A Product Line of Diodes Incorporated AP3125B GREEN MODE PWM CONTROLLER Description Pin Assignments NEW PRODUCT The AP3125B is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters. (Top View) The PWM switching frequency at normal operation is internally fixed (about 65kHz). In middle load, the IC will enter green mode to improve system efficiency with the help of frequency foldback. A minimum switching frequency (about 20kHz) is set to avoid the audible noise. In no load or light load, the IC will enter the burst mode to minimize standby power. Furthermore, the frequency dithering function is built-in to reduce EMI emission. Pin 1 Mark Internal slope compensation allows more stable Peak-Current Mode control over wide range of input voltage and load conditions. Internal line compensation ensures constant output power limit over entire universal line voltage range. Comprehensive protection features are included, such as cycle-bycycle current limit (OCP), VCC Over Voltage Protection (VOVP), internal OTP, Over Load Protection (OLP) and pins' fault protection. Built-in Brownout (BNO) and Line Over Voltage Protection (LOVP) are also integrated in AP3125B. Features Very Low Start-up Current Current Mode Control Non-audible-noise Green-mode Control Internal Slope Compensation Soft Start During Startup Process Frequency Fold Back for High Average Efficiency Secondary Winding Short Protection with FOCP Soft Switching for Reducing EMI VCC Maintain Mode Brownout Protection (BNO) Line Over Voltage Protection (LOVP) Useful Pin Fault Protection: SENSE Pin Floating SENSE Pin Short to Ground FB/Opto-coupler Open/Short Comprehensive System Protection Feature: VCC Over Voltage Protection (VOVP) Over Load Protection (OLP) Mini Size with Packages Pin to Pin Compatible with AP3105NA/NV/NL/NR Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Notes: GND 1 6 GATE FB 2 5 VCC BNO 3 4 SENSE SOT26 Applications Switching AC-DC Adapter/Charger ATX/BTX Auxiliary Power Set-top Box (STB) Power Supply Open Frame Switching Power Supply 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AP3125B Document number: DS36659 Rev. 3 - 2 1 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Typical Applications Circuit L2 + T1 C6 R6 R4 C2 C5 R13 C7 C8 ~ - R5 ~ NEW PRODUCT R19 C4 R14 C3 NTC R2 R8 R3 VCC GATE R10 C1 R9 BNO F1 VR1 R7 R15 SENSE R20 AP3125B C10 C11 R11 R16 R12 AZ431 C20 R17 C9 FB GND R18 ~ Pin Descriptions Pin Number Pin Name 1 GND 2 FB 3 BNO 4 SENSE 5 VCC Supply voltage of driver and control circuits 6 GATE Gate driver output AP3125B Document number: DS36659 Rev. 3 - 2 Function Signal ground. Current return for driver and control circuits Feedback. Directly connected to the opto-coupler Control brownout protection Current sense 2 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Functional Block Diagram VCC 16V 7.6V 5 NEW PRODUCT 32V UVLO 28V Internal Bias VDD Auto Recovery Protection VCC_OVP OLP FOCP Line_OVP Brownout OTP VCC_OVP VCC Latch-off Protection Driver 13V 6 GATE VDD FB Soft Start 2 SS D DFF CLK RB OSC with Frequency Jitter Q 0.3V 2R GND 1 1.3V 70mS Debounce OLP 250ns LEB R SS 4 0.95V Line Compensation 4.2V 3 PWM 1.80V SENSE Line_OVP OCP FOCP Brownout 50mS Debounce 0.95V 0.9V BNO 5.5V OTP 150oC/125oC AP3125B AP3125B Document number: DS36659 Rev. 3 - 2 3 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Absolute Maximum Ratings (Note 4) Symbol Parameter VCC IO NEW PRODUCT VFB, VSENSE, VBNO Rating Unit Power Supply Voltage 30 V Gate Output Current 350 mA -0.3 to 7 V Input Voltage to FB, SENSE, BNO JA Thermal Resistance (Junction to Ambient) 250 C/W PD Power Dissipation at TA < +25C 500 mW TJ Operating Junction Temperature -40 to +150 C Storage Temperature Range +150 C - ESD (Human Body Model) 3000 V - ESD (Machine Model) 300 V TSTG Note 