For more information, please visit the product page. rev. PART NUMBER: VPOL16A-12-SMT page 1 of 12 date 08/2007 DESCRIPTION: point of load converter features * industry standard pin out * high efficiency to 94% * 300 KHz switching frequency * 9.0-14 VDC wide input range * 0.75-5.0 VDC wide output range * over temperature protection * continuous short circuit protection * remote on/off * cost-efficient open frame design * UL/C-UL60950-1 (E222736) certified 1. INTRODUCTION 2. VPOL16A-12-SMT CONVERTER FEATURES 7. APPLICATIONS 7.1 Layout Design Challenges. 3. GENERAL DESCRIPTION 3.1 Electrical Description 7.2 Convection Requirements for Cooling 3.2 Thermal Packaging and Physical Design. 7.4 Power De-Rating Curves 4. TECHNICAL SPECIFICATIONS 7.5 Efficiency vs Load Curves 5. MAIN FEATURES AND FUNCTIONS 5.1 Operating Temperature Range 7.6 Input Capacitance at the Power Module 5.2 Over-Temperature Protection (OTP) 7.8 Remote Sense Compensation 5.3 Output Voltage Adjustment 7.8 VPOL16A-12-SMT Series Output Voltage Adustment. 5.4 Safe Operating Area (SOA) 7.9 Output Ripple and Noise Measurement 5.5 Over Current Protection 7.10 Output Capacitance 5.6 Remote ON/OFF 7.11 VPOL16A-12-SMT Reflow Profile 5.7 UVLO (Under-Voltage Lockout) 6. SAFETY 6.1 Input Fusing and Safety Considerations. 7.3 Thermal Considerations 7.7 Test Set-Up 8. MECHANICAL OUTLINE DIAGRAMS 8.1 VPOL16A-12-SMT Mechanical Outline Diagrams 8.2 VPOL16A-12-SMT Tape and Reel Dimensions 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. PART NUMBER: VPOL16A-12-SMT page 2 of 12 date 08/2007 DESCRIPTION: point of load converter The converter is also protected against over-temperature conditions. If 1. Introduction the converter is overloaded or the ambient temperature gets too high, the converter will shut down to protect the unit. This application note describes the features and functions of CUI INC's VPOL16A-12-SMT series of non-isolated dc-dc converters. These are L1 Q1 +VIN +VO highly efficient, reliable and compact, high power density, single output dc-dc converters. These “Point of Load” modules serve the needs Q2 C1 specifically of the fixed and mobile telecommunications and computing D1 C2 R sense +SENSE market, employing economical distributed Power Architectures. The VPOL16A-12-SMT series provide precisely regulated output voltage range from 0.75V to 5.0Vdc over a wide range of input voltage (Vi=9.0 – COM COM 14Vdc) and can operate over an ambient temperature range of –40°C PWM IC to +85°C. Ultra-high efficiency operation is achieved through the use of synchronous rectification and drive control techniques. ON/OFF R1 R trim ERR AMP TRIM R2 The modules are fully protected against short circuit and overtemperature conditions. CUI INC's world class automated manufacturing methods, together with an extensive testing and Figure 1. Electrical Block Diagram qualification program, ensure that all VPOL16A-12-SMT series converters are extremely reliable. 3.2 Thermal Packaging and Physical Design. 2. VPOL16A-12-SMT Converter Features The VPOL16A-12-SMT series uses a multi-layer FR4 PCB High efficiency topology, typically 94% at 5.0Vdc Industry standard footprint Wide ambient temperature range, -40°C to +85°C Cost efficient open frame design Programmable output voltage via external resistor from 0.75 to 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 side. Thus, the heat dissipation of the power components is optimized, ensuring that control components are not thermally stressed. The converter is an open-frame product and has no case or case pin. The open-frame design has several advantages over encapsulated closed devices. Among these advantages are: 5.0Vdc Efficient Thermal Management: the heat is removed from the No minimum load requirement (Stable at all loads) heat generating components without heating more sensitive, small Remote ON/OFF signal control components. Remote sense compensation Environmental: Lead free open-frame converters are more easily Fixed switching frequency re-cycled. Continuous short-circuit protection and over current protection Cost Efficient: No encapsulation. Cost efficient open-frame Over-temperature protection (OTP) construction. Monotonic Startup with pre-bias at the output. Reliable: Efficient cooling provided by open frame construction UL/IEC/EN60950 Certified. offers high reliability and easy diagnostics. 