ACT518 Rev 0, 13-Jun-14 ActiveQRTM Quasi-Resonant PWM Power Switch conventional solutions and exceeds the latest ES2.0 efficiency standard with good margin. FEATURES • Integrated Power MOSFET ACT518 integrates comprehensive protection. In case of over temperature, over voltage, short winding, short current sense resistor, open loop an d overload conditions, it would enter into auto restart mode including Cycle-by-Cycle current limiting. • CCM and Quasi-Resonant Operation • Adjustable up to 75kHz Switching Frequency • Integrated Patented Frequency Foldback Technique • • • • Integrated Patented Line Compensation • • • • Current Sense Resistor Short Protection ACT518 is to achieve no overshoot and very short rise time even with big capacitive load with the builtin fast and soft start process. Built-in Soft-Start Circuit OCP/OLP Protection 100mW Standby Power In full load condition, ACT518 is able to be designed to work in both CCM mode and DCM mode to meet different types of applications. QuasiResonant (QR) operation mode can effectively improve efficiency during DCM operation, and reduce the EMI noise and further reduce the components in input filter. Complies with Global Energy Efficiency and CEC Average Efficiency Standards ACT518SH is for application up to 10 Watt and ACT518DF is for application up to 18 Watt. Line Under-Voltage, Thermal, Output Overvoltage, Output Short Protections Transformer Short Winding Protection • SOP-8 and DIP-7 Packages Figure 1: Simplified Application Circuit APPLICATIONS • Power Supplies for Portable Media Player, DSCs, Set-top boxes, DVD players, records • Adaptors for Small home appliances • Auxiliary Power Supply for PC,LCD TV and PDP TV GENERAL DESCRIPTION ACT518 is a high performance peak current mode PWM power switch. It applies ActiveQRTM and frequency foldback technique to reduce EMI and improve efficiency. Its maximum design switching frequency is set at 75kHz. Very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit. The Idle mode operation enables low standby power of 100mW with small output voltage ripple. By applying frequency foldback and ActiveQRTM technology, The integrated power switch increases the average system efficiency compared to Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -1- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE PINS PACKING METHOD ACT518SH-T -40°C to 85°C SOP-8 8 TUBE & REEL ACT518SH ACT518DF -40°C to 85°C DIP-7 7 TUBE ACT518DF TOP MARK PIN CONFIGURATION SOP-8 ACT518SH DIP-7 ACT518DF PIN DESCRIPTIONS PIN NAME DESCRIPTION 1 CS Current Sense Pin. Connect an external resistor (RCS) between this pin and ground to set peak current limit for the primary switch. 2 FB Feedback Pin. Connect this pin to optocouplers’s collector for output regulation. 3 VDET Valley Detector Pin. Connect this pin to a resistor divider network from the auxiliary winding to detect zero-crossing points for valley turn on operation. 4 VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation. 5,6 GND Ground. 7,8 DRAIN MOSFET Drain Pin. Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -2- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 ABSOLUTE MAXIMUM RATINGSc PARAMETER VALUE UNIT -0.3 to + 650 V FB, CS, VDET to GND -0.3 to + 6 V VDD to GND -0.3 to + 28 V SOP-8 2 A DIP-7 4 A SOP-8 1.1 A DIP-7 2.9 A SOP-8 0.95 W DIP-7 1.5 W SOP-8 105 ˚C/W DIP-7 80 ˚C/W Operating Junction Temperature -40 to 125 ˚C Storage Temperature -55 to 150 ˚C 300 ˚C DRAIN to GND Continuous Drain Current, TC=25˚C Continuous Drain Current, TC=100˚C Maximum Power Dissipation Junction to Ambient Thermal Resistance (θJA) Lead Temperature (Soldering, 10 