View FL7701_5746235.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

? 2012 fairchild semiconductor corporation 1 febFL7701_l30u003a ? rev.1.0.2 user guide for febFL7701_l30u003a 2.4w led ballast using FL7701 featured fairchild product: FL7701 direct questions or comments about this evaluation board to: ?worldwide direct support? fairchild semiconductor.com
? 2012 fairchild semiconductor corporation 2 febFL7701_l30u003a ? rev. 1.0.2 table of contents 1. ? introduction .................................................................................................................. ............. 3 ? 1.1. ? general description .......................................................................................................... 3 ? 1.2. ? key features .................................................................................................................. ... 3 ? 1.3. ? internal block diagram .................................................................................................... 4 ? 2. ? general specifications for evaluation board ........................................................................... 5 ? 3. ? photographs of the evaluation board ....................................................................................... 6 ? 4. ? printed circuit board ......................................................................................................... ....... 7 ? 5. ? schematic ..................................................................................................................... ............. 8 ? 6. ? bill of materials ............................................................................................................. ........... 9 ? 7. ? test condition & test equipment ............................................................................................ 9 ? 8. ? test waveforms ................................................................................................................ ...... 10 ? 8.1. ? typical waveforms: startup .......................................................................................... 10 ? 8.2. ? operating frequency & minimum duty .......................................................................... 11 ? 8.3. ? typical waveforms: steady state ................................................................................... 12 ? 8.4. ? typical waveforms: abnormal mode(led open) ........................................................ 15 ? 8.5. ? typical waveforms: abnormal mode (inductor short condition) ................................ 16 ? 9. ? performance of evaluation board ........................................................................................... 17 ? 9.1. ? power factor at rated load condition .......................................................................... 17 ? 9.2. ? system efficiency .......................................................................................................... 18 ? 9.3. ? thd performance .......................................................................................................... 19 ? 9.4. ? thermal performance ..................................................................................................... 20 ? 9.5. ? emi results ................................................................................................................... . 22 ? 10. ? revision history .............................................................................................................. ....... 24 ?
? 2012 fairchild semiconductor corporation 3 febFL7701_l30u003a ? rev. 1.0.2 this user guide supports the evaluation kit for the FL7701. it should be used in conjunction with the FL7701 datasheet as well as fairchild?s application notes and technical support team. please visit fairchild?s website at www.fairchildsemi.com . 1. introduction this document describes the proposed solution for a universal-input 2.4w led ballast using the FL7701. the input voltage range is 90v rms ? 265v rms and there is one dc output with a constant current of 85ma at 28v max . this document c ontains general description of FL7701, the power supply specification, schematic, bill of materials, and the typical operating characteristics. 