BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 1 bright power semiconductor co. confidential ? customer use only description the BP3102 is a high precision primary-side feedback and regulation controller for led lighting, it operates in constant current control mode and is designed to work in inductor current discontinuous conduction mode and extremely suitable for flyback convertor under universal input, the output power of system should be less than 5w. the BP3102 integrates 600v power mosfet. since adopting primary sense and feedback control technology, the secondary se nse and feedback circuit is eliminated. the loop compensation components are also removed while maintaining stability overall operating conditions. the low component counts and low bom cost are realized. since using the proprietary high accurate current sense method, the BP3102 realizes 3% accuracy of led current along with excellent line regulation and load regulation. the BP3102 offers rich protection functions including led short circuit protection, led open circuit protection, die over-temperature protection, vcc over voltage protection, vcc under voltage protection and fb short circuit protection. all the protection features are auto-recovery. features ? built-in 600v power mosfet ? constant current control without secondary sense and feedback circuit. ? 3% led current accuracy ? ultra low operating current to improve efficiency ? high resistance feedback resistor to improve efficiency ? universal input voltage ? led short and open circuit protection ? vcc under-voltage protection ? feedback loop short circuit protection ? current sense resistor open circuit protection ? over temperature protection ? no external loop compensation component required ? available in sop-8 package applications ? gu10/e27 led bulb, spot light ? other led lighting typical application figure 1. typical application circuit for BP3102 www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 2 bright power semiconductor co. confidential ? customer use only ordering information part number package operating temperature package method marking BP3102 sop8 -40 to 105 tape 2,500 piece/roll BP3102 xxxxxy zwxyy pin configuration and marking information figure 2. pin configuration pin definition pin no. name description 1 gnd ground 2 fb feedback. this pin detects the output information from auxiliary winding. 3 vcc power supply 4 cs current sense. this pin connects a current sense resistor to gnd to detect the primary current of transformer. 5,6 drain internal high voltage mosfet drain. 7,8 nc no connection, must be floated xxxxxy: lot code z: r rohs) g green) w: sign x: year yy week www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 3 bright power semiconductor co. confidential ? customer use only absolute maximum ratings (note1) symbol parameters range units v cc vcc pin input voltage -0.3~20 v fb feedback pin input voltage -0.3~6 v drain internal mosfet drain voltage -0.3~600 v cs current sense pin input voltage -0.3~6 v p dmax power dissipation (note2) 0.45 w ja thermal resistance (junction to ambient) 145 /w t j operating junction temperature -40 to 150 t stg storage temperature range -55 to 150 esd (note3) 2 kv note 1: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. under ?recommended ope rating conditions? the device operation is assured, but some particular parameter may not be achieved. the electri cal charac teristics table defines the operation range of the device, the electrical characteristics is assured on dc and ac voltage by test program. for the parameters without minimum and maximum value in the ec table, the typical value defines the operation range, the accuracy is not guaranteed by spec. note 2: the maximum power dissipation decrease if temperature rise, it is decided by t jmax , ja , and environment temperature (t a ). the maximum power dissipation is the lower one between p dmax = (t jmax - t a )/ ja and the number listed in the maximum table. note 3: human body mode, 100pf capacitor discharge on 1.5k ? resistor recommended operation conditions symbol parameter range unit v cc power supply voltage 7.5 ~14.5 v p out1 output power (input voltage 230v15%) <5 w p out2 output power (input voltage 85v 265v) <4 w www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 4 bright power semiconductor co. confidential ? customer use only electrical characte ristics(notes 4,5) (unless otherwise specified, v cc =12v and t a =25 ) symbol parameter conditions min. typ. max. units supply voltage section v cc-th turn on threshold voltage v cc rising 13 14 15 v v uvlo turn of threshold voltage 6.5 v v ovp vcc over voltage protection level 16 v v cc_ clamp zener diode clamped voltage i cc =10ma 19 v current sense section v cs-th threshold voltage for peak current limit 490 500 510 mv t leb leading edge blanking time for current sense 500 ns t delay switch off debounce time 200 ns operation current section i st start up current v cc = v cc-th - 1v 25 50 ua i op operating current f op =40khz 1.5 ma feedback section v fb fb voltage sense level 1 v t demag _min minimum demagnetization time 4 us v cs / i fbup line compensation ratio (note 6) 1.1 mv/ua maximum duty cycle d max maximum duty cycle 42 % over temperature protection t sd thermal shutdown threshold 150 t sd-hys thermal shutdown hysteresis 20 www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 5 bright power semiconductor co. confidential ? customer use only symbol parameter conditions min. typ. max. units mosfet section r ds_on static drain-source on-resistance v gs =10v/i ds =0.5a 13 ? bv dss drain-source breakdown voltage v gs =0v/i ds =250ua 600 v i dss