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RS2112 Dataheets PDF



Part Number RS2112
Manufacturers Orister
Logo Orister
Description Primary-Side Regulation PWM Power Switch
Datasheet RS2112 DatasheetRS2112 Datasheet (PDF)

Page No. : 1/9 RS2111/RS2112 Primary-Side Regulation PWM Power Switch Description RS2111/RS2112 is an offline PWM Power switch for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated from design. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. V0 8-Lead Plastic DIP-8 Package Code: P  8-Lead Plastic SOP-8 Package Code: S I.

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Page No. : 1/9 RS2111/RS2112 Primary-Side Regulation PWM Power Switch Description RS2111/RS2112 is an offline PWM Power switch for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated from design. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. V0 8-Lead Plastic DIP-8 Package Code: P  8-Lead Plastic SOP-8 Package Code: S I0 Fig1. Typical CC/CV Curve In CC control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode operations are utilized to achieve high performance and high efficiency. Device operates in fixed frequency mode at large load conditions, frequency reduction mode at light/medium load and ‘Extended burst mode’ at No/light load conditions. RS2111/RS2112 offers power on soft start control and complete protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD over-voltage clamp and UVLO, fail-safe protection for open loop fault condition. Excellent EMI performance is achieved with Orister proprietary frequency Jiggling technique together with soft switching control at the totem pole gate drive output with No-Y Cap design. Features  Primary-side Sensing and Regulation With No 431 and Opto-coupler  Multi-mode operation for High Efficiency  Programmable CV and CC Regulation  Adjustable Constant Current and Output Power setting  Frequency Jiggling and Adjustable Gate Drive Greatly Improved EMI  Power on Soft-start Time (4ms)  Burst mode Control for Improved Efficiency and Minimum standby Design  Built-in Leading Edge Blanking (LEB)  Cycle-by-Cycle Current Limiting  VDD Under Voltage Lockout with Hysteresis (UVLO)  VDD Over Voltage Shutdown and Clamp  Auto-restart in Over Voltage condition  Fail-safe protection for open loop fault condition  Compatible with OB2211/OB2212  Pb-Free SOP-8L & DIP-8L Applications  Low Power AC/DC offline SMPS  Cell Phone Charge  Digital Cameras Charger  Small Power Adaptor  Auxiliary Power for PC, TV etc.  Linear Regulator/RCC Replacement DS-RS2111/RS2112-01 Oct, 2008 www.Orister.com Page No. : 2/9 Pin Connections Pin Name PIN 1: VDD-G 8 7 6 5 I/O P Internal Gate Driver Power Supply P IC DC power supply Input Description PIN 2: VDD PIN 3: INV 1 2 3 4 Inverting input of error amplifier (EA). Connected to resistor divider from primary sensing I winding reflecting output voltage. PWM duty cycle is determined by EA output and current sense signal at pin4. I Current sense input P Ground PIN 4: CS PIN 7 & 8: GND PIN 5 & 6: DRAIN O HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer. Typical Application Circuit Block Diagram DS-RS2111/RS2112-01 Oct, 2008 www.Orister.com Page No. : 3/9 Absolute Maximum Rating (Note) Parameter Value Unit Drain Voltage (off state) .


RS2111 RS2112 RS2112


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