OB5682PASP

OB5682x High Precision LED Off-line LED Power Switch GENERAL DESCRIPTION FEATURES OB5682x is a primary side regulation off-line LED lighting power switch which can achieve accurate LED current. It significantly simplifies LED lighting system design by eliminating the secondary side feedback circuitry, HV startup resistor and power supply capacitor. LED current (CC control) can be adjusted by the external sense resistor connected between CS pin and ground. OB5682x offers comprehensive protection coverage with auto-recovery features including LED open circuit protection, LED short circuit protection, Cycle-by-Cycle current limiting, and thermal foldback, etc.     HV startup without power supply capacitor Low System Cost and High Efficiency Low operation current Primary-side Sensing and Regulation Without TL431 and Opto-coupler      Cycle-by-Cycle Current Limiting Built-in Leading Edge Blanking (LEB) LED Short Circuit Protection LED Open Circuit Protection Thermal foldback APPLICATIONS OB5682x is offered in SOT33-5(A)/SOP7/DIP7 package.  LED lighting TYPICAL APPLICATION VLED ~ AC NP + NS + CO OB5682x ©On-Bright Electronics HV GND OVP CS Drain Confidential -1- Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch GENERAL INFORMATION Pin Configuration The pin map is shown as below for SOT33-5(A). HV 1 GND 2 5 4 OVP Package Dissipation Rating Package RθJA (℃/W) SOT33-5(A) 145 SOP7 95 DIP7 77 CS Absolute Maximum Ratings Parameter Drain Voltage HV Voltage CS Input Voltage OVP Input Voltage Min/Max Operating Junction Temperature TJ Operating Ambient Temperature TA Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) DRAIN 3 The pin map is shown as below for SOP7. 7 HV 1 NC 2 OVP 3 6 DRAIN CS 4 5 DRAIN GND The pin map is shown as below for DIP7. 7 CS 3 6 DRAIN 4 5 DRAIN HV 1 NC 2 GND OVP Value -0.3 to BVdss -0.3 to 650V -0.3 to 8V -0.3 to 8V -40 to 150 ℃ -40 to 85 ℃ -55 to 150 ℃ 260 ℃ Note: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, 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-rated conditions for extended periods may affect device reliability. Ordering Information Part Number Description SOT33-5(A), Halogen-free in OB5682MMKP-H T&R OB5682NJP-H SOP7, Halogen-free in Tube OB5682NJPA-H SOP7, Halogen-free in T&R OB5682PJP SOP7, Halogen-free in Tube OB5682PJPA SOP7, Halogen-free in T&R OB5682PASP DIP7, Halogen-free in Tube OB5682TASP DIP7, Halogen-free in Tube Output Power Table 90~264Vac Product Input OB5682MMKP-H 6W OB5682NJP-H 9W 220Vac±20% Input 10W 12W OB5682PJP 12W 15W OB5682PASP 14W 20W OB5682TASP 16W 24W Note: Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50℃ ambient and 60℃ temperature rise. Higher output power is possible with extra added heat sink, air circulation and decrease output current to reduce thermal resistance. Marking Information OB5682x High Precision Off-line LED Switch X Package X X Package Halogen-free - X Packing Bvdss MK:SOT33-5(A) P:Halogen-free Blank:Tube Blank:600V J:SOP7 H:650V A:T&R AS:DIP7 ©On-Bright Electronics Confidential -2- Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch YWWZZZ OB5682N Ps 682YWW ZZZ s Y: Year Code WW: Week Code (01-52) ZZZ:Lot Code S: Internal Code(Optional) YWWZZZ OB5682P Ps Y: Year Code Y: Year Code WW: Week Code (01-52) WW: Week Code (01-52) ZZZ:Lot Code ZZZ:Lot Code P:Halogen-free Package P:Halogen-free Package S: Internal Code(Optional) S: Internal Code(Optional) YWWZZZ OB5682T Ps YWWZZZ OB5682P Ps Y: Year Code Y: Year Code WW: Week Code (01-52) WW: Week Code (01-52) ZZZ:Lot Code ZZZ:Lot Code P:Halogen-free Package P:Halogen-free Package s: Internal Code(Optional) s: Internal Code(Optional) TERMINAL ASSIGNMENTS for OB5682MMKP-H Pin Num 1 2 3 4 5 Pin Name HV GND OVP Drain CS I/O P P I I I Description High Voltage power supply Ground Over Voltage Protection configuration pin Drain of internal MOSFET Current sense pin TERMINAL ASSIGNMENTS for OB5682NJP-H/ PJP