UNISONIC TECHNOLOGIES CO., LTD L8532 Preliminary LINEAR INTEGRATED CIRCUIT POWER FACTOR CORRECTED DIMMABLE LED DRIVER DESCRIPTION The UTC L8532 is a switch mode power supply controller intended for low to medium power single stage power factor (PF) corrected LED Drivers. The device is designed to operate in critical conduction mode (CrM) and is suitable for flyback as well as buck topologies. Constant on time CrM operation is particularly suited for isolated flyback LED applications as the control scheme is straightforward and very high efficiency can be achieved even at low power levels. These are important in LED lighting to comply with regulatory requirements and meet overall system luminous efficacy requirements. In CrM, the switching frequency will vary with line and load and switching losses are low as recovery losses in the output rectifier are negligible since the current goes to zero prior to reactivating the main MOSFET switch. The device features a programmable on time limiter, zero current detect sense block, gate driver, trans-conductance error amplifier as well as all PWM control circuitry and protection functions required to implement a CrM switch mode power supply. Moreover, for high efficiency, the device features low startup current enabling fast, low loss charging of the VCC capacitor. The current sense protection threshold has been set at 500 mV to minimize power dissipation in the external sense resistor. To support the environmental operation range of Solid State Lighting, the device is specified across a wide junction temperature range of -40°C ~125°C. SOP-8 FEATURES * Very Low 24μA Typical Startup Current * Constant On Time PWM Control * Cycle-by-Cycle Current Protection * Low Current Sense Threshold of 500mV * Low 2mA Typical Operating Current * Source 500mA/Sink 800mA Totem Pole Gate Driver * Reference Design for TRIAC and Trailing Edge Line Dimmers * Wide Operating Temperature Range * No Input Voltage Sensing Requirement * Enable Function and Overvoltage Protection www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 8 QW-R125-041.a L8532 Preliminary ORDERING INFORMATION Ordering Number L8532G-S08-R LINEAR INTEGRATED CIRCUIT Package SOP-8 Packing Tape Reel MARKING UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R125-041..a L8532 Preliminary PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME 1 MFP 2 COMP 3 CT 4 CS 5 ZCD 6 GND 7 DRV 8 VCC LINEAR INTEGRATED CIRCUIT DESCRIPTION The multi-function pin is connected to the internal error amplifier. By pulling this pin below the Vuvp threshold, the controller is disabled. In addition, this pin also has an over voltage comparator which will disable the controller in the event of a fault. The COMP pin is the output of the internal error amplifier. A compensation network is connected between this pin and ground to set the loop bandwidth. Normally this bandwidth is set at a low frequency (typically 10Hz~20Hz) to achieve high power factor and low total harmonic distortion (THD). The CT pin sources a regulated current to charge an external timing capacitor. The PWM circuit controls the power switch on time by comparing the CT voltage to an internal voltage derived from VControl. The CT pin discharges the external timing capacitor at the end of the on time cycle. The CS input is used to sense the instantaneous switch current in the external MOSFET. This signal is filtered by an internal leading edge blanking circuit. The voltage of an auxiliary zero current detection winding is sensed at this pin. When the ZCD control block circuit detects that the winding has been demagnetized, a control signal is sent to the gate drive block to turn on the external MOSFET. This is the analog ground for the device. All bypassing components should be connected to the GND pin with a short trace length. The high current capability of the totem pole gate drive (+0.5/-0.8 A) makes it suitable to effectively drive high gate charge power MOSFETs. The driver stage provides both passive and active pull down circuits that force the output to a voltage less than the turn-on threshold voltage of the power MOSFET when VCC(on) is not reached. This pin is the positive supply of the controller. The circuit starts to operate when VCC exceeds VCC(on), nominally 12V and turns off when VCCgoes below VCC(off), typically 9.5V. After startup, the operating range is 10.2V up to 20V. