Application Note February 2002 AN9888.1 Author: Matt Harris

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Application Note February 2002 AN9888.1 Author: Matt Harris

Datasheet Thumbnail

Top Searches for this datasheet

HIP6302EVAL1 Multiphase Power Conversion Athlon Processors
Application Note February 2002 AN9888.1
Author: Matt Harris
Introduction
Each generation computer microprocessor brings performance advances computing power. Performance improvements made possible advances fabrication technology that enable greater device density. Newer processors operating lower voltages higher clock speeds both which contribute greater demands microprocessor core voltage supply terms higher peak currents higher current-slew rates. Intersil's family multi-phase DC-DC converter solutions provide ideal solution supply core-voltage needs present future high-performance microprocessors.
provides feedback droop compensation over-current protection. five-bit provides digital interface program accurate reference window comparator toggles PGOOD output voltage range acts protect load case over voltage. more detailed descriptions HIP6302 functionality, refer HIP6302 Data Sheet [1]. HIP6601A driver capable delivering gate-charging current rapidly switching both MOSFETs synchronous-rectified bridge. HIP6601A accepts single logic input control both upper lower MOSFETs. Adaptive shoot-through protection provided both switching edges provide optimal dead time, bootstrap circuitry permits greater enhancement upper MOSFET. more detailed description HIP6601A, refer HIP6601A Data Sheet [2].
Intersil HIP6302 HIP6601
HIP6302 controller works with HIP6601A HIP6603A single-channel driver single HIP6602A dual-channel driver form highly integrated solution high-current, high slew-rate applications. HIP6302 regulates output voltage, balances load currents provides protective functions synchronous-rectified buck-converter channels.
PGOOD POWER-ON RESET (POR) THREE STATE LATCH 1.15 CLOCK SAWTOOTH GENERATOR FS/DIS
PVCC
BOOT
UGATE
CONTROL LOGIC SHOOT THROUGH PROTECTION PHASE
VSEN
LGATE
FIGURE HIP6601A BLOCK DIAGRAM
SOFT START FAULT LOGIC COMP VID4 VID3 VID2 VID1 VID0
PWM1
PWM2
HIP6302EVAL1 Board Reference Design
With jumpers 1.7V (00110), evaluation board meets output voltage current specifications indicated Table
TABLE HIP6302EVAL1 OUTPUT PARAMETERS 1.75V 1.85V 2.00V 35A/µs
CURRENT DETECTION
ISEN1 ISEN2
Static Regulation Transient Regulation Over-Voltage Protection Continuous Load Current Over-Current Trip Level Load-Current Transient
1.65V 1.60V 1.90V
FIGURE HIP6302 BLOCK DIAGRAM
integrated high-bandwidth error amplifier provides voltage regulation, while current-sense circuitry maintains phase-current balance between power channels
CAUTION: These devices sensitive electrostatic discharge; follow proper Handling Procedures. 1-888-INTERSIL 321-724-7143 Intersil (and design) trademark Intersil Americas Inc. Copyright Intersil Americas Inc. 2002. Rights Reserved
Application Note AN9888
HIP6302EVAL1 evaluation board incorporates reference design intended meet core-voltage requirements Athlon microprocessors 35A. Additional circuitry provided facilitate circuit evaluation including input output power connectors, jumpers, numerous probe points, power-good indicator, load-transient generator.
Start
waveforms Figure demonstrate normal start-up sequence with HIP6302EVAL1 connected load. After FS/EN released, VCORE exhibits linear ramp until reaching 1.7V point. gradual increase VCORE over approximately limits current required from input supply, ICC5, level that does strain supply. HIP6302 asserts PGOOD once VCORE within regulation limits.
Powering HIP6302EVAL1
convenience, HIP6302EVAL1 provides methods making input power connections. 20-pin header, interfaces with standard power supply most convenient method powering board. standard banana-jack connectors that used supply power using bench-top power supplies. These inputs provide greater versatility testing design validation allowing power-input voltage levels varied independently. this power-on level power-sequencing issues easily examined. start evaluation board, insert 20-pin connector from supply into using bench-top supplies, connect supply supply Connect grounds from both supplies
FS/EN, 5V/DIV VCORE, 1V/DIV
ICC5, 10A/DIV
PGOOD, 5V/DIV
1ms/DIV
Important
