rev. PART NUMBER: VPOL15A-5-SMT page 1 of 11 date 08/2007 DESCRIPTION: point of load converter features * industry standard pin out * high efficiency to 94% * 300 KHz switching frequency * 3.0-5.5 VDC input range * 0.9-3.63 VDC wide output range * over temperature protection * continuous short circuit protection * remote on/off * cost-efficient open frame design * UL/C-UL60950 (E222736) certified 1. INTRODUCTION 2. VPOL15A-5-SMT CONVERTER FEATURES 3. GENERAL DESCRIPTION 7. APPLICATIONS 3.1 Electrical Description 7.3 Thermal Considerations 3.2 Thermal Packaging and Physical Design. 7.4 Power De-Rating Curves 4. TECHNICAL SPECIFICATIONS 5. MAIN FEATURES AND FUNCTIONS 7.5 Efficiency vs Load Curves 7.6 Input Capacitance at the Power Module 5.1 Operating Temperature Range 7.7 Test Set-Up 5.2 Over-Temperature Protection (OTP) 7.8 Remote Sense Compensation 5.3 Output Voltage Adjustment 7.9 VPOL15A-5-SMT Series Output Voltage Adustment. 5.4 Safe Operating Area (SOA) 7.10 Output Ripple and Noise Measurement 5.5 Over Current Protection 7.11 Output Capacitance 5.6 Remote on/off 7.12 VPOL15A-5-SMT Reflow Profile 5.7 UVLO (Under-Voltage Lockout) 8. MECHANICAL OUTLINE DIAGRAMS 6. SAFETY 8.1 VPOL15A-5-SMT Mechanical Outline Diagrams 6.1 Input Fusing and Safety Considerations. 8.2 VPOL15A-5-SMT Tape and Reel Dimensions 7.1 Layout Design Challenges. 7.2 Convection Requirements for Cooling 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. PART NUMBER: VPOL15A-5-SMT page 2 of 11 date 08/2007 DESCRIPTION: point of load converter 1. Introduction The converter is also protected against over-temperature conditions. If This application note describes the features and functions of V-Infinity’s the converter will shut down to protect the unit. the converter is overloaded or the ambient temperature gets too high, VPOL15A-5-SMT series of non-isolated dc-dc converters. These are highly efficient, reliable and compact, high power density, single output L1 Q1 +VIN +VO dc-dc converters. These “Point of Load” modules serve the needs specifically of the fixed and mobile telecommunications and computing Q2 C1 market, employing economical distributed power architectures. The D1 C2 R sense VPOL15A-5-SMT series provide precisely regulated output voltage +SENSE range from 0.9V to 3.63Vdc over a wide range of input voltage (Vi=3.0 – 5.5Vdc) and can operate over an ambient temperature range of –40°C COM COM to +85°C. Ultra-high efficiency operation is achieved through the use of R1 synchronous rectification and drive control techniques. The modules are fully protected against short circuit and over- PWM IC ON/OFF R trim TRIM ERR AMP temperature conditions. V-Infinity’s world class automated R2 manufacturing methods, together with an extensive testing and qualification program, ensure that all VPOL15A-5-SMT series Figure 1. Electrical Block Diagram converters are extremely reliable. 2. VPOL15A-5-SMT Converter Features 3.2 Thermal Packaging and Physical Design. The VPOL15A-5-SMT series uses a multi-layer FR4 PCB construction. All surface mount power components are placed on one side of the PCB, and all low-power control components are placed on the other High efficiency topology, typically 94% at 3.3Vdc side. Thus, the heat dissipation of the power components is optimized, Industry standard footprint ensuring that control components are not thermally stressed. The Wide ambient temperature range, -40°C to +85°C converter is an open-frame product and has no case or case pin. The Cost efficient open frame design open-frame design has several advantages over encapsulated closed Programmable output voltage via external resistor from 0.9 to devices. Among these advantages are: 3.63Vdc No minimum load requirement (Stable at all loads) Efficient Thermal