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裕鼎祥科技让电源设计更便捷可靠|联系电话：13928434054 |
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裕鼎祥科技让电源设计更便捷可靠|联系电话：13928434054 |
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RT9300是一款用于白光LED驱动的高性能的低压差电流源，可以作为传统白光LED驱动设计中镇流电阻的替代产品使用。RT9300比镇流电阻更具有优势，体现于：超低压差、恒定电流，受电压变化影响小，更小的体积，更高的效率。RT9300适合应用于由电池供电直接驱动白光LED的场合。RT9300通过内置电阻来设置四个LED的输出电流，能在2.5v～6v的电压范围内提供稳定的四路20mA电流，相互之间的匹配度高达3%，而仅需要60mv的跌落电压。产品特点:四路输出,每路20mA电流超低压,20mA时仅有60mV压差高精度3%电流匹配2.5V-6V宽电压输入范围PWM亮度控制温度保护功能
| RT9300A/B General Description |
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The RT9300A/B low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. The RT9300A/B uses an internal resistor to set the bias current for four LEDs, which are matched to 5%. The RT9300A/B's advantages over ballast resistors include much lower bias variation with supply voltage variation, significantly lower dropout voltage, and in some applications, significantly improved efficiency. The RT9300A/B requires only a 60/45mV dropout voltage at a 20/15mA load on each output to match the LED brightness. |
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RT9300A/B Ordering Info |
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Note : |
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RT9300A/B Features |
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• Low 60/45mV Dropout at 20/15mA
• 5% LED Current Matching • Simple LED Brightness Control • 2.5V to 5.5V Supply Voltage Range • Thermal Shutdown Protection • RoHS Compliant and 100% Lead (Pb)-Free |
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RT9300A/B Application |
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• Next-Generation Wireless Handsets
• PDAs, Palmtops, and Handy Terminals • Digital Cameras, Camcorders • Battery-Powered Equipment |
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RT9300A/B Pin Configurations |
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(TOP VIEW)
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RT9300A/B Typical Applications Circuit |
 Figure 1. Application Circuit for Backlight
 Figure 2. Application Circuit for Keypad.
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