UNISONIC TECHNOLOGIES CO., LTD UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT ISOLATED, PRIMARY SIDE CONTROL LED LIGHTING DRIVER WITH ACTIVE PFC DESCRIPTION The UTC UPSL101 is a primary side control offline LED lighting controller which can achieve high power factor and accurate LED current for an isolate lighting application in a single converter. The UTC UPSL101 can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. And it integrates power factor correction function and works in transition mode for reducing the MOSFET switching losses. The LED current can be adjusted externally by the sense resistor RCS at CS pin. The UTC UPSL101 achieves high precision current along with excellent line regulation and load regulation. The UTC UPSL101 offers comprehensive protection coverage with auto-recovery features including VCC over voltage protection, LED open/short circuit protection, over temperature protection, over current protection, leading edge blanking, VCC under voltage lockout, VCC clamp, GATE clamp, etc. FEATURES * Primary-side control with single stage PFC topology * Transition mode (TM) operation to achieve high efficiency * Minimized BOM count * Cycle-by-cycle current limiting (OCP) * Selectable threshold of OCP * High current accuracy * VCC over voltage protection * Analog multiplier for power factor correction SOP-8 * Over-temperature protection * Output over voltage protection * LED open circuit protection * LED short circuit protection * Soft-start * Ultra-low start-up current * VCC under voltage lockout (UVLO) ORDERING INFORMATION Ordering Number UPSL101G-S08-R Package SOP-8 Packing Tape Reel UPSL101G-S08-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) S08: SOP-8 (3)Green Package (3) G: Halogen Free and Lead Free www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 8 QW-R125-027.b UPSL101 Preliminary MARKING PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT ZCD 1 8 VCC OCP_TH 2 7 GATE MULT 3 6 GND COMP 4 5 CS PIN DESCRIPTION PIN NO. PIN NAME 1 ZCD 2 OCP_TH 3 MULT 4 COMP 5 6 7 8 CS GND GATE VCC DESCRIPTION Zero current detection pin. A negative going edge triggers the turn on signal of the external MOSFET, connected this pin through a resistor divider from the auxiliary winding to GND. If ZCD voltage is higher than the over voltage protection (OVP) threshold, the over voltage condition is detected. OCP threshold level selecting pin. Connected an external resistor to ground to select the OCP threshold voltage. One of the input pin of the internal multiplier. Connected this pin to the tap of resister divider from the line voltage. The half waves sinusoid signal in this pin is provided a reference signal for the internal current control loop. Loop compensation pin. Connect a compensation network to stabilize the LED driver and achieve a constant LED driver current. Current sense input pin. The MOSFET current is sensed via a resister. Ground pin. Gate drive output pin. DC supply voltage pin. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R125-027.b UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM Regulator & VREF VCC 4V Por OVP Soft drive GATE Logic core LEB ZCD Tdemag OCP_TH PWM CS Ipk MULT 0.4V COMP UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw GND 3 of 8 QW-R125-027.b UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT VCC Input Voltage to GND -0.3~30 V GATE to GND -0.3~30 V I/O (Except GATE) to GND -0.3~7 V Operating Ambient Temperature TA -20~85 °C Junction Temperature TJ -40~150 °C Storage Temperature TSTG -55~150 °C Lead Temperature (10 Sec) TL 260 °C Note: 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. RECOMMENDED OPERATING RANGE PARAMETER SYMBOL VCC Voltage RATINGS 11~25 UNIT V ELECTRICAL CHARACTERISTICS (VCC=16V, TA=25°C, if not otherwise noted.) PARAMETER Supply Voltage Section Standby Current Static Current VCC Under Voltage Lockout Enter VCC Under Voltage Lockout Exit VCC Clamp Protection VCC Over Voltage Protection Current Sense Section Lead Edge Blanking Time SYMBOL I_VCC_ST I_STATIC UVLO(ON) UVLO(OFF) VCC_CLAMP VCC_OVP Td_OC