DPA425 is American POWER Integrations company's pulse width modulator, P, G, R three different forms of packaging, each pin function is as follows: C foot as the input of error amplifier and feedback current, external through photoelectric coupler drop-down current to adjust the duty ratio; L feet for voltage detection, to provide users with overpressure OV, overvoltage UV, synchronous control, synchronous pulse, introduced in the foot, working circuit synchronous mode, but the synchronous signal than the oscillator frequency; The X foot is the limit current setting end, and the resistance of the different parameters is connected to the source and the limit of the DPA425 can be set. The s-foot is the source extreme, the primary control circuit common point and reference point, internal connection power. The source of MOSFET; D foot is the drain. The input voltage range is 1 ~ 75VDC, and the offset current can be provided by the internal high voltage current source at startup.

基于DPA425的开关电源的设计与研制.pdf

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