Management: the heat is removed from the Remote on/off heat generating components without heating more sensitive, small Remote sense compensation signal control components. Fixed switching frequency Environmental: Lead free open-frame converters are more easily Continuous short-circuit protection and over current protection re-cycled. Over-temperature protection (OTP) Cost Efficient: No encapsulation. Cost efficient open-frame Monotonic Startup with pre-bias at the output. construction. UL/IEC/EN60950 Certified. Reliable: Efficient cooling provided by open frame construction offers high reliability and easy diagnostics. 3. General Description 3.1 Electrical Description A block diagram of the VPOL15A-5-SMT Series converter is shown in Figure 1. Extremely high efficiency power conversion is achieved through the use of synchronous rectification and drive techniques. Essentially, the powerful VPOL15A-5-SMT series topology is based on a non-isolated synchronous buck converter. The control loop is optimized for unconditional stability, fast transient response and a very tight line and load regulation. In a typical pre-bias application the VPOL15A-5-SMT series converters do not draw any reverse current at start-up. The output voltage can be adjusted from 0.9 to 3.63vdc, using the TRIM pin with a external resistor. The converter can be shut down via a remote on/off input that is referenced to ground. This input is compatible with popular logic devices; a 'positive' logic input is supplied as standard. Positive logic implies that the converter is enabled if the remote on/off input is high (or floating), and disabled if it is low. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 3 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT 4. Technical Specifications (All specifications are typical at nominal input, full load at 25°C unless otherwise noted.) PARAMETER ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous Operating Temp erature See Thermal Considerations Section NOTES and CONDITIONS Device Min. Typical Max. Units ALL 0 5.8 Vdc ALL -40 +85 °C ALL -55 +125 °C ALL 3.0 4.5 5.5 5.5 Vdc Storage Temperature INPUT CHARACTERISTICS Operating Input Voltage Vo=2.7V Vo=3.0V Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current Vin=3.0 to 5.5Vdc , Io=Io,max. No-Load Input Current Vo=1.0V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Off Converter Input Current Shutdown input idle current ALL ALL ALL ALL 5.0 5.0 Vdc Vdc Vdc 2.8 2.7 0.1 15.5 60 60 60 70 70 70 70 ALL ALL 5 A mA 10 mA 0.4 As Inrush Current (I t) ALL Input Reflected-Ripple Current P-P thru 1uH inductor, 5Hz to 20MHz ALL 150 mA Output Voltage Set Point Vin=Nominal Vin , Io=Io.max, Tc=25°C ALL -1.5% Vo,set +1.5% Vdc Output Voltage Trim Adjustment Range Selected by an external resistor ALL 0.9 3.63 Vdc Load Regulation Io=Io.min to Io.max ALL -0.5 +0.5 % Line Regulation Vin=low line to high line -0.2 -0.4 +0.2 +0.4 % ±0.03 %/°C 2 2 OUTPUT CHARACTERISTIC Output Voltage Regulation Tempera ture Coefficient Ta=-40°C to 85°C Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth VPOL15A-5SMT ALL Peak-to-Peak Full Load, 1uF ceramic and 10uF tantalum ALL 50 mV RMS Full Load, 1uF ceramic and 10uF tantalum ALL 20 mV Low ESR ALL 10000 uF ALL 0 Output DC Current-Limit Inception Output Voltage =90% Nominal Output Voltage ALL 18 Shout Circuit Protection Continuous with Hiccup Mode External Capacitive Load Operating Output Current Range 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 22 15 A 28 A rev. 4 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT PARAMETER DYNAMIC CHARACTERISTICS page NOTES and CONDITIONS Device Min. Typical Max. Units Output Voltage Transient Response Error Brand 25% Step Load Change, di/dt=0.1A/us ALL Setting Time (within 1% Vout