PART NUMBER: VPOL15A-5-SMT DESCRIPTION: point load converter
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PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
features industry standard high efficiency switching frequency 3.0-5.5 input range 0.9-3.63 wide output range over temperature protection continuous short circuit protection remote on/off cost-efficient open frame design UL/C-UL60950 (E222736) certified
INTRODUCTION VPOL15A-5-SMT CONVERTER FEATURES GENERAL DESCRIPTION
Electrical Description Thermal Packaging Physical Design.
APPLICATIONS
Layout Design Challenges. Convection Requirements Cooling Thermal Considerations Power De-Rating Curves Efficiency Load Curves Input Capacitance Power Module Test Set-Up Remote Sense Compensation VPOL15A-5-SMT Series Output Voltage Adustment. 7.10 Output Ripple Noise Measurement 7.11 Output Capacitance 7.12 VPOL15A-5-SMT Reflow Profile
TECHNICAL SPECIFICATIONS MAIN FEATURES FUNCTIONS
Operating Temperature Range Over-Temperature Protection (OTP) Output Voltage Adjustment Safe Operating Area (SOA) Over Current Protection Remote on/off UVLO (Under-Voltage Lockout)
MECHANICAL OUTLINE DIAGRAMS
VPOL15A-5-SMT Mechanical Outline Diagrams VPOL15A-5-SMT Tape Reel Dimensions
SAFETY
Input Fusing Safety Considerations.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
Introduction
This application note describes features functions V-Infinity's VPOL15A-5-SMT series non-isolated dc-dc converters. These highly efficient, reliable compact, high power density, single output dc-dc converters. These "Point Load" modules serve needs specifically fixed mobile telecommunications computing market, employing economical distributed power architectures. VPOL15A-5-SMT series provide precisely regulated output voltage range from 0.9V 3.63Vdc over wide range input voltage (Vi=3.0 5.5Vdc) operate over ambient temperature range -40°C +85°C. Ultr a-high efficiency operation achieved through synchronous rectification drive control techniques. modules fully protected against short circuit overtemperature conditions. V-Infinity's world class automated manufacturing methods, together with extensive testing qualification program, ensure that VPOL15A-5-SMT series converters extremely reliable.
converter also protected against over-temperature conditions. converter overloaded ambient temperature gets high, converter will shut down protect unit.
+VIN
sense
+SENSE
ON/OFF
trim
TRIM
Figure Electrical Block Diagram
VPOL15A-5-SMT Converter Features
High efficiency topology, typically 3.3Vdc Industry standard footprint Wide ambient temperature range, -40°C +85°C Cost efficient open frame design Programmable output voltage external resistor from 3.63Vdc minimum load requirement (Stable loads) Remote on/off Remote sense compensation Fixed switching frequency Continuous short-circuit protection over current protection Over-temperature protection (OTP) Monotonic Startup with pre-bias output. UL/IEC/EN60950 Certified.
Thermal Packaging Physical Design.
VPOL15A-5-SMT series uses multi-layer construction. surface mount power components placed side PCB, low-power control components placed other side. Thus, heat dissipation power components optimized, ensuring that control components thermally stressed. converter open-frame product case case pin. open-frame design several advantages over encapsulated closed devices. Among these advantages are: Efficient Thermal Management: heat removed from heat generating components without heating more sensitive, small signal control components. Environmental: Lead free open-frame converters more easily re-cycled. Cost Efficient: encapsulation. Cost efficient open-frame construction. Reliable: Efficient cooling provided open frame construction offers high reliability easy diagnostics.
General Description
Electrical Description
block diagram VPOL15A-5-SMT Series converter shown Figure Extremely high efficiency power conversion achieved through synchronous rectification drive techniques. Essentially, powerful VPOL15A-5-SMT series topology based non-isolated synchronous buck converter. control loop optimized unconditional stability, fast transient response very tight line load regulation. typical pre-bias application VPOL15A-5-SMT series converters draw reverse current start-up. output voltage adjusted from 3.63vdc, using TRIM with external resistor. converter shut down remote on/off input that referenced ground. This input compatible with popular logic devices; 'positive' logic input supplied standard. Positive logic implies that converter enabled remote on/off input high floating), disabled low.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
Technical Specifications
(All specifications typical nominal input, full load 25°C unless otherwise noted.) PARAMETER ABSOLUTE MAXIMUM RATINGS
Input Voltage Continuous Operating Temp erature Thermal Considerations Section Storage Temperature
NOTES CONDITIONS
Device
Min.