There things consider when using bench-top supplies. supply applied prior supply, HIP6302 will begin operating before HIP6601As. This allows HIP6302 complete soft-start cycle before drivers capable switching power output. When power input then applied, there large transient controller tries instantly bring output fullvoltage level. This result overcurrent protection cycle abnormal start-up waveform. avoided applying supply after same time supply using power supply. second problem occur when operating transient load generator. bench-top power supplies capable responding load transients, they allow momentary voltage VCC5. This activate power-on-reset function HIP6302 cause output power cycle. remedied connecting 5600µF larger capacitor between VCC5 ground. capacitor, necessary, simulates distributed capacitance that exists computer motherboard.
FIGURE HIP6302EVAL1 START-UP WAVEFORMS
Transient Response
HIP6302EVAL1 equipped with load-transient generator that applies 0-36A transient load current with rise fall rates approximately 35A/µs. duration transient between 100µs 200µs, repetition rate kept order limit power dissipation load MOSFETs resistors. Removal HI/LO jumper (JP2) causes current decrease from about about 31A. load-transient generator operates when HIP6302EVAL1 properly connected power source position. Operation ceases when moved into position removed from board. HIP6302EVAL1 achieves specified transient performance while maintaining favorable balance between cost, high efficiency small profile. When duty cycle changes rapidly response transient load current, inductor current immediately begins change order meet demand. During time inductor current increasing, output-filter capacitors supplying load. follows that amount required capacitance decreases capability inductors rapidly assume load current increases.
Athlonis trademark Advanced Micro Devices, Inc.
Application Note AN9888
Figure shows core voltage, inductor current, signals changing response transient load current. upper waveform shows core voltage deviating from no-load setting 1.72V minimum about 1.62V upon application current. voltage then settles 1.67V full-load setting. load removal, core voltage peaks level 1.78V before settling again 1.72V no-load setting. Although specified operating range allows deviations 1.60V high 1.85V, minimum 20mV reserved allow reference tolerance tolerances other components that contribute overall system accuracy. close Figure shows core-voltage, inductorcurrent signals changing response trailing edge transient load current. Again, duty cycles immediately decrease zero, inductors begin shedding load current maximum rate. Note that inductor currents briefly negative transient settles. capacitors slightly over charged transient, discharge path reverse direction through inductors.
CORE VOLTAGE, 50mV/DIV 1.7V
CORE VOLTAGE, 50mV/DIV 1.7V INDUCTOR CURRENTS, 10A/DIV INDUCTOR CURRENTS, 10A/DIV PWM1, 10V/DIV PWM2, 10V/DIV 5µs/DIV
PWM1, 10V/DIV PWM2, 10V/DIV 20µs/DIV
FIGURE TRANSIENT-RESPONSE TRAILING EDGE
Overcurrent Protection
When current either ISEN exceeds 82µA, HIP6302 detects overcurrent condition responds placing outputs into high-impedance state. This signals HIP6601 turn both upper lower MOSFETs order remedy overcurrent condition.This behavior seen Figure where PWM1 goes immediately 2.5VDC when output current reaches approximately 50A. output voltage then quickly falls zero.
FIGURE HIP6302EVAL1 TRANSIENT RESPONSE
Figure close-up showing core-voltage, inductorcurrent signals responding leading edge transient load current. signals increase their maximum duty cycle first pulse following start transient. inductor currents begin increase immediately carrying load within 10µs. very fast transient response precision 18MHz error amplifier optimal compensation control loop.
1.7V CORE VOLTAGE, 50mV/DIV INDUCTOR CURRENTS, 10A/DIV
OUTPUT CURRENT, 20A/DIV
CORE VOLTAGE, 500mV/DIV
PWM1, 5V/DIV PWM1, 10V/DIV PWM2, 10V/DIV 50µs/DIV 5µs/DIV
FIGURE OVERCURRENT BEHAVIOR
FIGURE TRANSIENT-RESPONSE LEADING EDGE
Application Note AN9888
After initial over-current trip, HIP6302 waits period time equal 2048/fSW (fSW switching frequency) before initiating soft-start cycle. over-load condition remains, another over-current trip will occur before soft-start sequence. This repetitive overcurrent cycling illustrated Figure will continue indefinitely unless fault cleared power converter removed. Because wait period, worst case power delivered during overcurrent cycling equal power delivered during normal operation full load. Therefore, indefinite over-current cycling does create thermal problem circuit.
Summary