3. General Description 3.1 Electrical Description A block diagram of the VPOL16A-12-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 VPOL16A-12-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 VPOL16A-12-SMT series converters do not draw any reverse current at start-up. The output voltage can be adjusted from 0.75 to 5.0vdc, 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 For more information, please visit the product page. rev. page 3 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 4. Technical Specifications (All specifications are typical at nominal input, full load at 25°C unless otherwise noted.) Device PARAMETER NOTES and CONDITIONS ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous Operating Temp erature See Thermal Considerations Section Min. Typical Max. Units ALL 0 15 Vdc ALL -40 +85 °C ALL -55 +125 °C ALL 9.0 14 Vdc ALL ALL ALL ALL 8.0 Storage Temperature INPUT CHARACTERISTICS Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage 12 Vdc Vdc Vdc 7.7 0.3 11 A Maximum Input Current Vin=0 to 14Vdc , Io=Io,max. No-Load Input Current Vo=0.75V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Vo=5.0V ALL Off Converter Input Current Shutdown input idle current ALL 10 mA ALL 0.1 As 2 Inrush Current (I t) Input Reflected-Ripple Current P-P thru 1uH inductor, 5Hz to 20MHz 40 50 50 60 60 65 75 75 mA ALL 300 -1.5% Vo,set +1.5% 2 mA OUTPUT CHARACTERISTIC Output Voltage Set Point Vin=Nominal Vin , Io=Io.max, Tc=25°C ALL Output Voltage Trim Adjustment Range Selected by an external resistor ALL 0.75 5.0 Vdc Vdc Output Voltage Regulation Load Regulation Io=Io.min to Io.max ALL -0.5 +0.5 % Line Regulation Vin=low line to high line ALL -0.2 +0.2 % Tempera ture Coefficient Ta=-40°C to 85°C ALL -0.03 +0.03 %/°C Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth Peak-to-Peak Full Load, 1uF ceramic and 10uF tantalum ALL 75 mV RMS Full Load, 1uF ceramic and 10uF tantalum ALL 30 mV Low ESR ALL 8000 uF ALL 0 Output DC Current-Limit Inception Output Voltage =90% Nominal Output Voltage ALL 18 Shout Circuit Protection Continuous with Hiccup Mode ALL External Capacitive Load Operating Output Current Range 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 23 16 A 28 A For more information, please visit the product page. rev. 4 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT PARAMETER DYNAMIC CHARACTERISTICS page NOTES and CONDITIONS Device Min. Typical Max. Units Output Voltage Transient Response Error Brand 50% Step Load Change, di/dt=0.1A/us ALL 200 mV Setting Time (within 1% Vout nominal) 50% Step Load Change, di/dt=0.1A/us ALL 200 us EFFICIENCY 100% Load Vo=0.75V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Vo=5.0V ALL Non-isolation ALL 77 83 86 88 89 90 92 94 % ISOLATION CHARACTERISTICS Input to Output 0 Vdc FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control, Positive Logic Remote On/Off Logic Low (Module Off) Logic High (Module On) ALL or Open Circuit ON/OFF Control, Negative Logic Remote On/Off Logic Low (Module On) or Open Circuit 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 VPOL16A-12-SMT 0 VPOL16A-12-SMT 2.8 KHz 0.4 Vdc Vdc Vin Vdc 1 1 mA mA Vin Ion/off at Von/off =0.0V Logic High, Von/off=14V ALL ALL Von/off to 10 %Vo,set Vin,min. to 10%V o,set 10%Vo,set to 90 %Vo,set ALL ALL ALL ALL 3.5 3.5 3.5 130 ms ms ms °C ALL 0.98 M hours ALL 10 grams GENERAL SPECIFICATIONS MTBF Weight Dimensions VPOL16A-12-SMT packages Io=100%of Io.max;Ta=2 5°C per MIL-HDBK217F 1.3x0.53x0.366 inches(33.0x13.46x9.3 mm) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. page 5 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 5.5 Over Current Protection 5. Main Features and Functions All different voltage models have a full continuous short-circuit 5.1 Operating Temperature Range To provide pr otection in a fault condition, the unit is equipped with CUI INC's VPOL16A-12-SMT series converters highly efficient converter design has resulted in its ability to operate over a wide ambient temperature environment ( -40°C to 85°C). Due consideration must be given to the de-rating curves when ascertaining maximum power that can be drawn from the converter. The maximum power drawn is influenced by a number of factors, such as: Input voltage range. protection. The unit will auto recover once the short circuit is removed. internal over-current protection. The unit operates normally once the fault condition is 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 protection. 