Pin Num 1 2 3 4 5,6 7 Pin Name HV NC OVP CS Drain GND I/O P I I I P Description High Voltage power supply No connection Over Voltage Protection configuration pin Current sense pin Drain of internal MOSFET Ground TERMINAL ASSIGNMENTS for OB5682PASP/ TASP Pin Num 1 2 3 4 5,6 7 Pin Name HV NC GND OVP Drain CS ©On-Bright Electronics I/O P P I I I Description High Voltage power supply No connection Ground Over Voltage Protection configuration pin Drain of internal MOSFET Current sense pin Confidential 3 Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch BLOCK DIAGRAM HV UVLO CC Controller OVP LDO Logic Control OVP DRAIN Gate Driver GND ©On-Bright Electronics Thermal foldback OCP Confidential -4- CS Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch ELECTRICAL CHARACTERISTICS (TA = 25℃if not otherwise noted) Symbol Parameter Test Conditions Min Typ. Max Unit Supply Voltage (VDD) Section I_static Static Current HV=45V 200 uA Current Sense Input Section TLEB Leading Edge Blanking time 0.4 us Vth_ocp Over current threshold 500 mV Toff_max Maximum off time 600 us Ton_max Maximum on time 50 us Tdem_blk Demag blanking time 2 us Rovp=10Kohm 5 us Rovp=floating 4.7 us 130 ℃ OVP Section Toff_min Minimum off time Thermal Section Tthermal Thermal regulation threshold BVdss(V) MOSFET Drain-Source Breakdown Voltage Parameter Product OB5682MMKP-H OB5682NJP-H OB5682PJP OB5682PASP OB5682TASP Min 650 650 600 600 600 Typ. ©On-Bright Electronics Confidential -5- Max Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch OPERATION DESCRIPTION OB5682x is a cost effective PWM power switch optimized for off-line LED lighting applications. Based on flyback converter topology working in DCM mode, it operates in primary side sensing and regulation, It significantly simplifies the LED lighting system design by eliminating the secondary side feedback circuitry, HV startup resistor and power supply capacitor. Proprietary built-in CC control can achieve high precision LED current meeting LED lighting application requirements. Where Vth_ocp is over current threshold, N is the ratio of transformer between primary winding and secondary winding. Adjustable CC point and Output Power In OB5682x, the CC point and maximum output power can be externally adjusted by external current sense resistor Rcs at CS pin as illustrated in Typical Application Diagram. The output power is adjusted through CC point change. The larger Rcs, the smaller CC point is, and the smaller output power becomes. Start up Control Operation switching frequency The switching frequency of OB5682x is adaptively controlled according to the load conditions and the operation modes. No external frequency setting components are required. For flyback operating in DCM, The operation frequency is given by At work state, OB5682x gets power supply directly from HV pin and regulates the supply voltage by internal startup circuits. Principle of CC Operation To support OB5682x proprietary CC control, system needs to be designed in DCM mode for flyback system (Refer to Typical Application Diagram on page1). The LED output current ILED is given by: 1 𝐼𝐿𝐸𝐷 = 2 𝐿𝑃 . 𝐹𝑆𝑊 . 𝐼𝑃𝐾 2 /𝑉𝑂 𝐹𝑆𝑊 = 8 . (1) 1 LED Short Circuit Protection OB5682x detects the states of LED. When LED string short circuit occurs, the switching frequency is reduced to the minimum switching frequency with maximum Toff time. OB5682x resumes normal operation after the fault condition is removed. PWM Off Programmable LED Open Circuit Protection / OVP The OB5682x provide programmable output over voltage protection when LED string are open. The threshold voltage of OVP is set by the minimum off time (Toff_min), when the off time of OB5682x is less then the Toff_min OB5682x stops switching and re-detect the LED string status after 150ms (typical). If the fault condition is removed, OB5682x resumes normal operation. Otherwise, the above operation is repeated. The minimum off