SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005 8-A, INPUT NONISOLATE
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
8-A, INPUT NONISOLATED WIDE-OUTPUT ADJUST MODULE
FEATURES
APPLICATIONS
Multivoltage Digital Systems High-Density Logic Circuits High-End Computers Servers Intermediate Architectures
Output Current Input Wide-Output Voltage Adjust (0.8 Efficiencies On/Off Inhibit Prebias Start-Up Undervoltage Lockout Auto-TrackSequencing Output Overcurrent Protection (Nonlatching, Auto-Reset) Operating Temperature: -40°C 85°C Safety Agency Approvals: UL/cUL 60950, EN60950 POLACompatible
DESCRIPTION
PTV05010W ready-to-use nonisolated power module, part class complete dc/dc switching regulators from Texas Instruments. These regulators combine high performance with double-sided, surface-mount construction, give designers flexibility power most complex multiprocessor digital systems using off-the-shelf catalog parts. PTV05010W series produced 8-pin, single in-line (SIP) package. footprint minimizes board space, offers alternate package option space conscious applications. Operating from input bus, series provides step-down conversion wide range output voltages, output current. output voltage value over range, using single external resistor. This series includes Auto-TrackTM. Auto-Tracksimplifies task supply-voltage sequencing power system enabling output voltage multiple modules accurately track each other, external voltage, during power power down. Other operating features include on/off inhibit, ability start into existing output voltage prebias. nonlatching overcurrent trip protects against load faults. Target applications include complex multivoltage, multiprocessor systems that incorporate industry's high-speed microprocessors, drivers, TMS320DSP family.
Please aware that important notice concerning availability, standard warranty, critical applications Texas Instruments semiconductor products disclaimers thereto appears this data sheet. POLA, Auto-Track, TMS320 trademarks Texas Instruments.
Copyright 2005, Texas Instruments Incorporated
PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters.
PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
These devices have limited built-in protection. leads should shorted together device placed conductive foam during storage handling prevent electrostatic damage gates.
STANDARD APPLICATION
Track Track Inhibit (Required) Ceramic (Required) PTV05010 RSET# 0.05 (Required) (Optional) Ceramic (Optional)
Inhibit
Application Information capacitor recommendations RSET required adjust output voltage higher than lowest value. Application Information section values.
ORDERING INFORMATION
most current package ordering information, Package Option Addendum this data sheet, website www.ti.com.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted
UNIT V(Track) Tstg V(INH) Track input voltage Operating temperature range Lead temperature Storage temperature Inhibit input voltage Over range seconds -0.3 +0.3 -40°C 85°C 260°C
-55°C 125°C -0.3
Stresses beyond those listed under absolute maximum ratings cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under recommended operating conditions implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. This product compatible with surface-mount reflow solder processes.