Source Current of OCP_TH PIN IOCP_TH Threshold Voltage of Over Current Protection VTH_OCP Output Max. Slope Gain ZCD Section Output Over Voltage Protection ZCD Low Voltage Detection When ZCD Rise up This Voltage, Demagnetization Began When ZCD Drop Below This Voltage, Demagnetization Finished VCC=14V VCC=16V, No Switching VCC Falling VCC Rising VMULT ∆VCS/∆VMULT K VOVP VZCD_LOW From OCP Comparator to Gate Drive VCC=16V 0V<VOCP_TH<0.3V 0.3V<VOCP_TH<1.5V VOCP_TH>1.5V TYP MAX UNIT 7 13.6 0.2 4.0 8 14.6 30 28 15 5.5 9 15.6 μA mA V V V V 27 20 ns 300 ns 38 2.1 1.8 1.5 49 μA V V V COMP=3V MULT=From 0 to 0.5V, COMP=4V MULT=1V, COMP=2.2V 0~3 0.6 0.75 0.9 1/V 1μs Delay After Turn Off 3.8 4 0.9 4.2 V V V 1.5 V/V VTH_DEM_H 0.9 V VTH_DEM_L 0.12 V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN T_LEB OCP Propagation Delay Multiplier Section Linear Operating Range TEST CONDITIONS 4 of 8 QW-R125-027.b UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (Cont.) PARAMETER Gm amplifier section EA Reference Voltage EA Transconductance Gain DC Gain Dynamic Range Upper Clamp Voltage Lower Clamp Voltage EA Maximum Source Current EA Maximum Sink Current Watch Dog Section Re-start Timer Period Minimum Off Time Maximum On Time OTP Section Over Temperature Protection Gate Drive Output Section Output Low Level Output High Level Output Clamping Voltage Rising Edge Time Falling Edge Time SYMBOL TEST CONDITIONS VREF GM GAIN VOUT VCOMP_H VCOMP_L ISOURCE_Max ISINK_Max TYP MAX UNIT 394 400 100 45 406 1 100 35 mV μS dB V V V μA μA 50 2 44 μs μs μs 35 1.2~4.5 6 TOFF_Max TOFF_ Min TON_Max OTP_ON VOL VOH VCLAMP TR TF 120 VCC=16V @ IOUT=100mA VCC=16V @ IOUT=100mA VCC=28V CL=1nF, 10~90% CL=1nF, 10~90% UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 140 160 °C 2.5 V V V nS nS 8 30 20 16 150 70 5 of 8 QW-R125-027.b UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT FUNCTION DESCRIPTION The UTC UPSL101 is a primary side control offline LED lighting controller which can achieve high power factor and accurate LED current for an isolate lighting application in a single converter. The UTC UPSL101 can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. And it integrates power factor correction function and works in transition mode for reducing the MOSFET switching losses. The principle of operation can be understood by referring to the block diagram. Startup The VCC pin of UTC UPSL101 is connected to the line input through a resistor. A large value startup resistor can be used to minimize the power loss in application because the start current of UTC UPSL101 is very low. When the VCC voltage reaches UVLO(OFF), the internal startup circuit is disabled and the IC turns on. Operating Current The operating current of UTC UPSL101 is as low as 1.5mA. Good efficiency and very low standby power can be achieved. Transition Mode Operation During the external MOSFET on time, the rectified input voltage is applied across the primary side inductor and the primary current increases linearly from zero to the peak value. When the external MOSFET turns off, the energy stored in the inductor forces the secondary side diode to be turn on, and the current of the inductor begins to decrease linearly from the peak value to zero, this decreasing is also reflected on the auxiliary winding. UTC UPSL101 performs zero current detection (ZCD) through ZCD pin by monitoring the voltage activity on the auxiliary windings in series with external resistors. When ZCD pin voltage falls below 0.3V, an internal ZCD comparator is triggered and generates the turn on signal of the external MOSFET. LED Constant Current Regulation The proprietary real current control method allows the UTC UPSL101 controlling the secondary side LED current from the primary side information. The LED mean current can be calculated approximately as: N Vref ILED ≈ * 2 RCS N-Turn ratio of primary side to secondary side VREF-The reference voltage (typical 0.4V) RCS-The sensing resistor connected between the MOSFET source and GND. Current Sensing and Leading Edge Blanking Cycle-by-cycle current limiting