Nowadays, the safety requirements are becoming higher, and the use of resistance-capacitance step-down is less and less. The cost of using ordinary switching power supply solutions is high, and a non-isolated power supply circuit is needed instead.
On-Bright Elec OB2222ECP (SMD) non-isolated 5V/150MA or less application special replacement for resistance-capacitance step-down, high price ratio, low power consumption AC/DC offline switching power supply, application areas: small household appliances, linear regulators, smart photos ：Personal care (hair straightener), fan health pot, etc.
Universal AC input range and 5.0V output voltage overload constant power mode operation application low cost and low BOM step-down and BACKBOOST application current mode control 40kHz (typical) maximum switching frequency frequency reduction and burst mode control High efficiency for EMI improvement Frequency shuffle power supply soft start Built-in leading edge blanking (Leb) cycle cycle by cycle current limit FB pin open loop protection output short circuit protection voltage hysteresis locked VDDVDD OVP on chip OTP
Typical circuit diagram
OB2222E provides protection coverage with auto-recovery features for soft-start control of power supply, including cycle-by-cycle current limit, output short-circuit protection, FB pin open-loop protection, on-chip over-temperature protection (OTP), VDD over-voltage protection (OVP), and VDD under Voltage lock protection (UVLO). Tone energy below 20kHz is minimized. Audio noise was eliminated during the design process.
OB2222E is a high-performance, high-precision non-isolated low-cost PWM power switch Buck and Buck Boost application. It combines a dedicated current mode PWM controller, bipolar high voltage power supply in SOP8 package. Its built-in error amplifier is optimized for low-cost overshoot and dynamic response component count.
Precision internal resistance divider, accurate reference to electric potential, constant voltage 5.0V in the adjustment of universal AC input at ease. Frequency reduction and burst mode achieve efficient control of the load in the light. Good electromagnetic interference performance realizes a bright soft base driver design with proprietary frequency shuffling technology. Low startup current Low working current helps reliable startup power and low standby power. Supports operation with OB2222E constant power consumption and overload applications with OB2222E, which makes it suitable for small instant large appliances applications that require power consumption