Typical Max.
Units
+125
INPUT CHARACTERISTICS
Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current Vin=3.0 5.5Vdc Io=Io,max. Vo=1.0V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Shutdown input idle current Vo=2.7V Vo=3.0V
15.5
No-Load Input Current
Converter Input Current Inrush Current Input Reflected-Ripple Current
thru inductor, 20MHz
OUTPUT CHARACTERISTIC
Output Voltage Point Output Voltage Trim Adjustment Range Output Voltage Regulation Load Regulation Line Regulation Tempera ture Coefficient Output Voltage Ripple Noise Peak-to-Peak External Capacitive Load Operating Output Current Range Output Current-Limit Inception Shout Circuit Protection Output Voltage =90% Nominal Output Voltage Continuous with Hiccup Mode Io=Io.min Io.max Vin=low line high line Ta=-40°C 85°C 20MHz bandwidth Full Load, ceramic 10uF tantalum Full Load, ceramic 10uF tantalum 10000 VPOL15A-5SMT -0.5 -0.2 -0.4 +0.5 +0.2 +0.4 ±0.03 %/°C Vin=Nominal Io=Io.max, Tc=25°C Selected external resistor -1.5% Vo,set +1.5% 3.63
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
PARAMETER DYNAMIC CHARACTERISTICS
Output Voltage Transient Response Error Brand Setting Time (within Vout nominal)
NOTES CONDITIONS
Device
Min.
Typical Max.
Units
Step Load Change, di/dt=0.1A/us Step Load Change, di/dt=0.1A/us
EFFICIENCY
Vo=1.0V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Non-isolation
100% Load
ISOLATION CHARACTERISTICS
Input Output
FEATURE CHARACTERISTICS
Switching Frequency on/off Control, Positive Logic Remote On/Off Logic (Module Off) Logic High (Module on/off Control, Negative Logic Remote On/Off Logic (Module Logic High (Module Off) on/off Current (for both remote on/off logic) Leakage Current (for both remote on/off logic) Turn-On Delay Rise Time Turn-On Delay Time, From On/Off Control Turn-On Delay Time, From Input Output Voltage Rise Time Over Temperature Protection Open Circuit Open Circuit Ion/off Von/off=0.0V Logic High, Von/off=5V Von/off 10%Vo,set Vin,min. 10%Vo,set 10%Vo,set 90%Vo,set hours grams
GENERAL SPECIFICATIONS
MTBF Weight Io=100%of Io.max;Ta=25 MIL-HDBK-217F
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
current protection. unit operates normally once fault condition
Main Features Functions
Operating Temperature Range
V-Infinity's VPOL15A-5-SMT series converters highly efficient converter design resulted ability operate over wide ambient temperature environment -40° 85°C). consideration must given de-rating curves when ascertaining maximum power that drawn from converter. maximum power drawn influenced number factors, such Input voltage range. Output load current. velocity (forced natural convection). Mounting orientation converter with respect airflow. Motherboard design, especially ground power planes. These effective heat sinks converter.
removed. power module will supply 150% rated current. event over current converter will into hiccup mode protection.
Remote On/Off
remote on/off input feature converter allows external circuitry turn converter off. Active-high remote on/off available standard. VPOL15A-5-SMT series converters turned remote on/off high, left open floating. Setting will turn converter `Off'. signal level remote on/off input defined with respect ground. using remote on/off pin, leave open (module will on). part number suffix negative remote on/off version. unit guaranteed over full temperature range this voltage level exceeds 2.8Vdc. converters turned on/off input left open. recommended VPOL15A-5SMT remote on/off drive circuit shown figures
Over-Temperature Protection (OTP)
VPOL15A-5-SMT series converters equipped with non-latching over-temperature protection. mperature sensor monitors temperature spot (typically, switch). temperature exceeds threshold 120°C (typical) converter will shut down, disabling output. When temperature decreased converter will automatically restart. over-temperature condition induced variety reasons such external overload condition system failure.
Output Voltage Adjustment
Section describes detail trim output voltage with respect point. output voltage models trimmable range 3.63Vdc.
Safe Operating Area (SOA)
Figure provides graphical representation safe operating area (SOA) converter. This representation assumes ambient operating conditions such airflow thermal guidelines provided Sections 7.3.