nominal) 25% Step Load Change, di/dt=0.1A/us ALL ±5 % 200 us EFFICIENCY 100% Load Vo=1.0V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V 82 84 87 88 89 92 94 ALL % ISOLATION CHARACTERISTICS Input to Output Non-isolation 0 Vdc FEATURE CHARACTERISTICS Switching Frequency on/off Control, Positive Logic Remote On/Off Logic Low (Module Off) Logic High (Module On) on/off Control, Negative Logic Remote On/Off Logic Low (Module On) Logic High (Module Off) on/off Current (for both remote on/off logic) Leakage Current (for both remote on/off logic) Turn-On Delay and Rise Time Turn-On Delay Time, From On/Off Control Turn-On Delay Time, From Input Output Voltage Rise Time Over Temperature Protection 300 ALL 0 0.4 Vin Vdc Vdc ALL 0 2.8 0.4 Vin Vdc Vdc 1 1 mA mA or Open Circuit or Open Circuit KHz Ion/off at Von/off=0.0V Logic High, Von/off=5V Von/off to 10%Vo,set Vin,min. to 10%Vo,set 10%Vo,set to 90%Vo,set 1 1 3.5 120 Io=100%of Io.max;Ta=25 °C per MIL-HDBK-217F 1.5 6.8 6 ms ms ms °C GENERAL SPECIFICATIONS MTBF Weight 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 M hours grams rev. page 5 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT current protection. The unit operates normally once the fault condition is 5. Main Features and Functions removed. The power module will supply up to 150% of rated current. In the event of an over current converter will go into a hiccup mode 5.1 Operating Temperature Range protection. V-Infinity’s VPOL15A-5-SMT series converters highly efficient converter 5.6 Remote On/Off design has resulted in its ability to operate over a wide ambient The remote on/off input feature of the converter allows external circuitry temperature environment ( -40°C to 85°C). Due consideration must be to turn the converter on or off. Active-high remote on/off is available as given to the de-rating curves when ascertaining maximum power that can standard. The VPOL15A-5-SMT series converters are turned on if the be drawn from the converter. The maximum power drawn is influenced remote on/off pin is high, or left open or floating. Setting the pin low will by a number of factors, such as: turn the converter ‘Off’. The signal level of the remote on/off input is defined with respect to ground. If not using the remote on/off pin, leave Input voltage range. the pin open (module will be on). The part number suffix “N” is negative Output load current. Air velocity (forced or natural convection). Mounting orientation of converter PCB with respect to the airflow. Motherboard PCB design, especially ground and power planes. These can be effective heat sinks for the converter. remote on/off version. The unit is guaranteed off over the full temperature range if this voltage level exceeds 2.8Vdc. The converters are turned on If the on/off pin input is low or left open. The recommended VPOL15A-5SMT remote on/off drive circuit is shown as figures 3 & 4. 5.2 Over-Temperature Protection (OTP) The VPOL15A-5-SMT series converters are equipped with non-latching over-temperature protection. A te mperature sensor monitors the temperature of the hot spot (typically, top switch). If the temperature exceeds a threshold of 120°C (typical) the converter will shut down, disabling the output. When the temperature has decreased the converter will automatically restart. The over-temperature condition can be induced by a variety of reasons such as external overload condition or a system fan failure. 