RP506K331B

RP506x Series 2 A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier NO.EA-296-130925 OUTLINE The RP506x are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier featuring 2 A*1 output current. Internally, a single converter consists of an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit, a soft start circuit, a latch type protection circuit, an under-voltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors. The RP5 06x is empl oying synchronous rectification f or imp roving the efficiency of rectificatio n by repla cing diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance but also allows a design to reduce parts count. Power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control type by inputting a signal to the MODE pin. In low output current, forced PWM control switches at fixed frequency rate in o rder to redu ce n oise. Likewi se, in low out put current, PWM/VFM auto swit ching co ntrol automati cally switches from PWM mode to VFM mode in order to achieve high efficiency. Output voltage type can be selected from an internally fixed output voltage type (RP506Kxx1A/B/D/E) or an externally adjustable output voltage type (RP506K001C/F). The output voltage of the RP506Kxx1A/B/D/E can be set by 0.1 V step and the output voltage accuracy ...