Primary Side Regulation for LED Controller with Active PFC ADT6031 GENERAL DESCRIPTION The ADT6031 is a high accuracy constant current mode primary side regulation controller for dimmable LED lighting system. The control signal comes from primary side without optical coupler to simplify application design and cost. The controller operates in BCM (Boundary conduction mode) and in a quasi-resonant mode to provides high efficiency and to ease system EMI design. The device has robust protection function such as LED open/short protection, over voltage protection, over temperature protection and Under voltage lock-out. The ADT6031 is available in SOP8 Package. FEATURES • • • • • • • • • • • APPLICATIONS Operating range up to 30V PF ≥ 0.9 LED Current accuracy ≤ ±5% 20µA Start-Up current Over voltage / LED open protection Over temperature protection Secondary catch diode open/short protection 0V~10V Dimming / PWM dimming input Line feed-forward for accuracy regulation 5V LDO Output (≤ 10mA) SOP8 package • • • • Dimmable LED lighting LED Bulb, PAR, TUBE LED Down light, Flood-light External LED driving module TYPICAL APPLICATION CIRCUIT Figure 1. Typical Application Circuit * This specifications are subject to be changed without notice Jan 29. 2014 / Preliminary 1/7 http://www.ad-tech.co.kr PSR LED Driver ADT6031 PIN CONFIGURATION 1 DIM 2 MULT 3 CS 4 ADT6031 VREG5 8 VCC 7 GD 6 GND 5 ZCD Pin No. Pin Name Description 1 VREG5 5V power supply output. A capacitor (typical 1µF) should be connected to GND. 2 DIM 3 MULT 0V~10V Dimming / PWM Dimming input Main input of the multiplier. Connected to the rectified main voltage via a resistor divider and provides the sinusoidal reference to the current loop. 4 CS Current sense input and one input of internal PWM comparator. 5 ZCD Zero Current Detection input. A negative edge triggers MOSFET’ turn on. 6 GND Ground. 7 GD 8 VCC Gate driver output. Supply voltage input. SIMPLIFIED BLOCK DIAGRAM * This specifications are subject to be changed without notice May 26. 2014 / Preliminary 2/7 http://www.ad-tech.co.kr PSR LED Driver ADT6031 ABSOLUTE MAXIMUM RATINGS (Note1) PARAMETER SYMBOL RATING UNIT Ground Voltage GND -0.3 V Power Voltage VCC -0.3 ~ 40 V Gate Driver Output OUT -0.3 ~18 V ZCD ZCD -0.7 ~ 6 V VREG5,DIM,MULT,CS -0.3 ~ 6 V Power Dissipation(Note2) PD - W Junction Temperature TJ -40 ~ 150 ℃ Storage Temperature TSTG -65 ~ 150 ℃ θJA 150 ℃/W All other pins Thermal Resistance (Note3) Note1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Note2. Junction to ambient temperature is highly dependent upon the application and board layout . The maximum allowable power dissipation can be calculated by P D (Max) = (TJ(Max) – TA)/θJA. If exceeding the maximum allowable power dissipation, the device goes to the shutdown conditions by over temperature protection. Note3. Measured on JESD51-7, 4-layer PCB Recommended Operating Conditions (Note4) Parameter Symbol Min. Typ. Max. Unit Power supply voltage VCC - 20 - V Operating temperature TOPR -40 - +85 ℃ TJ -40 - +125 ℃ Junction temperature Note4. The device is not guaranteed to function outside of its operating conditions * This specifications are subject to be changed without notice May 26. 2014 / Preliminary 3/7 http://www.ad-tech.co.kr PSR LED Driver ADT6031 ELECTRICAL CHARACTERISTICS (VCC = 20V, Ta=25°C , unless otherwise specified) Parameter Conditions Symbol Min. Typ. Max. Units VCC - 20 - V Supply Voltage Operating Range Turn-On Threshold UVLO Enable VCC-ON 16 V Turn-Off Threshold UVLO Disable VCC-OFF 10 V VCC-HYS 6 V VCC-CLAMP 35 V ISTART 20 µA Quiescent Current IQ 2.5 Operating Current ICC Hysteretic Voltage Clamp Voltage Supply Current Start Up Current mA 5 mA Current Sensing Start Up Time TSTART 100 µsec Max On time TMAX 50 µsec Min off time TMIN1 3.5 µsec Min off time (Protection) TMIN2 170 µsec Propagation delay ZCD to GD Leding Edge Banking Time TPD 50 nsec TLEB 300 nsec Gate Driver Rising Time CL=1nF TR 150 nsec Falling Time CL=1nF TF 60 nsec Output Clamp Voltage VCC =28V VGD-CLAMP Max Source Current Max Sink Current 12 V ISOURCE 50 mA ISINK 50 mA VZCD_EN 0.3 V Zero Cross Detection (ZCD) Enable Voltage Disable Voltage VZCD_DIS 1 V Hysteretic Voltage VZCD--HYS 700 mV TQUASI 200 nsec VOCP 1.5 V VOVP_VCC 30 V VOVP_ZCD 4 V TOTP 150 °C VLDO 5 V Quasi-Resonant Delay Time Protection Over Current Protection Over Voltage Protection (VCC) Over Voltage Protection (Secondary Side) Over Temperature Protection LDO Output Voltage C=1uF,Iload=1mA DIMMING 0V~10V Dimming - VLDO 10 100 % PWM Dimming - VLDO 10 100 KHz * This specifications are subject to be changed without notice May 26. 2014 / Preliminary 4/7 http://www.ad-tech.co.kr PSR LED Driver ADT6031 Functional Description General Operations The ADT6031 is a primary side offline LED driver with inherent Power Factor Correction(PFC). The LED current can be well controlled by the primary current sensing technology without secondary current sensing using opto-coupler. It provides cycle by cycle over current protection, VCC (Chip power supply) over voltage protection, LED over voltage protection and over temperature protection. In order to decrease EMI, the ADT6031 has Quasi-Resonant turn-on MOSFET technique. Startup and UVLO The VCC voltage is charged through sensing resistor from the AC line. The startup current of ADT6031 is approximately 20uA until VCC voltage is less than UVLO disable voltage ( Typical 16V). The startup time can be designed by the selection of sensing resistor and half wave rectifier which is connected to auxiliary transformer to make VCC voltage. When VCC voltage exceeds the UVLO disable level, the VCC is taken over by the auxiliary winding. <Fig.1 Operation of Startup and UVLO> slope I RS I CS CVCC <Fig.2 Waveform of startup and UVLO> * This specifications are subject to be changed without notice May 26. 2014 / Preliminary 5/7 http://www.ad-tech.co.kr PSR LED Driver ADT6031 Constant-Current Regulation In order to drive LED load, the constant-current mode is better choice to decrease LED brightness variation. The ADT6031 estimates the LED current at the primary side by ADTech constant current estimation method called TrueCurrent-I. ※ TrueCurrent-I will be described end of this document. Zero Crossing Detection (Quasi –Resonant) The hard switching technique is notorious for EMI source in the SMPS applications. The ADT6031 provides Quasi-Resonant switching by zero crossing detection block(ZCD). * This specifications are subject to be changed without notice May 26. 2014 / Preliminary 6/7 http://www.ad-tech.co.kr PSR LED Driver ADT6031 PACKAGE DIMENSTION SOP-8 * This specifications are subject to be changed without notice May 26. 2014 / Preliminary 7/7 http://www.ad-tech.co.kr