5.3 Output Voltage Adjustment Section 7.9 describes in detail as to how to trim the output voltage with respect to its set point. The output voltage on all models is trimmable in the range 0.9 – 3.63Vdc. 5.4 Safe Operating Area (SOA) Figure 2 provides a graphical representation of the safe operating area (SOA) of the converter. This representation assumes ambient operating conditions such as airflow are met as per thermal guidelines provided in Sections 7.2 and 7.3. Vo VOLTAGE (V) Vo,nom Safe Operating Area Io,max Io,CL Io CURRENT (A) Figure 2. Maximum Output Current Safe Operating Area 5.5 Over Current Protection All different voltage models have a full continuous short-circuit protection. The unit will auto recover once the short circuit is removed. To provide protection in a fault condition, the unit is equipped with internal over- 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. +Vin +Vo date 08/2007 7. Applications 7.1 Layout Design Challenges. Remote ON/OFF In optimizing thermal design the PCB is utilized as a heat sink. Also Q1 VPOL15A-5-SMT Common 6 of 11 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT ON/OFF Control page Common some heat is transferred from the VPOL15A-5-SMT module to the main board through connecting pins. The system designer or the end user must ensure that other components and metal in the vicinity of the VPOL15A-5-SMT series meet the spacing requirements to which the system is approved. Figure 3. Positive Remote on/off Input Drive Circuit Low resistance and low inductance PCB layout traces are the norm and should be used where possible. Due consideration must also be given to +Vin +Vo proper low impedance tracks between power module, input and output grounds. The recommended VPOL15A-5-SMT footprint is shown as Q1 VPOL15A-5-SMT ON/OFF Control figure 5. Remote ON/OFF Common Common Recommended Pad Layout Dimensions are in millimetes and(inches) Figure 4. Negative Remote on/off Input Drive Circuit 7.54 (0.297) 5.7 UVLO (Under-Voltage Lockout) 4.83 4.83 4.83 (0.190) (0.190) (0.190) 7.87 (0.310) The voltage on the Vcc pin determines the start of the operation of the +SENSE TRIM Converter. When the input Vcc rises and exceeds about 2.8V the converter initiates a soft start. The UVLO function in the converter has a 10.29 (0.405) +VO COM ON/OFF 0.64 (0.025) 6. Safety 6.1 Input Fusing and Safety Considerations. Agency Approvals: The power supply shall be submitted to and receive formal approval from the following test agencies. 10.92 (0.430) Top View of Board hysteresis (about 100mV) built in to provide noise immunity at start-up. +VIN 29.90 (1.177) PAD SIZE MIN:3.556x2.413(0.140x0.095) MAX:4.19x2.79(0.165x0.110) Figure 5. Recommended VPOL15A-5-SMT Footprint 1.The power supply shall be approved by a nationally recognized testing rd laboratory to UL/CSA 60950 3 Edition (North America) and EN60950 (International) 2. CB Certificate from an internationally recognized test house in accordance with EN 60950. The VPOL15A-5-SMT series converters do not have an internal fuse. However, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a time-delay fuse with a maximum rating of 20A. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. TYPICAL POWER DERATING FOR 5 Vin 3.3 Vout SMT15-05S33A Derating Curve 16 14 Output Current(A) 12 10 0LFM 6 100LFM 4 200LFM 2 0 0 10 20 30 40 50 60 70 Ambient Temperature( oC) 7 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT 8 page 80 90 100 NOTE: 1. specific input & output derating curves available, please contact V-Infinity for detail 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 8 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT 7.5 Efficiency vs Load Curves (Fig. 10) VPOL15A-5-SMT Vo=3.3V (Eff Vs Io) VPOL15A-5-SMT Vo=2.5V (Eff Vs Io) 95% 95% 90% 85% 4.5V 5.0V 5.5V 80% 75% Efficincy (%) 100% Efficincy (%) 100% 90% 85% 3.0V 5.0V 5.5V 80% 75% 70% 70% 0 1 2 3 4 5 6 7 8 0 9 10 11 12 13 14 15 1 2 3 4 95% 90% 85% 3.0V 5.0V 5.5V Efficincy (%) 95% Efficincy (%) 100% 75% 7 8 9 10 11 12 13 14 15 90% 85% 3.0V 5.0V 5.5V 80% 75% 70% 70% 0 1 2 3 4 5 6 7 8 0 9 10 11 12 13 14 15 1 2 3 4 