Datasheet RAA223181 900V Off-Line Flyback Regulator The RAA223181 is an off-line Flyback regulator with a Features 900V integrated MOSFET, designed for high input Flyback regulator with 900V 10 MOSFET voltage and high reliability application of smart meter Single 400V input capacitor for input up to 450V AC power supplies and other general isolated power Frequency doubling for heavy load operation (up to supplies. 12W), with programmable duration <100ms The RAA223181 operates in DCM with constant Valley switching to reduce switching losses switching frequency at full load. The system is Programmable constant frequency DCM operation inherently stable with an easy feedback loop design, (recommended range 50kHz ~100kHz) while switching at constant frequency without interfering the communication of the smart meter. At Burst mode operation at light load light load, RAA223181 enters burst mode operation to Protection features: Short-Circuit Protection (SCP), reduce the IC power consumption, while keeping the Overload Protection (OLP), Input Undervoltage burst frequency less than 3kHz to avoid interference Lockout (VinUV), Input OVP, VCC Overvoltage to the PLC frequency band. Protection (VccOV), VCC Undervoltage Lockout (VccUV) and Over-Temperature Protection (OTP). RAA223181 features a unique short-time heavy load operation mode, which delivers up to 12W output power for a programmed time period. This allows the Applications smart meter power supply to be designed at regular Smart Meter power level without being over-designed for 2x power Large appliances in the transmission mode, which greatly reduces Industry control system cost. RAA223181 also has a cost-saving feature for the L input voltage higher than 265V , where usually two + AC V O N stacked 400v electrolytic capacitors are required after the bridge rectifier. RAA223181 uses only one 400V capacitor. The IC detects the over-voltage and + disconnect the input capacitor from the DC bus with a + MOSFET and stop switching. This saves the cost on VCC VDET D expensive high voltage electrolytic capacitors. PRO HV S In addition, the RAA223181 adopts valley switching CDRV OVLD FSET technique to reduce the switching losses to improve FB GND thermal performance at high temperature operation. Besides it also features input brown-out protection, output overload, short circuit, VccUV, VccOV, VinUV, peak current limit, primary short, and Figure 1. Typical RAA223181 Flyback Circuit over-temperature protections. All these features are integrated in a SO16-13 package. R16DS0195EU0100 Rev.1.00 Page 1 Oct 13, 2021 2021 Renesas ElectronicsRAA223181 Datasheet Contents 1. Overview . 3 1.1 Block Diagram . 3 2. Pin Information 4 2.1 Pin Configuration . 4 2.2 Pin Descriptions . 4 3. Specifications . 5 3.1 Absolute Maximum Ratings . 5 3.2 Thermal Information 5 3.3 Recommended Operating Conditions . 5 3.4 Electrical Specifications 6 4. Typical Performance Graphs . 8 4.1 Characterization Curves . 8 4.2 Typical Waveforms . 9 5. Detailed Description . 10 5.1 Soft Start-Up . 12 5.2 Overload and Short-Circuit Protection 13 6. Application Topologies . 14 7. Design Guidance 15 7.1 Input Buffer Capacitor 15 7.2 Transformer Primary Inductance and Turns Ratio . 15 7.3 Current Sensing Resistor . 16 7.4 FSET Pin Resistor . 16 7.5 VDET Pin Resistors 16 7.6 PRO Pin Resistors 16 7.7 PRO Pin Capacitor 16 7.8 MOSFET in Series with C 1 . 17 7.9 OLV Pin Capacitor . 17 7.10 Output Capacitance 17 7.11 PCB Layout Guidance 17 8. EMI Performance 19 9. Package Outline Drawing . 20 10. Ordering Information . 21 11. Revision History 21 R16DS0195EU0100 Rev.1.00 Page 2 Oct 13, 2021