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參數資料
| 型號： | R1218X |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Step-up DC/DC converter for Whilte LED Backlight |
| 中文描述： | 升壓直流/直流轉換器Whilte LED背光 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 321K |
| 代理商： | R1218X |
R1218x S ERIES
Step-up DC/DC converter for Whilte LED Backlight
NO.EA-006-1025
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 SOT23-6 and very tiny PLP1820-6.
FEATURES
1
Operating voltage............................................. 1.8V to 5.5V
Built-in 400mA, 1.5
, 20V Nch MOSFET (R1218XXX1A)
Built-in 400mA, 1.5
, 29V Nch MOSFET (R1218XXX2A)
High Frequency PWM control .......................... Oscillator Frequency 1.2MHz
Maximum Duty Cycle ....................................... Typ. 91%
Low 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(R1218X02XA)
.......................................................................... Typ. 14.0V(R1218X03XA)
.......................................................................... Typ. 18.5V(R1218X04XA)
.......................................................................... Typ. 23.0V(R1218X052A)
.......................................................................... Typ. 27.5V(R1218X062A)
LED dimming control.....................................by external PWM signal (Frequency 500Hz to 5kHz) to CE pin
.......................................................................by feedback voltage and filtered PWM signal (high frequency)
Packages.......................................................... SOT23-6 or PLP1820-6
APPLICATION
White LED Backlight for portable equipment
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相關代理商/技術參數 |
參數描述 |
|---|---|
| R1218XXX1A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for Whilte LED Backlight |
| R1218XXX2A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC converter for Whilte LED Backlight |
| R122 | 制造商:Thomas & Betts 功能描述:Weatherproof Boxes And Covers |
| R-1220 OR | 制造商:SERPAC Electronic Enclosures 功能描述:Storage Cases Body Material:Polypropyle |
| R-1220 PLL BLACK | 功能描述:CASE 28.17X22.27X15 BLK W/LOCK RoHS:是 類別:盒，外殼，支架 >> 箱 系列:R 特色產品:Customize Your Enclosure 3D 型號:EN4SD16128x.stp EN4SD16128x.dxf 標準包裝:1 系列:Eclipse 容器 - 類型:盒 尺寸/尺寸:16.000" L x 12.000" W（406.40mm x 304.80mm） 高度:8.000"（203.20mm） 面積 (L x W):192"（1239cm） 設計:鉸鏈式門，蓋 材質:金屬 - 鋼 顏色:灰 厚度:16 號 特點:不銹鋼鉸鏈 額定值:IP66，NEMA 3R，4，12，UL-508 材料可燃性額定值:- 裝運信息:從 Digi-Key 運送 重量:16 磅（7.3kg） 相關產品:ESP1612-ND - PANEL STEEL SWING 16X12" WHTEPG1612-ND - PANEL STEEL 14.2 X 10.2"EP1612-ND - PANEL STEEL 14.2X10.2" WHT |
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