王军（先生） 130288273987 0755-61391231（1212） QQ1654804460 SE8510 Offline Isolated Flyback LED Controller with Primary Side Control Features Primary side regulation control, no opto-isolator required for regulation Primary side supply chip power, simplify transformer design 8VAC～265VAC wide input voltage Simple application design Accurate regulated LED current (3%) Chip enable control High line & load regulation LED short & open protection Primary side OCP, supply UVLO protection ZCD short protection CS sense resistor open protection OTP protection Enable control Cycle-by-Cycle current control and protection Patent pending sense architecture 6 pin SOT23 & 8 pin SOP package Applications AC/DC or DC/DC LED driver applications LED housekeeping power supplies Other LED constant current application Description SE8510 is an offline isolated flyback led controller with primary side control IC. Boundary mode operation provides a small magnetic solution with excellent load regulation. Using a patent pending current sensing scheme, the controller is able to deliver a well regulated current to the secondary side without using an opto-coupler. SE8510 uses a rugged high voltage junction isolated process that can withstand an input voltage surge of up to 450V. Then SE8510 can be powered directly by main line input voltage source, this simplify the design of transformer for wide output voltage. Also the total application design becomes simpler than before. SE8510 has enable control feature. Additional features include thermal shutdown, current limit, open & short LED load and VDD under-voltage lockout. Typical Application Typical SE8510 LED Driver Application Circuit Shenzhen Quanan Technology Development Co., Ltd. TEL：0755-61391212 SE8510 Pin Configuration Pin Descriptions Name SOP8 Description VIN 1 Input voltage 8V to 400V DC CS 2 Senses primary current GND 3 Device ground DRV 4 Drives the gate of the external MOSFET VDD 5 Internally regulated supply voltage ZCD 6 feedback terminal to detect zero current EN 7 Enable pin COMP 8 power compensation Order Information Type Package SE8510 SOP8 Logo SE8510 YDD Temp Tape and Reel -40℃ to 85℃ 3K SE8510, EE- Company Logo，5776 - Chip Type，Y - Year，DD - Production Code Shenzhen Quanan Technology Development Co., Ltd. - 2 - TEL：0755-61391212 SE8510 Absolute Maximum Ratings VIN to GND -0.3V to +450V CS，VID, DRV, ZCD, LD, EN, COMP to GND -0.3V to (VDD+0.3V) Junction Temperature +150°C Storage Temperature Range -65°C to +150°C Note: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but device parameter specifications may not be guaranteed. Electrical Characteristics （TA = 25°C, Vdd = 7.5V, Vin=12V unless noted otherwi se） Symbol Parameter VIN Input DC supply voltage range IIN supply current Min 1 VDD Internally regulated voltage IDD VDD current for external circuitry Typical Max Unit 8 400 V - 2 3 mA 7.0 7.5 8.0 V - - 0.5 mA Condition DC input voltage VIN= 8-400V, pin DRV open VIN = 8 - 100V UVLO VDD under voltage lockout threshold 4.5 5.0 6.5 V VIN rise ∆UVLO VDD under voltage lockout hysteresis - 1.5 - V VIN fall 225 250 275 mV VCS Current sense threshold voltage Temp=-40℃ to +85℃ VDRV(hi) DRV high output voltage VDD-0.3 - VDD V IOUT = 5mA VDRV(lo) DRV low output voltage 0 - 0.3 V IOUT = -5mA KΩ For SE8510 REN VEN Pin EN pull-down resistance EN pin voltage range 2 11.0 0 - 1 V TEMP ≤ 85°C, for SE8510 TEMP ≤ 85°C, for SE8510 VEN-th EN threshold voltage range 0.20 0.25 0.30 V TBLANK Current sense blanking interval 300 450 600 ns VCS ≥ 300mV,VLD=VDD TRISE DRV rise time - 30 50 ns CGATE = 500pF TFALL DRV fall time - 30 50 ns CGATE = 500pF VZCD ZCD feedback comparator threshold 350 mV VOVP ZCD over voltage threshold 1.2 V IOCP primary side over current threshold 4.8*IPK A TSD Thermal shutdown temperature 160 °C Thy Thermal shutdown hysteresis 70 °C IPK=primary peak current 1. Also limited by package power dissipation limit, whichever is lower. 2. Due to one internal 11K resistor If the voltage of pin EN is too large there will be a large current. Shenzhen Quanan Technology Development Co., Ltd. - 3 - TEL：0755-61391212 SE8510 SIMPLIFIED INTERNAL BLOCK DIAGRAM Detailed Description SE8510 is an offline isolated flyback LED controller with primary side control IC. It this way the design of application system becomes simpler than before. combines a high performance low voltage PWM controller chip and an input high voltage Discontinuous Conduction Mode Critical conduction mode is a variable MOSFET that can withstand an input voltage surge of up to 450V. Using a patent pending frequency switching scheme that always current sensing scheme, the controller is able returns the secondary current to zero with to deliver a well regulated current to the every cycle. The SE8510 relies on boundary secondary side without using an opto-coupler. mode or discontinuous mode to calculate the Moreover