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R1201N021A-E2-F

更新时间： 2024-11-11 20:57:31
品牌 Logo 应用领域
理光 - RICOH 开关
页数 文件大小 规格书
17页 362K
描述
Switching Regulator,

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中文翻译

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R1201N021A-E2-F 技术参数

生命周期：Obsolete包装说明：,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.84
模拟集成电路 - 其他类型：SWITCHING REGULATORBase Number Matches：1

R1201N021A-E2-F 数据手册

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R1201x SERIES  
STEP-UP DC/DC CONVERTER FOR WHITE LED BACK LIGHT  
NO.EA-207-130509  
OUTLINE  
The R1201x Series are PWM control type step-up DC/DC converter ICs with low supply current.  
The R1201x is fully dedicated to drive White LEDs with constant current. Each of these ICs consists of an  
NMOS FET, a forward diode, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a  
current limit circuit, an under voltage lockout circuit (UVLO), and an over-voltage protection circuit (OVP).  
The R1201x can drive white LEDs in constant current with high efficiency by using an inductor, a resistor and  
capacitors as external components. A diode is built-in; therefore it is possible to drive up to 5 serial white LEDs  
without an external diode.  
The LEDs current can be set by an external resistance value and can adjust the dimming of LEDs by CE pin  
according to the signal of PWM. 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. The oscillator frequency can be selected from 1MHz or 1.2MHz.  
It is controllable the dimming of LEDs quickly when the PWM signal (between 200Hz to 300kHz) input to CE  
pin. If the CE pin input is "L" in the fixed time (Typ. 0.5ms), the IC becomes the standby mode and turns OFF  
LEDs.  
FEATURES  
• Supply Current...........................................................Typ. 450μA (R1201xxx3A/4A)  
Typ. 500μA (R1201xxx1A/2A)  
• Standby Current.........................................................Max. 5μA  
• Input Voltage Range ..................................................1.8V to 5.5V  
• Feedback Voltage ......................................................0.2V  
• Feedback Voltage Accuracy.......................................±10mV  
• Temperature-Drift Coefficient of Feedback Voltage...±150ppm/°C  
• Oscillator Frequency..................................................Typ. 1MHz, Typ. 1.2MHz  
• Maximum Duty Cycle.................................................Typ. 91%  
• Switch ON Resistance ...............................................Typ. 1.35Ω  
• UVLO Detector Threshold..........................................Typ. 1.6V  
• Lx Current Limit Protection ........................................Typ. 700mA  
• OVP Detector Threshold............................................Select from 9.5V, 14.0V, 18.5V, 20.6V, 21.6V  
• Switching Control.......................................................PWM  
• LED dimming control..................................................by external PWM signal (Frequency 200Hz to 300kHz)  
• Packages ...................................................................DFN1616-6 (Non-promotion), SOT-23-6  
• Ceramic capacitors are recommended......................0.22μF (R1201x02xA/ 03xA/ 04xA)  
1μF (R1201x05xA)  
APPLICATION  
• White LED Backlight for portable equipment  
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