PT6971 LED Driver for Backlighting with Dimming DESCRIPTION PT6971 is a boost DC/DC converter with one channel constant current regulator, which provides 10mA to 30mA current for up to 8 LEDs in series. The power supply is from 4V to 15V and the max output voltage is 28V. PT6971 provides both PWM dimming and analog dimming functions. The minimum PWM dimming on time is 125ns, which means 0.25% dimming duty-cycle at 20KHz is available. PT6971 also provides much protections, such as under voltage lockout, cycle by cycle input current limit, output over voltage protection, flywheel diode open protection, feedback over voltage protection, thermal shutdown protection and so on. PT6971 operates at fixed 600KHz, allowing the use of tiny external components to save space and cost. FEATURES 4~15V Input Voltage 10mA~30mA LED Current with ±3% matching Drive Up to 8 LEDs 600kHz Switching Frequency Typical less than 1uA Standby Current 28V Output Over Voltage Protection LED Open/Short Protection Flywheel Diode Open Protection Output Short to GND Protection 20kHz 0.25% PWM Dimming Available DFN8 Package APPLICATIONS Digital Cameras Monitor Backlighting Cell Phones Monitor Backlighting PDAs, Handheld Computers Monitor Backlighting Small LCD Displays Backlighting BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan PT6971 TYPICAL APPLICATIONS ORDER INFORMATION Valid Part Number PT6971 Package Type 8 Pins, DFN（2MM*3MM） Top Code PT6971 PIN CONFIGURATION PIN DESCRIPTION Pin Name EN VIN PWM ISET FB OUT GND SW GND V1.0 Description Enable control Power supply pin PWM Dimming signal input LED Current setting terminal, connect a resistor between ISET and GND for LED Current setting. Feedback Voltage input Over Voltage Protection input Ground Switching terminal Ground 2 Pin No. 1 2 3 4 5 6 7 8 Exposed PAD August 2013 PT6971 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 7 August 2013