Texas Instruments UCC28811

the ucc28810 and ucc28811 are general lighting power controllers for low to medium power lumens applications requiring power factor correction and emc compliance. it is designed for controlling a flyback buck or boost converter operating in critical conduction mode. it features a transconductance voltage amplifier for feedback error processing a simple current reference generator for generating a current command proportional to the input voltage a current-sense (pwm) comparator pwm logic and a totem-pole driver for driving an external fet. in the critical conduction mode operation the pwm circuit is self-oscillating with the turn-on being governed by a transformer zero energy detector (tze pin) and the turn-off being governed by the current sense comparator. view all in datasheet