it guarantees a safe operation when critical current because the sensing scheme short circuit of LEDs occurs, or open load assumes the secondary current returns to zero circuit. with every cycle. The ZCD pin uses a patented schematic to determine the zero current point. Supply Power As shown in block diagram, chip current is Primary-Side Current Control internally generated in SE8510 without using When the voltage at CS pin exceeds a peak bulky startup resistors typically required in the current sense voltage threshold, the gate drive offline many signal terminates, and the power MOSFET applications the SE8510 can be continuously turns off. The threshold is internally set to powered using its internal linear regulator that 250mV. The primary peak current can be provides a regulated voltage of 7.5V for all calculated as: applications. Moreover, in internal circuits. Its supply is from the main line source. By Shenzhen Quanan Technology Development Co., Ltd. - 4 - I୮୩ଵ = ଶହ୫ ୖౙ౩ ............................(1) TEL：0755-61391212 SE8510 Enable Features (pin EN) Pin EN can be used to control chip. One 11K resistor is placed inside the SE8510. To enable chip this pin should be set to a level larger than 300mV. Output Over Voltage & Open Load Protection (OVP) ZCD 6 1.20V R1 AUX Figure 1. Discontinuous Conduction Mode R2 Secondary-Side(load) Control Current Figure 2. Over Voltage Protection SE8510 controls the secondary side LED After the MOSFET turns off, the ZCD current from the primary side information. The comparator detects the level of pin ZCD. Once output LED mean current can be calculated its level is larger than 1.2v the gate driver will approximately as: be turned off. To avoid mis-trigger OVP the I୭୳୲ = ଶ.ହ୫× ୖౙ౩ ............................(2) or, ZCD OVP function does not work until the blank time Tzcd (fig.1), the typical interval is 1us. I୭୳୲ = ୍౦ౡభ × ସ The OVP threshold is: V୭୴୮ = 1.2 × ቀ1 + ............................(3) N — Turn ratio of primary side to secondary ୖభ ቁ ౩ౙ ୖమ ౫౮ .....................(6) side NSEC—The secondary winding turns RCS — primary side current sense resistor NAUX—The auxiliary winding turns IPK1 — primary side peak current The below wave records four OVP events. Switching Frequency The Switching Frequency of SE8510 can be calculate as: F୭ୱୡ = ౫౪ ଶ౩ౙ ୍౦ౡభ ............................(4) or, F୭ୱୡ = ౫౪ ଼౩ౙ ୍౫౪ ............................(5) Primary-Side Current Limit VOUT — output load voltage When the primary current exceeds a limit, N — Turn ratio of primary side to secondary the chip will shut down, and then wait for a side moment to restart. The limit is 4.8*IPK. LSEC — secondary side inductance IPK1 — primary side peak current It is better to set the frequency lower than Output short (OSCP) Circuit Protection Chip can control the output current, but 70KHz. The recommend value is 45KHz. when OSCP the better way is to disable PWM Shenzhen Quanan Technology Development Co., Ltd. - 5 - TEL：0755-61391212 SE8510 signal. SE8510 will trigger OSCP after short Hysteretic Thermal Shutdown LED series. After a fixed time the chip will The thermal shutdown circuitry senses the restart to try whether the OSCP is still here. If controller die temperature. The threshold is set so, the chip will re-disable PWM signal. at 160 °C typical with a 70 °C hysteresis. The below wave records two output short events. Application Example Please refer to document AN26 which has one detailed design example, or contact someone of the company. The final application is shown in figure 3. Package Information SOP8 0.189-0.197 4.801-5.004 0.150-0.157 3.810-3.988 8 7 6 5 0.228-0.244 5.791-6.197 1 0.004-0.010 0.101-0.254 2 3 4 0.053-0.069 1.346-1.752 0.016-0.050 0.406-1.270 X45° 0.008-0.010 0.203-0.254 0°-8°TYP 0.014-0.019 0.355-0.483 0.050 TYP 1.270 0.016-0.050 0.406-1.270 Version Version Date Note V1.0 2013.05.23 the first version Shenzhen Quanan Technology Development Co., Ltd. - 6 - TEL：0755-61391212 SE8510 IMPORTANT NOTICE “Preliminary” product information describes products that are in production, but for which full characterization data is not yet available. SMET Ltd. believes that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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Shenzhen Quanan Technology Develoment Co., Ltd. - 7 - TEL：0755-61391212 SE8510 Application Schematic 56K//56K//56K 1W C4 4*1N4007 0.1uF/400V D1 D2 L N Pico Fuse + T125mA 250V C1 0.1uF/250VAC R7 C3 2.7uF/400V R6 130KΩ C2 47nF/250VAC C1,C2-Xcapacitor NC D3 D4 + C5 8 COMP 7 EN 6 5 1 CS 2 ZCD GND 3 VDD DRV 4 2uF/16V R3,4,5 3//3//3Ω 1/4W 1% D5 MBR3100(ES3D) C7 UF4007 (BYV26C) Q1 1N60 200uF/25V R1 66K R2 9K Figure 3. Application Schematic 9.6V/500mA LED drive Shenzhen Quanan Technology Development Co., Ltd. - 8 - D6 C6 VIN SE8510 T1 + 2.2nF/400V LF1 80mH, line filter R8,9,10 TEL：0755-61391212 EE16 N1:N2:N3=128:16:8