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Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 16
Technical content
Features
Primary Side Control for Eliminating Opto-Coupler Built-In 650V Power MOSFET 75mW No-Load Input Power Flyback Topology in DCM Operation External Adjustable Line Compensation for CC Fixed Internal Cable Compensation Multiple Segment AM/PFM Control Mode to Improve Audio Noise and Efficiency Frequency Jitter to Improve System EMI Capacitive Load Start-Up Capability Valley-On for the Higher Efficiency and Better EMI Behavior Multiple Protections: Secondary-Side Over Voltage Protection (SOVP) Secondary-Side Under Voltage Protection (SUVP) Output Short Circuit Protection (SCP) Transformer Saturation Protection (TSP) via Primary Peak Current Limitation Internal Over Temperature Protection (OTP) SO-8 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Pin Assignments (Top View) SO-8
Applications
Routers Set-Top Box (STB) Power Supply Network Adaptors Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ 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. 7FB VCC SOURCE GND Drain Drain Drain Drain
Document number: DS41619 Rev. 2 - 2 2 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Typical Applications Circuit AC C13 R17 C12 CY1 GND DRAIN SOURCE VCC AP3981C FB VOUT GND 5,6,7,8 R18 R2D1 DB1 R13R16R15 C10 R7 R9 C14 Pin Descriptions Pin Number Pin Name Function
1 GND The ground of the IC
Connect to the auxiliary winding through a divider network, used as a multi -function pin to realize output voltage sample for CV control, t ONS detection for CC control, line voltage sense for line compensation, and FB-negative-protection detection as well.
3 VCC The power supply of the IC
4 SOURCE SOURCE terminal of the integrated MOSFET
5, 6, 7, 8 DRAIN DRAIN terminal of the integrated MOSFET
Document number: DS41619 Rev. 2 - 2 3 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Functional Block Diagram Regulator Bias PFM tONS UVLO CV_CTRL PFM Valley ON R Q S R Q S FB VCC GND Constant Voltage Control Constant Current Control tONS Detector 0.1V VCS_REF COMP EA Peak Current Control & LEB tONS Pro CC_CTRL ShutdownLine Compensation DRAIN 5, 6, 7, 8 Low Pass VCPC VREF Driver VLINE VCC OVP FB OVP/SUVP/SCP RFB Short/Open Protection RCS Short/Open Protection Transformer Saturation Protection VCC VCS Square Root Function Cable Compenstaion VCPC VCPC V
4 SOURCE
CS_REF
Document number: DS41619 Rev. 2 - 2 4 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Absolute Maximum Ratings (Note 4) Symbol Parameter Rating Unit VCC Supply Voltage -0.3 to 35 V VSOURCE SOURCE Input Voltage -0.3 to 8 V VFB FB Input Voltage -0.3 to 8 V VDS Drain-Source Voltage (TJ=+25°C) 650 V TJ Operating Junction Temperature -40 to +150 °C TSTG Storage Temperature -65 to +150 °C TLEAD Lead Temperature (Soldering, 10s) +300 °C θJC Thermal Resistance (Junction to Case) (Note 5) 3 ° C/W θJA Thermal Resistance (Junction to Ambient) (Note 5) 65 ° C/W — ESD (Human Body Model) 2000 V — ESD (Charged Device Model) 1000 V Notes: 4. Stresses greater than those listed under “ Absolute Maximum Ratings ” can 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 can affect device reliability. 5. Test condition: Device mounted on FR-4 substrate PC board, 2oz copper, with 1inch2 cooling area. Recommended Operating Conditions Symbol Parameter Min Max Unit VCC Supply Voltage 10 28 V TA Ambient Temperature -40 +85 °C