Vo,nom VOLTAGE
Safe Operating Area
Io,max Io,CL CURRENT
Figure Maximum Output Current Safe Operating Area
Over Current Protection
different voltage models have full continuous short-circuit protection. unit will auto recover once short circuit removed. provide protection fault condition, unit equipped with internal over-
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
+Vin Remote ON/OFF
Applications
Layout Design Challenges.
optimizing thermal design utilized heat sink. Also some heat transferred from VPOL15A-5-SMT module main board through connecting pins. system designer user must ensure that other components metal vicinity VPOL15A-5-SMT series meet spacing requirements which system approved. resistance inductance layout traces norm should used where possible. consideration must also given proper impedance tracks between power module, input output grounds. recommended VPOL15A-5-SMT footprint shown figure
ON/OFF Control
VPOL15A-5-SMT
Common Common
Figure Positive Remote on/off Input Drive Circuit
+Vin
VPOL15A-5-SMT
ON/OFF Control Remote ON/OFF Common Common
Recommended Layout
Dimensions millimetes and(inches)
Figure Negative Remote on/off Input Drive Circuit
7.54 (0.297)
4.83
4.83
4.83
7.87 (0.310)
UVLO (Under-Voltage Lockout)
voltage determines start operation Converter. When input rises exceeds about 2.8V converter initiates soft start. UVLO function converter hysteresis (about 100mV) built provide noise immunity start-up.
10.29 (0.405)
(0.190) (0.190) (0.190)
+SENSE TRIM
10.92 (0.430) +VIN
View Board
ON/OFF
Safety
Input Fusing Safety Considerations.
Agency Approvals: power supply shall submitted receive formal approval from following test agencies. 1.The power supply shall approved nationally recognized testing laboratory UL/CSA 60950 Edition (North America) EN60950 (International) Certificate from internationally recognized test house accordance with 60950. VPOL15A-5-SMT series converters have internal fuse. However, achieve maximum safety system protection, always input line fuse. safety agencies require time-delay fuse with maximum rating 20A.
0.64 (0.025)
29.90 (1.177) SIZE MIN:3.556x2.413(0.140x0.095) MAX:4.19x2.79(0.165x0.110)
Figure Recommended VPOL15A-5-SMT Footprint
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
TYPICAL POWER DERATING Vout SMT15-05S33A Derating Curve
Output Current(A) Ambient Temperature( 0LFM 100LFM 200LFM
NOTE:
specific input output derating curves available, please contact V-Infinity detail
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
Efficiency Load Curves (Fig.
VPOL15A-5-SMT Vo=3.3V (Eff
100%
100%
VPOL15A-5-SMT Vo=2.5V (Eff
Efficincy
Efficincy
4.5V 5.0V 5.5V
3.0V 5.0V 5.5V
Current Load
VPOL15A-5-SMT Vo=1.8V (Eff
100%
Current Load
VPOL15A-5-SMT Vo=1.5V (Eff
100%
Efficincy
Efficincy
3.0V 5.0V 5.5V
3.0V 5.0V 5.5V
Current Load
Current Load
VPOL15A-5-SMT Vo=1.2V (Eff
100% 100%
VPOL15A-5-SMT Vo=1.0V (Eff
Efficincy
Efficincy
3.0V 5.0V 5.5V
3.0V 5.0V 5.5V
Current Load
Current Load
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
output voltage load
Input Capacitance Power Module
VPOL15A-5-SMT converters must connected source impedance. avoid probl with loop stability source inductance should low. Also, input capacitors should placed close converter input pins de-couple distribution inductance. However, external input capacitors chosen suitable ripple handling capability. polymers good choice. They have high capacitance, high ripple rating (typical <20mohm). Electrolytic capacitors should avoided. Circuit shown Figure represents typical measurement methods ripple current. Input reflected-ripple current measured with simulated source Inductance 1uH. Current measured input module.
Supply Power Voltage 100uF Meter Tant.
value line regulation defined
Line.reg
100%
Current Meter +Vin +Sense Voltage Meter R-Load
Where: output voltage maximum input voltage full load. output voltage minimum input voltage full load.
Current Meter
VPOL15A-5-SMT
Oscilloscope Power Supply 2*100uF Tantalum 220uF ESR<0.1ohm Common Figure Input Reflected-Ripple Test Setup +Vin
Common
Common
Figure VPOL15A-5-SMT Series Test Setup
Remote Sense Compensation
Remote sense regulates output voltage point load. minimizes effects distribution losses such drops across connecting tracks (see Figure 13). Please note however, maximum drop from output point load should exceed 500mV remote compensation work. amount power delivered module defined output voltage multiplied output current IO). When using "Trim Up", output voltage module will increase which, same output current maintained, increases power output module. Make sure that maximum output power module remains below maximum rated power. When remote sense feature being used, leave sense disconnected.
