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参数资料
| 型号： | R1218K021A-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1.80 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件页数： | 1/19页 |
| 文件大小： | 276K |
| 代理商： | R1218K021A-TR |
R1218x SERIES
Step-up DC/DC converter for White LED Backlight
NO.EA-166-100311
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, a current limit circuit,
an under voltage lockout circuit (UVLO), an over-voltage protection circuit (OVP).
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 7 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 resistor is small and efficiency is good.
Maximum duty cycle is internally fixed, Typ. 91% to 92%. 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, 1.5Ω, 20V Nch MOSFET and diode (R1218xxx1A)
Built-in 400mA, 1.5Ω, 33V Nch MOSFET (R1218xxx2A)
Oscillator Frequency (PWM control)............. 1.2MHz
Maximum Duty Cycle .................................... Typ. 91% to 92%
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)
Typ. 31.5V (R1218x072A)
LED dimming control..................................... by external PWM signal (Frequency 200Hz to 5kHz) to CE pin
by feedback voltage and filtered PWM signal (high frequency)
Packages ...................................................... DFN(PLP)1820-6, SOT-23-6
APPLICATION
White LED Backlight for portable equipment
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R1218K031A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218K041A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218K052A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218K062A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
| R1218N021A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:Step-up DC/DC converter for White LED Backlight |
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