Datasheet > R1224N442F-TR

R1224N442F-TR

更新时间： 2024-11-11 23:31:35

品牌	Logo	应用领域
其他 - ETC		模拟IC
页数	文件大小	规格书
12页	158K
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R1224N442F-TR 数据手册

2002. Jan. 28

PWM/VFM step-down DC/DC Converter

R1224N Series

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ꢀ OUTLINE

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.

ꢀ FEATURES

ꢀ Range of Input Voltage • • • • • • • • • • • • •2.3V 18.5V

ꢀ Built-in Soft-start Function and Protection Function (Reset type protection)

ꢀ Three options of Oscillator Frequency • • • • • •180kHz, 300kHz, 500kHz

ꢀ High Efficiency • • • • • • • • • • • • • • • • • •TYP. 90%

ꢀ Output Voltage • • • • • • • • • • • • • Stepwise Setting with a step of 0.1V in the range of 1.2V to 6.0V as

fixed voltage type. Reference Voltage of Adjustable Type is 1.0V

ꢀ Standby Current • • • • • • • • • • • • • • • • •TYP. 0.0µA

ꢀ High Accuracy Output Voltage • • • • • • • • • •±2.0%

ꢀ Low Temperature-Drift Coefficient of Output Voltage • • • • • TYP. ±100ppm/°C

ꢀ APPLICATIONS

ꢀ Power source for hand-held communication equipment, cameras, video instruments such as VCRs,

camcorders.

ꢀ Power source for battery-powered equipment.

ꢀ Power source for household electrical appliances.

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与R1224N442F-TR相关器件

型号	品牌	获取价格	描述	数据表
R1224N442G-TR	ETC	获取价格	SMPS Controller
R1224N442G-TR-F	RICOH	获取价格	Switching Regulator/Controller,
R1224N442H-TR	RICOH	获取价格	Switching Controller, 0.05A, 600kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN
R1224N442H-TR-F	RICOH	获取价格	Switching Regulator/Controller,
R1224N442L-TL	RICOH	获取价格	Switching Controller, 0.05A, 216kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN
R1224N442L-TR	ETC	获取价格	SMPS Controller
R1224N442L-TR-F	RICOH	获取价格	Switching Controller, 180kHz Switching Freq-Max, CMOS, PDSO5, ROHS COMPLIANT, SOT-23, 5 PI
R1224N442L-TR-FA	RICOH	获取价格	Switching Controller, 0.05A, 216kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN
R1224N442M-TL-FA	RICOH	获取价格	Switching Controller, 0.05A, 216kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN
R1224N442M-TR	RICOH	获取价格	Switching Controller, 0.05A, 216kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN

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