RS2322 High Accurate non-isolated Buck-Boost LED Driver with Active PFC DESCRIPTION The RS2322 integrates active power factor correction and works in quasi resonance mode in order to reduce the MOSFET switching losses. The multi-protection features of RS2322 greatly enhance the system reliability and safety. The RS2322 features over voltage protection, short circuit protection, cycle-by-cycle current limit, VDD UVLO and auto-restart over-temperature protection. The driver output voltage is clamped at maximal 19V to protect the external power MOSFET. The RS2322 is especially designed for non-isolated LED driver. The building in perfect current compensation function ensures the accurate output current. RS2322 has very less external components because of high integrated and simple topology. Thanks to novel power supply, RS2322 need not use transformer and it could simplify PCB design. PROTECTION FEATURES VDD 26V over-voltage protection Gate 19V clamped voltage Building in hysteresis OTP (145℃) Cycle-by-cycle current limiting Inductor anti-saturation ZCD pin short to GND ZCD pin open CS pin open LED open protection LED+ and LED- short protection FEATURES High efficiency (Reach 90%) Active Power Factor Correction (>0.9) High precision output current regulation (-3%~+3%) when universal AC input voltage (85VAC~265VAC) Lowest cost and very less component count solution Non-Isolated Buck-Boost application Need not transformer to simplify design Accurate Constant Current Output Quasi Resonance Mode for High Efficiency Support no electrolytic capacitor Programmable output current setting Tight tolerances and negligible temperature variation Frequency jittering dramatically reduces EMI, minimizes EMI filter cost Building in current compensation Building in 450nS LEB time for CS pin Audio noise free operation SOP-8 Pb free package APPLICATIONS Cell phone charger Small power adaptor LED lamp Industrial controls Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan RS2322 BLOCK DIAGRAM APPLICATION CIRCUIT Note: Diode D1 must be ultra-fast diode. V1.2 2 April 2014 RS2322 ORDER INFORMATION Device RS2322 Y Z Device Code Y is package & Pin Assignments designator : S : SOP-8 Z is Lead Free designator : P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package G: Green (Halogen Free with Commercial Standard) PIN CONFIGURATION PIN DESCRIPTION Pin Name COMP GND CS DRV VDD ZCD TM NC V1.2 Description Loop Compensation pin. Connect a compensation network to stabilize the LED driver. Reference GND. Current sense pin, a resistor sense the MOSFET current. Drive external power MOSFET. Power Supply. Zero current detection pin. A negative going edge triggers the turn on signal of the external MOSFET. Over-voltage conditions are detected through ZCD. If ZCD voltage is higher than the over-voltage-protection (OVP) threshold after a blanking time 600ns, the over-voltage condition is detected. Inside test pin. No connect 3 Pin No. 1 2 3 4 5 6 7 8 April 2014 RS2322 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 V1.2 12 April 2014