is offered in UTC UPSL101. The switch current is detected by a sense resistor into the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A leading-edge blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer needed. PWM duty cycle is determined by the current sense voltage and the voltage at pin COMP. Threshold of OCP Selection The threshold voltage level of OCP is selected by the voltage of OCP_TH pin. The UTC UPSL101 provides the source current equal to approximately 28μA through OCP_TH pin. So the proper resistor can be connected with the OCP_TH pin to GND in order to generate the voltage needed. If OCP_TH pin is connected with 33K resistor, the threshold voltage of OCP is about 1.8V; If OCP_TH pin is connected with 110K resistor, the threshold voltage of OCP is about 1.5V; If OCP_TH pin is connected with GND directly, the threshold voltage of OCP is about 2.1V. Voltage of OCP_TH Pin 3V 0.9V 0V Connecting State of OCP_TH 110K 33K GND Threshold Voltage of OCP 1.5V 1.8V 2.1V Maximum and Minimum On-Time The minimum on-time of the system is determined by the LEB time. The IC limits the on-time to a maximum time of approximately 50μs. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R125-027.b UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT FUNCTION DESCRIPTION (Cont.) Maximum Frequency Clamp According to Transition Mode (TM) Operation principle, the switching frequency is inversely proportional to the output power. Therefore, when the output power decreases, the switching frequency can become rather high without limiting. The maximum switching frequency in UTC UPSL101 is internally limited to approximately 300kHz. Power Factor Correction The MULT pin is connected to the tap of the resistor divider from the rectified instantaneous line voltage and fed as one input of the multiplier. The output of the multiplier will be shaped as sinusoid too. This signal provides the reference for the current comparator and comparing with the primary side inductor current which sets the primary peak current shaped as sinusoid with the input line voltage. High power factor can be achieved. VCC OVP and Clamping Protection VCC is supplied with transformer auxiliary winding output. It is clamped if VCC exceeds 30V. When VCC is higher than 28V, OVP protection is triggered and GATE is shut down, so the device enters power on startup sequence thereafter. LED String Short Protection When LED string is short, the positive plateau of auxiliary winding voltage is also near zero and the ZCD voltage is low. If the voltage at ZCD pin is lower than a threshold of approximately 0.9V and lasts more than 10ms, the IC will shut down. LED String Open Protection When the LED string open circuit happens, the positive plateau of auxiliary winding voltage increases and the ZCD voltage is high. If the voltage at ZCD pin is higher than a threshold of approximately 4V, UTC UPSL101 will shut down and restart again. Thermal Shutdown UTC UPSL101 provides an on chip thermal shutdown. The IC will stop switching when the junction temperature exceeds the thermal shutdown temperature, typically 140°C. Gate Drive Output The UTC UPSL101 output stage is a fast totem-pole gate driver. Cross conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability. The output driver is clamped at 12V to protect power MOSFET transistors against undesired over-voltage gate signals. Protection Control The UTC UPSL101 offers comprehensive protection coverage with auto-recovery features including VCC over voltage protection, LED open/short circuit protection, over temperature protection, over current protection, leading edge blanking, VCC under voltage lockout, VCC clamp, GATE clamp, etc. VCC is supplied by transformer auxiliary winding output. The output of UTC UPSL101 is shutdown when VCC drops below UVLO (ON) and the power converter enters power on start-up sequence thereafter. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R125-027.b UPSL101 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT 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-R125-027.b