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.