RS2135 Datasheet, PDF (1/10 Pages) Orister Corporation – High Precision CC/CV Primary‐Side PWM Power Switch

RS2135
High Precision CC/CV Primary‐Side PWM Power Switch
Page No. : 1/10
General Description
RS2135 is a high performance 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 431 could be eliminated. Proprietary Constant Voltage (CV) and Constant
Current (CC) control is integrated as shown in the Fig.1.
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. 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.
RS2135 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 Frequency Jiggling.
Features
Applications
● 5% Constant Voltage Regulation, 5% Constant Current ● Cell Phone Charger
Regulation at Universal AC input
● Digital Cameras Charger
●
Primary‐side Sensing and Regulation Without 431 and Opto‐
●
●
Small Power Adaptor
Auxiliary Power for PC, TV etc.
coupler
● Linear Regulator/RCC Replacement
● Power on Soft‐start
● Built‐in Leading Edge Blanking (LEB)
● Cycle‐by‐Cycle Current Limiting
● VDD Under Voltage Lockout with Hysteresis (UVLO)
● Programmable CV and CC Regulation
● Adjustable Constant Current and Output Power Setting
● Built‐in Secondary Constant Current Control with Primary Side
Feedback
● Built‐in adaptive current peak regulation
● Built‐in Primary winding inductance compensation
● Program cable drop compensation
● VDD OVP and VDD Clamp
● Available in an SOP‐8 Package
● RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen
Free with Commercial Standard)
DS‐RS2135‐03 September, 2009
Fig.1. Typical CC/CV Curve
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