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| Communication ICs Power supply unit for LCDs BP5302 / BP5302F The BP5302 and BP5302F are DC / DC converter units for supplying power to liquid crystal display (LCD) panels. The ICs supply a negative voltage from a positive power supply. They are available in a single in-line package as an upright (BP5302) or L-shaped lead (BP5302F) type. FApplications LCD panels in personal computers, word processors, copiers and facsimiles FFeatures 1) Wide input voltage range. ()5 to ) 14V) 2) Accurate output voltage. (*24 0.75V) 3) High conversion efficiency. (typically 80%) 4) Built-in protection circuit. 5) Built-in ON / OFF switch. 6) Compact and light. 7) Available as an upright or L-shaped lead type. FAbsolute maximum ratings 579 Communication ICs BP5302 / BP5302F FElectrical characteristics (unless otherwise noted, Ta = 25_C and R1 and R2 resistors in the measurement circuit FElectrical characteristics of Fig. 1 are disconnected) FPin descriptions 580 Communication ICs FMeasurement circuit and application example BP5302 / BP5302F FOperation notes (1) Place I / O external capacitors as near as possible to the connection pins. In particular, make sure to minimize the impedance between the input-side capacitor (C1) and pin 9. (Reference valve: A length less than 50mm is recommended for a copper foil of 1.0mm wide and 35m thick.) (2) Avoid frequent switching using the ON / OFF CTL pin (5 times per second at the maximum). (3) R1 and R2 resistors, which are used for changing the output voltage, are usually not required. 581 Communication ICs FElectrical characteristic curves BP5302 / BP5302F FExternal dimensions (Units: mm) 582 |
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