OB3652NCPA

OB3652N High Precision Offline LED Power Switch FEATURES OB3652N is a primary side control offline LED lighting controller with very low operation current which can achieve accurate LED current for an isolated lighting application in a single stage converter. It significantly simplifies the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler, and also the auxiliary winding inductance. A HV 600V power switch is also integrated into the device. The LED current can be adjusted externally by the sense resistor Rs at CS pin and high precision constant current regulation is realized. OB3652N offers comprehensive protection coverage with auto-recovery features including open loop protection, short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), latched over temperature protection (OTP), etc.  High precision Constant Current Regulation at Universal AC input  Primary-side Sensing and Regulation Without TL431 and Opto-coupler  Sense and supply without auxiliary winding inductance  Low System Cost and High Efficiency  Low operation current  Programmable CC Regulation  Built-in Primary winding inductance compensation  Built-in line compensation  Short Circuit Protection  Open Loop Protection  Cycle-by-Cycle Current Limiting  Built-in Leading Edge Blanking (LEB)  VDD Under Voltage Lockout with Hysteresis  Latched over temperature protection (OTP) OB3652N is offered in SOP-8 package. APPLICATIONS to GENERAL DESCRIPTION  LED lighting TYPICAL APPLICATION VLED NP ~ AC NS + CO + CS GND NC GND VDD Drain SW Drain OB3652N OUTPUT POWER TABLE 230VAC±15% 90-264VAC Open Frame Open Frame OB3652NCP 7.3W 6.7W Notes: 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 or air circulation to reduce thermal resistance. Product ©On-Bright Electronics Confidential -1- Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED Power Switch GENERAL INFORMATION Package Dissipation Rating Package RθJA (℃/W) SOP-8 90 . Absolute Maximum Ratings Parameter Value VDD Voltage -0.3 to 20V DRAIN Voltage -0.3 to 600V CS Input Voltage -0.3 to 7V SW Input Voltage -0.3 to 20V Min/Max Operating -40 to 150 ℃ Junction Temperature TJ Min/Max Storage -55 to 150 ℃ Temperature Tstg Lead Temperature 260 ℃ (Soldering, 10secs) Note: Stresses beyond those listed under “absolute maximum Pin Configuration The pin map is shown as below for SOP-8. CS 1 8 GND NC 2 7 GND VDD 3 6 Drain SW 4 5 Drain Ordering Information Part Number Description OB3652NCP 8 Pin SOP, Pb free in Tube OB3652NCPA 8 Pin SOP, Pb free in T&R Note: All Devices are offered in Pb-free Package if not 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. otherwise noted. OB3652N High Precision Offline LED Power Switch X Package C:SOP8 ©On-Bright Electronics Confidential -2- X X Package Pb free P:Pb-free Packing Blank:Tube A: Tape/Reel Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED Power Switch Marking Information TERMINAL ASSIGNMENTS Pin Num Pin Name I/O 1 CS I 2 NC 3 VDD P Power supply Input 4 SW I MOSFET Source Terminal 5,6 DRAIN I MOSFET Drain Terminal 7 GND P Power Ground, suggest to be left floating with no pad in PCB layout. 8 GND P Power Ground ©On-Bright Electronics Description Current sensing terminal No Connection Confidential -3- Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED Power Switch ELECTRICAL CHARACTERISTICS (TA = 25℃, VDD=7.5V, if not otherwise noted) Symbol Parameter Test Conditions Min Typ Max Unit Supply Voltage (VDD) Section I start-up Start up current VDD=UVLO(OFF)-1V 120 150 uA I op operation current VDD=7.5V, no loading 250 300 uA UVLO(OFF) VDD under voltage lockout exit 9 V UVLO(ON) VDD under voltage lockout enter 6.5 V VDD_CLAMP VDD CLAMP 10.5 V 0.3 us VDD current 1mA Current Sense Input Section TLEB LEB time Vth_ocp Over current threshold Td_oc OCP propagation delay Toff_max 485 500 From OCP comparator to gate drive 515 mV 100 ns Maximum off time 600 us Toff_min Minimum off time 5.5 us Ton_max Maximum on