Applications
• LED bulbs, down lights, luminaires, ballasts and T8 tubes
Description
The LYTSwitch™-2 family of ICs dramatically simplifies low power CC
LED drivers by eliminating the optocoupler and secondary control
circuitry. The family introduces a revolutionary control technique which
provides accurate output current regulation, compensating for
transformer and external component variations, and device parameter
tolerances as well as input voltage variations.
The device incorporates a high-voltage switching MOSFET, an ON/OFF
control state-machine, a high-voltage switched current source for
self-biasing, frequency jitter to reduce EMI, cycle-by-cycle current limit
and hysteretic thermal shutdown circuitry into a monolithic IC. This high
level of integration enables cost-effective designs with very few
external components, reducing solution cost and driver size.
LYTSwitch-2 parts minimize energy consumption when the output is
unloaded. Practical designs can easily achieve less than 30 mW
no-load consumption.
The 725 V power MOSFET used in LYTSwitch-2 devices increases the
circuits’ ability to withstand input surge. In addition, each package is
designed to maximize the creepage distance between high-voltage pins
and logic level inputs. This increased pin spacing increases driver
lifetime and reliability in polluted environments. These in-built protection
features also protect the entire circuit from excess temperature
operation, increasing lifetime in thermally challenging environments.