VPOL15A-5-SMT Vo=1.2V (Eff Vs Io) 95% 95% 90% 90% 85% 80% 3.0V 5.0V 5.5V 65% 60% Efficincy (%) 100% 70% 6 7 8 9 10 11 12 13 14 15 VPOL15A-5-SMT Vo=1.0V (Eff Vs Io) 100% 75% 5 Current Load (A) Current Load (A) Efficincy (%) 6 VPOL15A-5-SMT Vo=1.5V (Eff Vs Io) VPOL15A-5-SMT Vo=1.8V (Eff Vs Io) 100% 80% 5 Current Load (A) Current Load (A) 85% 80% 75% 3.0V 5.0V 5.5V 70% 65% 60% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Current Load (A) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Current Load (A) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 9 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT VNL is the output voltage at no load 7.6 Input Capacitance at the Power Module The VPOL15A-5-SMT converters must be connected to a low AC The value of line regulation is defined as: source impedance. To avoid probl ems with loop stability source inductance should be low. Also, the input capacitors should be placed Line.reg = close to the converter input pins to de-couple distribution inductance. However, the external input capacitors are chosen for suitable ripple Where: VHL is the output voltage of maximum input voltage at full load. handling capability. Low ESR polymers are a good choice. They have VLL is the output voltage of minimum input voltage at full load. high capacitance, high ripple rating and low ESR (typical <20mohm). Current Meter Electrolytic capacitors should be avoided. Circuit as shown in Figure 11 A A +Vo +Sense Power + of 1uH. Current is measured at the input of the module. Supply + Voltage V 100uF Meter Tant. VPOL15A-5-SMT Common To Oscilloscope Voltage Meter V R-Load Common Figure 12. VPOL15A-5-SMT Series Test Setup L1 +Vin 1uH Power Current Meter +Vin represents typical measurement methods for ripple current. Input reflected-ripple current is measured with a simulated source Inductance VHL _ VLL x 100% VLL 7.8 Remote Sense Compensation Remote sense regulates the output voltage at the point of load. It + 2*100uF Tantalum Supply VPOL15A-5-SMT 220uF ESR<0.1ohm minimizes the effects of distribution losses such as drops across the connecting pin and PCB tracks (see Figure 13). Please note however, the maximum drop from the output pin to the point of load should not exceed 500mV for remote compensation to work. Common The amount of power delivered by the module is defined as the output voltage multiplied by the output current (VO x IO). When using “Trim Up”, the output voltage of the module will increase Figure 11. Input Reflected-Ripple Test Setup which, if the same output current is maintained, increases the power 7.7 Test Set-Up output by the module. Make sure that the maximum output power of the The basic test set-up to measure parameters such as efficiency and module remains at or below the maximum rated power. load regulation is shown in Figure 12. Things to note are that this When the remote sense feature is not being used, leave sense pin converter is non-isolated, as such the input and output share a common disconnected. ground. These grounds should be connected together via low impedance ground plane in the application circuit. When testing a Figure 13. Circuit Configuration for Remote Sense Operation converter on a bench set-up, ensure that -Vin and -Vo are connected together via a low impedance short to ensure proper efficiency and load regulation measurements are being made. When testing the V-Infinity’s VPOL15A-5-SMT series under any transient conditions please ensure Distribution Losses that the transient response of the source is sufficient to power the equipment under test. We can calculate the +Vin Efficiency +Sense Load regulation and line regulation. The value of efficiency is defined as: ç= Where: Vo x Io x 100% Vin x Iin +Vo R-Load VPOL15A-5-SMT Common Common Distribution Losses Vo is output voltage, Io is output current, Vin is input voltage, Iin is input current. The value of load regulation is defined as: Load .reg = Where: VFL _ VNL x 100% VNL VFL is the output voltage at full load 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 10 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT 7.9 VPOL15A-5-SMT Series Output Voltage Adustment. 