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PD-6.087
IRP6VRM1
Turnkey Pentium Pro power supply specification
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 FETKYTM D2Pak 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 customer's design time and effort. 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 IR's 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.
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Figure 1. IRP6VRM1
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 * FETKYTM D2Pak synchronous rectifier * Evaluation kit available: IRP6VRM1-EV
Contents
Specifications ------------------------------------- 2 Schematic Diagram ----------------------------- 3 Bill of Materials --------------------------------- 4 Inductor Specifications ------------------------- 5 Assembly Options ------------------------------- 5 Static Performance ------------------------------ 5 Dynamic Performance -------------------------- 6 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.
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: A registered trademark of Intel Corporation
(c) International Rectifier, 1997
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IRP6VRM1 Specifications
Absolute maximum ratings
Parameter 5 volt input 12 volt input Continuous output current Pulsed output current Ambient Temperature Parameter 5 volt input (5Vin) 5 volt input current 12 volt input (12Vin) 12 volt input current Parameter Voltage Range Current Voltage regulation Min 4.75 11.8 Min 2.0 0 -5 Min 10 Typ 5.0 12.0 12.5 Typ -
(Table 1)
Max Units Conditions / Description 6.0 V 15.0 V 12.4 A Pulse width > 100ms 14 A 100ms pulse width, 1% duty factor 60 C Max Units Conditions / Description 5.25 V Supply meet all output specifications 10 A All line and load conditions 13.2 V Supply meets all output specifications 50 mA All line and load conditions Max Units Conditions / Description 3.5 V Selected by VID[0:3] 12.4 A +5 % Of nominal VID set point. Includes 30A/us transients from min-to-maxto-min load current +1 % Percent of set point. 10 mS Within 10% of VID set point Conditions / Description Open collector output. Logic 1 output signifies that the voltage output of the module is within 10% of the selected level Open collector input. Logic 0 disables the module output. Open. Not required in this module since the module has upgrade capability. Open collector input. Selects nominal output voltage as shown in table #2.
Electrical Input Specifications
Power Output Specifications (all specified line and load conditions)
VID Codes (Table 2) VccP VID3 VID2 VID1 VID0 Comments 2.0 1 1 1 1 No CPU 2.1 1 1 1 0 Optional 2.2 1 1 0 1 Optional 2.3 1 1 0 0 Optional 2.4 1 0 1 1 Optional 2.5 1 0 1 0 Optional 2.6 1 0 0 1 Optional 2.7 1 0 0 0 2.8 0 1 1 1 2.9 0 1 1 0 3.0 0 1 0 1 3.1 0 1 0 0 3.2 0 0 1 1 3.3 0 0 1 0 3.4 0 0 0 1 3.5 0 0 0 0
Ripple voltage Turn on settling time Signal PWRGD
-1 -
1.5
Fig 2. Connector pin out
Digital Input / Output Specifications
Input / Output output
OUTEN UP#
input input
VID[0:3]
input
Output Fault Protection
Parameter Short circuit protection Over voltage protection Min 13 +10 Typ 17 Max Units Conditions / Description 21 A Limits output current during short circuit or overload +20 % Shuts down the power supply when the output voltage exceeds 10%-to20% above the set point
Fig 4. Silk screen bottom view
Fig 3. Silk screen top view
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Schematic Diagram
Fig 5.
IRP6VRM1
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IRP6VRM1
Bill of Materials
(Table #3)
Manufacturers Novacap ------------------------------- (800) Panasonic ----------------------------- (800) National Semiconductor ----------- (800) Linear Technology ----------------- (714) Micrometals Inc --------------------- (714) International Rectifier ------------- (310) AMP ----------------------------------- (800) Sanyo ---------------------------------- (619)
227-2447 922-0028 272-9959 453-4650 970-9400 322-3331 522-6752 661-6835
Distributors Digi-Key ------------------------------ (800) 344-4539 Garrett --------------------------------- (800) 767-0081 Anthem ------------------------------- (714) 768-4444 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.
IRP6VRM1
Inductor Specifications
Inductor Drawing The specified inductor IR001, or optional IR002 can be purchased, assembled and tested (see BOM).
Fig 6. IR001 Fig 7. IR002
Assembly Options
Options For 8A Output (table #4) REF From To C4 1500UF Don't install C6, C8 1500UF Don't install Q1 IRL3103S IRL3303S Q2 IRL3103D1S IRL3303S L1 IR001 IR002 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 8. Typical Tj of Q1 @ Ta = 50C, still air
Static Performance
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. Maximum Junction Temperature Analysis of Q1 junction temperature shows that it remains within specifications at an ambient temperature of 50C, even in still air.
Fig 10. Typical Tj of Q1 @ Ta = 50C, still air
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IRP6VRM1
Dynamic Performance
Fig 11. Load Regulation, 2.1 Volts Out
Load Regulation The output must stay within its +5% specification from no load to full load.
Fig 12. Load Regulation, 3.5 Volts Out
Fig 13. Transient Load Current Rise Time CH4-2A/div
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 14. Transient Load Current Fall time CH4-2A/div
Fig 15. 100 Hz 3.5 Volts Output
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 16. 100 kHz 3.5 Volts Output
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IRP6VRM1
Dynamic Performance (continued)
Fig 17. 100Hz 2.1 Volts Output
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 18. 100kHz 2.1 Volts Output
Fig 19. Turn On Input Current Waveform CH4-2A/div M2-50mA/us/div
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
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IRP6VRM1
Dynamic Performance (continued)
Fig 21. 2.1 Volts Out, No 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 22. 3.5 Volts Out, Full Load
Fig 23. Turn on Waveform, 2.1 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 24. Turn on Waveform, 3.5 Volts Out
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