
variable transformer (Variac) is always recommended. These devices are recognized by
the symbols shown in
WARNING
Lethal voltage and fire ignition hazard
The non-insulated high voltages that are present when operating this product, constitute a
risk of electric shock, personal injury, death and/or ignition of fire.
This product is intended for evaluation purposes only. It shall be operated in a designated test
area by personnel qualified according to local requirements and labor laws to work with
non-insulated mains voltages and high-voltage circuits. This product shall never be operated
unattended.
a. Isolated
b. Not isolated
Fig 1.
Variac isolation symbols
019aab173
019aab174