HIP6302EVAL1 intended provide convenient platform evaluate performance HIP6302 HIP6601A chip specific implementation indicated Table design demonstrates favorable trade between cost, high efficiency, small footprint. following pages include schematic, bill materials, layout drawings facilitate implementation this solution. evaluation board simple convenient operate, test points available evaluate most commonly tested parameters. Example waveforms given reference. HIP6302 HIP6601A provide versatile 2-phase power solution low-voltage applications from approximately 40A, together they result most effective solution available.
OUTPUT CURRENT, 20A/DIV
References
CORE VOLTAGE, 500mV/DIV
Intersil documents available internet, site http://www.intersil.com/ Intersil Technical Support (888) INTERSIL HIP6302 Data Sheet, Intersil Corporation, Power Management Products Division, 2000. (http://www.intersil.com/).
5ms/DIV
FIGURE OVERCURRENT BEHAVIOR
HIP6601A, HIP6603A Data Sheet, Intersil Corporation, Power Management Products Division, 2000. HIP6602A Data Sheet, Intersil Corporation, Power Management Products Division, 2000.
Efficiency
Figure shows efficiency versus current plot HIP6302EVAL1 through 35A. measurements were made room temperature with natural convection cooling only.
EFFICIENCY
CURRENT (AMPERES)
FIGURE EFFICIENCY CURRENT
Application Note AN9888 Schematic
5VIN 12VIN 0.1µF PWM1 PVCC 0.1µF HUF76139 450nH HUF76139 100µF 1000µF 100µF 1000µF
BOOT UGATE
PHASE
HIP6601
VID4 VID3 VID2 VID1 VID0 ISEN1 LGATE
2.15k
HIP6302
0.1µF PVCC BOOT UGATE HUF76139 450nH HUF76139
PGOOD
PWM2
PHASE
HIP6601
LGATE
FS/DIS 107k COMP 14.0k 2.2nF 45.3k C13-C17 22µF C18-C21 560µF ISEN2 VSEN 1.00k 2.15k
HUF76129 GREEN 2N7002 HUF76129 TP11 46.4k 2N7002 10µF
HIP2100
0.200
R14, 0.100
POWER GOOD INDICATOR
BAV99 1.50k TRANSIENT GENERATOR BAV99 1.50k
Application Note AN9888 Bill Materials
R10, R11, R14, C12, C13-C17, C19, C20, C22, C18, C24-C47 REFERENCE DESCRIPTION RED/GREEN 1000µF, 10V, Aluminum Capacitor 0.1µF, 25V, Y5V, Ceramic Capacitor 1.0µF, 25V, Y5V, Ceramic Capacitor 100µF, 16V, OS-CON Capacitor 2.2nF, 50V, X7R, Ceramic Capacitor 10µF, 10V, X7R, Ceramic Capacitor 560µF, OS-CON Capacitor Spare Spare Dual Diode 5-Position Jumper Header Jumpers 1-Position Header Jumper Power Header Female Banana Connector, Female Banana Connector, Black Terminal Connector 1uH, T30-26, AWG18 450nH, T60-8/90, AWG14 Power MOSFETs General Purpose MOSFET Power MOSFET Resistor, 2.15k, 1/10W Resistor, 107k, 1/10W Resistor, 14.0k, 1/10W Resistor, 1.00k, 1%,1/10W Resistor, 45.3k, 1/10W Resistor, 1.0k, 1/8W Resistor, 10k, 1/10W Resistor, 1.50k, 1/8W Resistor, 619, 1/8W Resistor, 0.100, Resistor, 0.200, Resistor, 46.4k, 1%,1/8W Resistor, 400, 1/8W Switch, SPDT 400x300mil 700x500mil TO-263AB SOT23 TO-252AA 0603 0603 0603 0603 0603 0805 0603 0805 0805 2512 2512 0805 0805 100mil Centers PACKAGE Radial 0603 0805 Radial 0603 1206 Radial Radial 1206 SOT23 100mil Centers Various Berg Berg Berg Berg Berg Johnson Components Johnson Components Burndy Falco Falco Intersil Various Intersil Various Various Various Various Various Various Various Various Various Vishay Vishay Various Various Components Jolo Keystone Tektronics 8-Lead SOIC 16-Lead SOIC 8-Lead SOIC Intersil Intersil Intersil GT11MSCKE SPCJ-123-01 1514-2 1314353-00 HIP6601ACB HIP6302CB HIP2100IB WSL2512R100FB43 WSL2512R200FB43 BAV99 68000-236 71363-102 68000-236 71363-102 39-29-9203 111-0702-001 111-0703-001 KPA8CTP TTIG0803-127 TTIB1506-478 HUF76139S3S 2N7002 HUF76129D3S VENDOR Lumex Panasonic Various Various Sanyo Various Various Sanyo 4SP560M 16SPS100M PART SSL-LXA3025IGC EEUFC1A102L
TP1, TP3, TP4, TP5, TP7, Small Test Point TP2, TP6, TP10 TP9, TP11 Large Test Point Probe Socket Synchronous Buck Driver Multiphase Buck Controller MOSFET Driver
Application Note AN9888 Layout Drawing Components
Application Note AN9888 Layout Drawing Copper
Application Note AN9888 Layout Drawing Ground Plane
Application Note AN9888 Layout Drawing Power Plane
Application Note AN9888 Layout Drawing Bottom Copper
Intersil U.S. products manufactured, assembled tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications viewed www.intersil.com/design/quality
Intersil products sold description only. Intersil Corporation reserves right make changes circuit design, software and/or specifications time without notice. Accordingly, reader cautioned verify that data sheets current before placing orders. Information furnished Intersil believed accurate reliable. However, responsibility assumed Intersil subsidiaries use; infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Intersil subsidiaries.
information regarding Intersil Corporation products, www.intersil.com

Application Note February 2002 AN9888.1 Author: Matt Harris

Top Searches for this datasheet

Other recent searches