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RS5RM3531A Datasheet(PDF) 9 Page - RICOH electronics devices division |
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RS5RM3531A Datasheet(HTML) 9 Page - RICOH electronics devices division |
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9 / 30 page  8 RS5RM – + – + LX Tr LX PWM OSC Vref1 Vref2 Pch Tr VSS 100µF 100µH VDD VOUT VOUT VIN 22µF 1µF 5 1 86 FIG. A Diagram of RS5RM including external circuits OPERATION 1. VDD Output Voltage VDD output voltage is shown in Fig. B. (1) In the case of VIN–Vf ≥VDD0: In Area B, LxTr is maintained in an OFF state, so that VIN–Vf (V) is output as it is from VDD pin without step-up operation. (2) In the case of VIN–Vf<VDD0: In Area A, this IC functions as Step-up DC/DC converter. The step-up operation will now be explained with reference to FIG. A. The step-up operation is an operation for regulating the VDD output voltage by com- paring Vref1 and the VDD output voltage by error amplifier circuits and subjecting LxTr to on-time control by PWM circuits (i.e., by controlling the step-up operation). 2. VOUT Output Voltage A constant voltage is output from VOUT pin, with above-mentioned the VDD output voltage being subjected to a step-down operation by a linear regulator. This step-down operation will now be explained with reference to FIG. A. The step-down operation is an operation for regulating the VDD output voltage by Pch Tr by comparing Vref2 and the VDD output voltage. VIN : Input Voltage VDD0: VDD Set Voltage VOUT0: VOUT Set Voltage Vf : ON Voltage of Diode Area A VDD0 VDD Area B VOUT VDD0+Vf 1.2V 10V Input Voltage (V) VOUT0 FIG. B Output Voltage vs. Input Voltage characteristic |
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