VPOL10A-12W-SMT

rev. rev. page date 1 of 14 08/2007 PART NUMBER: VPOL10A-12W-SMT DESCRIPTION: point of load converter features * industry standard pin out * high efficiency to 90% * 300 KHz switching frequency * 6.0-14 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 certified * output voltage sequencing (tracking) * power good signal 1. INTRODUCTION 2. VPOL10A-12W-SMT CONVERTER FEATURES 3. GENERAL DESCRIPTION 3.1 Electrical Description 3.2 Thermal Packaging and Physical Design. 4. TECHNICAL SPECIFICATIONS 5. MAIN FEATURES AND FUNCTIONS 5.1 Operating Temperature Range 5.2 Over-Temperature Protection (OTP) 5.3 Output Voltage Adjustment 5.4 Safe Operating Area (SOA) 5.5 Over Current Protection 5.6 Remote ON/OFF 5.7 UVLO (Under-Voltage Lockout) 5.8 Output Voltage Sequencing (Tracking) 6. SAFETY 6.1 Input Fusing and Safety Considerations. 7. APPLICATIONS 7.1 Layout Design Challenges. 7.2 Convection Requirements for Cooling 7.3 Thermal Considerations 7.4 Power De-Rating Curves 7.5 Efficiency vs Load Curves 7.6 Input Capacitance at the Power Module 7.7 Test Set-Up 7.8 Remote Sense Compensation 7.9 VPOL10A-12W-SMT Series Output Voltage Adustment. 7.10 Output Ripple and Noise Measurement 7.11 Output Capacitance 7.12 VPOL10A-12W-SMT Reflow Profile 8. MECHANICAL OUTLINE DIAGRAMS 8.1 VPOL10A-12W-SMT Mechanical Outline Diagrams 8.2 VPOL10A-12W-SMT Tape and Reel Dimensions 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 phone fax rev. page date 2 of 14 08/2007 PART NUMBER: VPOL10A-12W-SMT DESCRIPTION: point of load converter Positive logic implies that the converter is enabled if the remote 1. Introduction This application note describes the features and functions of V-Infinity’s VPOL10A-12W-SMT series of Non Isolated DC-DC Converters. These are highly efficient, reliable and compact, high power density, single output DC/DC converters. These “Point of Load” modules serve the needs specifically of the fixed and mobile telecommunications and computing market, employing economical distributed Power Architectures. The VPOL10A-12W-SMT series provide precisely regulated output voltage range from 0.7525V to 5.0Vdc over a wide range of input voltage (Vi=6.0 – 14Vdc) and can operate over an ambient temperature range of –40 to +85. Ultradrive control techniques. The modules are fully protected against short circuit and overtemperature conditions. V-Infinity’s world class automated manufacturing methods, together with an extensive testing and qualification program, ensure that all VPOL10A-12W-SMT series converters are extremely reliable. high efficiency ON/OFF input is high (or floating), and disabled if it is low. The converter is also protected against over-temperature conditions. If the converter is overloaded or the ambient temperature gets too high, the converter will shut down to protect the unit. Q1 +VIN L1 +VO C1 Q2 D1 R sense C2 +SENSE COM COM operation is achieved through the use of synchronous rectification and PGood ON/OFF SEQ R1 PWM IC ERR AMP R trim R2 TRIM Figure 1. Electrical Block Diagram 2. VPOL10A-12W-SMT Converter Features High efficiency topology, typically 95% at 5.0Vdc Industry standard footprint Wide ambient temperature range, -40C to +85C Cost efficient open frame design Programmable output voltage via external resistor from 0.7525 to 5.0Vdc No minimum load requirement (Stable at all loads) Remote ON/OFF Remote sense compensation Fixed switching frequency Continuous short-circuit protection and over current protection Over-temperature protection (OTP) Monotonic Startup with pre-bias at the output. UL/IEC/EN60950 Certified. Output Voltage Sequencing( Tracking ) Power Good Signal (Option) 3.2 Thermal Packaging and Physical Design. The VPOL10A-12W-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 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: Efficient Thermal Management: the heat is removed from the heat generating components without heating more sensitive, small signal control components. Environmental: Lead free open-frame converters are more easily re-cycled. Cost Efficient: No encapsulation. Cost efficient open-frame construction. 