{1141A} SMPS circuit without optocoupler 

In this video number {1141A} SMPS circuit without optocoupler. I explained 5 volt 1 ampere cell phone charger circuit using DP1801 Quasi-Resonant PSR CC/CV PWM Power Switch. it is offline switching IC, uses auxiliary voltage as feedback. DP1801B integrates functions and protections of Under Voltage Lockout (UVLO), VDD over Voltage Protection (VDD OVP), Cycle-by-cycle Current Limiting (OCP), Short Load Protection (SLP), On-Chip Thermal Shutdown, VDD Clamping. DP1801B is a high performance, multi mode, highly integrated Quasi Resonant Primary Side Regulation (QR-PSR) power switch. The built-in high precision CV/CC control with high level protection features makes it suitable for offline small power converter applications
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