- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄299836 > R1218K042A-TR (RICOH COMPANY LTD) 1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, DSO6 PDF資料下載
參數(shù)資料
| 型號(hào)： | R1218K042A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, DSO6 |
| 封裝： | 1.80 X 2 MM, PLP-6 |
| 文件頁(yè)數(shù)： | 1/22頁(yè) |
| 文件大?。?/td> | 669K |
| 代理商： | R1218K042A-TR |
當(dāng)前第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)
R1218x SERIES
Step-up DC/DC converter for White LED Backlight
NO.EA-166-080407
1
OUTLINE
The R1218x Series are PWM control type step-up DC/DC converter ICs with low supply current.
The R1218x is fully dedicated to drive White LED with constant current. Each of these ICs consists of an
NMOS FET, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, an under voltage
lockout circuit (UVLO), an over-voltage protection circuit (OVP), and so on.
The R1218x can drive white LEDs with high efficiency with low supply current. A diode is built-in the
R1218xxx1A, therefore it is possible to drive up to 4LEDs without an external diode. The R1218xxx2A, an
external diode is necessary, however, up to 6 serial LEDs can be driven with the R1218xxx2A.
Constant current can be set with an external resistance value. Dimming control is possible by PWM signal for
CE pin. Feedback voltage is 0.2V, therefore power loss by current setting resistance is small and efficiency is
good. Maximum duty cycle is internally fixed, Typ. 91%. LEDs can be driven from low voltage. Protection circuits
are the current limit of Lx peak current, the over voltage limit of output, and the under voltage lockout function.
Packages are standard SOT-23-6 and very tiny DFN(PLP)1820-6.
FEATURES
Input voltage.................................................. 1.8V to 5.5V
Built-in 400mA, 1.5, 20V Nch MOSFET and diode (R1218xxx1A)
Built-in 400mA, 1.5, 29V Nch MOSFET (R1218xxx2A)
Oscillator Frequency (PWM control)............. 1.2MHz
Maximum Duty Cycle .................................... Typ. 91%
Feedback Voltage ......................................... Typ. 0.2V
UVLO Threshold Voltage .............................. Typ. 1.6V (Hysteresis Typ. 0.1V)
Lx Current limit Protection............................. Typ. 700mA
Over Voltage Protection (OVP) Threshold.... Typ. 9.5V (R1218x021A)
Typ. 14.0V (R1218x031A)
Typ. 18.5V (R1218x041A)
Typ. 23.0V (R1218x052A)
Typ. 27.5V (R1218x062A)
LED dimming control..................................... by external PWM signal (Frequency 200Hz to 5kHz) to CE pin
by feedback voltage and filtered PWM signal (high frequency)
Packages ...................................................... SOT-23-6, DFN(PLP)1820-6
APPLICATION
White LED Backlight for portable equipment
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| R1223N3.62E-TL | Analog IC |
| R1223N3.62E-TR | Analog IC |
| R1223N3.62F-TL | Analog IC |
| R1223N3.62F-TR | Analog IC |
| R1223N3.62G-TL | Analog IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R1218K052A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218K062A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218N021A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218N022A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218N031A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。