Maker : YOBON TECHNOLOGIES
Part No. : YB1522

  Datasheet PDF : YB1522.pdf
  Cross Reference : YB1522 Cross Reference
  Buy Component : YB1522 Find Stock and Price

Shortcut : YB1520  YB1521  YB1522 

Product Information

www.DataSheet4U.com YB1522 Step-up DC-DC Converter White LED Driver Features Built-in Internal Switch 3V to 16V Input Range <1uA Shutdown Current High Efficiency Internal Soft Start Drives up to 3S7P to 3S10P White LEDs(VIN at 3.5V to 5V) Over Voltage Protection 30V Small 5-Lead SOT-23 Package Analog and PWM Dimming Control 100mV Low Reference Voltage Description The YB1522 is a step-up DC-DC converter; with wide input voltage range from 3V to 16V, which operates as current source to drive up to 3S7P to 3S10P (VIN at 3V to 5V). 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 YB1522 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. The YB1522 can drive up to 3S10P white LEDs from a single Li-Ion battery. At automotive (5V/12V) 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. YB1522 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. Applications 5” ~ 7” LCD Display Module White LED Backlighting Car TV Handheld and PDA Electronic Books Digital Photo Frame Typical Application Circuit Figure 1: Typical Application Circuit YB1522 Rev.1.0 www.yobon.com.tw 1 www.DataSheet4U.com YB1522 Step-up DC-DC Converter White LED Driver Pin Configuration SW GND FB 1 2 3 SOT23-5 5 4 VIN CTRL Figure 2: Pin Configuration Pin Description Table 1 Pin 1 2 3 NAME SW GND FB Description Switching Pin. This is the collector of the internal NPN power switch. Connect to inductor and diode. Minimize the metal trace area connected to this pin to reduce EMI. Ground Pin. Connect directly to local ground plane. Feedback Pin. Reference voltage is 100mV. Connect LEDs and a resistor at this pin. LED current is determined by the resistance and CTRL voltage. Shutdown Pin and Dimming Control Pin. VCTRL > 1.8V generates full-scale LED current. VCTRL < 0.4V chip is off. Switching from 0.4V to 2.0V, PWM duty cycle controls the LED current. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. 4 CTRL 5 VIN Ordering Information Order Number YB1522ST25 Package Type SOT23-5 Supplied As 3000 units Tape & Reel Package Marking Please contact sales representative YB1522 Rev.1.0 www.yobon.com.tw 2 www.DataSheet4U.com YB1522 Step-up DC-DC Converter White LED Driver Recommended Operating Conditions Operating Temperature......... -40°C to 85°C Supply Voltage............................... 3V~16V SW Voltage...........................................20V Absolute Maximum Ratings VIN..........................................................20V SW Voltage .............................................32V FB Voltage ................................................5V CTRL Voltage............................................5V Maximum Junction Temp, TJ ............... 150°C Lead Temperature (Soldering 10 sec).......300°C Electrical Characteristics Table 2 (VIN = 3.3V, CIN = 1uF, COUT = 10μF, TA=25°C, unless otherwise noted.) Description Input Voltage Range Not Switching Shutdown Feedback Voltage Switch Current Limit FB Pin Bias Current Switching Frequency Maximum Duty Cycle Minimum Duty Cycle Switch Vcesat Switch Leakage Current VCTRL for Full LED Current CTRL Pin Bias Current Over Voltage Protection Over Thermal Protection Thermal Resistance VFB ICL IB FSW DMAX DMIN VSAT ILKG VCTL ICTL OVP OTP θJA At ISW = 200mA CTRL = 0.3V Full On Full Off CTRL = 2V 40 30 160 220 1.7 0.3 20 Symbol VIN IQ VFB = 0.3V CTRL = 0V IOUT = 20mA,VOUT = 12...

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