4: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and 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 Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Symbol VCC Parameter Supply Voltage AP3125B Document number: DS36659 Rev. 3 - 2 4 of 12 www.diodes.com Min Max Unit 10 25 V July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Electrical Characteristics (@TA = +25C, VCC = 16V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit - 1 10 A VFB=0V, CL=1nF 0.5 0.7 1 VFB=3V, CL=0nF 0.6 1.2 2.0 Supply Voltage (VCC Pin) ISTARTUP NEW PRODUCT ICC - Startup Current Operating Supply Current mA - UVLO (on) - 14.5 15.8 16.5 V - VCC Maintain - 8.6 9.1 9.6 V - UVLO (off) - 7.1 7.6 8.1 V - VCC OVP - 27 28.5 30 V - VCC Clamp ICC=5mA 31 34 - V PWM Section/Oscillator Section - Maximum Duty Cycle - 70 75 80 % - Oscillation Frequency - 60 65 70 kHz - Green Mode Frequency - 20 - 30 kHz - Frequency Temperature Stability -20C to +125C (Note 5) - - 5 % - Frequency Voltage Stability VCC=12V to 30V - - 3 % Frequency Dithering - 4 6 8 % Maximum SENSE Voltage VFB=4.5V 0.9 0.95 1 V - FOCP Voltage - 1.5 1.7 1.9 V - SENSE Shorted Protection Threshold - - 0.1 - V - LEB Time of SENSE - 150 250 350 ns - Delay to Output (Note 5) - - 100 - ns - Soft-start Time - 3 5 8 ms - 2.5 3 3.5 V/V 12 15 18 k -0.2 -0.27 -0.34 mA - Current Sense Section (SENSE Pin) VCS Feedback Input Section (FB Pin) The Ratio of Input Voltage to - Current Sense Voltage - Input Impedance - - Source Current VFB=0V - Green Mode Threshold - - 2.1 - V - Input Voltage for Zero Duty - 1.3 1.55 1.8 V - Output Low Level IO=20mA, VCC=12V - - 1 V - Output High Level IO=20mA, VCC=12V 8 - - V - Output Clamping Voltage - 11 13 15 V - Rising Time (Note 5) CL=1nF, VCC=13V - 150 250 ns - Falling Time (Note 5) CL=1nF, VCC=13V - 50 100 ns Output Section (GATE Pin) AP3125B Document number: DS36659 Rev. 3 - 2 5 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Electrical Characteristics (Cont.) (@TA = +25C, VCC = 16V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit NEW PRODUCT Brownout Section (BNO Pin) - Brown-in Voltage - 0.93 0.95 0.97 V - Brownout Voltage - 0.88 0.9 0.92 V - Clamping Voltage ICLAMP=1mA - 5.5 - V - Line OVP - 4.1 4.2 4.3 V - Delay of Short Circuit Protection - - 70 - ms - Delay of Hiccup Protection VCC OVP - 5 - Cycles - De-bounce Time of Brownout - - 50 - ms - OTP Enter - - +150 - C - OTP Exit - - +125 - C Delay Time Section Internal OTP Section Note 5: Guaranteed by design. AP3125B Document number: DS36659 Rev. 3 - 2 6 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Performance Characteristics 18 9.0 17 8.5 Shutdown Voltage (V) Startup Voltage (V) Shutdown Voltage vs. Ambient Temperature 16 15 14 8.0 7.5 7.0 13 -40 -20 0 20 40 60 80 100 120 6.5 -40 140 -20 0 o 20 40 60 80 100 120 140 o Ambient Temperature ( C) Ambient Temperature ( C) Startup Current vs. Ambient Temperature Operating Current vs. Ambient Temperature 2.0 0.9 1.8 VFB=3V, CL=0 1.6 Operating Current (mA) 0.8 Startup Current (A) NEW PRODUCT Startup Voltage vs. Ambient Temperature 1.4 1.2 1.0 0.8 0.6 0.4 0.7 0.6 0.2 0.0 -40 -20 0 20 40 60 80 100 120 140 0.5 -40 o -20 0 20 40 60 80 100 120 140 o Ambient Temperature ( C) Ambient Tempture ( C) BNO Utilization for Brownout BNO CBUCK AP3125B Document number: DS36659 Rev. 3 - 2 7 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Operation Description The AP3125B is specifically designed for off-line AC-DC power supply used in LCD monitor, notebook adapter and battery charger applications. It offers a cost effective solution with a versatile protection function. Built-in Slope Compensation It is well known that a continuous current mode SMPS may become unstable when the duty cycle exceeds 50%. The built-in slope compensation can improve the stability, so there is no need for design