5.6 Remote ON/OFF The remote ON/OFF input feature of the converter allows external circuitry to turn the converter ON or OFF. Active-high remote ON/OFF 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. 5.2 Over-Temperature Protection (OTP) The VPOL16A-12-SMT Series converters are equipped with nonlatching over-temperature protection. A temperat ure sensor monitors the temperature of the hot spot (typically, top switch). If the temperature exceeds a threshold of 130°C (t ypical) the converter will shut down, is available as standard. The VPOL16A-12-SMT are turned on if the remote ON/OFF pin is high(=Vin), or left open. Setting the pin low(<0.4Vdc) will 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 the pin open (module will be on). The part number suffix “N” is Negative 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 (<0.4Vdc) or left open. The recommended VPOL16A-12-SMT remote on/off drive circuit as shown as figure 3, 4. 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 7.8 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 0.75 – 5.0Vdc. 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 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. 6 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT +Vin ON/OFF Control page +Vo 7. Applications 7.1 Layout Design Challenges. Remote ON/OFF Q1 In optimizing thermal design the PCB is utilized as a heat sink. Also VPOL16A-12-SMT some heat is transferred from the VPOL16A-12-SMT module to the main board through connecting pins. The system designer or the end Common Common user must ensure that other components and metal in the vicinity of the VPOL16A-12-SMT series meet the spacing requirements to which the Figure 3. Positive Remote ON/OFF Input Drive Circuit +Vin Q1 ON/OFF Control +Vo VPOL16A-12-SMT system is approved. Low resistance and low inductance PCB layout traces are the norm and should be used where possible. Due consideration must also be given to proper low impedance tracks between power module, input and output grounds. The recommended VPOL16A-12-SMT footprint is shown as 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) 4.83 4.83 4.83 (0.190) (0.190) (0.190) 7.87 (0.310) 5.7 UVLO (Under-Voltage Lockout) The voltage on the Vcc pin determines the start of the operation of the Converter. When the input Vcc rises and exceeds about 8.0V the converter initiates a soft start. The UVLO function in the converter has a +SENSE TRIM 10.29 (0.405) 0.64 (0.025) 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. COM 10.92 (0.430) Top View of Board ON/OFF hysteresis (about 300mV) built in to provide noise immunity at start-up. 6. Safety +VO +VIN 29.90 (1.177) PAD SIZE MIN:3.556x2.413(0.140x0.095) MAX:4.19x2.79(0.165x0.110) Figure 5. Recommended VPOL16A-12-SMT Footprint 1.The power supply shall be approved by a nationally recognized rd testing 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 VPOL16A-12-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 For more information, please visit the product page. rev. DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT TYPICAL POWER DERATING FOR 5 Vin 3.3 Vout 18 16 Output Current(A) 14 12 10 0LFM 100LFM 200LFM 300LFM 8 6 4 2 0 0 10 20 30 40 50 60 70 80 90 100 Ambient Temperature(oC) NOTE: 1. specific input & output derating curves available, please contact CUI INC for detail 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 page 7 of 12 date 08/2007 For more information, please visit the product page. rev. page 8 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 7.5 Efficiency vs Load Curves (Fig. 9) VPOL16A-12-SMT