the active power factor correction (PFC) of FAN4810 Circuit design


Posted on Feb 6, 2014

FAN4810 work, to the average current, electric current of front continuously CCM The work pattern of voltage output rises, the internal treble safe detection technique can make the circuit avoid making the circuit not in normal operating conditions because components and parts of a certain circuit are damaged; The grid outputs power-handling capab


 the active power factor correction (PFC) of FAN4810 Circuit design
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ility and is up to 1A, therefore needn`t connect the power MOSFET driving circuit!; The low power consumption characteristic has improved the operating efficiency of the circuit, and reduced the loss of the components and parts. FAN4810 also has crest current that limits the function, utilize overlow protection and protective circuit of output voltage of input voltage of internal exchange, can shut off the work of PFC circuit through the internal over voltage comparator in case of sudden change of output load, it can be used in the synchronous subordinate PWM circuit, in order to reduce the circuit to work rash to output the clock signal. The pin picture of FAN4810 is shown as in Fig. 1, their functional block diagrams of job are shown as in Fig. 2, FAN4810 pin function shown in Table 1. The following introduction adopts circuit design relevant methods of 500W power factor correction of FAN4810, the working principle diagram of the circuit is shown as in Fig. 4, PFC output voltage of this 500W output circuit is 400VDC, the output current is 1. 25A, the accommodation of voltage of city power of ac input is 90- 264VAC. FAN4810 work, to the average current, electric current of front continuously CCM The work pattern of voltage output rises, the internal treble safe detection technique can make the circuit avoid making the circuit not in normal operating conditions because components and parts of a certain circuit are damaged;...




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