SN03ACPA

SN03A High Power Factor Flyback PWM Controller Product Specification FEATURES SN03A features an internal start-up timer for stand-alone applications, an analog multiplier with for power factor correction (PFC), zero current detector (ZCD) to ensure TM operation, a current sensing comparator with built-in leading-edge blanking, and a totem pole output ideally suited for driving a power MOSFET. • • • • • • o SN03A offers great protection coverage including system VCC under voltage lockout (UVLO),VCC over voltage protection, Cycle-by-cycle current limiting, and gate drive output clamping for external power MOSFET protection. Low Start-up Current and Operating Current Cycle-by-Cycle Current Limiting Internal Leading Edge Blanking Analog multiplier for Power Factor Correction Internal Startup Timer for Stand-alone Applications Trimmed 1.5% Internal Band gap Reference Under Voltage Lockout with Hysteresis VCC over voltage protection Transition Mode (TM) Operation Totem Pole Output with High State Clamping Audio Noise Free 德 • • • • • SN03A is a high power factor flyback PWM controller special for lighting applications. 冠 GENERAL DESCRIPTION ia Single Stage High PF Flyback AC/DC SMPS LED Lighting Power en t • • lt APPLICATIONS O nB rig ht C on f id TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller COMP 2 7 GD MULT 3 6 GND CS 4 5 ZCD Ordering Information Part Number Description SN03AAP 8 Pin DIP, Pb free in Tube SN03ACP 8 Pin SOP, Pb free in Tube SN03ACPA 8 Pin SOP, Pb free in T&R -0.3 to 7V Min/Max Operating Junction Temperature Tj -40 to 150 oC Tstg Lead Temperature Min/Max Storage Temperature (Soldering, 10secs) -55 to 150 ℃ 260 ℃ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. Note: O nB rig ht C on f id Package Dissipation Rating Package RθJA (℃/W) DIP8 90 SOP8 150 50mA(source) -10mA(sink) 德 VCC Vz o 8 ia 1 Value en t FB lt Terminal Assignment In SOP8 or DIP8 Package. 冠 Absolute Maximum Ratings Symbol Parameter DC Supply VCC voltage Zero Current I_ZCD Detector Max. Current CS FB Analog inputs COMP & outputs MULT GENERAL INFORMATION ©On-Bright Electronics Confidential -2- Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller TERMINAL DESCRIPTIONS 2 COMP O 3 MULT I 4 CS I 5 ZCD I 6 7 8 GND GD VCC Description Input of error amplifier. Output of error amplifier. A feedback network is placed between FB and the COMP pin. The voltage of COMP and pin 4 generate PWM duty cycle. Input of multiplier. Connected to line voltage after bridge diodes via a resistor divider to provide sinusoidal reference voltage to the current loop. Current sense input pin. Connected to MOSFET current sensing node. Zero Current Detection input. When activated, A new switching cycle starts. Ground pin Gate driver output. Drive power MOSFET. DC supply voltage. id I/O I on f Pin Name FB C Pin Num 1 en t ia lt o 冠 德 Marking Information O nB rig ht P O P ©On-Bright Electronics Confidential -3- Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller O nB rig ht C on f id en t ia lt o 冠 德 BLOCK DIAGRAM ©On-Bright Electronics Confidential -4- Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller ELECTRICAL CHARACTERISTICS 3 Linear Operating Range ΔVcs/ ΔVmult Gain C K Unit 15.5 16.5 17.5 V 8.0 8.8 9.6 V rig nB O ©On-Bright Electronics V 冠 38 德 Max 36.5 5 ia 2.45 60 en t Vcc=18V Open Loop 3 mA 5 7 mA 2.5 80 1.2 -6 6 4.9 2.25 2.55 V dB MHz mA mA V V 1.8 GD=1nf @ 70kHz COMP=3.6V, FB=2.4V COMP=3.6V, FB=2.6V Isource=0.5mA Isink=0.2mA -2 2 COMP=3.0V 0 to 3.5 Vmult=2.5V COMP=4.9V -10 10 V 0.95 1.1 V/V 0.28 0.36 0.44 1/V 0.94 1.0 1.06 V 200 450 ns 0.25 Izcd=2.5mA Izcd=-2.5mA 5.1 0.75 5.7 0 -3 3 45 Vcc=14.5V, Io=100mA Vcc=14.5V, Io=100mA Cl=1000pF, 10~90% Cl=1000pF, 10~90% Vcc=28V Confidential -5- V uA lt Vcc=18V V 15 o Vcc=15V ht CURRENT