sec) c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods. ELECTRICAL CHARACTERISTICS (VDD = 14V, LM = 1.3mH, RCS = 1.65Ω, VOUT = 5V, NP = 114, NS =9, NA =23, TA = 25°C, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply VDD Turn-On Voltage VDDON VDD Rising from 0V 11.3 12.3 13.3 V VDD Turn-Off Voltage VDDOFF VDD Falling after Turn-on 6.7 7.4 8.1 V VDD Over Voltage Protection VDDOVP VDD Rising from 0V 25 VDD = 10V, before VDD Turn-on 8 Start Up Supply Current IDDST IDD Supply Current IDD V 15 µA VDD = 15V, after VDD Turn-on ,FB floating 0.6 mA IDD Supply Current at Standby IDDSTBY FB = 1.3V 0.4 mA IDD Supply Current at Fault IDDFAULT Fault mode, FB Floating 250 µA Feedback FB Pull up Resistor RFB 15 kΩ CS to FB Gain ACS 3 V/V 3 + VBE V VFB at Max Peak Current FB Threshold to Stop Switching VFBBM1 1.32 V FB Threshold to Start Switching VFBBM2 1.41 V 4.2 V 320 ms Output Overload Threshold OverLoad/Over Voltage Blanking Time TOVBLANK Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -3- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 ELECTRICAL CHARACTERISTICS CONT’D (VDD = 14V, LM = 1.3mH, RCS = 1.65Ω, VOUT = 5V, NP = 114, NS =9, NA =23, TA = 25°C, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Power Mosfet Drain Source Breakdown Voltage BVDSS Drain On Resistor RDSON VGS=0V,ID=250uA 650 VGS=10V,ID=1A,SOP-8 V 5.1 Ω VGS=10V,ID=2A,DIP-7 3.6 Ω Current Limit CS Current Limit Threshold Leading Edge Blanking Time VCSLIM 0.91 0.96 1.01 V TCSBLANK 240 300 360 ns Oscillator Maximum Switching Frequency fMAX Switching Frequency Foldback fMIN 75 kHz fMAX/3 kHz 75 % 100 mV 3.5 µs 1 µA 2 µs CS Short Detection Threshold 0.115 V CS Open Threshold Voltage 1.73 V Abnormal OCP Blanking Time 150 ns Thermal Shutdown Temperature 135 ˚C Maximum Duty Cycle FB = 2.3V+VBE DMAX 65 Valley Detection ZCD Threshold Voltage VDETTH After valley detection time window, if no valley detected, forcedly turn-on main switch Valley Detection Time Window VDET Leakage Current Protection CS Short Waiting Time Line UVLO IVDETUVLO 0.1 mA Line OVP IVDETOVP 2 mA VDET Over Voltage Protection VDETVOOVP 2.448 2.72 2.992 V VDET Vo Short Threshold VDETVOshort 0.406 0.58 0.754 V Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -4- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 FUNCTIONAL BLOCK DIAGRAM Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -5- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 FUNCTIONAL DESCRIPTION ACT518 is a high performance peak current mode PWM integrated power IC. It includes the most advance features that are required in the adaptor applications up to 12 Watt. Unique fast startup, frequency foldback, QR switching technique, accurate peak current line compensation, Idle mode, short winding protection, OCP, OTP, OVP and UVLO are included in the controller. reaction, the feedback voltage increases. When the feedback voltage reaches VFBBM2, ACT518 start switching again. Feedback voltage drops again and output voltage starts to bounds back and forward with very small output ripple. ACT518 leaves Idle mode when load is added strong enough to pull feedback voltage exceed VFBBM2. Figure 2: Idle Mode Startup Startup current of ACT518 is designed to be very low so that VDD could be charged to VDDON threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power loss yet reliable startup in application. For a typical AC/DC adaptor with universal input range design, two 1MΩ, 1/8 W startup resistors could be used together with a VDD capacitor(4.7uF) to provide a fast startup and yet low power dissipation design solution. During startup period, the IC begins to operate with minimum Ippk to minimize