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R125-041..a L8532 Preliminary LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 8 QW-R125-041..a L8532 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT MFP Voltage VMFP -0.3~10 V MFP Current IMFP ±10 mA COMP Voltage VControl -0.3~6.5 V COMP Current IControl -2~10 mA Ct Voltage VCt -0.3~6 V Ct Current ICt ±10 mA CS Voltage VCS -0.3~6 V CS Current ICS ±10 mA ZCD Voltage VZCD -0.3~10 V ZCD Current IZCD ±10 mA DRV Voltage VDRV -0.3~VCC V DRV Sink Current IDRV(sink) 800 mA DRV Source Current IDRV(source) 500 mA Supply Voltage VCC -0.3~20 V Supply Current ICC ±20 mA Power Dissipation PD 450 mW (TA =70°C, 2.0 Oz Cu, 55 mm2 Printed Circuit Copper Clad) Operating Junction Temperature Range TJ -40~125 °C Maximum Junction Temperature TJ(MAX) 150 °C Storage Temperature Range TSTG -65~150 °C Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. As mounted on a 40×40×1.5mm FR4 substrate with a single layer of 650 mm2 of 2 oz copper traces and heat spreading area. THERMAL DATA PARAMETER Junction to Ambient UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw SYMBOL θJA RATINGS 178 UNIT °С/W 5 of 8 QW-R125-041..a L8532 Preliminary LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS VMFP=2.4V, VControl= 4V, Ct=1nF, VCS=0V, VZCD=0V, CDRV=1nF, VCC=12V, unless otherwise specified (For typical values, TJ=25°C. For min/max values, TJ=-40°C~125°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT STARTUP AND SUPPLY CIRCUITS Startup Voltage Threshold VCC(on) VCC Increasing 11 12 12.5 V Minimum Operating Voltage VCC(off) VCC Decreasing 8.8 9.5 10.2 V Supply Voltage Hysteresis HUVLO 2.2 2.5 2.8 V Startup Current Consumption ICC(startup) 0V<VCC <VCC(on) -200 mV 24 35 uA CDRV=Open, 70kHz Switching, VCS No Load Switching Current ICC1 1.4 1.7 mA Consumption =2V Switching Current Consumption ICC2 70kHz Switching, VCS=2V 2.1 2.6 mA Fault Condition Current ICC(fault) No Switching, VMFP=0V 0.75 0.95 mA Consumption Overvoltage And Undervoltage Protection Overvoltage Detect Threshold VOVP/VREF VMFP= Increasing 105 106 108 % Overvoltage Hysteresis VOVP(HYS) 20 60 100 mV VMFP=2~3V ramp, dV/dt=1V/us, Overvoltage Detect Threshold tOVP 500 800 ns Propagation Delay VMFP=VOVP to VDRV=10% Undervoltage Detect Threshold VUVP VMFP=Decreasing 0.25 0.31 0.4 V VMFP=1~0V ramp, dV/dt=10V/us, Undervoltage Detect Threshold tUVP 100 200 300 ns Propagation Delay VMFP=VUVP to VDRV= 10% ERROR AMPLIFIER TJ=25°C 2.475 2.500 2.525 Voltage Reference VRER V TJ=-40°C~125°C 2.460 2.500 2.540 Voltage Reference Line VREF(line) VCC(on)+200mV<VCC<20V -10 10 mV Regulation IEA(sink) VMFP=2.6V 6 10 20 Error Amplifier Current uA IEA(sink)OVP VMFP=1.08×VREF 20 30 40 Capability IEA(source) VMFP=0.5V -110 -280 -350 VMFP=2.4~2.6V, TJ= 25°C 90 110 120 Transconductance gm us VMFP=2.4~2.6V, TJ= -40~125°C 70 110 135 Feedback Pin Internal RMFP VMFP=VUVP to VREF 1 10 MΩ Pull−Down Resistor Feedback Bias Current IMFP VMFP=2.5V 1 1.3 1.6 uA Control Bias Current IControl VMFP=0V -1 1 uA Maximum Control Voltage VEAH IControl(pullup)=10uA, VMFP=VREF 5 5.5 6 V VControl=Decreasing until VDRV is low, Minimum Control Voltage to Ct(offset) 0.37 0.65 0.88 V Generate Drive Pulses VCt= 0V Control Voltage Range VEA(DIFF) VEAH-Ct(offset) 4.5 4.9 5.3 V RAMP CONTROL Ct Peak Voltage VCt(MAX) VCOMP=open 4.775 4.93 5.025 V VCOMP=open, On Time Capacitor Charge Icharge 235 275 297 uA Current VCt= 0V to VCt(MAX) VCOMP=open, 50 150 ns Ct Capacitor Discharge Duration tCt(discharge) VCt=VCt(MAX) -100~500mV dV/dt=30V/us, 550 600 ns PWM Propagation Delay tPWM VCt=VControl-Ct(offset) to VDRV=10% UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R125-041..a L8532 Preliminary LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (Cont.) PARAMETER ZERO CURRENT DETECTION ZCD Arming Threshold ZCD Triggering Threshold ZCD Hysteresis ZCD Bias Current Positive Clamp Voltage Negative Clamp Voltage SYMBOL VZCD(ARM) VZCD(TRIG) VZCD(HYS) IZCD VCL(POS) VCL(NEG) ZCD Propagation Delay tZCD Minimum ZCD Pulse Width Maximum Off Time in Absence of ZCD Transition DRIVE tSYNC tstart ROH ROL trise tfall Drive Resistance Rise Time Fall Time Drive Low Voltage Vout(start) CURRENT SENSE Current Sense Voltage Threshold Leading Edge Blanking Duration Overcurrent Detection Propagation Delay Current Sense Bias Current TEST CONDITIONS VZCD=Increasing VZCD=Decreasing VZCD= 5V IZCD=3mA IZCD=-2mA VZCD=2V~0V ramp, dV/dt=20V/us, VZCD=VCD(TRIG) o VDRV= 90% tCS ICS MAX UNIT 1.25 0.6 500 -2 16 -0.9 1.4 0.7 700 18 -0.7 1.55 0.83 900 +2 20 -0.5 V V mV uA V V 200 270 ns 75 Isource=100mA ISINK=100mA 10%~90% 90% to 10% VCC=VCC(on)-200mV, Isink=10mA VCS=2V, VDRV= 90%~10% dV/dt=10V/us, VCS=VILIM to VDRV= 10% VCS= 2 V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP 70 Falling VDRV=10% to Rising, DRV=90% VILIM tLEB MIN ns 165 300 us 12 6 35 25 20 13 80 70 ns ns 0.2 V Ω 0.45 0.5 0.55 V 100 195 350 ns 40 100 170 ns 1 uA -1 7 of 8 QW-R125-041..a L8532 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT AC Line Input DOUT EMI FILTER CIN Ra RSU D1 CV Rb RX 8 RL R1 UTC L8532 1 MFP R2 CCOMP VCC VCC 8 2 COMP DRV 7 3 CT GND 6 4 CS ZCD 5 RZCD OUT2 7 5 + IN2+ - IN2- 6 NCS1002 C1 Q1 OUT1 1 + IN1+ 3 Ry GND CO Ctim COUT RCS Rt IN1- 2 4 RC RLED Simplified Flyback Application with Secondary side Constant Current Control UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 8 QW-R125-041..a