SDC3106

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Document overview

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Technical content

Features

 Primary si de control without o pto-coupler and TL431  30mW standby power, meeting six-star standard  Built -in output ca bl e vol ta ge drop compensat ion  Built -i n AC compensat ion  CV /CC regulation ± 5%  Flyback topology in DCM operation  Pulse frequency modulation mode  Enhanced audio nois e suppression  Built -in lea di ng edge blanking  Over vo l ta ge protection  Short circui t protection  Package: DIP-8/SOP-8  Output power range [note1]: SDC3106(SOP -8) ≤ 6W SDC3106(DIP -8) ≤ 7.5W

Applications

 Adapters/Chargers for c ell /cordl ess phones, PDAs, MP3 and o ther portabl e dev i c es  LED driver  Standby and a uxiliary power supplies Fi gure 1. Pack age Type Not e1：Typical cont inuous power in a non-ventilated enclosed adapter m easured at +45°C ambient. DIP-8 SOP-8 SDC CONFIDENTIAL DOCUMENT

1 VCC Power supply pin

2 CPC This pin connects a capa citor for output cable voltage drop compensation

3 FB The voltage feedback from the auxiliary w inding

4 CS The primary current sense pin, this pin connects a current sense resist or

Table 1. Pin De scr iption

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 3/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 Block Diagram FB COMP EA CV Controller CS CPC Controller CPC Driver UVLO Regulator C GND VCC PFM Logic CV Reference CC Controller Protect CS Reference Pro Vpk PFM Vea Fi gure 3. Functional Blo ck Diagram SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 4/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106

Ordering Information

A:6% B:3% C:0% E1: Pb-free G1: Halogen-free TR: Tape Reel Blank: Tube X X - X Package DIP-8: Z SOP-8: U X Package Temperature Ran ge Part Number Marking ID Packing Type Pb-free Halogen-free Pb-free Halogen-free DIP-8 -40~85℃ SDC3106AZ-E1 SDC3106AZ-G1 3106A 3106AG Tube SDC3106BZ -E1 SDC3106BZ -G1 3106B 3106BG Tube SDC3106CZ -E1 SDC3106CZ -G1 3106C 3106CG Tube SOP-8 SDC3106AUTR-E1 SDC3106AUTR -G1 3106A 3106AG Tape Reel SDC3106BUTR-E1 SDC3106BUTR-G1 3106B 3106BG Tape Reel SDC3106CUTR-E1 SDC3106CUTR-G1 3106C 3106CG Tape Reel SDC CONFIDENTIAL DOCUMENT

