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RS2132
High Precision CC/CV Primary‐Side PWM Controller
General Description
RS2132 is a high performance offline PWM controller for low power AC/DC charger and adapter applications. It operates in primary‐side
sensing and regulation. Consequently, opto‐coupler and 431 could be eliminated. Proprietary Constant Voltage (CV) and Constant
Current (CC) control is integrated as shown in the figure below.
In CC control, the current and output power setting can be adjusted externally by the sense resistor at CS pin. In CV control, multi‐mode
operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built‐in cable
drop compensation. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction
at light/medium load.
RS2132 offers power on soft start control and protection coverage with auto‐recovery features including Cycle‐by‐Cycle current limiting,
VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with Orister proprietary frequency jiggling technique. High
precision constant voltage (CV) and constant current (CC) can be achieved by RS2132.
Features
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±5% Constant Voltage Regulation at Universal AC input
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High Precision Constant Current Regulation at Universal AC
input
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Primary‐side Sensing and Regulation Without 431 and Opto‐
coupler
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Programmable CV and CC Regulation
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Adjustable Constant Current and Output Power Setting
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Built‐in Secondary Constant Current Control with Primary Side
Feedback
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Built‐in Adaptive Current Peak Regulation
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Built‐in Primary winding inductance compensation
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Programmable Cable drop Compensation
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Power on Soft‐start
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Built‐in Leading Edge Blanking (LEB)
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Cycle‐by‐Cycle Current Limiting
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VDD Under Voltage Lockout with Hysteresis (UVLO)
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VDD OVP & VDD Clamp
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Available in an SOT‐26 Package
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RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen
Free with Commercial Standard)
Applications
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Cell Phone Charger
Digital Cameras Charger
Small Power Adaptor
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
Fig.1. Typical CC/CV Curve
DS‐RS2132‐03
September,
2009
www.Orister.com
ORISTER [ ORISTER CORPORATION ]