the switching stresses for the main switch, output diode and transformers. And then, the IC operates at maximum power output to achieve fast rise time. After this, VOUT reaches about 90% VOUT , the IC operates with a ‘soft-landing’ mode(decrease Ippk) to avoid output overshoot. Vo 12V Io 0A Vfb Vfb_olp Vfb_fl Vfbbm2 Vfbbm1 Ip Ilim Ip_FL t Primary Inductor Current Limit Compensation The ACT518 integrates a primary inductor peak current limit compensation circuit to achieve constant OLP over wide line and wide inductance. Constant Voltage (CV) Mode Operation Frequency Foldback In constant voltage operation, the ACT518 regulates its output voltage through secondary side control circuit . The output voltage information is sensed at FB pin through OPTO coupling. The error signal at FB pin is amplified through TL431 and OPTO circuit. When the secondary output voltage is above regulation, the error amplifier output voltage decreases to reduce the switch current. When the secondary output voltage is below regulation, the error amplifier output voltage increases to ramp up the switch current to bring the secondary output back to regulation. The output regulation voltage is determined by the following relationship: VOUTCV R = VREF _ TL 431 × (1 + F 1 ) RF 2 When the load drops to 75% of full load level, ACT518 starts to reduce the switching frequency, which is proportional to the load current ,to improve the efficiency of the converter. ACT518’s load adaptive switching frequency enables applications to meet all latest green energy standards. The actual minimum average switching frequency is programmable with output capacitance, feedback circuit and dummy load (while still meeting standby power). Valley Switching ACT518 employed valley switching from no load to heavy load to reduce switching loss and EMI. In discontinuous mode operation, the resonant voltage between inductance and parasitic capacitance on MOSFET source pin is coupled by auxiliary winding and reflected on VDET pin through feedback network R6, R7. Internally, the VDET pin is connected to an zero-crossing detector to generate the switch turn on signal when the conditions are met. (1) where RF1 (R13) and RF2 (R14) are top and bottom feedback resistor of the TL431. No Load Idle Mode In no load standby mode, the feedback voltage falls below VFBBM2 and reaches VFBBM1, ACT518 stop switching. After it stops, as a result of a feedback Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. 2A -6- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 FUNCTIONAL DESCRIPTION CONT’D Figure 3: Valley Switching V Vdrain_gnd DC voltage Possible Valley turn on Ton t T Protection Features The ACT518 provides full protection functions. The following table summarizes all protection functions. Auto-Restart Operation ACT518 will enter into auto-restart mode when a fault is identified. There is a startup phase in the auto-restart mode. After this startup phase the conditions are checked whether the failure is still present. Normal operation proceeds once the failure mode is removed. Otherwise, new startup phase will be initiated again. To reduce the power loss during fault mode, the startup delay control is implemented. The startup delay time increases over lines. PROTECTION FUNCTIONS FAILURE CONDITION PROTECTION MODE VDD Over Voltage VDD > 25V (4 duty cycle) Auto Restart VVDET Over Voltage/No Voltage VVD > 2.72V or No switching for 4 cycles Auto Restart Over Temperature T > 135˚C Auto Restart Short Winding/ Short Diode Over Load/Open Loop Output Short Circuit VDD Under Voltage VCS > 1.72V Auto Restart IPK = ILIMIT or VFB = 3.5V + VBE for 320ms Auto Restart