SOME GOOD TECHNICIAN COULD EXPLAIN HOW THE INTEGRATED CIRCUIT WORKS 5Q0765RT WHICH IS USED IN SWITCHED SOURCES OF CRT TELEVISIONS, MY MAIN DOUBT IS WHAT IS THE POWER SUPPLY VOLTAGE OF THIS INTEGRATED IS BY PIN 1 OR PIN 3, VERY TRUE A BRIEF EXPLANATION OF ITS OPERATION TO SEE IF I LEAVE DOUBTS AND THANKS.

Amigo that integrated is a Occulator with mosfet included that works in pwm sources. 1-drain; 2-gnd; 3-vcc; 4-Fbp; 5-sync This integrated can be configured in several ways but with the same objective that is to achieve in a controlled way (pwm) that the primary of the transformer induces the necessary voltages in the secondary. Pin 1 goes one end of the primary winding since the other end goes to + B, the 2nd to gnd; the 3 is vcc of the integrated that feeds on a secondary winding that is in the cold area of the source, you put a 47 microf filter to filter that power and a resistance of 150K to pin 1 (which is used as a car source start) ; 4 is the control pin and therefore goes to pin 4 of the optocoupler since this is the one who increases or decreases the pulse width depending on the information provided by the secondary through the optocoupler, here you connect a capacitor of 100 nanos to gnd and 5 is synchronism or protection since it is who makes the sensing of current, voltage and temperature, to which I connect to gnd through a 1K resistor. In this way I have adapted this integrated to every pwm source that I have found and I have not had the original integrated and it has worked great. Any questions write to me without problems. Greetings and luck

on pin 1 goes 173v if the line is 110v, on pin 3 vcc there is a 27v zener, which is the maximum voltage that the integrated can withstand, if pin 3 has the same voltage as pin 1 there is an internal short in the integrated. that voltage comes from the chopper transformer which is its auxiliary voltage when the integrated one starts to oscillate, on pin 4 of the integrated one the "PWM PULSE WIDTH" of the regulator is controlled and from there comes the optocoupler signal of which it is in charge of "regulating the voltage in the B +" and in all secondary voltages, depending on the model is controlled by a tl431 or bipolar transistors, this SUBJECTS OR LOW the operating voltage of the source, beyond that it must monitor some resistances that they come directly from the bridge rectifier that has a "standby" voltage