PACKAGE SPECIFICATIONS
PTV05010W (Suffix Weight Flammability Mechanical shock Mechanical vibration Qualification limit. Meets Mil-STD-883D, Method 2002.3, sine, mounted Mil-STD-883D, Method 2007.2, 2000
grams
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
ELECTRICAL CHARACTERISTICS
operating 25°C free-air temperature, (unless otherwise noted)
PARAMETER Output current Input voltage range Set-point voltage tolerance Temperature variation Line regulation Load regulation Total output variation Adjust range -40°C 85°C Over range Over range Includes set-point, line, load, -40°C 85°C Over range RSET RSET 2.21 Efficiency RSET 5.49 RSET 8.87 RSET 17.4 RSET 36.5 Output voltage ripple (pk-pk) (trip) Overcurrent threshold 20-MHz bandwidth Reset, followed auto-recovery 1-A/µs load step, 100% max, Transient response Recovery time over/undershoot Track control (pin Input current Control slew-rate limit increasing decreasing Input high voltage Inhibit control (pin Input voltage Input current (stby) Input standby current Switching frequency External input capacitance Over ranges Nonceramic (C1) Ceramic (C2) Capacitance value Equivalent series resistance (nonceramic) MTBF Reliability Telcordia SR-332, stress, 40°C, ground benign Nonceramic Ceramic Referenced -0.2 0.24
TEST CONDITIONS Natural convection airflow Over load range
UNIT
0.5%
mVPP -0.13 V/ms
(max)
UVLO
Undervoltage lockout
Open
Inhibit (pin GND, Track (pin open
3300
External output capacitance (C3)
thermal derating curves safe operating area (SOA), consult factory appropriate derating. set-point voltage tolerance affected tolerance stability RSET. stated limit unconditionally RSET tolerance with ppm/°C better temperature stability. This control internally pulled input voltage, this input left open circuit, module will operate when input power applied. small low-leakage MOSFET recommended control. further information, related application note. 10-µF high-frequency ceramic capacitor 100-µF electrolytic input capacitor required proper operation. electrolytic capacitor must rated mArms minimum ripple current. Application Information further guidance capacitor selection. external output capacitor required basic operation. Adding distributed capacitance load improves transient response. This calculated maximum. minimum limitation often results lower value. When controlling Track using voltage supervisor, CO(max) reduced 2200 Application Information further guidance. This typical electrolytic (nonceramic) output capacitance. minimum when using maximum-ESR values calculate.
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
TYPICAL CHARACTERISTICS (5-V INPUT)
EFFICIENCY OUTPUT CURRENT
Output Ripple Voltage mVPP
OUTPUT VOLTAGE RIPPLE OUTPUT CURRENT
Efficiency
Output Current
Output Current
Figure POWER DISSIPATION OUTPUT CURRENT
Power Dissipation
Figure TEMPERATURE DERATING OUTPUT CURRENT
Temperature
Conv
Flow
Output Current
Output Current
Figure
Figure
electrical characteristic data been developed from actual products tested 25C. This data considered typical converter. Applies Figure Figure Figure temperature derating curves represent conditions which internal components below manufacturer's maximum operating temperatures. airflow direction parallel long axis module. Derating limits apply modules soldered directly double-sided with copper. Applies Figure
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
DEVICE INFORMATION
TERMINAL FUNCTIONS
TERMINAL NAME DESCRIPTION positive input voltage power node module, which referenced common GND. regulated positive power output with respect node. This common ground connection power connections. also 0-Vdc reference control inputs. Both pins must connected common ground. Inhibit open-collector/drain, active-low input that referenced GND. Applying low-level ground signal this input disables module's output turns output voltage. When Inhibit control active, input current drawn regulator significantly reduced. inhibit feature used, control should left open-circuit. module then produces output voltage whenever valid input source applied. 0.5% resistor must connected directly between this (pin recommended) output voltage module higher than lowest value. temperature stability resistor should ppm/°C better). set-point range resistor value calculated using formula. this input left open-circuit, output voltage defaults lowest value. further information, consult related application note. specification table gives standard resistor values number common output voltages. This analog control input that enables output voltage follow external voltage. This becomes active typically after input voltage been applied, allows direct control output voltage from nominal set-point voltage. Within this range, output follows voltage Track volt-for-volt basis. When control voltage raised above this range, module regulates set-point voltage. feature allows output voltage rise simultaneously with other modules powered from same input bus. unused, this input should connected NOTE: undervoltage lockout feature, output module cannot follow input voltage during power Consult related Application Information further guidance. Front View Module
