Technical Specification PQ60025EGL25 35-75V 100V 2.5V 25A 2000V dc Eighth-brick Input Transient Input Output Current Isolation DC-DC Converter The PQ60025EGL25 PowerQor Giga eighth-brick converter is a next-generation, board-mountable, isolated, fixed switching frequency DC/DC converter that uses synchronous rectification to achieve extremely high conversion efficiency. The power dissipated by the converter is so low that a heatsink is not required, which saves cost, weight, height, and application effort. All of the power and control components are mounted to the multi-layer PCB substrate with highyield surface mount technology. Since the PowerQor converter has no explicit thermal connections, it is extremely reliable. Protection Features • • • • • Input under-voltage lockout disables converter at low Vin conditions Output current limit Short circuit protection Protection from permanent damage and hazardous conditions Thermal shutdown protects converter from abnormal conditions PQ60025EGL25 Model Operational Features • • • • • • Mechanical Features • • • • Industry standard eighth-brick pin-out configuration Industry standard size: 0.90” x 2.3” Total height less than 0.335” (8.5mm) Total weight: 0.68 oz. (19g) High efficiency, 89% half load, 85% at full load Delivers 25A full power with minimal derating - no heatsink required Operating input voltage range: 35-75V Input voltage transient capability: 100V, 100ms Fixed frequency switching provides predictable EMI No minimum load requirement Control Features • On/Off control referenced to input side • Positive and negative logic options are available • Remote sense for Vout compensates for output distribution drops Contents Safety Features • • • • Page No. UL 60950-1:2007 EN60950-1/A11:2009/A1:2010 CAN/CSA-C22.2 No. 60950-1:2007 IEC 61000-4-2 Product # PQ60025EGL25 Phone 1-888-567-9596 Mechanical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Standards & Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 1 Technical Specification PQ60025EGL25 Open Frame Mechanical Diagram Top View 0.600 (15.24) 0.450 (11.43) Side View 0.90 (22.86) EGA 0.410 (10.41) max height See Note 9 0.300 (7.62) 0.150 (3.81) .340 ±.014 (8.64 ±0.35) 0.110 (2.79) 8 7 6 5 4 2.30 (58.42) 2.00 (50.8) See Note 3 0.14 (3.56) 1 2 EGA Bottom side Clearance 0.089 (2.26) min clearance See Note 9 3 0.150 (3.81) 0.300 (7.62) 0.600 (15.24) PIN FAR SIDE TYPICAL SEE NOTES 1, 2, AND 3 NOTES .019 ±.013 (0.48 ±0.33) BOTTOMSIDE CLEARANCE PIN DESIGNATIONS Pin Name 1 Vin(+) Function 1) Pins 1-3, 5-7 are 0.040” (1.02mm) diameter with 0.080” (2.03mm) diameter standoff shoulders. 2) Pins 4 and 8 are 0.062” (1.57 mm) diameter with 0.100” (2.54 mm) diameter standoff shoulders. 2 ON/OFF 3) Other pin extension lengths available. Recommended pin length is 0.03” (0.76mm) greater than the PCB thickness. 3 Vin(–) 4) All Pins: Material - Copper Alloy- Finish - Matte Tin over Nickel plate 5) Undimensioned components are shown for visual reference only. 6) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/- 0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 7) Weight: 0.68 oz. (19g) typical 8) Workmanship: Meets or exceeds IPC-A-610C Class II 1) Pin 5 must be connected to Vout(-). 9) UL/TUV standards require a clearance greater than 0.04” (1.02mm) between input and output for Basic insulation. This issue should be considered if any copper traces are on the top side of the user’s board. Note that the ferrite cores are considered part of the input/primary circuit 2) Leave Pin 6 open for nominal output voltage. Product # PQ60025EGL25 Phone 1-888-567-9596 4 Vout(–) 5 Sense (-) 6 Trim 7 Sense (+) 8 Vout(+) Positive input voltage TTL input to turn converter on and off, referenced to Vin(–), with internal pull up. Negative input voltage Negative output voltage Negative remote sense (see note 1) Output voltage trim (see note 2) Positive remote sense (see note 3) Positive output voltage Notes: www.synqor.com 3) Pin 7 must be connected to Vout(+). Doc.