Become a member of this channel and get benefits: / @technologycursosoficial COURSES TAUGHT BY PROF. VALDENILTON: Basic Electronics Course Level 1 and 2 Online (100% in VIDEO) https://go.hotmart.com/S90922297H?dp=1 LCD/LED Digital TV Repair Course (100% in PDF) https://technologycursos.wixsite.com/... Transformer Winding Course (100% in PDF) https://hotm.art/Curso-de-enrolamento... SHARE THIS VIDEO WITH THOSE YOU LOVE: • How the stand by circuit works on a ... COURSES TAUGHT BY OTHER TEACHERS: Basic Electronics Course (focused on repair) https://hotm.art/Curso-de-eletronica-... Basic Electronics Course (with general focus) https://hotm.art/Curso-de-eletronica-... Cell Phone Repair Course (version 5.0) https://hotm.art/Conserto-de-celular-top Notebook Motherboard Repair Course https://hotm.art/Conserto-de-placa-ma... Voltage Inverter Manufacturing and Repair Course https://hotm.art/Aprenda-a-fazer-inve... Photovoltaic Solar Energy Course https://hotm.art/Curso-energia-solar-... Complete Digital Marketing Course (from scratch) https://hotm.art/Curso-de-Marketing-D... SUBSCRIBE TO OUR CHANNEL BY CLICKING THE LINK BELOW: / @technologycursosoficial INTRODUCTION: The standby source of digital TV, especially those that have all the boards gathered in one (All In One) works with voltage regulators from the TPS series, from Texas Instruments. In this series of two videos, you will learn how the start sequence of a TPS series voltage regulator IC of a switching power supply works. The start sequence of this series of integrated circuits involves some basic steps that ensure the safe and reliable start-up of the circuit. These regulators are designed to be efficient, stable and easy to implement. Below, see the details of how the start sequence of the TPS series voltage regulator IC works: STEP 1: APPLYING THE INPUT VOLTAGE (Vin) As soon as the input voltage is applied to pin 3 (VIN), the regulator IC begins to monitor the magnitude of the voltage to ensure that it is above the minimum operating voltage (threshold). Typically, there is a specification called UVLO (Under-Voltage Lockout), which prevents the regulator from operating until the input voltage reaches the minimum required threshold. 2ND STEP: ENABLING THE REGULATOR (Enable/EN Pin) A portion of the VIN voltage passes through a resistive divider that creates a voltage drop of approximately 2.1 V to polarize the EN pin (5) and enable the regulator IC to operate. If the EN pin is active (normally connected to Vin or a high logic level), the regulator will be enabled. If it is deactivated (low logic level), the regulator remains in a shutdown state, even if Vin is present. 3RD STEP: PULSE GENERATION After being powered by pin 3 (VIN) and enabled by pin 5 (EN), the regulator IC starts to oscillate, producing high-frequency pulses that are output through pin 2 (SW). 4TH STEP: BOOTSTRAP CAPACITOR A portion of the output pulses from pin 2 (SW) returns to the internal control of the regulator IC through pin 6 (VBST) through the bootstrap capacitor. 5th STEP: FILTERING The high-frequency pulses that exit through pin 2 (SW) go to the LC filter, where they will be filtered and transformed into a pure continuous voltage, worth 3.3 V. 6th STEP: FEEDBACK AND STABILIZATION A portion of the voltage filtered by the LC filter (3.3 V) returns to the regulator IC through pin 4 (VFB) through a resistive divider that creates a reference voltage of approximately 0.77 V for the internal comparator. PROTECTION MONITORING: During startup and continuous operation, the regulator IC checks: Overcurrent: Limits the current to prevent damage, through OCP (Over Current Protection) protection. Overtemperature: Turns off the regulator if the temperature exceeds the safe limit through OTP (Overtemperature Protection) protection. Overvoltage: Protects connected devices against voltages above the expected through OVP (Overvoltage Protection) protection. CONCLUSION: I hope that by the end of this series of two classes you have understood how the standby circuit of the switched-mode power supply with TPS regulator works and can now perform maintenance on this circuit with greater safety and competence. Hello, I am Professor Valdenilton, Technical Coordinator of the Electronics courses taught by Technology Cursos. I love transforming people's lives through teaching. My goal is to teach people like you to repair the electronic equipment they love, helping in every way possible. INFORMATION: Business contact: [email protected] Whatsapp Center: (82) 9 8706-9200 (Only by messages or audio)