UNISONIC TECHNOLOGIES CO., LTD UC1103 Preliminary CMOS IC HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR DESCRIPTION The UTC UC1103 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 integrates PWM controller to enhance the performance of discontinuous conduction mode (DCM) flyback converters. The UTC UC1103 operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. It also provides off-time modulation to linearly decrease PWM frequency under light-load conditions so that low standby power can be achieved. The UTC UC1103 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, VDD over voltage protection, VDD clamp, OTP, leading edge blanking, VDD under voltage lockout, etc. FEATURES * High voltage startup * ±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 * Programmable cable compensation in CV mode * Flyback topology in DCM operation * Frequency hopping to reduce system EMI SOP-8 * Driver MOSFET switch * Built-in leading edge blanking * Built-in primary winding inductance compensation * Gate output maximum voltage clamped at 15V * Cycle-by-cycle current limiting * Over voltage protection * VDD under-voltage lockout ORDERING INFORMATION Ordering Number UC1103G-S08-R UC1103G-S08-R Package SOP-8 (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 Packing Tape Reel 1 of 9 QW-R502-961.d UC1103 Preliminary MARKING PIN CONFIGURATION CMOS IC CS 1 8 HV GATE 2 7 NC VDD 3 6 GND COMR 4 5 VS PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME CS GATE VDD COMR VS GND NC HV DESCRIPTION Current sense input. Gate drive for power MOSFET. Power supply. Cable compensation. The voltage feedback from the auxiliary winding. Ground No connect High-voltage startup. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT HV Pin Input Voltage VHV 500 V Supply Voltage VDD 30 V Voltage at VS, CS, COMR to GND -0.3~7.0 V Power Dissipation (TA<50°C) PD 660 mW Operating Ambient Temperature TA -40~+105 °C Operating Junction Temperature TJ -40~+150 °C Storage Temperature Range TSTG -55~+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 RESISTANCES CHARACTERISTICS PARAMETER Junction to Ambient Junction to Case SYMBOL θJA θJC RATINGS 150 39 UNIT °C/W °C/W ELECTRICAL CHARACTERISTICS (VDD=15V, TA=25°C, unless otherwise specified) PARAMETER SUPPLY SECTION Turn-on Threshold Voltage Turn-off Threshold Voltage VDD OVP Protection Operating Current Green-Mode Operating Current HV START-UP SECTION Minimum Startup Voltage on HV Pin Supply Current Drawn from Pin HV Leakage Current after Startup OSCILLATOR SECTION Maximum Frequency Minimum Frequency at CCM Minimum Frequency at No-load Frequency Hopping Range Frequency Hopping Period Frequency Variation vs. VDD Deviation VOLTAGE SENSE SECTION Reference Voltage for EA Reference Voltage for CCM Max. Cable Compensation Current CURRENT SSENSE SECTION Current Sense Threshold Voltage OCP Propagation Delay Leading Edge Blank Time Soft Start Time SYMBOL VTH(ON) VTH(OFF) VDD_OVP IDD-OP IDD-GREEN VHV-MIN IHV IHV-LC fOSC-CM-MIN fOSC-N-MIN △f/freq tFHR fDV VDD=10~25V VVR VVR_CCM MIN TYP 15 8 16 9 28 1.6 1.5 VDC=100V HV=500V, VDD=VDD-OFF+1V fOSC MAX UNIT 17 10 2 50 V mA μA 53 kHz kHz Hz kHz ms % 0.6 0.5 47 ±1.5 50 13 300 ±2.0 3 1 V V V mA mA ±2.5 2 ICABLE_MAX 2.475 2.525 2.625 0.5 25 V V uA VCS tD_OC tLEB tSS 800 90 600 10 mV nS nS mS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TEST CONDITIONS 200 4 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN GATE DRIVE SECTION Output Voltage Low VOL VDD=15V, Io_sink=20mA Output Voltage High VOH VDD=15V, Io_source=20mA 5 Rising Time tR CL=1nF Falling Time tF CL=1nF Output Clamp Voltage VCLAMP VDD=25V OTP SECTION Threshold Temperature of OTP (Note) TOTP Note: When the over-temperature protection is activated, the power system enters auto restart disabled. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP MAX UNIT 1.5 200 60 16 250 100 18 V V nS nS V +150 °C mode and output is 5 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC OPERATION DESCRIPTION The UTC UC1103 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. The device integrates PWM controller to enhance the performance of discontinuous conduction mode (DCM) flyback converters. High-Voltage Startup control The HV pin of UTC UC1103 is connected to the line input through a resistor (100K is recommended). During startup, the internal startup circuit in UTC UC1103 is enabled. Meanwhile, line input supplies a constant current to charge the hold-up capacitor through the resistor. When the VDD voltage reaches VTH(ON), the internal startup circuit is disabled and the IC turns on. Operating Current The operating current of UTC UC1103 is as low as 1.6mA. 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 UC1103 captures the auxiliary winding feedback voltage at VS pin and operates in constant-voltage (CV) mode to regulate the output voltage. The auxiliary voltage reflects the output voltage is given by: N VAUX = A ×（VO + ∆V） (1) NS Where △V indicates the drop voltage of the output diode. Figure2. Auxiliary voltage waveform Via a resistor divider connected between the auxiliary winding and VS, the VAUX is sampled at the Tsampling end and it is hold until the next sampling. The sampled voltage is compared with 2.5V reference voltage and the error is amplified. The error amplifier output reflects the load condition and controls the Toff time and the Ipk to regulate the output voltage, thus constant output voltage can be achieved. Constant Current Operation When the sampled voltage is below 2.5V reference voltage and the error amplifier output reaches its maximum, thus UTC UC1103 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 6 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC OPERATION DESCRIPTION(Cont.) Figure3. Adjustable output power by changing Rcs Figure4. Secondary current waveform In CC operation, the CC loop control function of UTC UC1103 will keep a fixed proportion between secondary inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is Tdemag 1 = Tsw 2 (2) 1 NP Tdemag 1 NP × × Ipk × = × × Ipk 2 NS Tsw 4 NS (3) Thus the output current is given by: Iout = Programmable Cable Drop Compensation UTC UC1103 has a built-in cable voltage drop compensation to achieve good load regulation. An offset voltage is generated at VS pin by an internal current flowing into the resistor divider. The current is inversely proportional to the voltage of COMR pin. As a result, it is inversely proportional to the output load current. The voltage drop across the cable is compensated by this offset voltage at VS pin. It can also be programmed by adjusting the resistance of the divider to compensate the drop for various cable lines used. Current Sensing and Leading Edge Blanking Cycle-by-cycle current limiting is offered in UTC UC1103. 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC OPERATION DESCRIPTION(Cont.) Gate Output The UTC UC1103 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 15V to protect power MOSFET transistors against undesired over-voltage gate signals. Protection Control Good power supply system reliability is achieved with its comprehensive protection features including VDD over-voltage protection, VDD Clamp, GATE Clamp, Power on soft start, Cycle-by-cycle current limiting, short circuit protection, leading edge blanking, OTP and UVLO, etc. VDD is supplied by transformer auxiliary winding output. The output of UTC UC1103 is shutdown when VDD drops below VTH(OFF) and the power converter enters power on start-up sequence thereafter. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 9 QW-R502-961.d UC1103 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT (5V/2.4A) BOM Reference BD1 L1 C1 C2 C3 C4 C5 C6 D4, D5 D6 Component BD 2A/600V Choke EC 10μF/400V 105°C EC 10μF/400V 105°C CC 1nF/1000V 1206 EC 22μF/50V 105°C CC 68nF/50V 0805 EC 1500μF/10V 105°C Diode UTC 1N4007 Diode UTC MGBR10L45C Reference R1 R2 R7 R8 R9 R10 T1 F1 Q1 Component R 200kΩ 1206 ±5% R 2.4kΩ 1206 ±5% R 39kΩ 0805 ±1% R 10kΩ 0805 ±1% R 1Ω 1206 ±5% R 100kΩ 1206 ±5% RM-6 FUSE 1A 250VAC N-channel UTC 6N60L 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 9 of 9 QW-R502-961.d