Inhibit
Adjust
Track
Figure Terminal Locations
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
APPLICATION INFORMATION Capacitor Recommendations PTV05010W Power Module
Input Capacitors required input capacitors 10-µF ceramic minimum 100-µF electrolytic type. 100-µF capacitance must rated mArms ripple current capability. Table above ripple current requirements conditional that 10-µF ceramic capacitor present. 10-µF X5R/X7R ceramic capacitor necessary reduce both magnitude ripple current through electroytic capacitor amount ripple current reflected back input source. Ceramic capacitors should located within inch. (1,3 module's input pins. Additional ceramic capacitors added reduce ripple current requirement electrolytic capacitor. Ripple current (rms) rating, less than 150-m equivalent series resistance (ESR), temperature major considerations when selecting input capacitors. Unlike polymer-tantalum capacitors, regular tantalum capacitors have recommended minimum voltage rating (max. voltage ripple). This standard practice ensure reliability. Only tantalum capacitors were found have sufficient voltage rating meet this requirement. temperatures below 0°C, aluminum electrolytic capacitors increases. these applications, Os-Con, polymer-tantalum, polymer-aluminum types should considered. Output Capacitor (Optional) applications with load transients (sudden changes load current), regulator response benefits from external output capacitance. recommended output capacitance allows module meet transient response specification. most applications, high-quality computer-grade aluminum electrolytic capacitor adequate. These capacitors provide decoupling over frequency range, kHz, suitable when ambient temperatures above 0°C. operation below 0°C, tantalum-, ceramic-, Os-Con-type capacitors recommended. When using more nonceramic capacitors, calculated equivalent should lower than using manufacturer's maximum single capacitor). list preferred low-ESR-type capacitors identified Table Ceramic Capacitors Above kHz, performance aluminum electrolytic capacitors less effective. Multilayer ceramic capacitors have resonant frequency higher than bandwidth regulator. They used reduce reflected ripple current input well improve transient response output. When used output, their combined critical long total value ceramic capacitance does exceed approximately Also, prevent formation local resonances, place more than five identical ceramic capacitors parallel with values greater. Tantalum Capacitors Tantalum-type capacitors only used output bus, recommended applications where ambient operating temperature less than 0°C. TPS, Sprague 593D/594/595 Kemet T495/T510 capacitor series suggested over many other tantalum types their higher rated surge, power dissipation, ripple current capability. caution, many general-purpose tantalum capacitors have considerably higher ESR, reduced power dissipation, lower ripple current capability. These capacitors also less reliable they have reduced power dissipation surge current ratings. Tantalum capacitors that have stated surge current rating recommended power applications. When specifying Os-con polymer tantalum capacitors output, minimum limit encountered before maximum capacitance value reached.
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
Capacitor Table Table identifies characteristics capacitors from number vendors with acceptable ripple current (rms) ratings. recommended number capacitors required both input output buses identified each capacitor type. Note: This extensive capacitor list. Capacitors from other vendors available with comparable specifications. Those listed guidance. ripple current rating kHz) critical parameters necessary ensure both optimum regulator performance long capacitor life. Table Input/Output Capacitors
Capacitor Characteristics Capacitor Vendor, Type/Series (Style) Working Voltage Value (µF) 0.117 0.117 0.16 Ripple Current 85°C (Irms) (mA) Physical Size (mm) 11.5 11,5 10.2 12,5 11,5 10.5 3225 3225 3225 3225 Input Quantity Optional Output Vendor Part Number
Panasonic, Aluminum Radial) (SMD) United Chemi-Con PSA,Poly-Alum (Radial) LXZ, Alum (Radial) MVZ, Alum (SMD) PXA, Poly-Alum (SMD) Nichicon, Aluminum (Radial) Sanyo Poscap SEQP, Os-Con (Radial) SVP, Os-Con (SMD) AVX, Tantalum, (SMD) Kemet (SMD) T520, Poly-Tant T530, Poly-Tant/Organic Vishay-Sprague 94SVP 595D, Tantalum (SMD) 94SA, Os-Con (Radial) Kemet, Ceramic (SMD)
EEUFC1A331 EEUFC1C221 EEVFK0J471P
0.02 0.12 0.09 0.027 0.09 0.072
3160 2800
PSA6.3VB220MF11 LXZ10VB471M8X12LL MVZ16VC681MJ10TP PXA10VC121MH70TP UPM1C271MHH6 UHD1A471MPR
0.025 0.035 0.04 0.075 0.05