# 005-2EG625B Rev. B 02/11/11 Page 2 Input: 35-75V Output: 2.5V Current: 25A Package: Eighth-brick Technical Specification PQ60025EGL25 Electrical Characteristics Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating Operating Operating Transient Protection 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 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 Recommended External Input Capacitance Input Filter Component Values (L\C) 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 Electrolytic EFFICIENCY 100% Load 50% Load Product # PQ60025EGL25 Typ. -40 -55 -2 Max. Units Notes & Conditions 100 80 100 2000 100 125 18 V V V V °C °C V 35 48 52 V 31.5 29.5 2.4 33.3 31.5 2.8 34.4 32.4 3.2 2.4 V V V A mA mA A²s mV mA mA A µF µH\µF 32 2 4 0.01 150 4.2 220 20 33 47 2.2\3.3 2.475 2.50 2.525 V ±0.1 \ 2.5 ±0.1 \ 2.5 ±13 ±0.2 \ 5 ±0.2 \ 5 ±38 2.57 %\mV %\mV Mv V 130 30 25 30.0 mV mV A A V A mA µF 2.43 70 17 0 26.0 Phone 1-888-567-9596 27.5 1.2 0.55 10 50 16,000 85 89 www.synqor.com % % Continuous Continuous 100ms transient Basic level, Pollution Degree 2 100% Load, 35V Vin 1000V/ms input transient RMS thru10μH inductor RMS Fast acting external fuse recommended Typical ESR 0.1-0.2Ω; Figure 13 Internal values Over sample, line, load, temperature & life 20MHz bandwidth Full load Full load Subject to thermal derating Output Voltage 10% Low See note 3 Negative current drawn from output Negative current drawn from output 2.5Vout at 25A Resistive Load Figures 1 - 2 Figures 1 - 2 Doc.# 005-2EG625B Rev. B 02/11/11 Page 3 Input: 35-75V Output: 2.5V Current: 25A Package: Eighth-brick Technical Specification PQ60025EGL25 Electrical Characteristics (continued) Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. Typ. DYNAMIC CHARACTERISTICS Input Voltage Ripple Rejection Output Voltage during Load Current Transient Step Change in Output Current (0.1A/µs) Step Change in Output Current (5A/µs) Settling time Turn-On Transient Turn-On Time Start-Up Inhibit Time 200 Output Voltage Overshoot ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) Isolation Resistance Isolation Capacitance (input to output) TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature Board Temperature Transformer Temperature FEATURE CHARACTERISTICS Switching Frequency 245 ON/OFF Control (Option P) Off-State Voltage -2.0 On-State Voltage 2.4 ON/OFF Control (Option N) Off-State Voltage 2.4 On-State Voltage -2.0 ON/OFF Control (Either Option) Pull-Up Voltage Pull-Up Resistance Output Voltage Trim Range -20 Output Voltage Remote Sense Range Output Over-Voltage Protection 120 Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis RELIABILITY CHARACTERISTICS Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF Product # PQ60025EGL25 Phone 1-888-567-9596 Max. Units Notes & Conditions 65 dB 120 Hz 120 180 200 mV mV µs 50% to 75% to 50% Iout max 50% to 75% to 50% Iout max To within 1% Vout nom 29 220 ms ms % Full load, Vout=90% nom; Figures 9 & 10 -40°C to +125°C 16,000 μF load capacitance, Iout = 0A V MΩ pF See Absolute Maximum Ratings 125 125 125 °C °C °C Package rated to 150°C UL rated max operating temp 130°C 285 kHz 0.8 18.0 V 18 0.8 V 15.00 V kΩ % 240 0 2000 30 470 260 See Note 4 Application notes; Figures A & B Vin/6 40 125 125 10 +10 +10 123 2.5 1.1 www.synqor.com % °C °C Measured across Pins 8 & 4; Figure C Over Full Temperature Range; % of nominial Vout Average PCB Temperature 106 Hrs. TR-NWT-000332; 80% load, 300LFM, 40°C Ta 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40°C Ta 106 Hrs. See our website for details Doc.# 005-2EG625B Rev. B 02/11/11 Page 4 Input: 35-75V Output: 2.5V Current: 25A Package: Eighth-brick Technical Specification Standards Compliance & Qualification Testing Parameter Notes & Conditions STANDARDS COMPLIANCE UL 60950-1:2007 Basic insulation EN60950-1/A11:2009/A1:2010 CAN/CSA-C22.2 No. 60950-1:2007 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 # PQ60025EGL25 # Units 32 5 5 10 5 5 5 15 pins Phone 1-888-567-9596 Test Conditions 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, y and 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.# 005-2EG625B Rev. B 02/11/11 Page 5 Technical Specification PQ60025EGL25 Technical Figures 92 95 91 90 85 Efficiency (%) Efficiency (%) 90 80 75 70 35 Vin 65 48 Vin 75 Vin 60 0 3 5 8 10 13 15 18 20 23 89 88 87 86 25 C 85 55 C 40 C 84 0 25 100 400 500 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). 8.0 12 11 10 9 8 7 6 5 4 3 2 1 0 7.0 Power Dissipation (W) Power Dissipation (W) 300 Air Flow (LFM) Load Current (A) Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 200 35 Vin 48 Vin 3 5 8 10 13 15 18 20 23 5.0 4.0 3.0 2.0 25 C 40 C 1.0 75 Vin 0 6.0 55 C 0.0 25 0 Load Current (A) 100 200 300 400 500 Air Flow (LFM) Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 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). 