Led Driver Switching Frequency

One factor is switching frequency.

Led driver switching frequency.

Pmp6015 this reference design provides a high brightness led driver based on the tps92075. Joined dec 27 2015 messages 35 points 0. Each device incorporates a high voltage power mosfet and discontinuous mode variable frequency variable on time controller. A modern led driver intended for portable applications should be able to switch at frequencies of up to 1 mhz.

As technology advances we will see better led driver applications capable of minimizing power consumption without trading off in terms of efficiency switching frequency component counts etc. An led cannot be toggled at arbitrarily high frequency once the pulse duration approaches the turn on time the led never really turns on fully hence linearity of pwm control is lost to begin with and at higher frequency shorter pulses eventually the led just stays dim or off. In most applications using a low voltage dc input led driver is recommended. Higher switching frequencies allow the use of smaller passive components.

I know than with higher switching frequency. There are two main types of drivers those that use low voltage dc input power generally 5 36vdc and those that use high voltage ac input power generally 90 277vac. Led driver switching frequency. It is designed to it is designed to operate with an input voltage in the range of 90vac to 132vac with a 120 vac nominal input voltage.

The lytswitch 5 family is ideal for single stage power factor corrected constant current led applications bulbs tubes and ballasts. Mar 24 2016 1 geeker new member. Start date mar 24 2016. Led drivers that use high voltage ac power are called off line drivers or ac led drivers.

High frequency led driver with integrated schottky and simple interconnect the sc4541 is a fully integrated high voltage boost step up and buck step down led driver. I try to understand the led driver and design my own. Hi all i m trying to build a high power high frequency led driver for an optical communications project. The idea i had was to create a constant current source.

The higher the better. The controller also provides fast cycle by cycle current limit input and output ovp plus advanced thermal. The input voltage range is 2 9v to 22v with output voltage up to 25v. This part of the electronics contains among other things a small transformer for transforming the voltage.

The switching power supply generates the operating voltage for the led s from the 120v mains voltage. My goal is to be able to power some high power leds 1 amp each at a high frequency 30mhz or more for data communication.