Vo=5.0V (Eff Vs Io) VPOL16A-12-SMT Vo=3.3V (Eff Vs Io) 95% 95% 90% 85% 9.0V 12V 14V 80% 75% 70% Efficincy (%) 100% Efficincy (%) 100% 90% 85% 9.0V 12V 14V 80% 75% 70% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Current Load (A) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Current Load (A) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. VPOL16A-12-SMT Vo=2.5V (Eff Vs Io) 95% 95% 90% 85% 9.0V 12V 14V 80% 75% Efficincy (%) 100% Efficincy (%) date 08/2007 VPOL16A-12-SMT Vo=2.0V (Eff Vs Io) 100% 90% 85% 9.0V 12V 14V 80% 75% 70% 70% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0 1 2 3 4 Current Load (A) VPOL16A-12-SMT Vo=1.8V (Eff Vs Io) 95% 90% 90% 85% 80% 9.0V 12V 14V 65% Efficincy (%) 95% 70% 6 7 8 9 10 11 12 13 14 15 16 VPOL16A-12-SMT Vo=1.5V (Eff Vs Io) 100% 75% 5 Current Load (A) 100% Efficincy (%) 9 of 12 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 85% 80% 9.0V 12V 14V 75% 70% 65% 60% 60% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0 1 2 3 4 Current Load (A) 5 6 7 8 9 10 11 12 13 14 15 16 Current Load (A) VPOL16A-12-SMT Vo=1.2V (Eff Vs Io) VPOL16A-12-SMT Vo=0.75V (Eff Vs Io) 100% 100% 95% 95% 90% 85% 80% 9.0V 12V 14V 75% 70% 65% 60% Efficincy (%) 90% Efficincy (%) page 85% 80% 75% 70% 9.0V 12V 14V 65% 60% 55% 50% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Current Load (A) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Current Load (A) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. Where: 7.6 Input Capacitance at the Power Module The VPOL16A-12-SMT converters must be connected to a low AC source impedance. To avoid probl ems with loop stability source However, the external input capacitors are chosen for suitable ripple handling capability. Low ESR polymers are a good choice. They have Line.reg= VLL is the output voltage of minimum input voltage at full load. Current Meter Electrolytic capacitors should be avoided. Circuit as shown in Figure 11 A represents typical measurement methods for ripple current. Input reflected-ripple current is measured with a simulated source Inductance of 1uH. Current is measured at the input of the module. Power Supply +Vin + V 100uF Voltage Meter VPOL16A-12-SMT Common L1 +Vin A +Vo +Sense To Oscilloscope Supply VHL _ VLL x 100% VLL Where: VHL is the output voltage of maximum input voltage at full load. high capacitance, high ripple rating and low ESR (typical <100mohm). 2*100uF Tantalum 08/2007 The value of line regulation is defined as: close to the converter input pins to de-couple distribution inductance. + date VFL is the output voltage at full load VNL is the output voltage at no load inductance should be low. Also, the input capacitors should be placed Power 10 of 12 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 1uH page V Load Common Figure 11. VPOL16A-12-SMT Series Test Setup 7.8 Remote Sense Compensation VPOL16A-12-SMT 220uF ESR<0.1ohm Remote Sense regulates the output voltage at the point of load. It minimizes the effects of distribution losses such as drops across the connecting pin and PCB tracks (see Figure 12). Please note however, the maximum drop from the output pin to the point of load should not Common exceed 500mV for remote compensation to work. The amount of power delivered by the module is defined as the output Figure 10. Input Reflected-Ripple Test Setup 7.7 Test Set-Up The basic test set-up to measure parameters such as efficiency and load regulation is shown in Figure 11. Things to note are that this converter is non-isolated, as such the input and output share a common ground. These grounds should be connected together via low impedance ground plane in the application circuit. When testing a voltage multiplied by the output current (VO x IO). When using TRIM UP, the output voltage of the module will increase which, if the same output current is maintained, increases the power output by the module. Make sure that the maximum output power of the module remains at or below the maximum rated power. When the Remote Sense feature is not being used, leave sense pin disconnected. Figure 12. 