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RS5RJ5045B-T2 Datasheet(PDF) 8 Page - RICOH electronics devices division |
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RS5RJ5045B-T2 Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 30 page 7 RS5RJ OPERATION OF STEP-UP DC/DC CONVERTER Step-up DC/DC Converter charges energy in the inductor when Lx Transistor (LxTr) is ON, and discharges the energy with the addition of the energy from Input Power Source thereto when LxTr is off, so that a higher output voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams: < Current through L > < Basic Circuits > i2 SD LX Tr i1 L CL VIN IOUT VOUT IL IL min IL max topen ton toff t T=1/ fosc Step.1 : LxTr is turned on and current IL (= i1 ) flows, so that energy is charged in L. At this moment, IL(=i1 ) is increased from ILmin (= 0) to reach ILmax in proportion to the on-time period (ton) of LxTr. Step.2 : When LxTr is turned off, Schottky diode (SD) is turned on in order that L maintains IL at ILmax, so that current IL (= i2) is released. Step.3 : IL (=i2) is gradually decreased, and in the case of discontinuous mode, IL reaches ILmin (=0) after a time period of topen, so that SD is turned off. In the case of the VFM control system, with the on-time period (ton) maintained constant, the output voltage is maintained constant by controlling the oscillator frequency (fosc). |
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