2400 >2500 1810 >1090 >1559
10TPE220M 10SEQP120M 6SVP100M TPSC107M010R0075 TPSD157M010R0050
0.055 0.01 0.04 0.14 0.03 0.002 0.002 0.002 0.002
1500 >3800 2120 1040 2670
T520D107M010ASE055 T530X337M010ASE010 94SVP127X0010E7 595D227X0010D2T 94SA107X0010EBP C1210C106M4PAC C1210C226K9PAC C1210C476K9PAC GRM32ER60J107M GRM32ER60J476M GRM32ER61C226K GRM32DR61C106K C3225X5R0J107MT C3225X5R0J476MT C3225X5R1C226MT C3225X5R1C106MT
Murata, Ceramic (SMD)
TDK, Ceramic (SMD)
0.002
3225
Capacitor Supplier Verification Please verify availability capacitors identified this table. Capacitor suppliers recommend alternative part numbers because limited availability obsolete products. some instances, capacitor product life cycle decline have short-term consideration obsolescence. RoHS, Lead-free Material Details Please consult capacitor suppliers regarding material composition, RoHS status, lead-free status, manufacturing process requirements. Component designators part number deviations occur when material composition soldering requirements updated. Ceramic capacitors required complement electrolytic types input reduce high-frequency ripple current. Submit Documentation Feedback Product Folder Link(s) :PTV05010W
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
Designing Fast Load Transients transient response dc/dc converter been characterized using load transient with di/dt A/µs. typical voltage deviation this load transient given data sheet specification table using optional value output capacitance. di/dt transient increased, response converter regulation circuit ultimately depends output capacitor decoupling network. This inherent limitation with dc/dc converter once speed transient exceeds bandwidth capability. target application specifies higher di/dt lower voltage deviation, requirement only with additional output capacitor decoupling. these cases, special attention must paid type, value, capacitors selected. transient performance requirements exceed that specified data sheet, total amount load capacitance above 3000 selection output capacitors becomes more important.
Adjusting Output Voltage
Adjust control (pin sets output voltage PTV05010W product value over range, adjustment method requires addition single external resistor, RSET, that must connected directly between Adjust regulator's output (pin recommended). Without adjust resistor, output voltage lowest value. Table gives preferred value external resistor number standard voltages, along with actual output voltage that this resistance value provides. Figure shows placement required resistor. Table Nearest Standard Values RSET Common Output Voltages
(Required) RSET (Standard Value) 2.21 4.12 5.49 8.87 17.4 36.5 Open (Actual) 3.309 2.502 2.010 1.803 1.504 1.202 1.005 0.800
other output voltages, value required resistor either calculated simply selected from range values given Table Equation used calculating adjust resistor value.
2.49
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
PTV05010W
RSET,
Figure Adjust Resistor Placement Table Calculated Values RSET Other Output Voltages
0.800 0.825 0.850 0.875 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 1.125 1.150 1.175 1.200 1.225 1.250 1.300 1.350 1.400 RSET Open 77.5 61.5 50.8 43.2 37.5 33.1 29.5 26.6 24.2 22.1 20.4 18.8 17.5 16.3 15.3 13.5 12.1 10.8 1.450 1.500 1.550 1.600 1.650 1.700 1.750 1.800 1.850 1.900 1.950 2.000 2.050 2.100 2.150 2.200 2.250 2.300 2.350 2.400 2.450 2.500 RSET 9.82 8.94 8.18 7.51 6.92 6.40 5.93 5.51 5.13 4.78 4.47 4.18 3.91 3.66 3.44 3.22 3.03 2.84 2.67 2.51 2.36 2.22 2.550 2.600 2.650 2.700 2.750 2.800 2.850 2.900 2.950 3.000 3.050 3.100 3.150 3.200 3.250 3.300 3.350 3.400 3.450 3.500 3.550 3.600 RSET 2.08 1.95 1.83 1.72 1.61 1.51 1.41 1.32 1.23 1.15 1.07
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Features PTH/PTV Family Non-Isolated, Wide-Output Adjust Power Modules
POLACompatibility PTH/PTV family non-isolated, wide-output adjustable power modules from Texas Instruments optimized applications that require flexible, high-performance module that small size. Each these products POLAcompatible. POLA-compatible products produced number manufacturers, offer customers advanced, non-isolated modules with same footprint form factor. POLA parts also ensured interoperable, thereby providing customers with true second-source availability. Soft-Start Power Auto-Track feature allows power multiple PTH/PTV modules directly controlled from Track pin. However, stand-alone configuration, when Auto-Track feature being used, Track should directly connected input voltage, (see Figure
Track
PTV05010W
Adjust
RSET 5.49 0.05
Figure Power-Up Application Circuit When Track connected input voltage, Auto-Track function permanently disengaged. This allows module power entirely under control internal soft-start circuitry. When power under soft-start control, output voltage rises set-point quicker more linear rate.
