PT6917 PTC | Alldatasheet

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Technical content

Single Stage APFC Flyback LED Driver

DESCRIPTION

The PT6917 is a primary side regulation single stage Flyback and PFC controller for offline LED dimming applications. It achieves high power factor and accurate constant LED current with single power stage for isolated lighting applications. The PT6917 provides accurate LED current control from primary side information. Eliminating the secondary side feedback components and the opto-coupler significantly simplifies the LED lighting system design. The PT6917 integrates PFC function and the hi gh PF value is achieved with constant on time operation. The PT6917 works in Quasi -Resonant switching mode to reduce the switching losses and improve the EMI performance. The multi -protection features of PT6917 greatly enhance the system reliability and safety. The PT6917 provides input over voltage protection, short LED protection, open LED protection, over temperature protection, cycle-by-cycle current limiting.

APPLICATIONS

 LED tube lamp  LED PAR lamp  LED ceiling lamp  Other LED lighting

FEATURES

 High PF>0.9 with single stage conversion  Compatible with analog/PWM dimming modes  Real-current control technique achieves accurate constant LED current  Primary Side Regulation eliminates secondary feedback circuit  Quasi-Resonant switching mode to achieve low switching losses  0.3V primary current sense reference voltage leads to a lower conduction loss  ±5% output current accuracy  Excellent line regulation and load regulation  Reliable short LED and open LED protection  System auto-restart function  Low start-up current: 20μA typical  VCC over voltage protection (OVP)  VCC under voltage lockout (UVLO)  Cycle by cycle primary side current limiting  Over temperature protection (OTP)  SOP-8 package BLOCK DIAGRAM

PRE1.1 2 January 2015 APPLICATION CIRCUIT AC input C1 R1 NSNP DIM1 DIM2 VCC GD COMP ZCD CS GND PT6917 R10 R11 PWM Input Fig1: PWM Input Dimming AC input C1 R1 NSNP DIM1 DIM2 VCC GD COMP ZCD CS GND PT6917 R10 R11 0-1.5V Fig2: Analog Input Dimming

PRE1.1 3 January 2015 AC input C1 R1 NSNP DIM1 DIM2 VCC GD COMP ZCD CS GND PT6917 R10 R11 Fig3: Non-Dimming

PRE1.1 4 January 2015 ORDERINFORMATION Valid Part Number Package Type Top Code PT6917-S 8-PIN, SOP PT6917-S PIN CONFIGURATION DIM1 DIM2 VCC GD COMP ZCD CS GND PT6917-S PIN DESCRIPTION Pin Name Description Pin No. COMP Loop compensation pin. 1 ZCD Inductor current zero -crossing detection pin. This pin also provides over voltage protection (OVP) and line regulation modification function. 2 CS Current sense pin. Sense the inductor current when the switch is turned on. 3 GND IC Ground. 4 GD Gate driver pin. Connect to the gate of power MOSFET. 5 VCC Power supply pin. 6 DIM2 Analog dimming input pin, also Enable/Disable pin. 7 DIM1 PWM dimming input pin. Must be connected to GND if DIM1is not for dimming. 8

PRE1.1 9 January 2015 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the ri ght 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 embodie d 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