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        1. OB2268/ob2268c pdf datasheet

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          上传日期: 2008-08-13

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          OB2268C is a highly integrated current mode PWM
          control IC opTImized for high performance, low
          standby power and cost effecTIve offline flyback
          converter applicaTIons.
          PWM switching frequency at normal operation is
          externally programmable and trimmed to tight range.
          At no load or light load condition, the IC operates in
          extended ‘burst mode’ to minimize switching loss.
          Lower standby power and higher conversion
          efficiency is thus achieved.
          VDD low startup current and low operating current
          contribute to a reliable power on startup design with
          OB2268C. A large value resistor could thus be used
          in the startup circuit to minimize the standby power.
          The internal slope compensation improves system
          large signal stability and reduces the possible subharmonic
          oscillation at high PWM duty cycle output.
          Leading-edge blanking on current sense input
          removes the signal glitch due to snubber circuit diode
          reverse recovery. This greatly helps to reduce the
          external component count and system cost in
          OB2268C offers complete protection coverage with
          automatic self-recovery feature including Cycle-by-
          Cycle current limiting (OCP), over load protection
          (OLP), over temperature protection (OTP), VDD
          over voltage protection (OVP) and under voltage
          lockout (UVLO). The Gate-drive output is clamped
          at 18V to protect the power MOSFET.
          In OB2268C, OCP threshold slope is internally
          optimized to reach constant output power limit over
          universal AC input range.
          Excellent EMI performance is achieved with soft
          switching control at the totem pole gate drive output.


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