turnkey pentium pro 1 power supply specification key features ? conforms to intel 200mhz p6 specification ? 12.4 ampere continuous output ? 2.0v-to-3.5v digitally selectable output ? 30a/s transient load response capability ? meets pentium ii power requirements ? greater than 90% efficient ? short circuit protected ? fetky? d 2 pak synchronous rectifier ? evaluation kit available: IRP6VRM1-ev copyright restriction this design may be used for production or evaluation purposes under the condition that all ir labeling and identification marks remain on all boards produced using this design, or as otherwise agreed to in writing by international rectifier. purpose this is a production-ready design. it has been thoroughly tested for performance against the intel p6 power specification, and evaluated for manufacturability by a high volume manufacturer. this design will not be manufactured by international rectifier. its purpose is to simplify the design and qualification process for our customers. web site this design may be downloaded in two formats at irs web site (http://www.irf.com). one is pdf format for on screen viewing or printing, the other is in native format. floppy disk the design is also available on floppy disk. as on our web site, the floppy version contains two formats, pdf and native format. demo boards completed boards are available free to ir customers, and at a reasonable charge to others. support e-mail chris davis at cdavis1@irf.com for support of this design. IRP6VRM1 the new IRP6VRM1 offers the power supply designer a complete turnkey solution for dc/dc converters required to power next-generation microprocessors. a synchronous buck regulator topology operating at 200khz is employed and achieves excellent efficiency with very fast load response and tight output voltage regulation. the new fetky? d 2 pak is used in the synchronous recirculation circuitry to reduce board space and assembly costs while actually improving circuit efficiency through reduced stray inductance. complete performance characterization along with a detailed schematic, bill-of-materials, pcb layout and modeling are offered to reduce the customers design time and effort. pd-6.087 contents specifications ------------------------------------- 2 schematic diagram ----------------------------- 3 bill of materials --------------------------------- 4 inductor specifications ------------------------- 5 assembly options ------------------------------- 5 static performance ------------------------------ 5 dynamic performance -------------------------- 6 1 : a registered trademark of intel corporation ? international rectifier, 1997 figure 1. IRP6VRM1 www.irf.com 1
2 www.irf.com fig 3. silk screen top view vid codes (table 2) vccp vid3 vid2 vid1 vid0 comments 2.01111no cpu 2.11110 optional 2.21101 optional 2.31100 optional 2.41011 optional 2.51010 optional 2.61001 optional 2.71000 2.80111 2.90110 3.00101 3.10100 3.20011 3.30010 3.40001 3.50000 absolute maximum ratings (table 1) parameter min max units conditions / description 5 volt input - 6.0 v 12 volt input - 15.0 v continuous output current - 12.4 a pulse width > 100ms pulsed output current - 14 a 100ms pulse width, 1% duty factor ambient temperature 10 60 oc electrical input specifications parameter min typ max units conditions / description 5 volt input (5vin) 4.75 5.0 5.25 v supply meet all output specifications 5 volt input current - - 10 a all line and load conditions 12 volt input (12vin) 11.8 12.0 13.2 v supply meets all output specifica- tions 12 volt input current - 12.5 50 ma all line and load conditions power output specifications (all specified line and load conditions) parameter min typ max units conditions / description voltage range 2.0 - 3.5 v selected by vid[0:3] current 0 - 12.4 a voltage regulation -5 - +5 % of nominal vid set point. includes 30a/us transients from min-to-max- to-min load current ripple voltage -1 - +1 % percent of set point. turn on settling time - 1.5 10 ms within 10% of vid set point digital input / output specifications signal input / output conditions / description pwrgd output open collector output. logic 1 output signifies that the voltage output of the module is within 10% of the selected level outen input open collector input. logic 0 disables the module output. up# input open. not required in this module since the module has upgrade capability. vid[0:3] input open collector input. selects nominal output voltage as shown in table #2. output fault protection parameter min typ max units conditions / description short circuit protection 13 17 21 a limits output current during short circuit or overload over voltage protection +10 - +20 % shuts down the power supply when the output voltage exceeds 10%-to- 20% above the set point specifications fig 2. connector pin out fig 4. silk screen bottom view IRP6VRM1
www.irf.com 3 schematic diagram fig 5. IRP6VRM1