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 CUI INC's VPOL16A-12-SMT series under any transient conditions please ensure that the transient response of the source is sufficient to power the equipment under test. We can calculate the Efficiency Distribution Losses +Vin Load regulation and line regulation. +Vo +Sense The value of efficiency is defined as: Vo x Io x 100% ç= Vin x Iin VPOL16A-12-SMT Common Where: Vo is output voltage, Common R-Load Distribution Losses Io is output current, Vin is input voltage, Iin is input current. The value of load regulation is defined as: Load .reg= VFL _ VNL x 100% VNL 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. page 11 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 7.8 VPOL16A-12-SMT Series Output Voltage Adustment. 7.9 Output Ripple and Noise Measurement The output voltage of the VPOL16A-12-SMTS05A can be adjusted in 17. a coaxial cable with a 50ohm termination was used to prevent the range 0.75V to 5.0V by connecting a single resistor on the impedance mismatch reflections disturbing the noise readings at higher motherboard (shown as Rtrim) in Figure 13. When Trim resistor is not frequencies. The test set-up for noise and ripple measurements is shown in Figure connected the output voltage defaults to 0.75V +Vin +Vin +Vo +Vo 10uF Tant. VPOL16A-12-SMT 1uF Ceramic R-Load Test Jack Trim R-Load VPOL16A-12-SMT Common Common R trim-up Figure 14. Output Voltage Ripple and Noise Measurement Set-Up Common Common 7.10 Output Capacitance Figure 13. Trim-up Voltage Setup The value of Rtrim-up defined as: CUI INC's VPOL16A-12-SMT series converters provide unconditional stability with or without external capacitors. For good transient response low ESR output capacitors should be located close to the point of load. Rtrim = ( Where: 10500 _ 1000 ) Vo _ .750 For high current applications point has already been made in layout considerations for low resistance and low inductance tracks. Output capacitors with its associated ESR values have an impact on Rtrim-up is the external resistor in ohm, loop stability and bandwidth. CUI INC's converters are designed to Vo is the desired output voltage work with load capacitance up-to 8,000uF. It is reco mmended that any To give an exa mple of the above calculation, to set a voltage of 3.3Vdc, additional capacitance, Maximum 8,000uF and low ESR, be connected Rtrim is given by: close to the point of load and outside the remote compensation point. Rtrim = ( 10500 _ 1000 ) _ 3 . .75 30 Rtrim = 3117 ohm 7.11 VPOL16A-12-SMT Reflow Profile An example of the VPOL16A-12-SMT reflow profile is given in Fig 15. Equipment used: SMD HOT AIR REFLOW HD-350SAR Alloy: AMQ-M293TA or N C-SMQ92 IND-82088 SN63 For various output values various resistors are calculated and provided Rtrim (Kohm) Open 22.33 13.0 9.0 7.4 5.0 3.12 1.47 Table 3 – Trim Resistor Values 200 TEMPERATURE (C) Vo,set (V) 0.75 1.20 1.50 1.80 2.00 2.50 3.30 5.0 REFLOW PROFILE 240 in Table 3 for co nvenience. 160 120 80 40 0 0 30 60 90 120 150 180 210 240 TIME (SECONDS) Figure 15 VPOL16A-12-SMT Reflow Profile 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 For more information, please visit the product page. rev. page 12 of 12 date 08/2007 DESCRIPTION: point of load converter PART NUMBER: VPOL16A-12-SMT 8. Mechanical Outline Diagrams 8.2 VPOL16A-12-SMT Tape and Reel Dimensions 8.1 VPOL16A-12-SMT Mechanical Outline Diagrams Dimensions are in millimeters and inches The Ta pe Reel dimensions for the VPOL16A-12-SMT module is shown in Figure 17. Tolerance: x.xx ±0.02 in. (0.5mm) , x.xxx ±0.010 in. (0.25 mm) unless otherwise noted Po P2 P D 7.87 (0.310) 4.83 COM 1.60 (0.063) 4.83 4.83 (0.190) (0.190) (0.190) +VO 7.54 1.65 (0.065) (0.297) TRIM +SENSE W 9.30 (0.366) max. 33.0 (1.30) Bo F BOTTOM VIEW OF BOARD t E Ao 10.29 13.46 (0.405) (0.530) ON/OFF +VIN SURFACE MOUNT CONTACT 2.84 (0.112) 1.22 (0.048) 1.91 (0.075) L1 INDUCTOR Dimensions are in millimeters(Inches) Tolerances :X.X ±0.5mm(0.02in),X.XX ±0.25mm(0.010in),unless __ otherwise noted. Figure 16 VPOL16A-12-SMT Mechanical Outline Diagram W Ao Bo Ko P F E D D1 Po P2 t Figure 17 – VPOL16A-12-SMT Tape an d Reel Dimensions 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 Ko