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Document overview
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Technical content
Features
Very Low Start-up Current Current Mode Control Non-audible-noise Green-mode Control Skip Mode Adjustable Internal Slope Compensation Soft Start During Startup Process Frequency Fold Back for High Average Efficiency Secondary Short Winding Protection with FOCP Soft Switching for Reducing EMI VCC Maintain Mode Latch Function for OTP/OVP Useful Pin Fault Protection: SENSE Pin Floating CTRL 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 AP3103 Pin Assignments (Top View) SOT-23-6 (K Package)
Applications
Switching AC-DC Adapter/Charger ATX/BTX Auxiliary Power Set-top Box(STB) Power Supply Open Frame Switching Power Supply 3 4 Pin 1 Mark 6GND FB CTRL GATE VCC SENSE
Document number: DS36927 Rev. 2 - 2 2 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Typical Applications Circuit ~ ~ + VCC GND GATE FB SENSECTRL AZ431 AP3105/V/L/R L2T1 R13 C7 R14 R15 R16 R17 R18 C10 R12R11 R10 C5R6 R19 R4C2 VR1 NTC R2 R3 C11 NTC R20 Pin Descriptions Pin Number Pin Name Function 1 GND Signal ground. Current return for driver and control circuits 2 FB Feedback. Directly connected to the opto-coupler
3 CTRL
Latch trigger if this pin voltage drops below a threshold or over another threshold, leave CTRL pin open if this function is not needed. Connecting a NTC thermistor to GND can achieve OTP protection
4 SENSE Current Sense
5 VCC Supply voltage of driver and control circuits
6 GATE Gate driver output
Document number: DS36927 Rev. 2 - 2 3 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Functional Block Diagram GND GATE 250ns LEB Driver 13V QD CLK RB DFF OSC with Frequency Jitter 0.85V VCC_OVP OLP VCC 32V 28V VCC_OVPOVP UVLOUVLO 15.5V 8.6V Internal Bias 0.5V Auto Recovery Protection AP3105/V/L/R 100μA Line Compensation FB R Burst PWM 1.1V Soft Start 0.5V CTRL_H 1.8V Latch-off Protection OCP OLP FOCP FOCP 2.5V 3.6V0.6V 10K CTRL_H CTRL_L CTRL_L 5 3 CTRL SENSE 32ms Delay
Document number: DS36927 Rev. 2 - 2 4 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Absolute Maximum Ratings (Note 1) Symbol Parameter Rating Unit VCC Power Supply Voltage 30 V IO Gate Output Current 350 mA VFB, VSENSE, VCTRL Input Voltage to FB, SENSE, CTRL -0.3 to 7 V θJA Thermal Resistance (Junction to Ambient) 250 ºC/W PD Power Dissipation at TA<25ºC 500 mW TJ Operating Junction Temperature -40 to +150 ºC TSTG Storage Temperature Range +150 ºC – ESD (Human Body Model) 3000 V – ESD (Machine Model) 300 V Note 1. 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 Operati ng Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability Recommended Operating Conditions Symbol Parameter Min Max Unit VCC Supply Voltage 10 25 V
Document number: DS36927 Rev. 2 - 2 5 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Electrical Characteristics (@TA=+25° C, VCC=16V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit Supply Voltage (VCC Pin) ISTARTUP Startup Current – 2 5 25 µA ICC Operating Supply Current VFB=0V, CL=1nF 0.5 0.85 1.2 mA VFB=3V, CL=0nF 0.6 1.2 2.0 – UVLO (on) – 14.5 15.5 16.5 V – VCC Maintain – 9.7 10.2 10.7 V – UVLO (off) – 7.6 8.6 9.6 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 -20oC to +125oC (Note 2) – – 5 % – Frequency Voltage Stability VCC=12V to 30V – – 3 % – Frequency Dithering – ±4 ±6 ±8 % Current Sense Section (SENSE Pin) VCS Maximum SENSE Voltage VFB=3.6V 0.800 0.850 0.900 V – FOCP Voltage – 1.65 1.8 1.95 V – LEB Time of SENSE – 150 250 350 ns – Delay to Output (Note 2) – – 100 – ns – Soft-start Time – 3 5 8 ms Feedback Input Section (FB Pin) – The Ratio of Input Voltage to Current Sense Voltage – 2.5 3 3.5 V/V – Input Impedance – 7 10 13 kΩ – Source Current VFB=0V -0.75 -0.5 -0.25 mA – Green Mode Threshold – – 2 – V – Input Voltage for Zero Duty – 1.3 1.55 1.8 V Output Section (GATE Pin) – Output Low Level IO=20mA, VCC=12V – – 1 V – Output High Level IO=20mA, VCC=12V 8 – – V – Output Clamping – 11 13 15 V – Rising Time (Note 2) CL=1nF, VCC=13V – 150 250 ns – Falling Time (Note 2) CL=1nF, VCC=13V – 50 100 ns
Document number: DS36927 Rev. 2 - 2 6 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Electrical Characteristics (Cont.) (@TA=+25° C, VCC=16V, unless otherwise specified.) Protection Section (CTRL Pin) – Source Current – 90 100 110 µA – Internal Reference Voltage – – 1.5 – V – Low Threshold Trigger for Latch – 0.47 0.5 0.53 V – High Threshold Trigger for Latch – 2.35 2.5 2.65 V – Pull-up Current (Note 3) – – – 2 mA Delay Time Section – Delay of Short Circuit Protection – 22 32 40 ms – Delay of Hiccup Protection VCC OVP – 25 – µs Notes: 2 . Guaranteed by design. 3 . The sourcing current of CTRL pin must be limited below 5mA.Otherwise it may cause permanent damage to the device.