1.1. general description the FL7701 led lamp driver is a simple ic with pfc function. the special ?adopted digital? technique automatically detects i nput voltage condition and sends an internal reference signal, resulting in high power factor . when an ac input voltage is applied to the ic, the pfc function is automatically enable d. otherwise, when a dc input is applied to the ic, the pfc function is automatically disabled. the FL7701 does not require a bulk capacitor (electrolytic capacito r) for supply rail stability, which can significantly affect led reliability. 1.2. key features ? digitally implemented active pfc function ? built-in self-biasing hv startup circuit ? application input range: 80v ac ~ 308v ac ? aocp function with auto-restart mode ? built-in over-temperature protection ? cycle-by-cycle current limit ? current-sense pin open protection ? low operating current: 0.85ma (typical) ? under-voltage lockout with 5v hysteresis ? programmable oscillator frequency ? programmable led current ? analog dimming function ? fixed soft-start function ? precise internal reference: 3%
? 2012 fairchild semiconductor corporation 4 febFL7701_l30u003a ? rev. 1.0.2 1.3. internal block diagram figure 1. internal block diagram pin descriptions pin symbol description 1 cs current sense . limits output current, depending on the sensing resistor voltage. the cs pin is also used to set the led current regulation. 2 out output . connects to the mosfet gate. 3 vcc supply voltage . supply pin for stable ic oper ation; zcd signal detection used for accurate pfc function. 4 rt resistor . programmable operating frequency using an external resistor connected to this pin and the ic has fixed frequency when this pin is left open or floating. 5 adim analog dimming . connects to the internal current source and can change the output current using an external resistor . if adim is not used, connect a 0.1f bypass capacitor between adim and gnd. 6 gnd ground . ground for the ic. 7 nc no connection 8 hv high voltage . connect to the high-voltage line and supply current to the ic
? 2012 fairchild semiconductor corporation 5 febFL7701_l30u003a ? rev. 1.0.2 2. general specifications for evaluation board all data for this table was measured at an ambient temperature of 25c table 1. summary of features and performance description symbol value comments input voltage range v in,min 90v v in,nom 220v v in,max 265v ac input frequency f in,min 47hz f in,max 64hz output voltage/current v out 28v note 1 i out 85ma output power output power 2.41w note 2 efficiency >78% at full load temperature t FL7701 < 71.5c at full load (all at open frame, room temperature / still air) t mosfet < 59.5c t inductor < 57.5c pcb size 20mm (width) x 32mm (length) x 13mm (height) initial application led bulb notes: 1. the output current has i ledpk ripple. to reduce ripple current, use a large electrolytic capacitor in parallel with the led. ensure th e capacitor voltage rating is high enough to withstand an open-led condition or use a zener diode for protection. 2. the output power is not equal to the apparent power due to the slight phase shift between the output voltage and current.
? 2012 fairchild semiconductor corporation 6 febFL7701_l30u003a ? rev. 1.0.2 3. photographs of the evaluation board figure 2. photograph top view (20mm x 32mm x 13mm) figure 3. photograph bottom view (20mm x 32mm x 13mm) figure 4. photograph side view (20mm x 32mm x 13mm)
? 2012 fairchild semiconductor corporat ion 7 febFL7701_l30u003a ? rev. 1.0.2 4. printed circuit board figure 5. pcb, top side figure 6. pcb, bottom side
? 2012 fairchild semiconductor corporation 8 febFL7701_l30u003a ? rev. 1.0.2 5. schematic figure 7. schematic of evaluation
? 2012 fairchild semiconductor corporation 9 febFL7701_l30u003a ? rev. 1.0.2 6. bill of materials qty reference part number value description manufacturer pcb silkscreen 1 u1 FL7701 controller fairchild semiconductor 1 bd mb6s 0.5a / 600v diode, bridge, 600v, 0.5a fairchild semiconductor 1 c1 mpe 630v223k 22nf capacitor, 630v ac , 10%, polypropylene sungho c1 1 c2 mpe 630v333k 33nf capacitor, 630v ac , 10%, polypropylene sungho c2 1 c3 c0805c101k3ractu 100pf capacitor, smd, ceramic, 25v, x7r kemet adim 1 c4 c1206c225k3pactu 2.2f capacitor, smd, ceramic, 25v, x7r kemet vcc 1 d1 uf4007 1a / 1kv diode, 1kv, 1a ultra-fast recovery fairchild semiconductor frd 1 d2 1n4148 1a / 100v 100v/1a, small-signal diode fairchild semiconductor 4148 2 l1, l2 r06153kt00 15mh inductor, radial, r6.5x7.5 bosung l1, l2 1 l3 r06402kt00 4mh inductor, radial, r6.5x7.5 bosung l3 1 r1 rc1206jr-07680rl 680r resistor,smd,1/4w,1206 yageo 1 r2 rc1206jr-0710kl 10k resistor,smd,1/4w,1206 yageo 1 r3 rc0805jr-0724kl 24k resistor,smd,1/8w,0805 yageo rt 1 r4 rc0805jr-07510rl 510r resistor,smd,1/8w,0805 yageo rg 1 r5 rc1206jr-073rl 3.0r resistor,smd,1/4w,1206 yageo rcs 7. test condition & test equipment evaluation board febFL7701_l30u003a test date 2012.01.19 test temperature t a = 25c test equipments ac source: pcr500l by kikusui power meter: pz4000 by yokogawa oscilloscope: waverunner 64xi by lecroy emi test receiver: escs30 by rohde & schwarz two-line v-network: env216 by rohde & schwarz thermometer: cam sc640 by flir systems led: ehp-ax08el/gt01h-p03 (3w) by everlight