time 75 us Source drive low side on resistor 1.3 ohm Over temperature protection 150 ℃ Source Drive Section Rdson_l OTP Section OTP Power MOSFET Section BVdss MOSFET Drain-Source Breakdown Voltage Rds,on On resistance ©On-Bright Electronics 600 Static, Id=1A Confidential -4- V 9 ohm Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED Power Switch CHARACTERIZATION PLOTS UVLO(OFF) vs Temperature UVLO(ON) vs Temperature 10.0 UVLO(OFF) (V) UVLO(ON)(V) 7.5 7.1 6.7 6.3 5.9 9.6 9.2 8.8 8.4 5.5 8.0 -40 -10 20 50 80 110 140 -40 -10 20 Temperature(℃) 105 300 101 280 I_oper(uA) I_startup(uA) 110 140 I_oper vs Temperature 97 93 89 260 240 220 85 200 -40 -10 20 50 80 110 140 -40 -10 Temperature(℃) 20 50 80 110 140 110 140 Temperature(℃) Vth_oc vs Temperature Toff_time vs Temperature 550 6.0 530 5.8 Toff_time(us) Vth_oc(mv) 80 Temperature(℃) I_startup vs Temperature 510 490 470 5.6 5.4 5.2 450 5.0 -40 -10 20 50 80 110 140 -40 -10 Temperature(℃) 50 80 Ivdd vs VDD 300 30 Ivdd(uA) 25 20 15 250 Ivdd_off 200 Ivdd_on 150 100 50 10 5 -40 20 Temperature(℃) Rds_on(ohm )vs Tem perature Rds_on(ohm) 50 0 -10 20 50 80 110 0 140 2 3 4 5 6 7 8 9 10 VDD(V) Temperature( ℃) ©On-Bright Electronics 1 Confidential -5- Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED Power Switch OPERATION DESCRIPTION FSW  OB3652N is a primary side control offline LED lighting controller with very low operation current which can achieve accurate LED current for an isolated lighting application in a single stage converter. It significantly simplifies the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler, and also the auxiliary winding inductance. A HV 600V power switch is also integrated into the device.  Start up Control Startup process is realized by charging VDD capacitor. When VDD voltage reaches up to UVLO(OFF), the inner circuit works. An 10.5V (typical) clamp circuit is designed to clamp VDD voltage. At work state, no auxiliary winding inductance is necessary. Since TDemag is inversely proportional to the inductance, as a result, the product Lp and fsw is constant, thus output current will not change as primary winding inductance changes. Up to ± 10% variation of the primary winding inductance can be compensated. The output LED current is (3) 1 Vthoc Iout  N Rs 4 Where N is the ratio of transformer between primary-side winding and secondary winding.  Principle of CC Operation For flyback operating in DCM, the output current Iout is given by (1) 1 Iout  L F I  / Vout 2 Where Lp indicates the inductance of primary winding and Ip 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 Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB3652N. 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.  2 SW p ©On-Bright Electronics (2) 2TDemag Figure.1 Drain voltage waveform  Adjustable CC point In OB3652N, the CC point can be externally adjusted by external current sense resistor Rs at CS pin as illustrated in typical application diagram. The larger Rs is, the smaller CC point is, and vice versa. P 1  Latched Over Temperature Protection Over temperature protection is offered in OB3652N. When temperature of the device rises over 150℃ (typical), the switching frequency will decrease to half. And the state will be kept until the device restarts. Confidential -6- Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED Power Switch PACKAGE MECHANICAL DATA 8-Pin Plastic SOP Symbol A A1 A2 b c D E E1 e L θ ©On-Bright Electronics Dimensions In Millimeters Min Max 1.350 1.750 0.050 0.250 1.250 1.650 0.310 0.510 0.100 0.250 4.700 5.150 3.800 4.000 5.800 6.200 1.270 (BSC) 0.400 1.270 0º 8º Confidential -7- Dimensions In Inches Min Max 0.053 0.069 0.002 0.010 0.049 0.065 0.012 0.020 0.004 0.010 0.185 0.203 0.150 0.157 0.228 0.244 0.050 (BSC) 0.016 0.050 0º 8º Preliminary Datasheet OB_DOC_DS_3652N00 OB3652N High Precision Offline LED 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 -8- Preliminary Datasheet OB_DOC_DS_3652N00