Table 2. Absolute Maximum Ratings Table 3. Recommended Operating Conditions

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 6/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 Electrical Characteristics ( Ta =2 5°C,Vc c =1 5 V, unl ess otherwi se speci fi ed） Par am eter Symbol Condition Min Typ Max Unit Power Current Section Start-up threshold VTH - 13 15.5 18 V Minim al ope r ating voltage VOFF - 5.4 6.0 6.6 V Start-up current IST VCC=VTH-1, before start-up 0 0.2 0.6 uA Operat ing current ICC - - 500 - uA Current Sense Section Current sense threshold vol tage in CC mode VCS - 475 500 525 mV Leadi ng edge blanking tLEB - - 500 - ns Feedback Input Section FB leakage current IFB VFB=4V 1.6 2.2 3.0 uA Feedback threshold VFB Full Load 3.98 4.04 4.10 V AC Compensation Section Built -in line compensat ion current ILINE VFB= -10V - 10 - uA Built -in line compensat ion resistor RLINE - - 3.3 - kΩ Cable Compensation Section Cable compensat ion voltage - SDC3106A - 6 - % - SDC3106B - 3 - % - SDC3106C - 0 - % BJT Section Collector -base Vol tage VCBO IC=0.1mA 700 - - V Collector -base cutoff current IC BO VCB=700V,IE=0mA - 0.1 mA DC current gain hFE VCE=5V，IC=0.5A 15 - 50 - Protection Section FB over vol tage protecti on VFB_OVP - 7.0 8.0 9.0 V Maxi mum off ti me of pri mary side tOFF_MAX - - 16 - ms Maxi mum on ti me of pri mary side t ONP_MAX - - 18 - us Tabl e 4. El ectrical Characteristics SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 7/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 Operation Description Start-up The start-up current of SDC 3106 is desi gned to be very low (typ. 0.2uA), so that VCC could be charged up above UVLO threshold level and device starts up quickly. A large val ue s ta r t-up re sistor can therefore be used to minimize the power loss in applicat ion. Operating Current The operating current of SDC3106 is as low as 500uA, so that good efficiency and very low st andby po wer(l ess than 30mW) is achi eved. CC/CV Operation SDC3106 is designed to produce CC/CV control characteristic as shown in the figure 4 . IO ±5% ±5% V-I VO Fi gure 4. Typical CC/CV Curve In charger applicat ions, a discharged battery charging starts in the CC portion of the curve until it is nearly full charged and smoothly sw itches to operat e in CV portion of the curve. The CC portion provide s output current limit ing. In CV operation, the output voltage is regulated through the primary side control. In CC operation mode, SDC3106 will regulate the output current constant regardl ess of the output voltage drop. Principle of Operation T o support SDC3106 proprietary CC/CV control, system needs to be designed in DCM mode for flyback system. In the DCM flyback converter, the output voltage can be sensed via the auxiliary winding. During BJT turn- on ti me, the load current is supplied f rom the outpu t filter cap acitor, and t he current in the primary w inding ramps up. When BJT turns off, the energy stored in the primary winding is transferred to the secondary side such that the output current is : ONS P O PK SW S T NII TN= × ×× IO -- The average current of secondary si de TONS -- The conduction time when secondary side diode is“ON” TSW -- The period of switching frequency NP -- The primary side winding NS -- The secondary side winding IPK -- Peak val ue of pri mary side current FB VN Tonp Tons Tsw Toffs t Fi gure 5. Auxiliary Vo ltage Waveform In CC operat ion mode, SDC3106 calculates the output current through the peak value of primary side current and the ratio of the secondary side diode conduction ti me and the switching period. In CC mode of SDC3106, the ratio of T ONS and TSW is 0.5, and the VCS is about 0.5V. So the output current can be approximated as: CS P O S NI RN= ×× The auxi liary vol tage refl ects the output vol tage as shown in Figure 5 and it is given by ( )= AUX AUX O D S NV VV N ×+ VAUX -- The transient volt age at auxiliary winding NAUX -- The auxiliary w inding NS -- The secondary side winding VO -- The average vol tage of secondary si de VD -- The drop voltage of the output diode SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 8/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 In CV mode, th e output voltage is stabilized through the sampl ed FB vol tage being regul ated to a const ant value of 4.04 V (typ .). Th e rel ati onshi p between VAUX and VFB is given by =1 FB AUX FB FB RVV R + Where V FB is the volt age of FB pin, R FB1 is the upper resistor of FB, and RFB2 is the l ower resistor of FB. Thus, the full load output voltage V o can be expre ssed as: FB FB S FB OD AUX RVN RVV N VD RFB2 RFB1 FB VFB NP NS NA Fi gure 6. FB Feedback Scheme Operation Switching Frequency and Audio Noise Suppression The sw itching frequency of SDC3106 is adapt ively controlled according to the load condit ions and the operation modes. Considering power BJT is integrated, the operation switching frequency is recommended below 100 kHz. Since the system working in DCM mode, the maxi mum output power is given by P 1= 2 PKO SWP LF I×× × Where LP is transformer primary induct ance, I PK is primary peak current in a sw itching cycle, F SW is switching frequency. Via a resistor divider connected between the auxiliary winding and FB, the output voltage is sam p le d ind ire ct ly . Then, SDC3106 regulate s the switching frequency by contro lling the switch ing off tim e according to th e voltage on FB pin, thus constant voltage (CV) output can be achi eved. The switching frequency decreases along wi th the load condit ions, so it will drop into audio frequency range (20Hz~20kHz) ine vitably, which causes audio noise. SDC3106 uses two -stage peak current controlling technology, whose peak current switches to a s mall er value under light load condit ion. Thu s, the switching frequency is increased, and audio noise is suppre ssed. To ensure that the audio noise suppression function is effective, the maximum switching frequency of the system i s recommended above 55 kHz. Protection Functions Good power supply syst e m re liab ility is ach ie ve d with SDC3106 rich protection features including short/open circui t protecti on of current sense resi st or a nd FB upper/l ower resistors, FB over vol tage protecti on (OVP), VCC under voltage lockout (UVLO) protection, and maxi mum on-ti me protec ti on. SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 9/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 Typical Application CS CPC GND VCC C FB SDC3106 R10 C7 R11 R3 C4 C3 D3 1% R8 C2C1 AC 85V~265V D4-D7 GND C Fi gure 7. Typical A pp licat ion SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 10/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106

Package Information

Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 3.710 4.310 0.146 0.170 A1 0.510 0.020 A2 3.200 3.600 0.126 0.142 B 0.380 0.570 0.015 0.022 B1 1.524(BSC) 0.060(BSC) C 0.204 0.360 0.008 0.014 D 9.000 9.400 0.354 0.370 E 6.200 6.600 0.244 0.260 E1 7.320 7.920 0.288 0.312 e 2.540(BSC) 0.100(BSC) L 3.000 3.600 0.118 0.142 E2 8.400 9.000 0.331 0.354 SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 11/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 SOP-8 Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.007 0.010 D 4.700 5.100 0.185 0.201 e 1.270(BSC) 0.050(BSC) E 5.800 6.200 0.228 0.244 E1 3.800 4.000 0.150 0.157 L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° SDC CONFIDENTIAL DOCUMENT

ADV ANCE DAT ASHEET Datasheet =tt December, 2013 Rev. 1.4 12/12 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. w ww.sdc-semi.com Low-Power Primary Side Regulation Power Switch SDC 3106 Shaoxing Devechip Microelectronics Co., Ltd. U http://www .sdc-semi.com/U IMPORTANT NOTICE Information in this document is pr ovided solely in c onnection with Shaox ing Dev ec hip M icroelectr onic s Co., Ltd. ( abbr . SDC) pr oduct s. SDC rese rves the right to make changes, corre cti ons , modifi cati ons or improve ments, to this docume nt, and the products and servi ce s descr ibed her ein at anyt ime, wit hout not ic e. SDC does not assume any responsibility f or use of any its products for any particular purpose , nor does SDC assume any liability ar ising out of the applic ation or use of any its pr oducts or c irc uits. SDC does not c onv ey any li cense unde r i ts pa tent rights or othe r rights nor the rights of othe rs. © 2013 Dev echip Mi croelectroni cs - Al l ri gh ts res e rved Contac t us: Headquarters of Shaoxing Address: T ian Mu Road, No13, Shaoxing city, Zhejiang province, C hina Zip code: 312000 Tel: (86) 0575-8861 6750 Fax: (86) 0575-8862 2882 Shenzhen Branch Address: 22A, Shangbu building, Nan Yua n Road, No.68, Futian Dis trict, She nzhen city, Gua ngdong province, China Zip code: 518031 Tel: (86) 0755-8366 1155 Fax: (86) 0755-8301 8528 SDC CONFIDENTIAL DOCUMENT