VPOL15A-5-SMT
Test Set-Up
basic test set-up measure parameters such efficiency load regulation shown Figure Things note that this converter non-isolated, such input output share common ground. These grounds should connected together impedance ground plane application circuit. When testing converter bench set-up, ensure that -Vin connected together impedance short ensure proper efficiency load regulation measurements being made. When testing V-Infinity's VPOL15A-5-SMT series under transient conditions please ensure that transient response source sufficient power equipment under test. calculate Efficiency Load regulation line regulation. value efficiency defined
Figure Circuit Configuration Remote Sense Operation
Distribution Losses +Vin +Sense
VPOL15A-5-SMT
R-Load
Where:
100%
output voltage, output current, input voltage, input current.
Common
Common
Distribution Losses
value load regulation defined
Load .reg
Where:
100%
output voltage full load
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
VPOL15A-5-SMT Series Output Voltage Adustment.
output voltage VPOL15A-5-SMT adjusted range 0.9V 3.63V connecting single resistor motherboard (shown Rtrim) Figure When trim resistor connected output voltage defaults 0.75V
7.10 Output Ripple Noise Measurement
test set-up noise ripple measurements shown Figure coaxial cable with 50ohm termination used prevent impedance mismatch reflections disturbing noise readings higher frequencies.
+Vin
Trim
+Vin
VPOL15A-5-SMT
R-Load trim-up
VPOL15A-5-SMT
10uF Tant.
Ceramic
R-Load Test Jack
Common
Common
Common
Common
Figure Output Voltage Ripple Noise Measurement Set-Up
Figure Trim-up Voltage Setup
value Rtrim-up defined
7.11 Output Capacitance
V-Infinity's VPOL15A-5-SMT series converters provide unconditional stability with without external capacitors. good transient response output capacitors should located close point load. high current applications point already been made layout considerations resistance inductance tracks. Output capacitors with associated values have impact loop stability bandwidth. V-Infinity's converters designed work with load capacitance up-to 10,000uF. ommended that additional capacitance, typically 1,000uF (<20mohm), connected close point load outside remote compensation point.
Rtrim
Where:
21070 5110 0.75
Rtrim-up external resistor ohm, desired output voltage
give mple above calculation, voltage 3.3Vdc, Rtrim given
21070 Rtrim 5110 0.75
Rtrim 3153 various output values various resistors calculated provided Table nvenience.
7.12 VPOL15A-5-SMT Reflow Profile
example VPOL15A-5-SMT reflow profile given Figure Equipment used: REFLOW HD-350SAR Alloy: AMQ-M293TA C-SMQ92 IND-82088 SN63
REFLOW PROFILE
Vo,set 0.90 1.00 1.20 1.50 1.80 2.00 2.50 3.30 3.63
Rtrim (Kohm) 135.36 79.17 41.71 22.98 14.96 11.75 6.93 3.15 2.20
TEMPERATURE
TIME (SECONDS)
Table Trim Resistor Values
Figure VPOL15A-5-SMT Reflow Profile
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
rev. page date
PART NUMBER: VPOL15A-5-SMT
DESCRIPTION: point load converter
Mechanical Outline Diagrams
VPOL15A-5-SMT Mechanical Outline Diagrams
Dimensions millimeters inches Tolerance: x.xx ±0.02 (0.5mm) x.xxx ±0.010 (0.25 unless otherwise noted
VPOL15A-5-SMT Tape Reel Dimensions
tape reel dimensions VPOL15A-5-SMT module shown Figure
BOTTOM VIEW BOARD
33.0 (1.30) 7.87 (0.310) 4.83 4.83 4.83 7.54 (0.297) 1.65 (0.065) 9.30 (0.366) max.
(0.190) (0.190) (0.190)
TRIM +SENSE 10.29 13.46 (0.405) (0.530)
1.60 (0.063)
+VIN
ON/OFF
SURFACE MOUNT CONTACT
1.91 (0.075) 1.22 (0.048) INDUCTOR
2.84 (0.112) Dimensions millimeters(Inches)
lerances :X.X ±0.5mm(0.02in),X.XX ±0.25mm(0.010in),unless otherwise noted.
Figure VPOL15A-5-SMT Mechanical Outline Diagram
Figure VPOL15A-5-SMT Tape Reel Dimensions
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
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