? 2012 fairchild semiconductor corporation 10 febFL7701_l30u003a ? rev. 1.0.2 8. test waveforms 8.1. typical waveforms: startup figure 8 through figure 11 show the typical startup performance at different input voltage conditions. when ac input voltage is applied to the system, the FL7701 automatically operates in ac mode after finish ing an internally fixe d, seven-cycle, soft- start period. figure 10 and figure 11 show the soft-start characteristics when a dc input voltage is applied. ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 8. soft-start characteristics, ac mode, 90v ac ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 9. soft-start characteristics, ac mode, 265v ac ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 10. soft-start characteristics, dc mode, 100v dc ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 11. soft-start characteristics, dc mode, 200v dc
? 2012 fairchild semiconductor corporation 11 febFL7701_l30u003a ? rev. 1.0.2 8.2. operating frequency & minimum duty the programmable switching frequency is be tween 20khz ~ 250khz, determined by selecting the rt resistor value. if no rt resistor is used (rt pin open), the FL7701 default switching frequency is set to 45khz. the maximum duty ratio is fixed below 50% and has a fixed minimum typical on-time of 400ns. there are two crucial points to design properly. the first is consideration of the minimum duty ratio at minimum input voltage because the FL7701 is limited to 50% duty ratio. the second consideration is minimum on-time at maximum input voltage condition. the FL7701 cannot control output power when the operating conditions are such that the required on-time is less than the 400ns minimum on-time. ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 12. operating frequency & minimum duty minimum on time: 1.12s switching frequency: 69.91khz
? 2012 fairchild semiconductor corporation 12 febFL7701_l30u003a ? rev. 1.0.2 8.3. typical waveforms: steady state figure 13 through figure 22 show the normal operation waveform by input voltage & input frequency. the output voltage and curre nt maintains a certain output level with 120hz ripple, as shown in the test results in table 2. ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 13. input voltage: 90v ac , input frequency: 47hz ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 14. input voltage: 90v ac , input frequency: 64hz h1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 15. input voltage: 110v ac , input frequency: 47hz h1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 16. input voltage: 110v ac , input frequency: 64hz
? 2012 fairchild semiconductor corporation 13 febFL7701_l30u003a ? rev. 1.0.2 typical operating waveforms: output characteristics ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 17. input voltage: 180v ac , input frequency: 47hz ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 18. input voltage: 180v ac , input frequency: 64hz ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 19. input voltage: 220v ac , input frequency: 47hz ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 20. input voltage: 220v ac , input frequency: 64hz h1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 21. input voltage: 265v ac , input frequency: 47hz h1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 22. input voltage: 265v ac , input frequency: 64hz
? 2012 fairchild semiconductor corporation 14 febFL7701_l30u003a ? rev. 1.0.2 table 2. output characteristics by input voltage & frequency 47hz 64hz v led(rms) i led(rms) v led(rms) i led(rms) 90v ac 27.91v 84.45ma 27.90v 84.58ma 110v ac 27.99v 84.41ma 28.02v 84.49ma 180v ac 28.13v 84.94ma 28.10v 84.86ma 220v ac 28.12v 85.66ma 28.14v 85.77ma 265v ac 28.17v 87.05ma 28.13v 87.05ma