Document number: DS41619 Rev. 2 - 2 5 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Electrical Characteristics (@TA =+25° C, VCC = 15V, unless otherwise specified.) Symbol Parameter Condition Min Typ Max Unit STARTUP AND UVLO SECTION VTH_ST Startup Threshold — 14.5 16 17.5 V VOPR(MIN) Minimum Operating Voltage — 6.1 6.8 7.5 V STANDBY CURRENT SECTION IST Startup Current VCC=VTH_ST-1V before Startup — 1 3 A ICC_OPR Minimum Operating Current Static Current 450 550 650 A CURRENT SENSE SECTION VCS_H Peak Current Sense Threshold Voltage 40% to 100% CC Load 560 630 700 mV VCS_L No Load to 2% CC Load 160 180 200 mV RLINE Built-In Line Compensation Resistance — 45 55 65 tLEB Leading Edge Blanking — 370 470 570 ns CONSTANT VOLTAGE SECTION VFB Feedback Threshold Voltage Closed Loop Test of VOUT 2.35 2.4 2.45 V RatioSAMPLE_L Sample Ratio No Load to 2% CC Load 45 50 55 % RatioSAMPLE_H Sample Ratio 40% to 100% CC Load 75 80 85 % CONSTANT CURRENT SECTION tONS/tSW Below SUVP Tested @ VFB=1V — 0.75 — — Above SUVP Tested @ VFB=2V — 0.5 — — FREQUENCY JITTER ΔVCS/VCS VCS Modulation 10% Load to Full Load 1.5 2 2.5 % Cable Compensation VCABLE/VOUT Fixed Cable Compensation Ratio — — 4 — % VALLEY-ON SECTION tVAL-ON Valid Off Time of Valley-On From the End of tONS 26 32 38 s DYNAMIC SECTION tOFF(MAX) Maximum Off Time — 1.8 2 2.2 ms PROTECTION FUNCTION SECTION VFB(SOVP) Over Voltage Protection at FB Pin — 3.3 3.6 3.9 V VFB(SUVP) Under Voltage Protection at FB Pin — 1.22 1.35 1.48 V tDELAY(SUVP) Delay Time of SUVP — 116 128 140 ms VFB(SCP) Output Short Protection at FB Pin — 680 750 820 mV tDELAY(SCP) Delay Time of SCP — 58 64 70 ms VCC(OVP) Over Voltage Protection at VCC Pin — 29.5 32 34.5 V tONP(MAX) Maximum Turn-ON Time — 12 16 20 s VCS(MIN) Minimum Peak Current Sense Voltage at tONP=4s — 120 150 180 mV VCS(MAX) Maximum CS Voltage — 720 800 880 mV
Document number: DS41619 Rev. 2 - 2 6 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Electrical Characteristics (@TA =+25° C, VCC = 15V, unless otherwise specified.) (continued) Symbol Parameter Condition Min Typ Max Unit PROTECTION FUNCTION SECTION VFB_NEG_L Low Threshold for FB Negative Voltage Protection — 11 14 17 mV VFB_NEG_H High Threshold for FB Negative Voltage Protection — 27 36 45 mV TOTP Shutdown Temperature — +130 +145 +160 °C THYS Temperature Hysteresis — +27 +30 +33 °C POWER MOSFET SECTION BVDSS Integrated MOSFET Drain-Source Break-Down Voltage (Note 6) — 650 — — V RDS(ON) Static Drain-Source On-Resistance — — 2.8 3.5 ID Continuous Drain Current — — — 3 A Note： 6. The aging condition of drain-source voltage is 80% of BVDSS.