time (Toff_min) is given by TDemag TON PWM On Figure.1 Primary voltage waveform Since Tdemag is direct proportional to the inductance, as a result, the product of Lp and Fsw is constant, thus output current will not change as primary winding inductance changes. The output LED current is 1 𝐼𝐿𝐸𝐷 = 4 𝑁 𝑉𝑡ℎ_𝑜𝑐𝑝 𝑅𝐶𝑆 ©On-Bright Electronics (4) Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB5682x. The switch current is detected by a sense resistor into the CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial power MOSFET on state so that the external RC filtering on sense input is no longer needed. (2) 𝑑𝑒𝑚𝑎𝑔 𝐿𝑝 . 𝐼𝐿𝐸𝐷 The switching frequency at maximum output power is recommended 65kHz~75kHz, and the minimum switching frequency at normal operation should not below 30kHz. Where Lp indicates the inductance of primary winding, Ipk is the peak current of primary winding. Refer to the equation 1, the change of the primary winding inductance results in the change of the constant output current. To compensate the change from variations of primary winding inductance, the switching frequency is locked by an internal loop such that the switching frequency is 𝐹𝑆𝑊 = 2𝑇 𝑉𝑂 . 𝑁 2 𝑇𝑜𝑓𝑓_𝑚𝑖𝑛 = (3) Confidential -6- 𝐿𝑃 .𝑉𝑡ℎ_𝑜𝑐𝑝 𝑁.𝑅𝐶𝑆 .𝑉𝑂𝑉𝑃 (5 ) Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch Where Vovp is threshold voltage of OVP. A resistor Rovp is connected between the OVP pin and ground. The minimum off time (Toff_min) can be adjusting the resistance of Rovp, the resistance is given by 𝑅𝑂𝑉𝑃 = 𝑇 0.05 𝑜𝑓𝑓_𝑚𝑖𝑛 Thermal foldback OB5682x provides thermal foldback function to control LED output current. The LED current will reduce with the temperature rise up. When the temperature is over 130 ℃ (typical), the output current follows the thermal foldback function scheme. When the temperature is below 130℃ (typical), the output current returns to the full level. (6) And the resistance range of Rovp should be 5K~16K for Toff_min setting. When OVP pin floating, Toff_min is set to 4.7us internally. ©On-Bright Electronics Confidential -7- Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch PACKAGE MECHANICAL DATA SOP7 Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.050 0.250 0.002 0.010 A2 1.250 1.650 0.049 0.065 b 0.310 0.510 0.012 0.020 c 0.100 0.250 0.004 0.010 D 4.700 5.150 0.185 0.203 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 (BSC) 0.050 (BSC) L 0.400 1.270 0.016 0.050 θ 0º 8º 0º 8º ©On-Bright Electronics Confidential -8- Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch SOT33-5(A) Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A - 1.30 - 0.051 A1 0.05 0.15 0.002 0.006 A2 1.05 1.15 0.041 0.045 a 0.52 0.60 0.020 0.024 b 0.58 0.66 0.023 0.026 c 0.15 0.19 0.006 0.007 D 3.80 4.00 0.150 0.157 E1 2.50 2.70 0.098 0.106 E 3.80 4.20 0.150 0.165 e 0.90(BSC) 0.035(BSC) e1 0.81(BSC) 0.032(BSC) e2 1.25(BSC) 0.049(BSC) L 0.40 0.60 0.016 0.024 θ 0º 8º 0º 8º ©On-Bright Electronics Confidential -9- Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch DIP7 Symbol A A1 A2 B B1 C D E E1 e L E2 Dimensions In Millimeters Min Max 3.710 0.381 2.921 0.350 5.334 Dimensions In Inches Min Max 4.953 0.650 0.146 0.015 0.115 0.014 0.360 10.160 7.112 8.255 0.008 0.354 0.240 0.288 1.524 (BSC) 0.200 9.000 6.096 7.320 ©On-Bright Electronics 0.195 0.026 0.06 (BSC) 2.540 (BSC) 2.921 7.620 0.210 0.014 0.400 0.280 0.325 0.1 (BSC) 3.810 10.920 Confidential - 10 - 0.115 0.300 0.150 0.430 Datasheet OB_DOC_DS_5682xA2 OB5682x High Precision LED Off-line LED Power Switch Power Switch IMPORTANT NOTICE RIGHT TO MAKE CHANGES On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. WARRANTY INFORMATION On-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. LIFE SUPPORT On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications. MILITARY On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications. ©On-Bright Electronics Confidential - 11 - Datasheet OB_DOC_DS_5682xA2