4 www.irf.com bill of materials distributors digi-key ------------------------------ (800) 344-4539 garrett --------------------------------- (800) 767-0081 anthem ------------------------------- (714) 768-4444 manufacturers novacap ------------------------------- (800) 227-2447 panasonic ----------------------------- (800) 922-0028 national semiconductor ----------- (800) 272-9959 linear technology ----------------- (714) 453-4650 micrometals inc --------------------- (714) 970-9400 international rectifier ------------- (310) 322-3331 amp ----------------------------------- (800) 522-6752 sanyo ---------------------------------- (619) 661-6835 pcb fabrication south coast circuits ---------------- (714) 966-2108 turn key manufacturing corlund electronics corporation (805) 499-6877 inductor winding pacific transformer ---------------- (714) 779-0450 delivery items used in this design were found to have production quantity lead times of under 10 weeks. most were well under 8 weeks. (table #3) IRP6VRM1
www.irf.com 5 options for 8a output (table #4) ref from to c4 1500uf dont install c6, c8 1500uf dont install q1 irl3103s irl3303s q2 irl3103d1s irl3303s l1 ir001 ir002 fig 8. typical t j of q1 @ t a = 50oc, still air 8 ampere design adaptation many motherboards do not require the full 12.4 ampere current output. in this case the IRP6VRM1 can be adapted to lower current levels by using the assembly options shown. these options will reduce cost by removing components and by using smaller die size mosfets. substitution of a mosfet for a fetky will reduce efficiency somewhat, but junction temperatures will still remain well within a safe limit. fig 9. average efficiency efficiency efficiency is required to be at least 80% at full load. thanks to the very efficient irl3103s and the fetky irl3103d1s, IRP6VRM1 exceeds the required specification by a wide margin. fig 10. typical t j of q1 @ t a = 50oc, still air maximum junction temperature analysis of q1 junction temperature shows that it remains within specifications at an ambient temperature of 50c, even in still air. inductor specifications assembly options inductor drawing the specified inductor ir001, or optional ir002 can be purchased, assembled and tested (see bom). static performance fig 6. ir001 fig 7. ir002 IRP6VRM1
6 www.irf.com load regulation the output must stay within its +5% specification from no load to full load. fig 11. load regulation, 2.1 volts out fig 12. load regulation, 3.5 volts out transient load at 3.5v out performance at 100khz is dominated by stray output inductance. this inductance is a combination of output capacitor esl and board / connector inductance. performance at 100hz is dominated by loop characteristics. limit 100hz 100khz min 3.325 3.354 3.351 max 3.675 3.530 3.519 fig 15. 100 hz 3.5 volts output fig 16. 100 khz 3.5 volts output dynamic performance fig 14. transient load current fall time transient load test conditions the intel specification requires the supply to stay within its 5% specification during transient load event of 0.3a-to-12.4a in 413ns. although most motherboards do not require this full level of performance, the IRP6VRM1 meets the full transient response specification. fig 13. transient load current rise time ch4-2a/div ch4-2a/div IRP6VRM1
www.irf.com 7 transient load at 2.1v out performance at 2.1 volts out is very similar to that at 3.5 volts. the notable exception is a reduction of the negative spike at the current rising edge. this is due to having more average voltage available to change the current in l1. limit 100hz 100khz min 1.995 2.028 2.004 max 2.205 2.176 2.163 fig 17. 100hz 2.1 volts output fig 18. 100khz 2.1 volts output fig 19. turn on input current waveform input di/dt during transient load the intel guideline (optional) specification calls for a maximum input di/dt during transient load of 0.1a/s. the IRP6VRM1 readily meets this specification at turn on, but falls short at turn off. this is common to all vrm boards evaluated by ir, regardless of manufacturer. it should not cause difficulties for most users, but if it is an issue for your design, add input inductance. fig 20. falling input current waveform ch4-2a/div m2-50ma/us/div ch4-2a/div m2-50ma/us/div dynamic performance (continued) IRP6VRM1
8 www.irf.com fig 24. turn on waveform, 3.5 volts out turn on transient output voltage must remain within 10% of the nominal set point. out limit measured 2.1v 2.31 2.12 3.5v 3.85 3.84 fig 23. turn on waveform, 2.1 volts out fig 22. 3.5 volts out, full load output ripple voltage output ripple voltage is specified as a maximum 2% p-p. out limit measured 2.1v 42mv 11mv 3.5v 70mv 16mv fig 21. 2.1 volts out, no load world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 322 3331 european headquarters: hurst green, oxted, surrey rh8 9bb, uk tel: ++ 44 1883 732020 ir canada: 7321 victoria park ave., suite 201, markham, ontario l3r 2z8, tel: (905) 475 1897 ir germany: saalburgstrasse 157, 61350 bad homburg tel: ++ 49 6172 96590 ir italy: via liguria 49, 10071 borgaro, torino tel: ++ 39 11 451 0111 ir far east 171 (k&h bldg.), 30-4 nishi-ikebukuro 3-chome, toshima-ku, tokyo japan tel: 81 3 3983 0086 ir southeast asia: 315 outram road, #10-02 tan boon liat building, singapore 0316 tel: 65 221 8371 http://www.irf.com/ data and specifications subject to change without notice. 3/97 dynamic performance (continued) IRP6VRM1
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