7.10 Output Ripple and Noise Measurement The test set-up for noise and ripple measurements is shown in Figure The output voltage of the VPOL15A-5-SMT can be adjusted in the 15. a coaxial cable with a 50ohm termination was used to prevent range 0.9V to 3.63V by connecting a single resistor on the motherboard impedance mismatch reflections disturbing the noise readings at higher (shown as Rtrim) in Figure 14. When trim resistor is not connected the frequencies. output voltage defaults to 0.75V +Vin +Vo +Vin Trim 1uF Ceramic R-Load Test Jack R trim-up Common 10uF Tant. VPOL15A-5-SMT R-Load VPOL15A-5-SMT +Vo Common Common Common Figure 15. Output Voltage Ripple and Noise Measurement Set-Up Figure 14. Trim-up Voltage Setup 7.11 Output Capacitance V-Infinity’s VPOL15A-5-SMT series converters provide unconditional The value of Rtrim-up defined as: stability with or without external capacitors. For good transient response Rtrim = ( Where: 21070 _ 5110 ) Vo _ 0.75 low ESR output capacitors should be located close to the point of load. For high current applications point has already been made in layout considerations for low resistance and low inductance tracks. Rtrim-up is the external resistor in ohm, Output capacitors with its associated ESR values have an impact on Vo is the desired output voltage loop stability and bandwidth. V-Infinity’s converters are designed to To give an exa mple of the above calculation, to set a voltage of 3.3Vdc, work with load capacitance up-to 10,000uF. It is rec ommended that any Rtrim is given by: additional capacitance, typically 1,000uF and low ESR (<20mohm), be connected close to the point of load and outside the remote 21070 _ Rtrim = ( _ 5110 ) Vo 0.75 compensation point. 7.12 VPOL15A-5-SMT Reflow Profile An example of the VPOL15A-5-SMT reflow profile is given in Figure 16. Equipment used: SMD HOT AIR REFLOW HD-350SAR Rtrim = 3153 ohm Alloy: AMQ-M293TA or N C-SMQ92 IND-82088 SN63 For various output values various resistors are calculated and provided REFLOW PROFILE in Table 3 for co nvenience. Rtrim (Kohm) 135.36 79.17 41.71 22.98 14.96 11.75 6.93 3.15 2.20 Table 3 – Trim Resistor Values 200 TEMPERATURE (C) Vo,set (V) 0.90 1.00 1.20 1.50 1.80 2.00 2.50 3.30 3.63 240 160 120 80 40 0 0 30 60 90 120 150 180 210 240 TIME (SECONDS) Figure 16 VPOL15A-5-SMT Reflow Profile 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 11 of 11 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL15A-5-SMT 8. Mechanical Outline Diagrams 8.2 VPOL15A-5-SMT Tape and Reel Dimensions The tape reel dimensions for the VPOL15A-5-SMT module are shown 8.1 VPOL15A-5-SMT Mechanical Outline Diagrams in Figure 18. Dimensions are in millimeters and inches Tolerance: x.xx ±0.02 in. (0.5mm) , x.xxx ±0.010 in. (0.25 mm) unless otherwise noted P D t E BOTTOM VIEW OF BOARD 9.30 (0.366) max. 33.0 (1.30) 7.87 (0.310) 4.83 4.83 4.83 (0.190) (0.190) (0.190) COM +VO W Bo F Po P2 7.54 1.65 (0.065) (0.297) Ao Ko TRIM +SENSE 10.29 13.46 (0.405) (0.530) 1.60 (0.063) ON/OFF +VIN SURFACE MOUNT CONTACT 2.84 (0.112) 1.91 (0.075) 1.22 (0.048) Dimensions are in millimeters(Inches) L1 INDUCTOR W Ao To lerances :X.X ±0.5mm(0.02in),X.XX ±0.25mm(0.010in),unless otherwise noted. Bo Figure 17 VPOL15A-5-SMT Mechanical Outline Diagram Ko P F E D D1 Po P2 t Figure 18 – VPOL15A-5-SMT Tape a nd Reel Dimensions 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382