Technical Specification PQ50050HPB50 48V 5.0V 50A 2000V dc Half-brick Input Output Current Isolation DC-DC Converter The PQ50050HPB50 PowerQor Peta halfbrick converter is a next-generation, boardmountable, isolated, fixed switching frequency DC/DC converter that uses synchronous rectification to achieve extremely high conversion efficiency.The Peta series converters offer industry leading output current for a standard half-brick module. RoHS compliant (see last page). Operational Features • • • • Protection Features Ultra-high efficiency, 92% at full rated load Delivers up to 250W of output power with minimal derating Operating input voltage range: 44-52V Fixed frequency switching provides predictable EMI performance • Input under-voltage lockout disables converter at low input voltage conditions • Output current limit and short circuit protection • Active back bias limit prevents damage to converter from external load induced pre-bias • Output over-voltage protection • Thermal shutdown Control Features Mechanical Features • • • • • On/Off control referenced to input side (positive and negative logic options are available) • Remote sense for the output voltage compensates for output distribution drops • Output voltage trim permits custom voltages and voltage margining • Output voltage trim range of -20%, +10% Industry standard pin-out configuration Size: 2.3” x 2.4” (58.4 x 61.0mm) Total height only 0.50” (12.7mm) Total weight: 4.3oz. (123 grams) Safety Features Contents Pending • 2000V, 30MΩ input-to-output isolation • UL 60950-1 recognized (US & Canada), basic insulation rating • TUV certified to EN60950-1 • Meets UL94V-0 flammability requirements Product # PQ50050HPB50 Phone 1-888-567-9596 Page No. MECHANICAL DIAGRAM (base-plated). . . . . . . . . . . . . . . . . . . . . . . . . 2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Standards and Qualifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 1 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification Baseplate Mechanical Diagram PIN DESIGNATIONS NOTES 1) 2) 3) 4) 5) 6) 7) 8) 9) Applied torque per screw should not exceed 3IN-LB (0.33Nm). Pin Name Function Baseplate flatness tolerance is 0.004” (.10mm) TIR for surface 1 Vin(+) Positive input voltage Pins 1, 2, 4, 6-8 are 0.040” (1.02mm) diameter, with 0.080” (2.03mm) diameter standoff shoulders. TTL input to turn converter on and off, 2 ON/OFF Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125” (3.18mm) referenced to Vin(–), with internal pull up. diameter standoff shoulders. 4 Vin(–) Negative input voltage Other pin extension lengths available. 5 Vout(-) Negative output voltage All Pins: Material: Copper Alloy 6 SENSE(–) Negative remote sense(see note 1) Finish: Matte Tin over Nickel plate 7 TRIM Output voltage trim (see note 2) Undimensioned components are shown for visual reference only. 8 SENSE(+) Positive remote sense (see note 3) Weight: 4.3oz (123g) for baseplated unit 9 Vout(+) Positive output voltage All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) Notes: x.xxx +/-0.010 in. (x.xx +/-0.25mm) SENSE(–) should be connected to Vout(–) either remotely or at 1) the converter. 2) Leave TRIM pin open for nominal output voltage. SENSE(+) should be connected to Vout(+) either remotely or 3) at the converter. Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 2 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification PQ50050HPB50 Electrical Characteristics Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +70 °C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating Operating Isolation Voltage Input to Output Operating Temperature Storage Temperature Voltage at ON/OFF input pin INPUT CHARACTERISTICS Operating Input Voltage Range Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Voltage Hysteresis Input Over-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Voltage Hysteresis Maximum Input Current No-Load Input Current Disabled Input Current Inrush Current Transient Rating Response to Input Transient Input Reflected Ripple Current Input Terminal Ripple Current Recommended Input Fuse Input Filter Component Values (C1\L\C2) Recommended External Input Capacitance OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage Back-Drive Current Limit while Enabled Back-Drive Current Limit while Disabled Maximum Output Capacitance Ceramic EFFICIENCY 100% Load 50% Load Product # PQ50050HPB50 Typ. -40 -55 -2 Max. Units Notes & Conditions 100 52 V V 2000 100 125 18 V dc °C °C V 44 48 52 V 31.5 29.5 2.2 33.3 31 2.3 34.4 32.4 2.4 V V V 58.2 56.6 1.5 59.7 58.1 1.6 61.3 59.2 1.8 6.0 120 5 0.04 100 2 350.0 5 200 20 1\3\6.4 47 4.95 5.00 ±0.05 \ 3 ±0.1 \ 5 ±15 4.85 30 5 0 53.7 1.5 0 Phone 1-888-567-9596 57.9 3.5 2.5 20 5.05 Continuous Continuous Basic insulation level, Pollution degree 2 Baseplate temperature V V V A 100% Load, 44 Vin mA mA A mV 1000V/ms input transient mA RMS thru 10μH inductor; Figs. 11 & 13 mA RMS: Figs. 11 & 12 A fast blow external fuse recommended µF\µH\µF internal values, see Figure E µF Typical ESR 0.1-0.2 Ω, See Figure 11 V Factory pre-set with Sense(+), Sense(-) open ±0.1 \ 5 % \ mV +0.2 \ 10 % \ mV ±30 mV 5.15 V Over sample, line, load, temperature & life 20 MHz bandwidth; Figs. 11 & 14 60 mV Full load, see Figures 11 & 14 mV 10 Full load, see Figures 11 & 14 50 A Subject to thermal derating; Fig. 5 62.1 A Output voltage 10% Low; Fig. 6 V 3.8 A Negative current drawn from output 50 mA Negative current drawn from output 34,000 µF 5Vout at 50A (Resistive Load) 92 93 www.synqor.com % % Figures 1-4 Figures 1-4 Doc.# 005-0005487 Rev. A 03/18/10 Page 3 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification PQ50050HPB50 Electrical Characteristics (continued) Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +70 °C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. Typ. Max. Units Notes & Conditions DYNAMIC CHARACTERISTICS Input Voltage Ripple Rejection 60 dB 120 Hz; fig. 17 Output Voltage during Load Current Transient Step Change in Output Current (0.1 A/µs) 200 mV 50% to 75% to 50% Iout max; figure 9 Step Change in Output Current (5 A/µs) 300 mV 50% to 75% to 50% Iout max; figure 10 Settling Time 100 µs To within 1% Vout nom Turn-On Transient Turn-On Time 22 30 ms Full load, Vout=90% nom.; Figs. 7 & 8 Start-Up Inhibit Time 180 200 240 ms -40oC to +125oC; Figure A Output Voltage Overshoot 0 % 10,000 µF load capacitance, Iout = 0A ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) 2000 V See Absolute Maximum Ratings Isolation Resistance 30 MΩ Isolation Capacitance (input to output) 3300 pF See Note 2 TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature 125 °C Package rated to 150 °C Board Temperature 125 °C UL rated max operating temp 130 °C Transformer Temperature 125 °C Maximum Baseplate Temperature 100 °C Applies to baseplated units only FEATURE CHARACTERISTICS Switching Frequency 198 220 242 kHz Regulation and isolation stages ON/OFF Control (Option P) Off-State Voltage -2 0.8 V On-State voltage 2.7 18 V ON/OFF Control (Option N) Off-State Voltage 2.7 18 V On-State voltage -2 0.8 V ON/OFF Control (either Option) Figures A, B Pull-Up Voltage Vin/6 15 V Pull-Up Resistance 42 kΩ Output Voltage Trim Range -20 +10 % Measured across Pins 9 & 5; Figure C Output Voltage Remote Sense Range +10 % Measured across Pins 9 & 5 Output Over-Voltage Protection 115 120 125 % Over full temp range; % of nominal Vout Over-Temperature Shutdown OTP Trip Point 120 °C Average PCB Temperature Over-Temperature Shutdown Restart Hysteresis 10 °C Load Current Scale Factor 1200 See App Note: Output Load Current Calc. RELIABILITY CHARACTERISTICS Calculated MTBF (Telcordia) TR-NWT-000332 2.13 106 Hrs. 75% load, 300LFM, 40 °C Ta Calculated MTBF (MIL-217) MIL-HDBK-217F 1.3 106 Hrs. 75% load, 300LFM, 40 °C Ta Field Demonstrated MTBF 106 Hrs. See our website for details Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor application support e-mail: [email protected] Note 2: Higher values of isolation capacitance can be added external to the module. Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 4 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification Standards and Qualifications Parameter Notes & Conditions STANDARDS COMPLIANCE Pending UL 60950-1:2003 Basic Insulation CAN/CSA-C22.2 No. 60950-1:2003 EN60950-1:2001 Needle Flame Test (IEC 695-2-2) Test on entire assembly; board & plastic components UL94V-0 compliant IEC 61000-4-2 ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance) Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website. Parameter QUALIFICATION TESTING Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability Product # PQ50050HPB50 # Units Test Conditions 32 5 5 10 5 5 5 15 pins Phone 1-888-567-9596 95% rated Vin and load, units at derating point, 1000 hours 10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis 100g minimum, 2 drops in x and y axis, 1 drop in z axis -40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles Toperating = min to max, Vin = min to max, full load, 100 cycles Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load 85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day MIL-STD-883, method 2003 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 5 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification 95 94 90 93 Efficiency (%) 95 Efficiency (%) 100 85 80 92 91 25º C 44 Vin 40º C 90 48 Vin 75 55º C 52 Vin 89 70 0 5 10 15 20 25 30 Load Current (A) 35 40 45 0 50 200 300 Air Flow (LFM) 400 Figure 2: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage). Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 24 14 22 20 13 18 Power Dissipation (W) Power Dissipation (W) 100 16 14 12 10 8 6 44 Vin 4 11 10 25º C 40º C 9 48 Vin 2 12 55º C 52 Vin 8 0 0 5 10 15 20 25 30 Load Current (A) 35 40 45 0 50 Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 100 200 300 Air Flow (LFM) 400 Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage). 7 50 6 Output Voltage (V) Iout (A) 40 30 20 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 LFM (0.0 m/s) 10 5 4 3 2 44 Vin 48 Vin 1 52 Vin 0 0 25 40 55 70 0 85 0 Ambient Air Temperature (oC) Figure 5: Maximum output power derating curves (no heatsink) vs. ambient air temperature for airflow rates of 0 LFM through 400 LFM with air flowing from input to output (nominal input voltage). Product # PQ50050HPB50 Phone 1-888-567-9596 5 10 15 20 25 30 35 Load Current (A) 40 45 50 55 60 Figure 6: Output voltage vs. load current showing typical current limit curves and converter shutdown points. www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 6 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification Figure 7: Turn-on transient at full load (resistive load) (10 ms/div). Input voltage pre-applied. Top Trace: Vout (2V/div). Bottom Trace: ON/OFF input (5V/div) Figure 8: Turn-on transient at zero load (10 ms/div). Top Trace: Vout (2V/div). Bottom Trace: ON/OFF input (5V/div) Figure 9: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF, 450mΩ ESR tantalum cap and 1µF ceramic cap. Top trace: Vout (200mv/div), Bottom Trace:Iout (20A/div). Figure 10: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF, 15mΩ ESR tantalum cap and 1µF ceramic cap. Top trace: Vout (200mv/div), Bottom Trace:Iout (20A/div). Input Reflected Ripple Current 10µH source impedance Input Terminal Ripple Current iS VSOURCE iC 47 µF, <1Ω ESR electrolytic capacitor Output Voltage Ripple DC-DC Converter VOUT 1 µF 15 µF, ceramic 450m Ω ESR capacitor tantalum capacitor Figure 11: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 12), Input Reflected Ripple Current (Figure 13) and Output Voltage Ripple (Figure 14). Product # PQ50050HPB50 Phone 1-888-567-9596 Figure 12: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10µH source impedance and 47µF electrolytic capacitor (200mA/div). (See Figure 11). www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 7 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification Figure 13: Input reflected ripple current, is, through a 10 µH source inductor at nominal input voltage and rated load current (5 mA/div). (See Figure 11). Figure 14: Output voltage ripple at nominal input voltage and rated load current (10 mV/div). Load capacitance: two 1µF ceramic capacitors and 15µF tantalum capacitor. Bandwidth: 20 MHz. (See Figure 11). Figure 15: Load current (20A/div) as a function of time when the converter attempts to turn on into a 1 mΩ short circuit. Top trace (2.5ms/div) is an expansion of the on-time portion of the bottom trace. Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 8 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification 0 0.1 0.01 0.001 44 Vin 48 Vin 52 Vin Forward Transmission (dB) Output Impedance (ohms) -10 -20 -30 -40 -50 -60 -70 44 Vin 48 Vin 52 Vin -80 -90 0.0001 -100 10 100 1,000 Hz 10,000 100,000 Figure 16: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power. 10 100 1,000 Hz 10,000 100,000 Figure 17: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power. 100 0 Input Impedance (ohms) Reverse Transmission (dB) -10 -20 -30 -40 44 Vin 48 Vin 52 Vin -50 10 1 44 Vin 48 Vin 52 Vin 0.1 -60 10 100 1,000 10,000 Hz Figure 18: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power. Product # PQ50050HPB50 Phone 1-888-567-9596 10 100,000 100 1,000 10,000 100,000 Hz Figure 19: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power. www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 9 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification BASIC OPERATION AND FEATURES CONTROL FEATURES The Power PowerQor series converter uses a two-stage power conversion topology. The first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The second stage uses a transformer to provide the functions of input/output isolation and voltage step-down to achieve the low output voltage required. REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance. Rectification of the transformer’s output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes. This is the primary reason that the Power PowerQor converter has such high efficiency, even at very low output voltages and very high output currents. Dissipation throughout the converter is so low that it does not require a heatsink for operation. Since a heatsink is not required, the PowerQor converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink. The PowerQor converter can thus be built more simply and reliably using high yield surface mount techniques on a PCB substrate. The PowerQor series of half-brick, quarter-brick and eighthbrick converters uses the industry standard footprint and pin-out configuration. ON/OFF Vin(_) Vin(_) Remote Enable Circuit ON/OFF ON/OFF Negative Logic (Permanently Enabled) 5V ON/OFF Vin(_) Positive Logic (Permanently Enabled) TTL/ CMOS REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’s output pins to the load. Pin 8 should be connected to Vout(+) and Pin 6 should be connected to Vout(-) at the point on the board where regulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is [Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] < Sense Range % x Vout Pins 8 and 6 must be connected for proper regulation of the output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. Note: the output over-voltage protection circuit senses the voltage across the output (pins 9 and 5) to determine when it should trigger, not the voltage across the converter’s sense leads (pins 8 and 6). Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. 5V Vin(+) 274k Vin(_) Vin(_) Open Collector Enable Circuit ON/OFF In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure A details five possible circuits for driving the ON/OFF pin. Figure B is a detailed look of the internal ON/OFF circuitry. ON/OFF 50k TTL Direct Logic Drive 100pF 50k Figure A: Various circuits for driving the ON/OFF pin. Vin(_) Figure B: Internal ON/OFF pin circuitry Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 10 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications.To decrease the output voltage, the user should connect a resistor between Pin 7 and Pin 6 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be Rtrim-down = -2 (100% D ) (kW) where D% = Vnominal – Vdesired Vnominal x 100% To increase the output voltage, the user should connect a resistor between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be nominal – 2 (V1.225 )xV Rtrim-up = DES + VNOM (kW) VDES - VNOM Figure C graphs the relationship between the trim resistor value and Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down. Trim Resistance (kOhms) Trim Resistance(kOhms) 100,000 10,000 10,000 1,000 100 100 1010 1 0 Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the application note titled “Input System Instability” on the SynQor website. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Input Over-Voltage Shutdown: Available on PQ48 models only. The converter turns off when the input voltage is too high, allowing the converter to withstand an input voltage as high as 100V without destruction. The shutdown circuitry is a comparator with DC hysteresis. When the input voltage exceeds the typical Input Over-Voltage Shutdown value, the converter will turn off. Once the converter is off, it will turn back on when the input voltage falls below the minimum Input Over-Voltage Shutdown value. Output Current Limit: The maximum current limit remains constant as the output voltage drops. However, once the impedance of the short across the output is small enough to make the output voltage drop below the specified Output DC Current-Limit Shutdown Voltage, the converter turns off. The converter then enters a “hiccup mode” where it repeatedly turns on and off at a 5 Hz (nominal) frequency with a 5% duty cycle until the short circuit condition is removed. This prevents excessive heating of the converter or the load board. 1,000 1 PROTECTION FEATURES 0 2 2 4 4 6 8 10 6 8 10 % increase Vout % increase Vout 12 14 16 12 14 16 % decrease Vout % decrease Vout 18 18 20 20 Figure C: Trim Graph Note: the TRIM feature does not affect the voltage at which the output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients. Output Over-Voltage Limit: If the voltage across the output pins exceeds the Output Over-Voltage Protection threshold, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. Load capacitance determines exactly how high the output voltage will rise in response to these conditions. After 200 ms the converter will automatically restart. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Over-Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value. It is not necessary for the user to add capacitance at the Trim pin. The node is internally bypassed to eliminate noise. Total DC Variation of Vout: For the converter to meet its full specifications, the maximum variation of the DC value of Vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 11 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification APPLICATION CONSIDERATIONS Input System Instability: This condition can occur because any DC/DC converter appears incrementally as a negative resistance load. A detailed application note titled “Input System Instability” is available on the SynQor website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits: Figure D below provides a typical circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Capacitance: Figure E below provides a diagram showing the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. The recommended external input capacitance is specified in the Input Characteristics section on the Electrical Specifications page. More detailed information is available in the application note titled “EMI Characteristics” on the SynQor website. Vout(+) Vin(+) Vin Electrolytic Capacitor External Input Filter Vsense(+) Trim ON/OFF Vsense(_) Vin(_) Rtrim-up or Rtrim-down Cload Iload Vout(_) Figure D: Typical application circuit (negative logic unit, permanently enabled). L Vin(+) C2 C1 Vin(_) Figure E: Internal Input Filter Diagram (component values listed on page 3). Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 12 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification Startup Inhibit Period: The Startup Inhibit Period ensures that the converter will remain off for approximately 200ms when it is shut down for any reason. When an output short is present, this generates a 5Hz “hiccup mode,” which prevents the converter from overheating. In all, there are seven ways that the converter can be shut down, initiating a Startup Inhibit Period: • Input Under-Voltage Lockout • Input Over-Voltage Shutdown (not present in Quarter-brick) • Output Over-Voltage Protection Figure F shows three turn-on scenarios, where a Startup Inhibit Period is initiated at t0, t1, and t2: Before time t0, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under-Voltage Lockout feature. When the input voltage rises above the UVL threshold, the Input Under-Voltage Lockout is released, and a Startup Inhibit Period is initiated. At the end of this delay, the ON/OFF pin is evaluated, and since it is active, the unit turns on. At time t1, the unit is disabled by the ON/OFF pin, and it cannot be enabled again until the Startup Inhibit Period has elapsed. • Over Temperature Shutdown • Current Limit When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical TurnOn Time. • Short Circuit Protection • Turned off by the ON/OFF input Vin Under-Voltage Lockout Turn-On Threshold ON/OFF (Positive logic) ON OFF ON OFF ON 25 ms 200ms Vout (typical turn on time) (typical turn start-up inhibit period time) t1 t0 200ms 200ms t2 t Figure F: Startup Inhibit Period (turn-on time not to scale) Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 13 Input:44-52V Output:5.0V Current:50A Part No.:PQ50050HPB50 Technical Specification PART NUMBERING SYSTEM ORDERING INFORMATION The part numbering system for SynQor’s dc-dc converters follows the format shown in the example below. The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. Add “-G” to the model number for 6/6 RoHS compliance. PQ 50 050 H P B 50 N N S - G 6/6 RoHS Options (see Ordering Information) Model Number Input Voltage Output Voltage Max Output Current PQ50050HPB50NNS 44-52V 5.0V 50A Output Current Thermal Design Performance Level Options Description: z The following options must be includedwinx yplace of the w x y z Package Size Output Voltage Thermal Design Enable Logic B - Baseplated N - Negative Pin Style Feature Set Input Voltage Product Family The first 12 characters comprise the base part number and the last 3 characters indicate available options. The “-G” suffix indicates 6/6 RoHS compliance. Application Notes A variety of application notes and technical white papers can be downloaded in pdf format from our website. RoHS Compliance: The EU led RoHS (Restriction of Hazardous Substances) Directive bans the use of Lead, Cadmium, Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical and Electronic Equipment. This SynQor product is 6/6 RoHS compliant. For more information please refer to SynQor’s RoHS addendum available at our RoHS Compliance / Lead Free Initiative web page or e-mail us at [email protected]. N - 0.145" S - Standard Not all combinations make valid part numbers, please contact SynQor for availability. See the Product Summary web page for more options. Many operational functions of this converter are programmable. Contact the factory regarding customizing. PATENTS SynQor holds the following U.S. patents, one or more of which apply to each product listed in this document. Additional patent applications may be pending or filed in the future. 5,999,417 6,731,520 7,072,190 7,272,023 6,222,742 6,894,468 7,085,146 7,558,083 6,545,890 6,577,109 6,594,159 6,896,526 6,927,987 7,050,309 7,119,524 7,269,034 7,272,021 7,564,702 Contact SynQor for further information: Phone: Toll Free: Fax: E-mail: Web: Address: Product # PQ50050HPB50 978-849-0600 888-567-9596 978-849-0602 [email protected] www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA Phone 1-888-567-9596 Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor. Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor. www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 14