RICOH R1224N Series 18.5V Input PWM/VFM Step-down DC/DC Controller with Ext. Tr Manual

The R1224N Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and adjustable output voltage with an external resistor is also available. The reset type protection circuit embedded into the device limits output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224N also includes an under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the UVLO detect voltage and reduces supply current.

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Brand: RICOH

File format: PDF

Size: 192 KB

MD5 Checksum: D60459C2D8E84887446FCC48746CA946

Publication date: 10 July, 2012

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PDF Link: RICOH R1224N Series 18.5V Input PWM/VFM Step-down DC/DC Controller with Ext. Tr Manual PDF