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High Precision CC/CV PSR PWM Switch

DESCRIPTION

RS2138A is a high performance offline PSR controller for low power AC/DC charger and adapter applications, Less than 75mW standby power consumption with typical application. It operates in primary-side sensing and regulation, so opto-coupler and TL431 could be eliminated. In CC control, the current and output power can be adjusted externally by the sense resistor RS at CS pin. In CV control, a PFM operation is utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built-in cable drop compensation. RS2138A offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD over voltage protection, VOUT over voltage protection, feedback loop open protection, short circuit protection, built-in leading edge blanking, VDD under voltage lockout (UVLO).

APPLICATIONS

 Switching AC/DC Small Power Adaptor  Cell Phone Charger  Digital Cameras Charger  Auxiliary Power for PC, TV etc  Linear Regulator/RCC Replacement

FEATURES

 Standby power less than 75mW  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  Multi-mode PWM/PFM operation for efficiency improving  Audio noise free operation  Programmable Cable Drop Compensation  Built-in line voltage and primary winding inductance compensation  No need for control loop compensation  Built-in Feedback Loop Open Protection  VDD Over Voltage Protection  VOUT Over Voltage Protection  Built-in 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)  DIP-8L green Package

V1.0 2 July 2018 BLOCK DIAGRAM DRAIN CS LVDD GND PWM LOGIC OVP Vth FB sampler CC control Output ovp Drop comp vref EA CV Control UVLO LEB OCP Driver Gate VDD1 APPLICATION CIRCUIT NC FB VDD DRAIN GND RS2138A AC DC Output DRAIN CS GND

V1.0 3 July 2018 ORDER INFORMATION DEVICE DEVICE CODE RS2138A Y Y is package & Pin Assignments designator : P : DIP-8 PIN CONFIGURATION DIP-8 VDD NC FB CS DRAIN DRAIN GND GND1 PIN DESCRIPTION Pin Name Description Pin No VDD Power Supply 1 NC No Connection 2 FB The voltage feedback from auxiliary winding. Connected to resistor divider from auxiliary winding reflecting out voltage. 3 CS Current sense input 4 DRAIN Drain of internal power MOSFET 5/6 GND GND Pin 7/8

V1.0 11 July 2018 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 assum e 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