Document number: DS41619 Rev. 2 - 2 7 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Performance Characteristics Start-Up Voltage vs. Ambient Temperature Start-Up Current vs. Ambient Temperature Minimal Operating Voltage vs. Ambient Temperature Operating Current vs. Ambient Temperature VCS_H vs. Ambient Temperature tONS/tSW Above SUVP vs. Ambient Temperature -40 -20 0 20 40 60 80 100 120 140 15.0 15.5 16.0 16.5 17.0 17.5 18.0 Ambient Temperature ( o Start-Up Voltage (V) -40 -20 0 20 40 60 80 100 120 140 Start-Up Current (A) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 120 140 Ambient Temperature ( o Minimun Operating Voltage (V) -40 -20 0 20 40 60 80 100 120 140 300 350 400 450 500 550 600 650 700 Ambient Temperature ( o Operating Current (A) -40 -20 0 20 40 60 80 100 120 140 600 620 640 660 680 700 Ambient Temperature ( o VCS_H (mV) -40 -20 0 20 40 60 80 100 120 140 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Ambient Temperature ( o tONS/tSW
Document number: DS41619 Rev. 2 - 2 8 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Performance Characteristics (continued) Feedback Voltage vs. Ambient Temperature VCC OVP Voltage vs. Ambient Temperature Line Compensation Resistance Maximum Off Time vs. Ambient Temperature vs. Ambient Temperature Low Threshold Voltage for FB_Negative Protection Feedback Voltage of SUVP vs. Ambient Temperature vs. Ambient Temperature -40 -20 0 20 40 60 80 100 120 140 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Ambient Temperature ( o VFB of SUVP (V) -40 -20 0 20 40 60 80 100 120 140 Ambient Temperature ( o Low Threshold Voltage for FB_Negative Protection (mV) -40 -20 0 20 40 60 80 100 120 140 1.0 1.5 2.0 2.5 3.0 Ambient Temperature ( o Maximum Off Time (ms) -40 -20 0 20 40 60 80 100 120 140 100 Ambient Temperature ( o Line Compensation Resistance () -40 -20 0 20 40 60 80 100 120 140 Ambient Temperature ( o VCC OVP Voltage (V) -40 -20 0 20 40 60 80 100 120 140 2.20 2.25 2.30 2.35 2.40 2.45 2.50 Ambient Temperature ( o Feedback Voltage (V)
Where, the fSW is the switching frequency. When the peak current IPK is constant, the output power would depend on the switching frequency fSW.
- Constant Voltage Operation
constant voltage control block in the AP3981C. For system design, adjusting the ratio of RFB1 and RFB2 can get the target output voltage value. Figure 2. Auxiliary Voltage Waveform smoothly between CC mode and CV mode.
- Multiple Segment Peak Current
when switching frequency decreases below 20kHz. above 20kHz at a varying slope. Figure 3. Segment Peak Current and Operating Frequency at CV Mode ratio rises linearly from 50% to 80%.
- Capacitive Load Start-Up Capability
In order to achieve fast start -up for capacitive load startup applications, the AP3981C induces a two level CC point design during start up time. MOSFET cannot be turned off. achieve the better radiative EMI performance.
Document number: DS41619 Rev. 2 - 2 13 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Operation Description (continued) The final compensated VCS is: (8) In the above formulas, V PP is 1.8V at CC mode, RLC is 55, R2 is 60k, R1 is two times of R2, VAUX is the auxiliary winding voltage during primary-on period, which is proportional to bus voltage. Based on the formula, we can make a conclusion that a smaller RFB1 results in deeper line compensation. If we know the delay time tDELAY, typically 150ns in AP3981C, we can calculate the RFB1 as a reference for the system design. 11. Protection The AP3981C provides versatile protections to prevent the system from damage under various fault conditions. Most protections will trigge r auto- recovery mode in which the system will restart as soon as the V CC drops to VOPR(MIN), when the fault conditions are removed, the system will recover to normal operation automatically. VCC OVP A VCC OVP threshold is set to protect the IC from damage. When the V CC OVP protection is triggered, the IC will stop output ting drive signal immediately and the system will enter auto-recovery mode. Output Over Voltage Protection (SOVP) As it is described above that the FB pin voltage during tONS reflects the output voltage proportionally, this voltage can be used to realize SOVP. The AP3981C set a higher threshold, VFB(OVP), to shut down the system if the sampled voltage reached the threshold continuously for 3 switching cycles, the SOVP will be triggered and the system will enter auto-recovery mode. Output Under Voltage Protection (SUVP) Like SOVP, the AP3981C also integrates the SUVP protection. If the detected