R1218 系列
用于白光LED的PWM升压DC/DC转换器
R1218 系列
用于白光LED的PWM升压DC/DC转换器
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概述
The R1218 Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current. R1218 includes an under-voltage lockout circuit (UVLO), over-voltage protection circuit (OVP). By simply using an inductor, a resistor, and a capacitor (, a diode) as external components, white LEDs can be driven with constant current efficiency. R1218Nxx1A for 2 to 4 lights contains an internal diode while R1218Nxx2A for 5 to 7 lights requires an external diode. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted by applying a PWM signal to the CE or VFB pin.
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规格
消费 输入电压范围 1.8 V to 5.5 V (6.5 V) 工作温度范围 -40°C to 85°C (125°C) 电源电流 Typ. 500 µA 待机电流 Typ. 0 µA 输出电压范围 Externally Adjustable: Max. 30 V 反馈电压 Typ. 0.2 V 反馈电压精度 ±10 mV 振荡器频率 Typ. 1.2 MHz 最大占空比 Typ. 91 to 92% 封装 SOT-23-6 保护回路/功能
TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust -
技术资料
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R1218N041A Typical Application
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R1218N072A Typical Application
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R1218N041A Efficiency vs. Output Current
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买入/样品
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线上购买
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买入/样品依赖/资料获取
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功能说明
TSD | 热关断电路 |
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ILX | LX Current Limit Function |
OCP | 过流保护 |
OVP | 过压保护 |
UVLO | 欠压锁定功能 |
OVLO | Overvoltage Lockout Protection |
Reverse | 反向电流保护电路 |
Shutdown | 关机功能 |
Soft Start | 软启动功能 |
SSCG | Spread Spectrum Clock Generator Function |
PGOOD | Power Good Output |
Auto Discharge | 自动放电功能 |
Anti-ringing | Anti-ringing Switch Function |
Sequencing | Start-up Sequencing Control |
Max Duty | 最大占空比 |
Ext. Phase | 外部可调相位补偿 |
LED Adjust | LED High-speed Dimming Control |