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RS2135SP Datasheet(PDF) 5 Page - Orister Corporation |
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RS2135SP Datasheet(HTML) 5 Page - Orister Corporation |
5 / 10 page Page No. : 5/10 DS‐RS2135‐03 September, 2009 www.Orister.com Detail Description RS2135 is a cost effective PWM power switch optimized for off‐line low power AC/DC applications including battery chargers and adaptors. It operates in primary side sensing and regulation, thus opto‐coupler and 431 are not required. Proprietary built‐in CV and CC control can achieve high precision CC/CV control meeting most adaptor and charger application requirements. Startup Current and Start up Control Startup current of RS2135 is designed to be very low so that VDD could be charged up above UVLO threshold and starts up quickly. A large value startup resistor can therefore be used to minimize the power loss in application. Operating Current The Operating current of RS2135 is as low as 2.5mA. Good efficiency is achieved with the low operating current together with Multi‐mode control features. Soft Start RS2135 features an internal soft start to minimize the component electrical over‐stress during power on startup. As soon as VDD reaches UVLO (OFF), the control algorithm will ramp peak current voltage threshold gradually from nearly zero to normal setting of 0.90V. Every restart is a soft start. CC/CV Operation RS2135 is designed to produce good CC/CV control characteristic as shown in the Fig. 1. In charger applications, a discharged battery charging starts in the CC portion of the curve until it is nearly full charged and smoothly switches to operate in CV portion of the curve. In an AC/DC adapter, the normal operation occurs only on the CV portion of the curve. The CC portion provides output current limiting. In CV operation, the output voltage is regulated through the primary side control. In CC operation mode, RS2135 will regulate the output current constant regardless of the output voltage drop. Principle of Operation To support RS2135 proprietary CC/CV control, system needs to be designed in DCM mode for flyback system (Refer to Typical Application Diagram). In the DCM flyback converter, the output voltage can be sensed via the auxiliary winding. During MOSFET turn‐on time, the load current is supplied from the output filter capacitor CO. The current in the primary winding ramps up. When MOSFET turns off, the primary current transfers to the secondary at the amplitude of P S P S I N N I × = The auxiliary voltage reflects the output voltage as shown in fig.2 and it is given by ) V V ( N N V O S AUX AUX Δ + × = Where ΔV indicates the drop voltage of the output Diode. |
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