SENSE COMPARATOR Current Sense Reference Vcs 4 Clamp Td(H-L) 4 Delay to Output ZERO CURRENT DETECTOR Input Threshold Voltage Vzcd 5 Trigger level Vzcd_hys ZCD trigger Hysteresis Vzcd 5 Upper Clamp Voltage Vzcd 5 Lower Clamp Voltage Izcd 5 Source Current Capability Izcd 5 Sink Current Capability STARTUP TIMER Tstart Re-Start Timer Period GATE DRIVE SECTION VoL 7 Low Output Voltage VoH 7 High Output Voltage Tr 7 Rising Time Tf 7 Falling Time Voclamp 7 Output Clamp Voltage Typ Icc=5mA Vmult=from 0 to 0.5V, COMP=4.9V Vmult=1V, COMP=3.5V Output Max. Slope Min 7.7 on f Vmult Test Conditions id (TA = 25℃ if not otherwise noted) Symbol Pin Parameter SUPPLY VOLTAGE SECTION VCC under voltage UVLO(OFF) 8 lockout exit VCC under voltage UVLO(ON) 8 lockout enter Hys 8 Hysteresis VCC Zener Clamp Vz 8 Voltage Vcc_ovp 8 VCC OVP threshold SUPPLY CURRENT SECTION Icc-start 8 Start-up Current Quiescent Current, No Iq 8 Switching Icc 8 Operating Supply Current ERROR AMPLIFIER SECTION VREF 1 EA Reference Gv Voltage Gain Gb Gain Bandwidth Source Current ICOMP 2 Sink Current Upper Clamp Voltage VCOMP 2 Lower Clamp Voltage MULTIPLIER SECTION 55 V -5 10 V V V mA mA 65 us 6.3 1.5 8 80 30 16 150 70 18 V V ns ns V Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller TYPICAL PERFOMANCE CHART 6.10 9.10 5.70 8.95 4.90 4.50 20 50 Temp(℃) 80 8.50 110 140 -40 Vref(V) vs Temperature(℃ ) 0.40 2.57 en t ia 2.59 0.37 2.54 id 2.52 -40 -10 20 50 Temp(℃) on f 2.49 80 110 0.34 0.31 0.28 140 -40 -10 20 50 80 110 140 Temp(℃) V(CS) vs V(MULT) C Icc_startup(A) vs Temp(℃ ) 7.50 rig 7.00 0.8 V(CS)(V) 8.00 1.0 ht 8.50 Icc_startup(uA) 120 Muliplier Gain(V) vs Temp(℃ ) K(V) Vref(V) 0 40 80 Temperature(℃) o -10 8.65 lt -40 8.80 冠 5.30 德 UVLO(ON)(V) vs Temperature(℃ ) UVLO(ON)(V) Icc(mA) Operating curerent(A) vs Temp(℃ ) 6.50 nB 0.4 0.2 6.00 0.0 20 50 80 Temp(℃) 110 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 V(MULT)(V) O -40 -10 0.6 ©On-Bright Electronics Confidential -6- Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller over a wide dynamic range to represent an AC line free from distortion. Special efforts have been made to assure universal line applications with respect to a 90 to 264 VAC range. The multiplier output is internally clamped to 1.0V, as shown in Fig.1. OPERATIONAL DESCRIPTION SN03A is a high power factor flyback PWM controller special for lighting application. The transition mode control greatly reduces the switch turn-on loss, improves the conversion efficiency and provides very good power factor correction. • Current Sensing Comparator and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in SN03A. The switch current is detected by a sense resistor into the sense pin. An internal leading edge blanking circuit chops off the sense voltage spike at initial MOSFET on state due to Snubber diode reverse recovery so that the external RC filtering on sense input is no longer required. The current limit comparator is disabled and thus cannot turn off the external MOSFET during the blanking period. PWM duty cycle is determined by the current sense input voltage and COMP pin voltage. o 冠 德 • Startup Current and Start up Control The typical startup current of SN03A is 5uA when the VCC pin is lower than the UVLO threshold so that VCC could be charged up and start up the device. A high value, low wattage startup resistor can therefore be used to minimize the power loss during the normal operation. en t ia lt • PWM Modulator SN03A employs peak current control in flyback system with power factor correction. The PWM stage compares the COMP signal (EA output) with CS pin voltage to generate PWM duty cycle. A new PWM cycle is always triggered by the Zero Current Detection (ZCD) block, and exits whenever the CS voltage exceeds COMP voltage. • Zero