OB2225NCPA

OB2225N High Precision Low Cost Power Switch GENERAL DESCRIPTION FEATURES OB2225N 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 Mosfet 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 gate driver design. Low startup current and low operating current contribute to a reliable power on startup and low standby power consumption with OB2225N. OB2225N 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), Over Loading Protection(OLP) 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. OB2225N is offered in SOP8 package.               Universal AC input range and 12V output voltage 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 Over Loading Protection On-Chip OTP APPLICATIONS Low power AC/DC offline SMPS for  Small home appliance  Linear regulator/RCC replacement TYPICAL APPLICATION Drain CS Drain NC Drain GND Drain VDD DC OUT AC IN ©On-Bright Electronics Confidential -1- OB_DOC_DS_2225NA1 OB2225N High Precision Low Cost Power Switch Output Power Table GENERAL INFORMATION Pin Configuration The pin map is shown as below for SOP8 VDD 8 1 Topology 2 Drain 7 Drain CS 3 6 Drain 4 5 90~264Vac 176~264Vac (open frame) (open frame) Buck / 300mA 350mA Buck-Boost Note: Maximum continuous power with drain pattern connected 100mm2 PCB copper clad, at 85℃ ambient. OB2225N NC 176~264Vac (open frame) (open frame) Buck / 350mA 400mA Buck-Boost Note: Maximum continuous power with drain pattern 2 connected 100mm PCB copper clad, at 50℃ ambient. Topology GND 90~264Vac Absolute Maximum Ratings Parameter Drain Voltage(off state) VDD Voltage CS Input Voltage Min/Max Operating Junction Temperature TJ Operating Ambient Temperature TA Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) Note: Stresses beyond those Drain Ordering Information Part Number Description OB2225NCP SOP8, Halogen-free, Tube OB2225NCPA SOP8, Halogen-free, T&R Package Dissipation Rating Package RθJA (℃/W) SOP8 90 Note: Drain Pin Connected 100mm2 PCB copper clad. Value -0.3V to Bvdss -0.3 to 20V -0.3 to 7V -40 to 150 ℃ -40 to 85 ℃ -55 to 150 ℃ 260 ℃ 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. Recommended Operating Condition Symbol Parameter Range VDD VDD Supply Voltage 8 to 12V ©On-Bright Electronics Confidential -2- OB_DOC_DS_2225NA1 OB2225N High Precision Low Cost Power Switch Marking Information YWWZZZ OB2225NCP s Y:Year Code WW:Week Code(01-52) ZZZ:Lot Code C:SOP8 Package P:Halogen-free Package S:Internal Code(Optional) TERMINAL ASSIGNMENTS Pin Num 1 2 3 4 5/6/7/8 Pin Name VDD GND NC CS Drain ©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 Mosfet Drain pins. Confidential -3- OB_DOC_DS_2225NA1