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YB1518 Datasheet(PDF) 1 Page - YOBON TECHNOLOGIES,INC. |
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YB1518 Datasheet(HTML) 1 Page - YOBON TECHNOLOGIES,INC. |
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1 / 12 page  YB1518 Step-up DC-DC Converter White LED Driver YB1518 Rev.1.3 www.yobon.com.tw 1 Description The YB1518 is a step-up DC-DC converter ; operates as current source to drive up to 6 white LEDs(VIN at 3.0V) or 8 LEDs(VIN at 3.5V) or 9 LEDs(VIN at 3.5V) in series . 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 . The YB1518 switches at a fixed frequency of ~930KHz, allowing the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space consideration applications for cellular phone backlighting or other hand held equipment. The YB1518 can drive up to 9 white LEDs from a single Li-Ion battery. The wide input voltage range from 2.7V to 7V is ideal for portable applications with higher conversion efficiency. To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100Hz to 1KHz to the CTRL pin. YB1518 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. Typical Application Circuit Features Built-in internal switch 2.7V to 7V input range <1uA shutdown current PWM dimming control 100Hz to 1KHz Analog dimming control Internal Soft Start Drives up to 9 white LEDs(VIN at 3.5V) Over voltage protection 34V Small 5-Lead SOT-23 package 100mV Low Reference Voltage Applications LCD Display Module White LED Backlighting PDAs, GPS terminals Digital Cameras Cellular Phone Electronic Books Portable Applications Figure 1: Typical Application Circuit |
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