PWM/VFM Step-down DC/DC Converter

The R1224N Series are CMOS-based PWM Step-down DC/DC Converter controllers with low supply current. Each of these ICs consists of an Oscillator a PWM control circuit, a reference voltage unit, an error Amplifier a phase compensation circuit, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, resistors for output voltage detect, and input voltage detect circuit. A low ripple, high efficiency Step-down DC/DC converter CAN be easily composed of this IC with only several external components, or a power-transistor, an inductor, a Diode and capacitors. Output Voltage is fixed or CAN be adjusted with external resistors (Adjustable types are without PWM/VFM alternative circuit). With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching into the VFM Oscillator from PWM Oscillator Therefore, the efficiency at small load current is improved. Several types of the R1224Nxxx, which are without a PWM/VFM alternative circuit, are also available. If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. The protection circuit is Reset-type protection circuit, and it works to restart the operation with soft-start and repeat this operation until maximum duty cycle condition is released. When the cause of large load current or something else is removed, the operation is automatically released and returns to normal operation. Further, built-in UVLO function works when the input voltage is equal or less than UVLO threshold, it makes this IC be standby and suppresses the consumption current and avoid an unstable operation.
By RICOH Co.,Ltd.
R1224N 's PackagesR1224N 's pdf datasheet
R1224N102G
R1224N122G
R1224N102H
R1224N122H
R1224N132H
R1224N152H
R1224N182H
R1224N252H
R1224N302H
R1224N332H
R1224N362H
R1224N402H
R1224N462H
R1224N472H
R1224N502H
R1224N552H
R1224N602H
R1224N122F
R1224N152F
R1224N182F
R1224N252F
R1224N262F
R1224N302F
R1224N322F
R1224N332F
R1224N362F
R1224N502F
R1224N552F
R1224N602F
R1224N102M
R1224N122M
R1224N152M
R1224N182M
R1224N252M
R1224N302M
R1224N312M
R1224N332M
R1224N502M
R1224N552M
R1224N602M
R1224N122
R1224N152
R1224N182
R1224N252
R1224N302
R1224N312
R1224N332
R1224N502
R1224N552
R1224N602
R1224N152G
R1224N182G
R1224N252G
R1224N302G
R1224N332G
R1224N362G
R1224N402G
R1224N502G
R1224N552G
R1224N602G
R1224N122E
R1224N152E
R1224N182E
R1224N222E
R1224N252E
R1224N262E
R1224N272E
R1224N302E
R1224N332E
R1224N502E
R1224N552E
R1224N602E




R1224N Pinout, Pinouts
R1224N pinout,Pin out
This is one package pinout of R1224N,If you need more pinouts please download R1224N's pdf datasheet.

R1224N Application circuits
R1224N circuits
This is one application circuit of R1224N,If you need more circuits,please download R1224N's pdf datasheet.


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