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FAN7930B

ON Semiconductor

PFC Controller

Critical Conduction Mode PFC Controller FAN7930B Description The FAN7930B is an active power factor correction (PFC) con...


ON Semiconductor

FAN7930B

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Description
Critical Conduction Mode PFC Controller FAN7930B Description The FAN7930B is an active power factor correction (PFC) controller for boost PFC applications that operate in critical conduction mode (CRM). It uses a voltage−mode PWM that compares an internal ramp signal with the error amplifier output to generate a MOSFET turn−off signal. Because the voltage−mode CRM PFC controller does not need rectified AC line voltage information, it saves the power loss of an input voltage sensing network necessary for a current−mode CRM PFC controller. FAN7930B provides over−voltage protection (OVP), open−feedback protection, over−current protection (OCP), input−voltage−absent detection, and under−voltage lockout protection (UVLO). The additional OVP pin can be used to shut down the boost power stage when output voltage exceeds OVP level due to the resistors that are connected at INV pin are damaged. The FAN7930B can be disabled if the INV pin voltage is lower than 0.45 V and the operating current decreases to a very low level. Using a new variable on−time control method, total harmonic distortion (THD) is lower than in conventional CRM boost PFC ICs. Features Additional OVP Detection Pin VIN−Absent Detection Maximum Switching Frequency Limitation Internal Soft−Start and Startup without Overshoot Internal Total Harmonic Distortion (THD) Optimizer Precise Adjustable Output Over−Voltage Protection Open−Feedback Protection and Disable Function Zero Current Detector (ZCD) 150 ...




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