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YB1517 Datasheet(PDF) 1 Page - YOBON TECHNOLOGIES,INC. |
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YB1517 Datasheet(HTML) 1 Page - YOBON TECHNOLOGIES,INC. |
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1 / 10 page  YB1517 Step-up DC-DC Converter & White LED Driver YB1517 Rev.1.4 www.yobon.com.tw 1 Description The YB1517 is a Current-mode PWM step-up DC-DC converter. It can drive up to 18V in 20mA output current conditions while Vin at 3.0V and 20V at 3.5Vin. The 900 KHz switching frequency allows it to work with tiny external components, therefore minimize the footprint and cost in space consideration products. One of the major applications for YB1517 is in the dc to dc converter and OLED power supply and TFT panel power supply. When using YB1517 for white LED driving, it is not recommended to control LED brightness by applying a PWM signal to the CTRL pin, because the built-in soft-start circuit might interfere the start-up operation of YB1517 and cause lower brightness. It operates as current source to drive up to 6 white LEDs in series at 3.3V input . Series connecting of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The light intensity of these LEDs is proportional to the current passing through them . YB1517 has integrated Latched Over Voltage Protection that prevents damage to the device in case of a high impedance output due to faulty LED or open circuit caused by abnormal conditions. Features 900KHz Current-mode PWM Converter Built-in Internal Switch Adjustable Output Voltage up to 20V 2.7V to 16V Input Range <1uA Shutdown Current Internal Soft Start Drives up to 6 White LEDs Tiny Inductor and Capacitors Allowed Over Voltage Protection 30V Small 5-Lead SOT-23 Package 220mV Low Reference Voltage Green package (RoHS) available Applications LCD Display Module White LED Backlighting PDAs, GPS Terminals Digital Cameras Cellular Phone Electronic Books Portable Applications Typical Application Circuit |
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