OB2225MCPA

OB2225M High Precision Low Cost Power Switch GENERAL DESCRIPTION FEATURES OB2225M is a high performance, high precision and low cost PWM Power switch for non-isolated buck and buck-boost application. It combines a dedicated current mode PWM controller with a high voltage power Bipolar in SOP8 package. Its built-in error amplifier is optimized for good overshoot and dynamic response for low cost and component count. With precise inner resistor divider, precise reference of EA ， constant voltage regulation of 12V at universal AC input can be guaranteed. Frequency reduction and burst mode control is implemented for high efficiency at light load. Good EMI performance is achieved with On-Bright proprietary frequency shuffling technique and soft base driver design. Low startup current and low operating current contribute to a reliable power on startup and low standby power consumption with OB2225M. Constant power operation is supported at over load application with OB2225M, which makes it suitable for small home appliance application where instant large power consumption is required such as start-up of a fan. OB2225M offers power on soft start control and protection coverage with auto-recovery features including cycle-by-cycle current limiting, output short circuit protection, on-chip Over Temperature Protection (OTP), VDD Over Voltage Protection (OVP), and VDD Under Voltage Lockout Protection (UVLO). The tone energy at below 20KHz is minimized in the design so that audio noise is eliminated during operation. OB2225M is offered in SOP8 package.               Universal AC input range and 12V output voltage Constant power mode operation at over load application Low cost and less BOM for buck and buckboost applications Current mode control 40kHz (typical) maximum switching frequency Frequency-reduction and burst mode control for high efficiency Frequency shuffling for EMI improvement Power on soft-start Built-in Leading Edge Blanking (LEB) Cycle-by-cycle current limiting Output short-circuit protection VDD Under Voltage Lockout with Hysteresis VDD OVP On-Chip OTP APPLICATIONS Low power AC/DC offline SMPS for  Small home appliance  Linear regulator/RCC replacement TYPICAL APPLICATION C CS C NC C GND C VDD DC OUT AC IN ©On-Bright Electronics Confidential -1- Datasheet OB_DOC_DS_2225MA0 OB2225M High Precision Low Cost Power Switch Output Power Table 90~264Vac 176~264Vac Topology (open frame) (open frame) Buck/Buck250mA 300mA Boost Note: Maximum continuous power with drain pattern GENERAL INFORMATION Pin Configuration The pin map is shown as below for SOP8 VDD 8 1 2 connected 100mm PCB copper clad, at 50℃ ambient. C Topology GND 2 7 C CS 3 6 C 5 4 176~264Vac (open frame) Buck/Buck200mA 250mA Boost Note: Maximum continuous power with drain pattern OB2225M NC 90~264Vac (open frame) connected 100mm2 PCB copper clad, at 85℃ ambient. Absolute Maximum Ratings Parameter C-B Voltage VDD Voltage CS Input Voltage Min/Max Operating Junction Temperature TJ Operating Ambient Temperature TA Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) C Ordering Information Part Number Description OB2225MCP SOP8, Pb-free, Tube OB2225MCPA SOP8, Pb-free, T&R Package Dissipation Rating Package RθJA (℃/W) SOP8 90 Value 700V -0.3 to 20V -0.3 to 7V -40 to 150 ℃ -40 to 85 ℃ -55 to 150 ℃ 260 ℃ Note: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. 2 Note: C Pin Connected 66mm PCB copper clad. Recommended Operating Condition Symbol Parameter Range VDD VDD Supply Voltage 5.5 to 12V ©On-Bright Electronics Confidential -2- Datasheet OB_DOC_DS_2225MA0 OB2225M High Precision Low Cost Power Switch Marking Information TERMINAL ASSIGNMENTS Pin Num 1 2 3 4 5/6/7/8 Pin Name VDD GND NC CS C ©On-Bright Electronics I/O I P NC I O Description Power Supply and Output Voltage Feedback Ground It should be floating or connect ground during normal operation state Current sense input Power bipolar collector pins. Confidential -3- Datasheet OB_DOC_DS_2225MA0