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LA5724M Scheda tecnica(PDF) 4 Page - Sanyo Semicon Device |
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LA5724M Scheda tecnica(HTML) 4 Page - Sanyo Semicon Device |
4 / 5 page LA5724M No.A0586-4/5 Protection Circuit Functional Descriptions 1. Overcurrent protection function The overcurrent protection function detects, on a cycle-by-cycle basis, the output transistor current and turns off that output transistor current if it exceeds 0.7A in a cycle-by-cycle manner. 2. Short circuit protection function This IC prevents the current from increasing when the outputs are shorted by setting the switching frequency to 30kHz if the VOS pin voltage falls below 0.8V. Note : Since the switching frequency becomes 30kHz when the VOS pin voltage falls under 0.8V, the current capacity is reduced. If a load is applied with the VOS pin voltage over 0.8V, the inductance value operates at 47µH. If a load is to be applied when this voltage is under 0.8V, the inductance value must be increased. Description of Functional Settings 1. Calculation equation to set the output voltage This IC controls the switching output so that the VOS pin voltage becomes 1.23V (typ). The equation to set the output voltage is as follows : The VOS pin has the inrush current of 1µA (typ). Therefore, the error becomes larger when R1 and R2 resistance values are large. Limit current Inductor current SWOUT voltage VO = 1+ × 1.23V(typ) R2 R1 |
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