V/div)
V/div)
A/div)
Time ms/div
Figure Power-Up Waveform
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SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
From moment valid input voltage applied, soft-start control introduces short time delay (typically 15ms) before allowing output voltage rise. output then progressively rises module set-point voltage. Figure shows soft-start power-up characteristic PTV05010W, operating from input configured 1.8-V output. waveforms were measured with resistive load Auto-Track feature disabled. initial rise input current when input voltage first starts rise charge current drawn input capacitors. Power complete within Overcurrent Protection (OCP) protection against load faults, modules incorporate output overcurrent protection. Applying load that exceeds overcurrent threshold causes regulated output shut down. Following shutdown, module periodically attempts recover initiating soft-start power This described hiccup mode operation, whereby module continues cycle successive shutdown power until load fault removed. During this period, average current flowing into fault significantly reduced. Once fault removed, module automatically recovers returns normal operation. Output On/Off Inhibit applications requiring output voltage on/off control, modules incorporate output Inhibit control pin. inhibit feature used wherever there requirement output voltage from regulator turned off. power modules function normally when Inhibit input left open-circuit, providing regulated output whenever valid source voltage connected with respect GND. Figure shows typical application inhibit function. Note discrete transistor (Q1). Inhibit input internal pullup (see footnotes electrical characteristics table). input compatible with logic devices. open-collector open-drain) discrete transistor recommended control.
Track PTV05010W VOAdj
Inhibit
BSS138 RSET
Inhibit
Figure On/Off Inhibit Application Circuit Turning applies voltage Inhibit control disables output module. then turned off, module executes soft-start power-up sequence. regulated output voltage produced within 25ms. Figure shows typical rise both output voltage input current, following turnoff turnoff corresponds rise waveform, VDS. waveforms were measured with constant current load.
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V/div)
A/div)
V/div)
Time ms/div
Figure Inhibit Waveform Auto-TrackFunction Auto-Track function unique PTH/PTV family, available with POLA products. Auto-Track designed simplify amount circuitry required make output voltage from each module power power down sequence. sequencing more supply voltages during power common requirement complex mixed-signal applications that dual-voltage VLSI such TMS320DSP family, microprocessors, ASICs. Auto-TrackWorks Auto-Track works forcing module output voltage follow voltage presented Track control (1). This control range limited between module set-point voltage. Once track-pin voltage raised above set-point voltage, module output remains set-point (2). example, Track 2.5-V regulator regulated output voltage Track rises regulated output does higher than Under Auto-Track control, regulated output from module follows voltage Track volt-for-volt basis. connecting Track number these modules together, output voltages follow common signal during power power down. control signal externally generated master ramp waveform, output voltage from another power supply circuit (3). convenience, Track input incorporates internal RC-charge circuit. This operates module input voltage produce suitable rising waveform power
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SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
Typical Auto-TrackApplication basic implementation Auto-Track allows simultaneous voltage sequencing number Auto-Track compliant modules. Connecting Track inputs more modules forces their track input follow same collective RC-ramp waveform, allows their power-up sequence coordinated from common track control signal. This open-collector open drain) device, such power-up reset voltage supervisor Figure coordinate power-up sequence, Track control must first pulled ground potential. This should done before input power applied modules. ground signal should maintained least after input power been applied. This brief period gives modules time complete their internal soft-start initialization (4), enabling them produce output voltage. low-cost supply voltage supervisor that includes built-in time delay, ideal component automatically controlling track inputs power Figure shows TPS3808G50 supply voltage supervisor (U3) used coordinate sequenced power-up input Auto-Track modules. output TPS3808G50 supervisor becomes active above input voltage enabling assert ground signal common track control well before input voltage reached module's undervoltage lockout threshold. ground signal maintained until approximately