VDET < 0.58V Auto Restart VDD < 7.4V Auto Restart Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -7- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 Figure 4: Universal VAC Input, 5V/2A Output Adaptor Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -8- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 Table 1: ACT518 5V10W Bill of Materials ITEM REFERENCE DESCRIPTION QTY MANUFACTURER IC, ACT518, SOP-8 1 Active-Semi Capacitor, Electrolytic, 10µF/400V, 10 × 14mm 1 KSC 1 U1 2 C1,C2 3 C3 Capacitor, Ceramic,1000pF/500V,0805,SMD 1 POE 4 C4 Capacitor, Electrolytic, 6.8µF/35V, 5 × 11mm 1 KSC 5 C7,C6 Capacitor, Electrolytic, 470µF/10V, 10 × 11.5mm 2 KSC 6 C8 Capacitor, Ceramic, 0.33µF/50V,0805,SMD 1 POE 7 C9 Capacitor, Ceramic,100pF/100V,0805,SMD 1 POE 8 C5 Capacitor, Ceramic,1000pF/50V,0805,SMD 1 POE 9 BD1 Diode, Rectifier ,1000V1A, MB6S, DO-4 1 Good-Ark 10 D2,D4 Diode, Ultra Fast, RS1M,1000V/1.0A, SMD 2 Good-Ark 11 D3 Diode, Schottky, 45V/10A, SB1045S, DO-201 1 Good-Ark 12 L1 13 Bead1,2 14 L2 15 PCB1 16 F1 17 R1,2 18 R3 19 R11 20 R4,5,9 21 DM Inductor, 1.5mH, DR5 1 SoKa T6*2*3, R5 2 SoKa DM Inductor, 10µH, DR5 1 SoKa PCB, L*W*T = 48.5х29х1.6mm, Cem-1, Rev:A 1 Jintong Fusible, 1A/250V 1 TY-OHM Chip Resistor, 1MΩ, 0805, 5% 2 TY-OHM Carbon Resistor, 750kΩ, 1206, 5% 1 TY-OHM Chip Resistor, 1.5kΩ, 0805, 5% 1 TY-OHM Chip Resistor, 22Ω, 0805, 5% 3 TY-OHM R6 Chip Resistor, 51.1kΩ, 0805, 1% 1 TY-OHM 22 R7 Chip Resistor, 11.1kΩ, 0805, 1% 1 TY-OHM 23 R8 Chip Resistor, 1.65Ω, 1206, 1% 1 TY-OHM 24 R9 Chip Resistor, 0.87Ω,1W, 1% 1 TY-OHM 25 R10 Chip Resistor, 200Ω, 0805, 5% 1 TY-OHM 26 R12 Chip Resistor, 3.3kΩ, 0805, 5% 1 TY-OHM 27 R13 Chip Resistor, 10.5Ω, 0805, 1% 1 TY-OHM 28 R14 Chip Resistor, 10kΩ, 0805, 1% 1 TY-OHM 29 R17 Chip Resistor, 12kΩ, 0805, 5% 1 TY-OHM 30 T1 Transformer, LP = 1.3mH, EE16 1 31 NTC Thermistor, SC053 1 TY-OHM 32 TVS Varistor, 10471 1 TY-OHM 33 CY1 Y capacitance, 2200pF/400V,Y1 1 SEC 34 U2 Opto-coupler, PC817C CTR = 200% 1 Sharp 35 U3 Voltage Regulator, TL431A, VREF = 2.5V 1 ST Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. -9- www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 TYPICAL PERFORMANCE CHARACTERISTICS VDD ON/OFF Voltage vs. Temperature Startup Supply Current (µA) VDDON and VDDOFF (V) 11.5 10.5 9.5 8.5 VDDOFF 7.5 8 7 6 0 40 80 120 0 20 80 100 Supply Current at Idle/Fault Mode vs. Temperature Maximum Switching Frequency vs. Temperature 0.3 Fault Mode 0 20 40 60 80 100 120 120 90 ACT518-004 ACT518-003 Idle Mode 0.2 80 70 60 0 20 Temperature (°C) 40 60 80 100 120 Temperature (°C) VFB Threshold Voltage vs. Temperature VCS Voltage vs. Temperature VFB Threshold Voltage (V) 0.9 0.8 0.7 4 ACT518-006 5 ACT518-005 1.0 VCS Voltage (V) 60 Temperature (°C) 0.4 0.6 0 40 Temperature (°C) Maximum Switching Frequency (KHz) 6.5 Supply Current (mA) ACT518-002 VDDON 12.5 Startup Supply Current vs. Temperature 9 ACT518-001 13.5 OLP 3 Start Switching 2 Stop Switching 1 0 20 40 60 80 100 0 120 Temperature (°C) Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. 20 40 60 80 100 120 Temperature (°C) - 10 - www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 PACKAGE OUTLINE SOP-8 PACKAGE OUTLINE AND DIMENSIONS Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. - 11 - www.active-semi.com Copyright © 2014 Active-Semi, Inc. ACT518 Rev 0 , 13-Jun-14 PACKAGE OUTLINE DIP-7 PACKAGE OUTLINE AND DIMENSIONS Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact [email protected] or visit http://www.active-semi.com. is a registered trademark of Active-Semi. Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. - 12 - www.active-semi.com Copyright © 2014 Active-Semi, Inc.