engineer to spend much time on that. NEW PRODUCT Start-up Current and UVLO The start-up current of AP3125B is optimized to realize ultra low current (1A typical) so that VCC capacitor can be charged more quickly. The direct benefit of low start-up current is the availability of using large start-up resistor, which minimizes the resistor power loss for high voltage AC input. An UVLO comparator is included in AP3125B to detect the voltage on VCC pin. It ensures that AP3125B can draw adequate energy from hold-up capacitor during power-on. The turn-on threshold is 16V and the turn-off threshold is 7.6V. FB Pin and Short Circuit Protection This pin is normally connected to the opto-coupler and always paralleled with a capacitor for loop compensation. When the voltage at this pin is greater than 4.5V and lasts for about 70ms, the IC will enter the protection mode. For AP3125B, the system will enter hiccup mode to wait the VCC decreasing to low UVLO level, then the IC will try to restart until the failure removed. And when this voltage is less than 1.55V, the IC will stop the drive pulse immediately. Therefore, this feature can be used for short circuit protection, which makes the system immune from damage. Normally, output short makes the VFB value to the maximum because the optocoupler is cut off. Current Sense Comparator and PWM Latch The AP3125B operates as a current mode controller, the output switch conduction is initiated by every oscillator cycle and is terminated when the peak inductor current reaches the threshold level established by the FB pin. The inductor current signal is converted to a voltage signal by inserting a reference sense resistor RS. The inductor current under normal operating conditions is controlled by the voltage at FB pin. The relation between peak inductor current (IPK) and VFB is: I PK (VFB 0.8) / 3RS Moreover, FOCP with 1.8V threshold is only about 100ns delay, which can avoid some catastrophic damages such as secondary rectifier short test. Few drive cycles can alleviate the destruction range and get better protection. Leading-edge Blanking A narrow spike on the leading edge of the current waveform can usually be observed when the power MOSFET is turned on. A 250ns leading-edge blank is built-in to prevent the false-triggering caused by the turn-on spike. During this period, the current limit comparator is disabled and the gate driver can not be switched off. At the time of turning off the MOSFET, a negative undershoot (maybe larger than -0.3V) can occur on the SENSE pin. So it is strongly recommended to add a small RC filter or at least connect a resistor "R" on this pin to protect the IC (Shown as Figure 1). 5 VCC 3 BNO GATE 6 AP3125B 1 GND Necessary R VCC Maintain Mode During light load or step load, VFB will drop and be lower than 1.55V, thus the PWM drive signal will be stopped, and there is no more new energy transferred due to no switching. Therefore, the IC supply voltage may reduce to the shutdown threshold voltage and system may enter the unexpected restart mode. To avoid this, the AP3125B hold a so-called VCC maintain mode which can supply energy to VCC. When VCC decreases to a setting threshold, the VCC maintain comparator will output some drive signal to make the system switch and provide a proper energy to VCC pin. The V CC maintain function will cooperate with the PWM and burst mode loop which can make the output voltage variation be within the regulation. This mode is very useful for reducing startup resistor loss and achieving a better standby performance with a low value VCC capacitor. The V CC is not easy to touch the shutdown threshold during the startup process and step load. This will also simplify the system design. The minimum VCC voltage is suggested to be designed a little higher than