after input voltage risen above U3's voltage threshold, which 4.65 27-ms time period controlled capacitor value 4700 provides sufficient time delay modules complete their internal soft-start initialization. output voltage each module remains zero until track control voltage allowed rise. When removes ground signal, track control voltage automatically rises. This causes output voltage each module rise simultaneously with other modules, until each reaches respective set-point voltage. Figure shows output voltage waveforms from circuit Figure after input voltage applied circuit. waveforms, represent output voltages from power modules, (3.3 (1.8 respectively. VTRK, VO1, shown rising together produce desired simultaneous power-up characteristic. same circuit also provides power-down sequence. When input voltage falls below U3's voltage threshold, ground signal reapplied common track control. This pulls track inputs zero volts, forcing output each module follow, shown Figure order simultaneous power-down occur, track inputs must pulled before input voltage fallen below modules' undervoltage lockout. This important constraint. Once modules recognize that valid input voltage longer present, their outputs longer follow voltage applied their track input. During power-down sequence, fall output voltage from modules limited maximum output capacitance Auto-Track slew rate. Track pulled slew rate greater than V/ms, discharge output capacitors will induce large currents which could exceed peak current rating module. This will result reduction maximum allowable output capacitance listed Electrical Characteristics table. When controlling Track PTV05010W using voltage supervisor slew rate increased, therefore COmax reduced 2200µF. Notes Auto-Track1. Auto-Track function tracks almost voltage ramp during power compatible with ramp speeds V/ms. Track voltage must allowed rise above module set-point voltage before module regulates adjusted set-point voltage. absolute maximum voltage that applied Track input voltage module cannot follow voltage track control input until completed soft-start initialization. This takes about from time that valid voltage been applied input. During this period, recommended that Track held ground potential. Auto-Track function disabled connecting Track input voltage (VI). When Auto-Track disabled, output voltage rises quicker more linear rate after input power been applied.
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Track
PTV05010W
Adjust
Inhibit
RSET
SENSE
RESET
TPS3808G50
RTRK
Track
Sense
4700
PTV05020W
RTRK Number Track pins connected together
Inhibit
Adjust
RSET 5.49
Figure Sequenced Power Power Down Using Auto-Track
VTRK V/div)
VTRK V/div)
V/div)
V/div)
V/div)
V/div)
Time ms/div
Figure Simultaneous Power With Auto-Track Control Submit Documentation Feedback Product Folder Link(s) :PTV05010W
Time µs/div
Figure Simultaneous Power Down With Auto-Track Control
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PTV05010W
SLTS242A FEBRUARY 2005 REVISED OCTOBER 2005
Prebias Start-Up Capability prebias start-up condition occurs result external voltage being present output power module prior output becoming active. This often occurs complex digital systems when current from another power source backfed through dual-supply logic component, such FPGA ASIC. Another path might clamp diodes, sometimes used part dual-supply power-up sequencing arrangement. prebias cause problems with power modules that incorporate synchronous rectifiers. This because under most operating conditions, such modules sink well source output current. PTH/PTV modules incorporate synchronous rectifiers sink current during start-up, whenever Inhibit held low. Start-up includes initial delay (approximately 8-15 ms), followed rise output voltage under control module internal soft-start mechanism; Figure Conditions Prebias Holdoff order module allow output prebias voltage exist (and sink current), certain conditions must maintained. module holds prebias voltage when Inhibit held low, whenever output allowed rise under soft-start control. Power under soft-start control occurs removal ground signal Inhibit (with input voltage applied), when input power applied with Auto-Track disabled(1). input voltage must also greater than applied prebias source(2). soft-start period complete when output begins rising above prebias voltage. module then functions normal, sinks current voltage higher than set-point value applied output. Note: prebias condition present, soft-start period complete when output voltage risen either set-point voltage, voltage applied module Track control pin, whichever lowest, output. Demonstration Circuit Figure shows start-up waveforms demonstration circuit shown Figure initial rise prebias voltage, which passed from VCCIO VCORE voltage rail through ASIC. Note that output current from module (IO2) negligible until output voltage rises above applied prebias.
