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Single-Stage APFC Buck LED Driver

DESCRIPTION

The PT6978L is a single-stage buck controller that achieves high power factor and accurate current for LED lighting applications. Integrated 650V MOSFET to decrease physical volume. The PT6978L integrates APFC function and the high PF value is achieved by constant on -time operation mode. The PT6978L works in Quasi -Resonant switching mode, it can reduce the switching losses and improve the EMI performance. The multi -protection features of PT6978L greatly enhance the system reliability and safety. The PT6978L provides input over voltage protection, short LED protection, open LED protection, over temperature protection, cycle-by-cycle current limiting, etc.

APPLICATIONS

 GU10, E27 LED Bulb lamp.  Others Led Lighting.

FEATURES

 Integrated 650V MOSFET.  High PF≥0.9 with single stage conversion.  Real-current control technique achieves accurate constant LED current.  Quasi-Resonant switching mode to achieve low switching losses.  ±3% output current accuracy.  Excellent line regulation and load regulation.  Low start-up current: 15μA typical.  Reliable short LED and open LED protection.  System auto-restart function.  VCC over voltage protection.  VCC under voltage protection (UVLO).  Cycle by cycle current limiting.  Over temperature protection (OTP).  SOP-7 package. BLOCK DIAGRAM

PRE1.0 2 July 2014 TYPICAL APPLICATION COMP CS VCC ZCD GND DRAIN DRAIN AC input 90-264V C1 R1 PT6978L-S NP R7 C3D1

PRE1.0 3 July 2014 ORDERINFORMATION Valid Part Number Package Type Top Code PT6978L-S 7 Pins, SOP PT6978L-S PIN CONFIGURATION GND DRAIN DRAIN VCC ZCD COMP CS PT6978L-S PIN DESCRIPTION Pin Name Description Pin No. VCC Power supply pin. 1 ZCD Inductor current zero -crossing detection pin. This pin also provides over voltage protection , short circuit protection and line regulation modification function. 2 COMP Loop compensation pin. 3 CS Current sense pin. Connect the sense resistor between this pin and the GND pin. 4 DRAIN Drain of the internal power MOSFET. 5/6 GND IC Ground. 7

PRE1.0 7 July 2014 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