參數(shù)資料
型號(hào)： R1215D002E
廠商： Ricoh Co., Ltd.
英文描述： STEP-UP DC/DC CONTOLLER
中文描述： 升壓型DC /直流位指示
文件頁(yè)數(shù)： 1/22頁(yè)
文件大小： 448K
代理商： R1215D002E
R1215D SERIES
STEP-UP DC/DC CONTOLLER
NO.EA-134-0604
OUTLINE
1
The R1215D Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.
Each of the R1215D Series consists of an oscillator, a PWM comparator circuit, a reference voltage unit, an
error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A low
ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or
an inductor, a diode, a power MOSFET, resisters, and capacitors.
Maximum duty cycle and the soft start time are easily adjustable with external resistors and capacitors. As for
the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period, the
R1215D Series latch the external driver with its off state, or the latch-type protection circuit works.
The delay time for latch the state can be set with an external capacitor.
To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector
threshold level).
FEATURES
Input Voltage Range .......................................................1.8V to 5.5V
Two Options of Basic Oscillator Frequency....................Typ.700kHz, 1.4MHz
Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)
Maximum Duty Cycle/Soft-start time .............................Adjustable with external capacitors
High Reference Voltage Accuracy ..................................±1.5%
UVLO Threshold level.....................................................Typ.1.6V/1.79V by mask option
Small Temperature Coefficient of Reference Voltage ...Typ.±150ppm/°C
Package..........................................................................SON-8 ( t = Max. 0.9mm )
APPLICATIONS
Constant Voltage Power Source for portable equipment.
Constant Voltage Power Source for LCD and CCD.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R1215D002F 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTOLLER
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