V/div) V/div)
V/div)
V/div)
V/div)
A/div)
Start-up period
ms/div
Figure PTV05010W Start-Up
ms/div
Figure Prebias Start-Up Waveforms
NOTES: prebias start-up feature compatible with Auto-Track. rise output limited voltage applied Track control pin, output sinks current during period that track control voltage below that back-feeding source. this reason, Auto-Track should disabled when being used. This accomplished connecting Track input voltage, This raises Track well above set-point voltage prior start-up, thereby defeating Auto-Track feature. further ensure that regulator output does sink current when power first applied (even with ground signal applied Inhibit control input), input voltage must always greater than applied
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prebias source. This condition must exist throughout power-up sequence power system.
Track
Sense PTV05020W
Inhibit
Track
PTV05010W
Inhibit TPS3808G33
SENSE
VOAdj
5.49
VCORE
VCCIO
RESET
ASIC
0.1µF
Figure Application Circuit Demonstrating Prebias Start-Up
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PACKAGE OPTION ADDENDUM
9-Oct-2007
PACKAGING INFORMATION
Orderable Device PTV05010WAH
Status ACTIVE
Package Type
Package Drawing
Pins Package Plan Pb-Free (RoHS)
Lead/Ball Finish Call
Peak Temp Type
marketing status values defined follows: ACTIVE: Product device recommended designs. LIFEBUY: announced that device will discontinued, lifetime-buy period effect. NRND: recommended designs. Device production support existing customers, does recommend using this part design. PREVIEW: Device been announced production. Samples available. OBSOLETE: discontinued production device.
Plan planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), Green (RoHS Sb/Br) please check latest availability information additional product content details. TBD: Pb-Free/Green conversion plan been defined. Pb-Free (RoHS): TI's terms "Lead-Free" "Pb-Free" mean semiconductor products that compatible with current RoHS requirements substances, including requirement that lead exceed 0.1% weight homogeneous materials. Where designed soldered high temperatures, Pb-Free products suitable specified lead-free processes. Pb-Free (RoHS Exempt): This component RoHS exemption either lead-based flip-chip solder bumps used between package, lead-based adhesive used between leadframe. component otherwise considered Pb-Free (RoHS compatible) defined above. Green (RoHS Sb/Br): defines "Green" mean Pb-Free (RoHS compatible), free Bromine (Br) Antimony (Sb) based flame retardants exceed 0.1% weight homogeneous material)
MSL, Peak Temp. Moisture Sensitivity Level rating according JEDEC industry standard classifications, peak solder temperature. Important Information Disclaimer:The information provided this page represents TI's knowledge belief date that provided. bases knowledge belief information provided third parties, makes representation warranty accuracy such information. Efforts underway better integrate information from third parties. taken continues take reasonable steps provide representative accurate information have conducted destructive testing chemical analysis incoming materials chemicals. suppliers consider certain information proprietary, thus numbers other limited information available release. event shall TI's liability arising such information exceed total purchase price part(s) issue this document sold Customer annual basis.
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IMPORTANT NOTICE
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