drain-source leakage current v gs =0v/v ds =600v 200 na note 4 : production testing of the chip is performed at 25c. note 5: the maximum and minimum parameters specified are guaranteed by test, the typical value are guaranteed by design, characterizat ion and statistical analysis note 6: refer to application information typical performance characteristics turn on threshold vs. temperature turn off threshold vs. temperature www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 6 bright power semiconductor co. confidential ? customer use only ovp threshold vs. temperature start-up current vs. temperature vcs threshold vs temperature www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 7 bright power semiconductor co. confidential ? customer use only internal block diagram figure 3. BP3102 internal block diagram function description the BP3102 is a high performance power switch specially designed for led lighting, it uses the patent constant current control technology of bps. the BP3102 integrates a 600v power mosfet. the accurate led current can be realized without opto-coupler and tl431 feedback circuit while minimizing the external component count, lowering the total bill of material cost. start up the start-up current in BP3102 is designed to as low as 25ua. the v cc capacitor will be charged through the start-up resistor when the system is powered on, once the voltage on v cc reaches the start-up threshold, the BP3102 will start to operate, and then the v cc is supplied by the auxiliary winding. constant current control cycle-by-cycle current sense is offered in BP3102, the cs is connected to the current sense comparator, and the voltage on cs will be compared with the internal 500mv reference voltage, the mosfet will be switched off when the voltage on cs reaches the threshold. the output of the comparator also includes a 500ns leading edge blanking time the primary peak current is given by: ) ( 500 p_pk ma r i cs = the current in led can be calculated by the equation: www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 8 bright power semiconductor co. confidential ? customer use only s p out n n i i = 4 p_pk where, n p : primary winding turns of transformer n s : secondary winding turns of transformer i p_pk : peak current in mosfet feedback network the BP3102 senses the output information through the feedback network and the fb threshold voltage is set to 1v. the ratio of fb upper resistor to lower resistor is recommended to about 4.0. the fb upper resistor can be set to 300k ? ~750k ? to improve efficiency of convertor. the upper resistor on fb is also used for line compensation. the ratio of line compensation can be calculated by the equation: () mv r v v fbh aux cs ? = 6 10 1 . 1 where, r fbh is the upper resistor of the feedback network. operation switching frequency the BP3102 is designed to work in discontinuous conduction mode and no external loop compensation component is required while maintaining stability. the maximum duty cycle is limited to 42%. the maximum switching frequency should be set to less than 100khz and the minimum switching frequency should be set to more than 20khz. the maximum and minimum switching frequency is limited in BP3102 to ensure the stability of system. the switching frequency can be set by the formula: led led i lp ns v np f = 2 2 8 where, lp is the primary winding inductance of transformer. protection function the BP3102 has several protection functions. the internal mosfet will be shut down immediately when the voltage on v cc reaches the threshold of ovp and the device will not recover until the protection condition is removed. a 19v zener diode is designed in the BP3102 to prevent the chip damage from the abnormal situation. the thermal shutdown circuitry in the BP3102 senses the die temperature after start up, and the thermal protection threshold is set to 150 with a 20 hysteresi s. when the temperature on die of BP3102 rises and reaches th e threshold, the power mosfet will be shut down immediately and maintained switch off until the temperature on die falls 20 from thermal protection trigger point. the system will work in low consumption mode when the output led short circuit or open circuit is detected, while the BP3102 continuous to detect output status until the led recover to normal condition, and then the de vice will be operate in normal mode. pcb layout the following rules should be followed in BP3102 pcb layout: bypass capacitor the bypass capacitor on v cc should be as close as possible to the v cc pin ground path the power ground path for current sense should be short, and the power ground path should be separated from small signal ground path before the negative of the bulk capacitor. the area of power loop the area of main current loop should be as small as possible to reduce emi radiation, such as the primary current loop, the snubber circuit and the secondary rectifying loop. www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 9 bright power semiconductor co. confidential ? customer use only nc pin the nc pin must be left floating to satisfy the requirement of creepage distance. drain pin to increase the copper ar ea of drain for thermal consideration. fb pin the feedback divider should be as close as possible to fb pin and the node must keep away from dynamic node of transformer. www.datasheet.net/ datasheet pdf - http://www..co.kr/
BP3102 high precision psr cons tant current led driver BP3102_ds_rev.1.0 www.bpsemi.com 10 bright power semiconductor co. confidential ? customer use only physical dimensions www.datasheet.net/ datasheet pdf - http://www..co.kr/
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