voltage on FB pin is lower than VFB(SUVP) for 128ms, the SOVP will be triggered and the system will enter auto-recovery mode. Output Short Protection (SCP) A much lower threshold is set on FB pin to protect the system when output short condition occurs . If the detected FB voltage is lower than 0.78V for 64ms, the SCP will be triggered and the system will enter auto-recovery mode. Transformer Anti-Saturation Protection Under some fault condition s or bad system design, the transformer may approach saturation and the current increases dramatically. To avoid power device damage since of transformer saturation, the AP3981C integrates a maximum VCS threshold VCS(MAX) to protect the system. If there are 3 consecutive pulses where VCS exceeds the threshold, the controller will shut down and enter auto-recovery mode. Over Temperature Protection (OTP) If the IC junction temperature exceeds the threshold of TOTP, AP3981C will shut down immediately and enter auto-recovery mode. Note that even when the VCC reaches VTH_ST, the IC will not output any drive pulse until the junction temperature falls of a hysteresis temperature of +30°C. Brown In/ Brown Out Protection The AP3981C detects the bus voltage at each switching cycle through FB pin during tONP period. When the VCC reaches VTH_ST after power on, the AP3981C will output one switching pulse to check if the detected bus voltage on FB pin is higher than VFB_NEG_H. If so, the system will start up normally, otherwise the AP3981C will stop outputting following pulses, then the VCC will drop below VOPR(MIN) and the system will repeat the process described above until the detected FB voltage is higher than VFB_NEG_H. When the power is off or there is a ditch in bus voltage, if the detected voltage is lower than VFB_NEG_L for 3 consecutive switching cycles, the IC will shut down and enter auto -recovery mode. This function is very useful when the bulk capacitor is open, or when the heavy load suddenly released after power off. LCPPREF_CS V*3 2V*3 1V
Document number: DS41619 Rev. 2 - 2 14 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT
Ordering Information
13 : 13" Tape & ReelS: SO-8 Product Name Package Part Number Marking ID Packing SO-8 AP3981CS-13 3981C 4000/Tape & Reel Marking Information SO-8 3981C (Top View) YY WW X X Logo 8 7 6 5 1 2 3 4 Marking ID WW : Week : 01~52; 52 YY : Year : 18, 19, 20~ X X : Internal Code represents 52 and 53 week
Document number: DS41619 Rev. 2 - 2 15 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SO-8 SO-8 Dim Min Max Typ A 1.40 1.50 1.45 A1 0.10 0.20 0.15 b 0.30 0.50 0.40 c 0.15 0.25 0.20 D 4.85 4.95 4.90 E 5.90 6.10 6.00 E1 3.80 3.90 3.85 E0 3.85 3.95 3.90 e -- -- 1.27 h -- -- 0.35 L 0.62 0.82 0.72 Q 0.60 0.70 0.65 All Dimensions in mm Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SO-8 Dimensions Value (in mm) C 1.27 X 0.802 X1 4.612 Y 1.505 Y1 6.50 Note: The suggested land pattern dimensions have been provided for reference only, as actual pad layouts may vary depending on appl ication. These dimensions may be modified based on user equipment capability or fabrication criteria. A more robust pattern may be desired for wave soldering and is calculated by adding 0.2 mm to the ‘Z’ dimension. For further information, please reference document IPC -7351A, Naming Convention for Standard SMT Land Patterns, and for International grid details, please see document IEC, Publication 97. Note: For high voltage applications, the appropriate industry sector guidelines should be considered with regards to creepage and c learance distances between device Terminals and PCB tracking. b e E A 9° (All sides) 4°± 3° c Q h 45° R 0.1 D L Seating Plane Gauge Plane C X Y
Document number: DS41619 Rev. 2 - 2 16 of 16 www.diodes.com June 2019 © Diodes Incorporated AP3981C NEW PRODUCT 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). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document an d any product described herein. Diodes Incorporated does not assume 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 th is document 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, Customers 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, internation al or foreign patents pending. Product names 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 mul tiple 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 ex press 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 pr ovided by Diodes Incor porated. 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 © 2019, Diodes Incorporated www.diodes.com