VCC maintain threshold thus can achieve the best balance between the standby and step load performance System Protection and Pin Fault Protection The AP3125B provides versatile system and pin fault protections. The OCP comparator realizes the cycle-by-cycle current limiting (OCP). In universal input line voltage, the IC realizes the constant over load protection (OLP). VCC over voltage protection can be applied as the primary OVP or opto-coupler broken protection. The AP3125B also has pin fault connection protection including floating and short connection. The floating pin protection includes the SENSE, FB, etc. The short pin protection includes the CTRL pin short protection. When these pins are floated or CTRL pin is shorted to ground, PWM switching will be disabled, thus protecting the power system. SENSE 4 FB 2 C Large undershoot (more than -0.3V) may damage the SENSE pin Figure 1 AP3125B Document number: DS36659 Rev. 3 - 2 8 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Operation Description (Cont.) NEW PRODUCT Brownout Protection Function To avoid potential high current stress at low line voltage, AP3125B introduces reliable brownout protection. AC line voltage information is sampled through a voltage divider net-work, adjusting the divider ratio to achieve expected brownout protection voltage. A typical 0.1nFcapacitor is strongly recommended to parallel with BNO pin to bypass any accidental spike in AC line for preventing false trigger. When the voltage across BNO pin is higher than 0.95V and V CC reaches UVLO/ON, the GATE pin will output drive signals. If the BNO voltage falls below 0.9V and lasts for 50ms, the GATE pin will turn off and the system will enter hiccup mode until the line voltage rises over its brown-in voltage again. Internal OTP Protection Function The AP3125B integrates an internal temperature sensor. It has a trigger window of +150C enter and +125C exit. The internal OTP protection mode is auto-recovery mode. Ordering Information AP3125XX XX XX - G1 Product Name Product Version* Package B : AP3125B K : SOT26 Packing RoHS/Green TR : Tape & Reel G1 : Green Diodes IC's Pb-free products with "G1" suffix in the part number, are RoHS compliant and green. Package Part Number SOT26 AP3125BKTR-G1 Marking ID Packing GLV 3000/Tape & Reel *Product Version Classification (with Different Protection Functions) Product Version Frequency VOVP OLP & SOCP BNO LOVP AP3125B 65kHz Auto-Recoverable Auto-Recoverable Auto-Recoverable Latch Marking Information (Top View) : Logo XXX: Marking ID (See Ordering Information) AP3125B Document number: DS36659 Rev. 3 - 2 9 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SOT26 0 2.820(0.111) 8 NEW PRODUCT 3.100(0.122) 0.300(0.012) 0.500(0.020) 5 4 2 3 0.300(0.012) 0.600(0.024) 1.500(0.059) 1.700(0.067) 2.650(0.104) 3.000(0.118) 6 0.200(0.008) Pin 1 Mark 1 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.150(0.006) 1.800(0.071) 2.000(0.079) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.450(0.057) MAX 1.300(0.051) AP3125B Document number: DS36659 Rev. 3 - 2 10 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B Suggested Pad Layout Package Type: SOT26 NEW PRODUCT (1) Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch) Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 AP3125B Document number: DS36659 Rev. 3 - 2 11 of 12 www.diodes.com July 2014 (c) Diodes Incorporated A Product Line of Diodes Incorporated AP3125B IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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Copyright (c) 2014, Diodes Incorporated www.diodes.com AP3125B Document number: DS36659 Rev. 3 - 2 12 of 12 www.diodes.com July 2014 (c) Diodes Incorporated Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Diodes Incorporated: AP3125BKTR-G1 AP3125B1KTR-G1