RICOH RP502x SERIES handbook(1)
Update: 30 September, 2023
The RP502x series of synchronous rectifier step-down DC/DC converters are based on the CMOS process. They contain an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a soft-start circuit, protection circuits, an UVLO circuit, and switching transistors. Using built-in switch transistors for synchronous rectification, a high-efficiency step-down DC/DC converter is composed of only an inductor and capacitors. As protection circuits, the ICs contain a current limit circuit and a latch protection circuit. The current limit circuit controls the peak current of LX at each clock cycle. If the load current exceeds the limit value for a certain period of time, the latch protection circuit maintains the built-in driver in OFF state. To cancel the latch protection, disable the ICs with a chip enable circuit and then enable it again, or make the power supply voltage lower than UVLO. The setting voltage for the RP502x series is the output voltage fixed type with built-in feedback resistance that is adjustable in 0.1V step with the accuracy of ± 1.5% or ±24mV. The packages for the ICs are WLCSP-6-P2 and DFN1616-6, which enable the high-density mounting. The switching mode for the ICs is selectable from the PWM/VFM auto switching type, which achieves the high efficiency at the light load condition or PWM fixed type, which switches at the fixed frequency.
Brand: RICOH
File format: PDF
Size: 1226 KB
MD5 Checksum: 2155EA392AF7EAF6F14070CF17B21CBF
Publication date: 10 July, 2012
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PDF Link: RICOH RP502x SERIES handbook(1) PDF