24 22 20 18 Iout (A) 16 14 12 10 400 LFM (2.0 m/s) 8 300 LFM (1.5 m/s) 6 200 LFM (1.0 m/s) 4 100 LFM (0.5 m/s) 2 50 LFM (0.25 m/s) 0 0 25 40 55 70 Semiconductor junction temperature is within 1°C of surface temperature 85 o Ambient Air Temperature ( C) Figure 5: Maximum output power derating curves vs. ambient air temperature for airflow rates of 50 LFM through 400 LFM with air flowing from input to output (nominal input voltage). Product # PQ60025EGL25 Phone 1-888-567-9596 Figure 6: Thermal plot of converter at 21A load current with 55°C air flowing at the rate of 200 LFM. Air is flowing from input to output (nominal input voltage). www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 6 Technical Specification PQ60025EGL25 Technical Figures 24 22 20 18 Iout (A) 16 14 12 10 400 LFM (2.0 m/s) 8 300 LFM (1.5 m/s) 6 200 LFM (1.0 m/s) 4 100 LFM (0.5 m/s) 2 50 LFM (0.25 m/s) 0 0 25 40 55 70 85 Ambient Air Temperature (oC) Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 50 LFM through 400 LFM with air flowing lenghtwise from pin 3 to pin 1 (nominal input voltage). Figure 8: Thermal plot of converter at 20A load current with 55°C air flowing at the rate of 200 LFM. Air is flowing across the converter from pin 3 to pin 1 (nominal input voltage). Figure 9: Turn-on transient at full load (10 ms/div). Ch 1: Vout (1V/div) Ch 2: ON/OFF input (5V/div) Figure 10: Turn-on transient at zero load (10 ms/div). Ch 1: Vout (1V/div) Ch 2: ON/OFF input (5V/div) Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 100µF100 mΩ ESR tantalum cap and 1µF ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div). Figure 12: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF 30 mΩ ESR tantalum cap and 1µF ceramic cap. Ch 1: Vout (50mV/div), Ch 2: Iout (10A/div). Product # PQ60025EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 7 Technical Specification PQ60025EGL25 Technical Figures Input Reflected Ripple Current 10µH source impedance Input Terminal Ripple Current iS iC Output Voltage Ripple DC-DC Converter VOUT VSOURCE electrolytic capacitor 47µF <1Ω ceramic capacitor 1µF tantalum capacitor 10µF 100mΩ ESR Figure 13: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 14), Input Reflected Ripple Current (Figure 15) and Output Voltage Ripple (Figure 16). Figure 14: 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 13). Figure 15: Input reflected ripple current, is, through a 10 µH source inductor at nominal input voltage and rated load current (5mA/div). (See Figure 13). Figure 16: Output voltage ripple at nominal input voltage and rated load current (50mV/div). Load capacitance: one 1.0µF ceramic capacitor and one 100µF electrolytic capacitor. Bandwidth: 20 MHz. (See Figure 13). 4.0 Output Voltage (V) 3.5 3.0 2.5 2.0 1.5 1.0 35 V 48 V 0.5 75 V 0.0 0 5 10 15 20 25 30 Load Current (A) Figure 17: Load current (20A/div) as a function of time when the converter attempts to turn on into a 10mΩ short circuit. Top trace (2.0ms/div) is an expansion of the on-time portion of the bottom trace. Product # PQ60025EGL25 Phone 1-888-567-9596 Figure 18: Output voltage vs. load current showing typical current limit curves and converter shutdown points. www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 8 Technical Specification PQ60025EGL25 Technical Figures -30 0.1 Forward Transmission (dB) -40 Output Impedance (ohms) 0.01 0.001 35 Vin 48 Vin 1,000 Hz 10,000 -70 -80 35 Vin -90 75 Vin -100 0.0001 100 -60 48 Vin 75 Vin 10 -50 -110 100,000 Figure 19: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power. 10 100 Hz 1,000 10,000 100,000 Figure 20: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power. -10 100 Reverse Transmission (dB) -15 Input Impedance (ohms) -20 -25 -30 35 Vin -35 1 35 Vin 48 Vin 48 Vin 75 Vin 75 Vin -40 10 10 100 1,000 Hz 10,000 Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power. Product # PQ60025EGL25 Phone 1-888-567-9596 0.1 100,000 10 100 1,000 Hz 10,000 100,000 Figure 22: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power. www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 9 Technical Specification PQ60025EGL25 Applications Section BASIC OPERATION AND FEATURES CONTROL FEATURES The 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 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 ON/OFF 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. REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’s output pins to the load. Pin 7 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 7 and 5 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 8 and 4) to determine when it should trigger, not the voltage across the converter’s sense leads (pins 7 and 5). Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. 