L8532G-S08-R

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UNISONIC TECHNOLOGIES CO., LTD L8532 Preliminary LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 8 Copyright © 2015 Unisonic Technologies Co., Ltd QW-R125-041.a 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 requirem ents 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 re ctifier are negligible since the current goes to zero prior to reactivating the main MOSFET switch. The device features a progra mmable 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 effici ency, the device features low startup current enabling fast, low loss charging of the V CC 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 dev ice is specified across a wide junction temperature range of -40°C ~125°C.  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 SOP-8

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 8  ORDERING INFORMATION Ordering Number Package Packing L8532G-S08-R SOP-8 Tape Reel  MARKING

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 8  PIN CONFIGURATION  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION

1 MFP

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.

2 COMP

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). 3 CT 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 C T voltage to an internal voltage derived from V Control. The C T pin discharges the external timing capacitor at the end of the on time cycle. 4 CS 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.

5 ZCD

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 dem agnetized, a control signal is sent to the gate drive block to turn on the external MOSFET. 6 GND This is the analog ground for the device. All bypassing components should be connected to the GND pin with a short trace length.

7 DRV

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 V CC(on) is not reached.

8 V CC

This pin is the positive suppl y of the controller. The circ uit starts to operate when V CC exceeds VCC(on), nominally 12V and turns off when V CCgoes below V CC(off), typically 9.5V. After startup, the operating range is 10.2V up to 20V.

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 8  BLOCK DIAGRAM

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 8  ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT MFP Voltage V MFP -0.3~10 V MFP Current I MFP ±10 mA COMP Voltage V Control -0.3~6.5 V COMP Current I Control -2~10 mA Ct Voltage V Ct -0.3~6 V Ct Current I Ct ±10 mA CS Voltage V CS -0.3~6 V CS Current I CS ±10 mA ZCD Voltage V ZCD -0.3~10 V ZCD Current I ZCD ±10 mA DRV Voltage V DRV -0.3~V CC V DRV Sink Current I DRV(sink) 800 mA DRV Source Current I DRV(source) 500 mA Supply Voltage V CC -0.3~20 V Supply Current I CC ±20 mA Power Dissipation (TA =70°C, 2.0 Oz Cu, 55 mm2 Printed Circuit Copper Clad) PD 450 mW Operating Junction Temperature Range T J -40~125 °C Maximum Junction Temperature T J(MAX) 150 °C Storage Temperature Range T STG -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 subs trate with a single layer of 650 mm 2 of 2 oz copper traces and heat spreading area.  THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 178 ° С/W

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 8  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 V CC(on) V CC Increasing 11 12 12.5 V Minimum Operating Voltage V CC(off) V CC Decreasing 8.8 9.5 10.2 V Supply Voltage Hysteresis H UVLO 2.2 2.5 2.8 V Startup Current Consumption I CC(startup) 0V<V CC <VCC(on) -200 mV 24 35 uA No Load Switching Current Consumption ICC1 CDRV=Open, 70kHz Switching, VCS =2V 1.4 1.7 mA Switching Current Consumption I CC2 70kHz Switching, V CS=2V 2.1 2.6 mA Fault Condition Current Consumption ICC(fault) No Switching, V MFP=0V 0.75 0.95 mA Overvoltage And Undervoltage Protection Overvoltage Detect Threshold V OVP/VREF V MFP= Increasing 105 106 108 % Overvoltage Hysteresis V OVP(HYS) 20 60 100 mV Overvoltage Detect Threshold Propagation Delay tOVP VMFP=2~3V ramp, dV/dt=1V/us, VMFP=VOVP to VDRV=10% 500 800 ns Undervoltage Detect Threshold V UVP V MFP=Decreasing 0.25 0.31 0.4 V Undervoltage Detect Threshold Propagation Delay tUVP VMFP=1~0V ramp, dV/dt=10V/us, VMFP=VUVP to VDRV= 10% 100 200 300 ns ERROR AMPLIFIER Voltage Reference Line Regulation VREF(line) V CC(on)+200mV<VCC<20V -10 10 mV IEA(sink) V MFP=2.6V 6 10 20 IEA(sink)OVP V MFP=1.08×VREF 20 30 40 Error Amplifier Current Capability IEA(source) V MFP=0.5V -110 -280 -350 uA VMFP=2.4~2.6V, TJ= 25°C 90 110 120 Transconductance gm VMFP=2.4~2.6V, TJ= -40~125°C 70 110 135 us Feedback Pin Internal Pull−Down Resistor RMFP V MFP=VUVP to VREF 1 10 M Ω Feedback Bias Current I MFP V MFP=2.5V 1 1.3 1.6 uA Control Bias Current I Control V MFP=0V -1 1 uA Maximum Control Voltage V EAH I Control(pullup)=10uA, VMFP=VREF 5 5.5 6 V Minimum Control Voltage to Generate Drive Pulses Ct(offset) VControl=Decreasing until VDRV is low, VCt= 0V 0.37 0.65 0.88 V Control Voltage Range V EA(DIFF) V EAH-Ct(offset) 4.5 4.9 5.3 V RAMP CONTROL Ct Peak Voltage V Ct(MAX) V COMP=open 4.775 4.93 5.025 V On Time Capacitor Charge Current Icharge VCOMP=open, VCt= 0V to VCt(MAX) 235 275 297 uA Ct Capacitor Discharge Duration t Ct(discharge) VCOMP=open, VCt=VCt(MAX) -100~500mV 50 150 ns PWM Propagation Delay t PWM dV/dt=30V/us, VCt=VControl-Ct(offset) to VDRV=10% 550 600 ns

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 8  ELECTRICAL CHARACTERISTICS (Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT ZERO CURRENT DETECTION ZCD Arming Threshold V ZCD(ARM) V ZCD=Increasing 1.25 1.4 1.55 V ZCD Triggering Threshold V ZCD(TRIG) V ZCD=Decreasing 0.6 0.7 0.83 V ZCD Hysteresis V ZCD(HYS) 500 700 900 mV ZCD Bias Current I ZCD V ZCD= 5V -2 +2 uA Positive Clamp Voltage V CL(POS) I ZCD=3mA 16 18 20 V Negative Clamp Voltage V CL(NEG) I ZCD=-2mA -0.9 -0.7 -0.5 V ZCD Propagation Delay t ZCD VZCD=2V~0V ramp, dV/dt=20V/us, V ZCD=VCD(TRIG) o VDRV= 90% 200 270 ns Minimum ZCD Pulse Width t SYNC 70 ns Maximum Off Time in Absence of ZCD Transition tstart Falling VDRV=10% to Rising, DRV=90% 75 165 300 us DRIVE ROH I source=100mA 12 20 Drive Resistance ROL I SINK=100mA 6 13 Ω Rise Time t rise 10%~90% 35 80 ns Fall Time tfall 90% to 10% 25 70 ns Drive Low Voltage V out(start) VCC=VCC(on)-200mV, Isink=10mA 0.2 V CURRENT SENSE Current Sense Voltage Threshold VILIM 0.45 0.5 0.55 V Leading Edge Blanking Duration t LEB V CS=2V, VDRV= 90%~10% 100 195 350 ns Overcurrent Detection Propagation Delay tCS dV/dt=10V/us, VCS=VILIM to VDRV= 10% 40 100 170 ns Current Sense Bias Current I CS V CS= 2 V -1 1 uA

L8532 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 8  TYPICAL APPLICATION CIRCUIT MFP VCC DRV GND ZCD UTC L8532 COMP CT CS 4 5 RZCD RSUCIN RCS COUT DOUT RL OUT2 VCC IN2+ IN2- Rb Ra RX - IN1- IN1+ OUT1 NCS1002 Rt Ry RLED RC GND CO CV Ctim CCOMP EMI FILTER AC Line Input 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.