? 2012 fairchild semiconductor corporation 15 febFL7701_l30u003a ? rev. 1.0.2 8.4. typical waveforms: a bnormal mode (led open) figure 23 and figure 24 show the open-load condition test method and result. when the led disconnects from the system, the ic cannot operate because the hv pin is disconnected. figure 23. open-load condition test ch1: v cc , ch2: v drain , ch3: v led , ch4: i led figure 24. test results of open-load condition
? 2012 fairchild semiconductor corporation 16 febFL7701_l30u003a ? rev. 1.0.2 8.5. typical waveforms: abnor mal mode (inductor short condition) figure 25 and figure 26 show the test method and result of an inductor short condition. the FL7701 uses an abnormal over-current pr otection (aocp) function, limiting the current on rcs in the event of an inductor short condition. figure 25. inductor short condition ch1: v cs , ch2: v drain , ch3: v led , ch4: i led figure 26. test results of inductor short condition when cs pin voltage reached 2.5v, aocp operates after internal delay time 70ns (typical)
? 2012 fairchild semiconductor corporation 17 febFL7701_l30u003a ? rev. 1.0.2 9. performance of evaluation board 9.1. power factor at rated load condition figure 27 shows the system pf performance for the entire input voltage range (90v to 265v) at different input frequency conditions (47hz, 64hz). the pf slightly changes according to the input frequency but can achieve over 86% at 265v ac condition. figure 27. power factor table 3. pf test results input voltage power factor 90v ac 47hz 96.31 64hz 97.34 110v ac 47hz 96.72 64hz 96.89 180v ac 47hz 94.41 64hz 93.74 220v ac 47hz 92.49 64hz 91.09 265v ac 47hz 89.71 64hz 86.56 50 55 60 65 70 75 80 85 90 95 100 90 110 180 220 264 pf_47hz pf_64hz [ % ] [ v ac ]
? 2012 fairchild semiconductor corporation 18 febFL7701_l30u003a ? rev. 1.0.2 9.2. system efficiency figure 28 shows system efficiency results for different ac input voltage frequency conditions. as shown, the input frequency has negligible effect on system efficiency. figure 28. system efficiency table 4. efficiency test results input voltage frequency efficiency (%) 90v ac 47hz 83.56 64hz 83.83 110v ac 47hz 83.36 64hz 83.46 180v ac 47hz 80.04 64hz 80.06 220v ac 47hz 77.68 64hz 77.69 265v ac 47hz 75.11 64hz 75.22 50 55 60 65 70 75 80 85 90 95 100 90 110 180 220 264 efficiency_47hz efficiency_64hz [ % ] [ v ac ]
? 2012 fairchild semiconductor corporation 19 febFL7701_l30u003a ? rev. 1.0.2 9.3. thd performance figure 29 shows the thd performance at differe nt input frequencies. test results are quite similar, except the 90v ac condition, but meets international regulations (under 30%). figure 29. thd performance table 5. thd test results input voltage frequency thd (%) 90v ac 47hz 20.99 64hz 21.82 110v ac 47hz 22.26 64hz 22.46 180v ac 47hz 24.96 64hz 25.31 220v ac 47hz 25.50 64hz 25.84 265v ac 47hz 25.75 64hz 26.72 0 5 10 15 20 25 30 90 110 180 220 264 thd_47hz thd_64hz [ v ac ] [ % ]
? 2012 fairchild semiconductor corporation 20 febFL7701_l30u003a ? rev. 1.0.2 9.4. thermal performance figure 30 through figure 37 show the steady- state thermal results with different input voltage conditions. inductor l3 has the highest temperature on the top side of the pcb due to copper resistance. the FL7701 has the highest temperature on the bottom side of the pcb due to power loss associated with the high-voltage device. the ic temperature is 66.5c for the 220v ac input condition. figure 30. thermal test result, bottom-side temperature at 90v ac condition (ic) figure 31. thermal test result, top-side temperature at 90v ac condition (inductor) figure 32. thermal test result, bottom-side temperature at 110v ac condition (ic) figure 33. thermal test result, top-side temperature at 110v ac condition (inductor)
? 2012 fairchild semiconductor corporation 21 febFL7701_l30u003a ? rev. 1.0.2 figure 34. thermal test result, bottom-side temperature at 220v ac condition (ic) figure 35. thermal test result, top-side temperature at 220v ac condition (inductor) figure 36. thermal test result, bottom-side temperature at 264v ac condition (ic) figure 37. thermal test result, top-side temperature at 264v ac condition (inductor) table 6. temperature performance by input voltage input voltage t ic t mosfet t inductor 90v ac 47.6c 46.2c 47.8c 110v ac 51.4c 46.9c 47.8c 220v ac 66.5c 55.0c 54.6c 265v ac 71.5c 59.5c 57.7c