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 VPOL10A-12W-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 VPOL10A-12W-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 VPOL10A-12W-SMT series converters do not draw any reverse current at start-up. The output voltage can be adjusted from 0.7525 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. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 phone fax rev. page date 3 of 14 08/2007 PART NUMBER: VPOL10A-12W-SMT DESCRIPTION: point of load converter 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 Storage Temperature NOTES and CONDITIONS ALL ALL Device Min. Typical Max. Units 0 -40 ALL -55 16 +85 +125 Vdc °C °C INPUT CHARACTERISTICS Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current Vin=0 to 14Vdc , Io=Io,max. Vo=0.7525V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Vo=5.0V Shutdown input idle current Vo=4.5V Vo=5.0V ALL ALL ALL ALL ALL 6.0 6.5 5.0 4.0 1.0 10 40 40 50 50 60 65 75 95 10 0.4 200 12 12 14 14 Vdc Vdc Vdc Vdc A No-Load Input Current ALL mA Off Converter Input Current Inrush Current (I t) Input Reflected-Ripple Current 2 ALL ALL mA As mA 2 P-P thru 1uH inductor, 5Hz to 20MHz ALL OUTPUT CHARACTERISTIC Output Voltage Set Point Output Voltage Trim Adjustment Range Output Voltage Regulation Load Regulation Line Regulation Tempera ture Coefficient Output Voltage Ripple and Noise Peak-to-Peak RMS External Capacitive Load Operating Output Current Range Output DC Current-Limit Inception Shout Circuit Protection Sequency Slew Rate Capability Sequencing Delay Time Tracking Accuracy Power Good Signal Power up Power down Asserted Logic High Vo ALL Suffix “P” 90 Output Voltage =90% Nominal Output Voltage Continuous with Hiccup Mode dVSEQ/dt 10 200 400 110 0.1 1.0 V/ms ms mV % Io=Io.min to Io.max Vin=low line to high line Ta=-40° C to 85°C 5Hz to 20MHz bandwidth Full Load, 1uF ceramic and 10uF tantalum Full Load, 1uF ceramic and 10uF tantalum Low ESR ALL ALL ALL ALL ALL 0 15 20 75 30 8000 10 25 mV mV uF A A ALL ALL ALL -0.5 -0.2 -0.03 +0.5 +0.2 +0.03 % % %/°C Vin=Nominal Vin , Io=Io.max, Tc=25°C Selected by an external resistor ALL ALL -1.5% Vo,set +1.5% 0.7525 5.0 Vdc Vdc 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 phone fax rev. page date 4 of 14 08/2007 PART NUMBER: VPOL10A-12W-SMT DESCRIPTION: point of load converter Error Brand Setting Time (within 1% Vout nominal) 50% Step Load Change, di/dt=2.5A/us 50% Step Load Change, di/dt=2.5A/us ALL ALL 200 200 mV us EFFICIENCY Vo=0.7525V Vo=1.2V Vo=1.5V Vo=1.8V Vo=2.0V Vo=2.5V Vo=3.3V Vo=5.0V Non-isolation 82 87 89 90 91 92 93 95 0 100% Load ALL % ISOLATION CHARACTERISTICS Input to Output ALL Vdc FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control, Positive Logic Remote On/Off Logic Low (Module Off) Logic High (Module On) or Open Circuit ALL VPOL10A-12W-SMT 0 300 0.4 Vin 0.4 Vin 1 1 3 3 4 130 0.92 8.5 KHz Vdc Vdc Vdc Vdc mA mA ms ms ms °C M hours grams 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 Ion/off at Von/off =0.0V Logic High, Von/off=14V Von/off to 10%Vo,set Vin,min. to 10%Vo,set 10%Vo,set to 90%Vo,set VPOL10A-12W-SMT ALL ALL ALL ALL ALL ALL ALL ALL 0 2.8 GENERAL SPECIFICATIONS MTBF Weight Dimensions 1.3x0.53 Io=100%of Io.max;Ta=2 5°C per MIL-HDBK217F x0.346 inches(33.0x13.46x8.8 mm) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 phone fax rev. page date 5 of 14 08/2007 PART NUMBER: VPOL10A-12W-SMT DESCRIPTION: point of load converter 5. Main Features and Functions 5.1 Operating Temperature Range V-Infinity’s VPOL10A-12W-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. 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. 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 is available as standard. The VPOL10A-12W-SMT are turned on if the remote ON/OFF pin is high(=Vin), or left open. Setting the pin low(