Current Detection SN03A performs zero current detection (ZCD) by monitoring the voltage activity on the auxiliary windings through ZCD pin in series with an external resistor. This voltage features a flyback polarity. When the stored energy of the flyback transformer is fully released to the output, the voltage at ZCD pin decreases. When ZCD pin voltage falls below 0.25V, an internal ZCD comparator is triggered and a new PWM switching cycle is initiated following the ZCD triggering. If no zero current triggering signal is detected on ZCD pin, the “Startup Timer” block in SN03A will generate a restart signal in 55 usec (typ.) after the last PWM signal. The maximum and minimum voltage of ZCD pin is internally clamped to 5.8V and 0V respectively. nB rig ht C on f id • Error Amplifier The inverting input of the Error Amplifier (E/A) is compared to an internal reference voltage (2.5V) to determine COMP voltage. An external loop compensation network is placed between COMP and FB. COMP is subtracted by 2.5V and then is internally connected to the multiplier input, as shown in figure 1. • Gate Drive Output The output stage is designed to ensure zero cross-conduction current. This minimizes heat dissipation, increase efficiency, and enhance reliability. The output driver is also slew rate controlled to minimize EMI. The built-in 16V clamp at the gate output protects the MOSFET gate from high voltage stress. Fig.1 • O Analog Multiplier for Power Factor Correction The built-in analog multiplier output limits the MOSFET peak current with respect to the AC half wave rectified input voltage. Through controlling the CS comparator threshold as the AC line voltage traverses sinusoidally from zero to peak line voltage, the load appears to be resistive to the AC line and near to unity power factor can be achieved. In SN03A, the two inputs for the multiplier are designed to achieve good linearity ©On-Bright Electronics • Protection Controls SN03A ensures good reliability design through its good protection coverage. VCC under voltage lockout (UVLO), VCC over voltage protection(auto recovery), Cycle-by-cycle current limiting and output gate clamp are standard features provided by SN03A. Confidential -7- Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller PACKAGE MECHANICAL DATA Symbol O nB rig A A1 A2 B B1 C D E E1 e L E2 ht C on f id en t ia lt o 冠 德 8-Pin Plastic DIP ©On-Bright Electronics Dimensions In Millimeters Min Max 3.710 5.334 0.381 3.175 3.600 0.350 0.650 1.524 (BSC) 0.200 0.360 9.000 10.160 6.200 6.600 7.320 7.920 2.540 (BSC) 2.921 3.810 8.200 9.525 Confidential -8- Dimensions In Inches Min Max 0.146 0.210 0.015 0.125 0.142 0.014 0.026 0.06 (BSC) 0.008 0.014 0.354 0.400 0.244 0.260 0.288 0.312 0.1 (BSC) 0.115 0.150 0.323 0.375 Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller ht C on f id en t ia lt o 冠 德 8-Pin Plastic SOP Symbol O nB rig A A1 A2 b c D E E1 e L θ ©On-Bright Electronics Dimensions In Millimeters Min Max 1.350 1.750 0.050 0.250 1.250 1.650 0.310 0.510 0.170 0.250 4.700 5.150 3.800 4.000 5.800 6.200 1.270 (BSC) 0.400 1.270 0º 8º Confidential -9- Dimensions In Inches Min Max 0.053 0.069 0.002 0.010 0.049 0.065 0.012 0.020 0.006 0.010 0.185 0.203 0.150 0.157 0.228 0.244 0.05 (BSC) 0.016 0.050 0º 8º Datasheet OB_DOC_DS_SN03AA0 SN03A High Power Factor Flyback PWM Controller IMPORTANT NOTICE RIGHT TO MAKE CHANGES On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. lt o 冠 德 WARRANTY INFORMATION On-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. en t ia LIFE SUPPORT On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications. O nB rig ht C on f id MILITARY On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications. ©On-Bright Electronics Confidential - 10 - Datasheet OB_DOC_DS_SN03AA0