Document number: DS36927 Rev. 2 - 2 7 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Performance Characteristics Startup Voltage vs. Ambient Temperature Shutdown Voltage vs. Ambient Temperature Startup Current vs. Ambient Temperature Operating Current vs. Ambient Temperature CTRL Utilization for Latch CTRL VCC NTC Option CTRL VCC NTC Option VCC CTRL NTC Option OVP and OTP OVP OTP -40 -20 0 20 40 60 80 100 120 140 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 Startup Voltage (V) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 120 140 7.0 7.5 8.0 8.5 9.0 9.5 10.0 Shutdown Voltage (V) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 120 140 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 Startup Current (A) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Operating Current (mA) Ambient Temperature ( o
Document number: DS36927 Rev. 2 - 2 8 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Operation Description The AP3105/V/L/ R is specifically designed for off -line AC -DC power supply used in LCD monitor, noteboo k adapter and battery charger applications. It offers a cost effective solution with a versatile protection function. Start-up Current and UVLO The start-up current of AP3105/V/L/ R is optimized to realize ultra low current (5 µA typical) so that VCC capaci tor 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 inclu ded in AP3105/V/L/ R to detect the voltage on V CC pin. It ensures that AP3105/V/L/ R can draw adequate energy from hold-up capacitor during power-on. The turn-on threshold is 15.5V and the turn-off threshold is 8.6V. Current Sense Comparator and PWM Latch The AP3105/V/L/R 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 sign al 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: SFBPK R3/)8.0V(I Moreover, FOCP with 1.8V th reshold 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 o f 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 on 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). FB SENSE GATE GND CTRL 6 AP3105 VCC Large undershoot (more than -0.3V) may damage the SENSE pin R C Necessary Figure 1 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.
Document number: DS36927 Rev. 2 - 2 9 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Operation Description (Cont.) FB Pin and Short Circuit Protection This pin is normally connected to the opto -coupler and always paralleled w ith a capacitor for loop compe nsation. When the voltage at this pin is greater than 4.2V and lasts for about 32ms, the IC will enter t he protection mode. For AP3105/V/R, 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 opto-coupler is cut off. 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 AP3105/V/L/R 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 VCC maintain function will cooperate 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 VCC is not easy to touch the shutdown threshold during the startup process and step load. This will also simplify the system design. The normal VCC voltage is suggested to be designed a little higher than V CC maintain threshold thus can achieve the best balance between the standby and step load performance. System Protection and Pin Fault Protection The AP3105/V/L/R 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 AP3105/V/L/ R also has pin fault connection protection including floating and short connection. The floating pin protection include the SENSE, FB, etc.. The short pin protec tion 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. Latch Protection Function For some applications, the system requires the latch protection function. The CTRL pin has two kinds of modes to trigger the latch protection: high latch protection is triggered, the IC will disable the output signal, and the bulk capacitor provides the energy to IC through the startup res istor to ensure the IC disable the output (latch mode). This mode will not be released until the AC input is shut off. So, the de -latch time is mainly depending on the HV startup bulk capacitor value. Therefore, if the system want s a short de -latch time, it is better for the startup resistor take power from the point before the rectifier bridge as illustrated in below figure. VCC GND FB CTRL AP3105V/L/R SENSE AC Mains (90V to 265V) CBUS GATE
Document number: DS36927 Rev. 2 - 2 10 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated
Ordering Information
TR : Tape & Reel V: AP3105V G1 : Green Product Name RoHS/GreenPackage K : SOT-23-6Blank: AP3105 L: AP3105L R: AP3105R Diodes IC‟s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green . Package Part Number Marking ID Packing Type SOT-23-6 AP3105KTR-G1 GHN Tape & Reel AP3105VKTR-G1 GHO Tape & Reel AP3105LKTR-G1 GHP Tape & Reel AP3105RKTR-G1 GHQ Tape & Reel *Product Version Classification (with Different Protection Functions) Product Version Frequency VOVP OLP&SOCP CTRL (Low) CTRL (High) AP3105 65kHz Auto-Recoverable Auto-Recoverable Latch Auto-Recoverable AP3105V 65kHz Latch Auto-Recoverable Latch Latch AP3105L 65kHz Latch Latch Latch Latch AP3105R 65kHz Auto-Recoverable Auto-Recoverable Auto-Recoverable Latch
Document number: DS36927 Rev. 2 - 2 11 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SOT-23-6 2.820(0.111) 3.100(0.122) 2.650(0.104) 3.000(0.118) 1.500(0.059) 1.700(0.067) 0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.300(0.012) 0.500(0.020) 0.700(0.028)REF 0.100(0.004) 0.200(0.008) 0.200(0.008) 0.300(0.012) 0.600(0.024) 0.000(0.000) 0.150(0.006) 0.900(0.035) 1.300(0.051) 1.450(0.057) MAX 1 2 3 456 Pin 1 Mark
Document number: DS36927 Rev. 2 - 2 12 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated Suggested Pad Layout (1) Package Type: SOT-23-6 E E G Z Y X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch)
Document number: DS36927 Rev. 2 - 2 13 of 13 www.diodes.com February 2014 © Diodes Incorporated AP3105/V/L/R A Product Line of Diodes Incorporated IMPORTANT NOTICE DIODES IN CORPORATED 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). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assu me any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license unde r its patent or trademark rights, nor the rights of others. Any Customer or user of this docum ent or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diod es Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Custome rs shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product nam es and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or support that may be provided by Diodes Incorporated . Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2012, Diodes Incorporated www.diodes.com