? 2012 fairchild semiconductor corporation 22 febFL7701_l30u003a ? rev. 1.0.2 9.5. emi results emi test measurements were conducted in ob servance of cispr22 criteria, which has tighter stricter limits than cispr15 for lighting applications. figure 38. emi test results, conducted emission-line at 110v ac input condition, full load (10-led series) figure 39. emi test results, conducted emission-neutral at 110v ac input condition, full load (10-led series)
? 2012 fairchild semiconductor corporation 23 febFL7701_l30u003a ? rev. 1.0.2 figure 40. emi test results, conducted emission-neutral at 220v ac input condition, full load (10-led series) figure 41. emi test results, conducted emission-neutral at 220v ac input condition, full load (10-led series)
? 2012 fairchild semiconductor corporation 24 febFL7701_l30u003a ? rev. 1.0.2 10. revision history rev. date description 0.0.1 2011.11.16 first issue 1.0.1 2011.11.30 update ic temperature 1.0.2 2012.2.20 modified, edited, formatted document. changed user guide number from feb_l030 to febFL7701_l30u003a warning and disclaimer replace components on the evaluation board only with those parts shown on the parts list (or bill of materials) in the users? g uide. contact an authorized fairchild representative with any questions. this board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. use at your own risk. the evaluation board (or kit) is for demonstration purposes only and neit her the board nor this user?s guide constitute a sales con tract or create any kind of warranty, whether express or implied, as to the applications or products involved. fairchil d warrantees that its products me et fairchild?s published specifications, but does not guarantee that its products work in any specific application. fairchild reserves the right to make changes without notice to any products described herein to improve reli ability, function, or design. either the applicable sales contract signed by fairc hild and buyer or, if no contract exists, fairchild?s standard terms and conditions on the back of fairchild invoic es, govern the terms of sale of the p roducts described herein. disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any licens e under its patent rights, nor the rights of others. life support policy fairchild?s products are not authorized for use as criti cal components in life su pport devices or systems without the express written approval of the presid ent of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. anti-counterfeiting policy fairchild semiconductor corporation's anti-counterfeiting policy. fa irchild's anti-counterfeiting policy is also stated on our external website, www.fairchildsemi.com, under sales support. counterfeiting of semiconductor parts is a growing problem in th e industry. all manufacturers of semiconductor products are exp eriencing counterfeiting of their parts. customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failed applications, and increased cost of production and manufacturing delays. fairchild is taking st rong measures to protect ourselves and our customers from the proliferation of counterfeit parts. fairchild st rongly encourages customers to pur chase fairchild parts either directly from fairchild or from authorized fairchild distributors who are listed by country on our web page cited above. products customers buy either from fairchild directly or from authorized fairchild distributors are genuine parts, have full traceability, meet fairch ild's quality standards for handling and storage and provide access to fairchild's full range of up-to-date technical and product information. fairchild an d our authorized distributors will stand behind all warranties and will appropriate ly address any warranty issues that may arise. fairchild will not provide any warranty coverage or other assistance for parts bough t from unauthorized sources. fairchild is committed to combat this global problem a nd encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors. export compliance statement these commodities, technology, or software were exported from the un ited states in accordance with the export administration re gulations for the ultimate destination listed on the commercial invoic e. diversion contrary to u.s. law is prohibited. u.s. origin products and products made with u.s. origin technology are subject to u.s re-export laws. in the event of re-export , the user will be responsible to ensure the appropriate u.s. export regulations are followed.

▲Up To Search▲

Price & Availability of FL7701

	To Download FL7701 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .