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ACE77LE9GM+H bảng dữ liệu(PDF) 1 Page - ACE Technology Co., LTD. |
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1 / 8 page ACE77LE9 High Efficiency Low Noise PFM Step-Up DC/DC Converter VER 1.1 1 Description The ACE77LE9 PFM step-up DC/DC Converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. It features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LEDs brightness. The fast 500kHz to 2MHz operation frequency allows for smaller capacitor and inductor. Fault condition protection uses cycle-by-cycle current limiting to sense maximum inductor current and over-voltage protection. The 0.2V low reference voltage minimizes the power loss across the current sense resistor. The converter can operate from 2V to 6V, and capable of delivering maximum 200mA output current at 4-LEDs application with 3V input voltage. Quiescent current drawn from power source is as low as 120uA. All of these features make ACE77LE9 be suitable for the portable devices, which are supplied by a single battery. Features Up to 24V Output Voltage Wide Operation Range: 2V to 6V Maximum 2MHz Operating Frequency PWM Dimming Control Shutdown Current <1μA Current Limit Cycle-by-Cycle Low Current Sense Threshold: 200mV 24V Over Output Voltage Protection Compact SOT23-6 Package Application Compact Back Light Module Power Source for LED Constant Current Source Absolute Maximum Ratings Symbol Parameter Value Unit V IN Supply Voltage on VIN -0.3 to 8.0 V V CE Voltages on Pin CE -0.3 to VIN+0.3 V I LX LX Pin Output Current 1.6 A V LX LX Pin Voltage 24 V P D Continuous Power Dissipation 250 mW T A Operating Ambient Temperature -40 to 85 °C T J Operating Junction Temperature 125 °C T STG Storage Temperature Range -40 to 150 °C T L Maximum Lead Temperature for Soldering 10 Seconds 260 °C |
Số phần tương tự - ACE77LE9GM+H |
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Mô tả tương tự - ACE77LE9GM+H |
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