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Technical content
High Precision CC/CV PSR PWM Switch
DESCRIPTION
RS2122A is a high performance offline PSR controller for low power AC/DC charger and adapter applications. It operates in primary -side sensing and regulation, so opto -coupler and TL431 could be eliminated. In CC control, the current and output power setting can be adjusted externally by the sense resistor RS at CS pin. In CV control, PFM operations are utilized to achieve high performance and high efficiency. In additi on, good load regulation is achieved by the built-in cable drop compensation. The chip consumes very low operation current (typical 650μA), it can achieve less than 30mW standby power to meet strict standby power standard. RS2122A offers comprehensive prot ection coverage with auto-recovery features including Cycle -by-Cycle current limiting, VDD over voltage protection, feedback loop open protection, CS open protection, Output short circuit protection, built -in leading edge blanking, VDD under voltage lockou t (UVLO), Over temperature protection, etc. RS2122A is offered in SOP-7L package.
APPLICATIONS
Switching AC/DC Small Power Adaptor Cell Phone or Digital Cameras Charger Auxiliary Power for PC, TV etc Linear Regulator/RCC Replacement
FEATURES
Low startup current ±4% CC and ±5% CV Precision Primary-side Sensing and Regulation Without TL431 and Opto-coupler High precision constant voltage and current regulation at universal AC input Programmable CV and CC Regulation Built-in Primary winding inductance compensation Programmable Cable Drop Compensation Built-in Feedback Loop Open Protection Built-in CS Open Protection VDD Over Voltage Protection Built-in Output Short Circuit Protection Built-in Leading Edge Blanking (LEB) Over temperature protection(OTP) Cycle-by-Cycle Current Limiting VDD Under Voltage Lockout with Hysteresis (UVLO) SOP-7L green Packaging BLOCK DIAGRAM VDD VDD OVP Output OVP CC Control DEM Drop comp FB FB Short Protection Output Short Protection Sample Compensation Network CV ControlPWM Model PFM Model Soft Start LEB CS 0.5V CS Floating Protection R S Q BJT Base Driver LD LOGIC POR GND
V1.0 2 September 2016 APPLICATION CIRCUIT AC VDD FB FB CS GND LD LD RS2122A
V1.0 3 September 2016 ORDER INFORMATION Device Device Code RS2122A Y Y is package & Pin Assignments designator : S : SOP7 PIN CONFIGURATION SOP-7 VDD FB FB CS LD LD GND1 PIN DESCRIPTION Pin Name Description Pin No VDD Supply voltage pin. 1 FB Voltage feedback pin. 2, 3 CS Current sense pin, a resistor connects to sense the NPN current. 4 LD NPN collect 5, 6 GND Supply voltage pin. GND Pin. 7
V1.0 10 September 2016 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw