UNISONIC TECHNOLOGIES CO., LTD UPSR100 Preliminary CMOS IC HIGH PRECISION CC/CV PRIMARY SIDE REGULATOR DESCRIPTION The UTC UPSR100 is a primary control unit for switch mode charger and adapter applications. The controlled variable is transferred by an auxiliary winding from the secondary to the primary side. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The UTC UPSR100 operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. It also eliminates the need of loop compensation circuitry while maintaining stability. The UTC UPSR100 achieves high precision CV/CC regulation and high power efficiency. It offers comprehensive protection coverage with auto-recovery features including Cycle-by-cycle current limiting, output over voltage protection, feedback loop open protection, short circuit protection, leading edge blanking, VCC under voltage lockout, etc. FEATURES * ±5% constant voltage regulation at universal AC input * High precision constant current regulation at universal AC input * Primary side control without TL431 and opto-coupler * Programmable CV and CC regulation * Eliminates control loop compensation circuitry * Flyback topology in DCM operation * Random frequency modulation to reduce system EMI SOP-8 * Driver BJT switch * Built-in leading edge blanking * Built-in primary winding inductance compensation * Open circuit protection * Over voltage protection * Short circuit protection ORDERING INFORMATION Ordering Number Package Packing UPSR100G-S08-R SOP-8 Tape Reel www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 7 QW-R502-946.d UPSR100 Preliminary MARKING PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME CS VCC OUT GND FB VDD BIAS COMP CMOS IC DESCRIPTION Current sense input. Power supply. Base drive for power BJT. Ground. The voltage feedback from the auxiliary winding The 5V output of the internal voltage regulator This pin sets the bias current inside UTC UPSR100 with an external resistor to GND This pin connects a bypass capacitor BLOCK DIAGRAM VDD 6 5V VCC BIAS 7 Regulator & VREF 2 8V FB 5 4V + - OVP + - Ibias Por Logic core IREF Base drive 3 OUT 1 CS + - CV controller 0.43V LEB Tdemag detector 4 GND CC controller 8 COMP UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw + - 0.5V 2 of 7 QW-R502-946.d UPSR100 Preliminary UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw CMOS IC 3 of 7 QW-R502-946.d UPSR100 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC -0.3~30 V Voltage at CS, BIAS, OUT, VDD, COMP to GND -0.3~7 V FB Input (Pin 5) -40~10 V ESD (Machine Model) 200 V Output Current at OUT Internally limited A Power Dissipation at TA=25°C PD 0.657 W Operating Junction Temperature TJ 150 °C Storage Temperature TSTG -65~150 °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. THERMAL DATA DESCRIPTION Junction to Ambient SYMBOL θJA RATINGS 190 UNIT °C/W ELECTRICAL CHARACTERISTICS (VCC=15V, TA=25°C, unless otherwise specified.) PARAMETER SYMBOL UVLO SECTION Turn-on Threshold Voltage VTH (ON) Turn-off Threshold Voltage VTH(OFF) REFERENCE VOLTAGE SECTION BIAS Pin Voltage VBIAS VDD Pin Voltage VDD STANDBY CURRENT SECTION Start-up Current IST Operating Current IOP DRIVE OUTPUT SECTION IOUT(SINK) OUT Maximum Current IOUT IOUT(SOURCE) CURRENT SENSE SECTION Current Sense Threshold VCS Pre-Current Sense VCS(PRE) Leading Edge Blanking FEEDBACK INPUT SECTION Feedback Pin Input Leakage Current IFB Feedback Threshold VFB Enable Turn-on Voltage VFB(EN) COMP THRESHOLD VOLTAGE SECTION Turn-on Threshold Voltage VCOMP PROTECTION SECTION Over Voltage Protection VFB(OVP) TEST CONDITIONS RBIAS=200kΩ, Before Turn on TYP MAX UNIT 17.5 6.5 19 7.5 20.5 8.5 V V 1.15 4.75 1.20 5.0 1.25 5.25 V V 90 500 110 700 µA µA RBIAS=200kΩ, Before Turn on RBIAS=200kΩ RBIAS=200kΩ,VOUT<0.2V RBIAS=200kΩ VFB=4V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 50 30 mA mA 40 505 455 520 480 460 545 505 mV mV ns 11.0 3.90 -1.2 13.5 4.00 -1.0 15.0 4.10 -0.9 µA V V 3.28 3.4 3.58 V 7 8 9 V 4 of 7 QW-R502-946.d UPSR100 Preliminary CMOS IC OPERATION DESCRIPTION The UTC UPSR100 is a primary control unit for switch mode charger and adapter applications. It operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. Proprietary built-in CV and CC control can achieve high precision CV/CC performance. It uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. Startup control The voltage regulator provides the internal power supply VDD. For VCC and VDD external capacitors are required. The current biasing of UTC UPSR100 is adjustable by an external resistor. Internal time constants, thresholds and the output current depend from the value of this resistor. The startup circuit activates the IC after startup and deactivates the IC in case of UVLO. Operating Current The Operating current of UTC UPSR100 is as low as 500µA. Good efficiency and very low standby power can be achieved. Constant Voltage Operation The output voltage is defined by the transmission ratio between the secondary and auxiliary winding. The UTC UPSR100 captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to regulate the output voltage. The auxiliary voltage reflects the output voltage is given by: VAUX = NA ×（VO + ∆V） NS (1) Where △V indicates the drop voltage of the output diode. Figure 2. Auxiliary voltage waveform Via a resistor divider connected between the auxiliary winding and FB, the VAUX is sampled at the Tsampling end and it is hold until the next sampling. The sampled voltage is compared with 4V reference voltage and the error is amplified. The error amplifier output reflects the load condition and controls the Toff time to regulate the output voltage, thus constant output voltage can be achieved. Constant Current Operation When the sampled voltage is below 4V reference voltage and the error amplifier output reaches its maximum, thus UTC UPSR100 operates in constant-current (CC) mode. The CC point and maximum output power can be externally adjusted by external current sense resistor Rcs. The larger Rcs, the smaller CC point is, and the smaller output power becomes. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 7 QW-R502-946.d UPSR100 Preliminary CMOS IC OPERATION DESCRIPTION Figure 3. Adjustable output power by changing RCS Figure 4. Secondary current waveform In CC operation, the CC loop control function of UTC UPSR100 will keep a fixed proportion between secondary inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is Tdemag 4 = Tsw 7 (2) Thus the output current is given by: Iout = 1 NP Tdemag 2 NP × × Ipk × = × × Ipk 2 NS Tsw 7 NS (3) Current Sensing and Leading Edge Blanking Cycle-by-cycle current limiting is offered in UTC UPSR100. 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 500ns leading-edge blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer needed. Drive BJT The driver is a push pull stage with the supply voltage VCC. It provides the driving current for the external power bipolar transistor. The output signal is current-limited to IOUT(SOURCE). Protection Control Good power supply system reliability is achieved with its comprehensive protection features including output over-voltage protection, feedback loop open protection, Cycle-by-cycle current limiting, short circuit protection, leading edge blanking and UVLO, etc. VCC is supplied by transformer auxiliary winding output. The output of UTC UPSR100 is shutdown when VCC drops below VTH(OFF) and the power converter enters power on start-up sequence thereafter. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R502-946.d UPSR100 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT L Is Vo + NS NP N D1 + Co Io VCC FB UTC OUT UPSR100 CS COMP VDD GND BIAS NA Q1 Rcs A typical flyback application by UTC UPSR100 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 7 of 7 QW-R502-946.d