5k Vin(+) Vin(_) Vin(_) Remote Enable Circuit Negative Logic (Permanently Enabled) 5V ON/OFF Vin(_) Positive Logic (Permanently Enabled) TTL/ CMOS Vin(_) 274k ON/OFF 50k TTL 100pF ON/OFF Vin(_) 50k Vin(_) Direct Logic Drive Open Collector Enable Circuit Figure A: Various circuits for driving the ON/OFF pin Figure B: Internal ON/OFF pin circuitry Product # PQ60025EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 10 Technical Specification PQ60025EGL25 Applications Section OUTPUT VOLTAGE TRIM (Pin 6): TThe 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 6 and Pin 7 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be: ( Rtrim-down = ) - 10.22(kΩ) 511% Δ% where To decrease the output voltage, the user should connect a resistor between Pin 6 and Pin 7 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be: Rtrim-up = ( 5.11Vout 1.225Δ% _ 511 Δ% - 10.22 ) kΩ where Trim Resistance (kOhms) 10,000 1,000 100 10 1 2 4 6 8 10 % increase Vout 12 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”. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical TurnOn 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. 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. Vout = Nominal Ouput Voltage 0 Protection Features 14 16 18 20 % decrease Vout Figure C: Trim Graph 2.5V Module. 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 overvoltage protection circuit to engage, particularly during transients. It is not necessary for the user to add capacitance at the Trim pin. The node is internally bypassed to eliminate noise. 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. 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 # PQ60025EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 11 Technical Specification PQ60025EGL25 Applications Section APPLICATION CONSIDERATIONS Input Filtering and External Input 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. More detailed information is available in the application note titled “EMI Characteristics” on the SynQor website. 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 web site (www.synqor.com) 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. Vout(+) Vin(+) Vin Vsense(+) Electrolytic Capacitor External Input Filter 47µF Trim ON/OFF Vsense(_) Vin(_) Rtrim-up or Rtrim-down Cload Iload Vout(_) Figure D: Typical application circuit (negative logic unit, permanently enabled). Lin Vin(+) C Vin(_) Figure E: Internal Input Filter Diagram (component values listed on page 3). Product # PQ60025EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 12 Technical Specification PQ60025EGL25 Applications Section 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: 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. When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical Turn-On Time. Input Under-Voltage Lockout. Input Over-Voltage Shutdown (not present in Quarter-brick) Output Over-Voltage Protection Over Temperature Shutdown Current Limit Short Circuit Protection Turned off by the ON/OFF input Figure F shows three turn-on scenarios, where a Startup Inhibit Period is initiated at t0, t1, and t2: Vin Under-Voltage Lockout Turn-On Threshold ON/OFF (pos logic) ON OFF OFF ON ON 9ms Vout (typical turn on time) 200ms 200ms 200ms (typical start-up inhibit period) t0 t1 t t2 Figure F: Startup Inhibit Period (turn-on time not to scale) Product # PQ60025EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG625B Rev. B 02/11/11 Page 13 Technical Specification PQ60025EGL25 Ordering Information 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 characters for options. Add “-G” to the model number for 6/6 RoHS compliance. PQ 6 0 0 2 5 E G L 2 5 N R S - G 6/6 RoHS Options (see Ordering Information) Model Number Input Voltage PQ60025EGw25xyz-G 35-75V Output Voltage 2.5V Max Output Current 25A Output Current Thermal Design The following options must be included in place of the w x y z spaces in the model numbers listed above. Performance Level Package Size Thermal Design Output Voltage A - Open Frame L - Low Profile Bottomside clearance: 0.019" EGL 0.089" EGA 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. Options Description: w x y z Enable Logic Pin Style N - Negative P - Positive K - 0.110" N - 0.145" R - 0.180" Y - 0.250" Feature Set S - Standard Not all combinations make valid part numbers, please contact SynQor for availability. See the Product Summary web page for more options. 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]. 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. Contact SynQor for further information: Phone: Toll Free: Fax: E-mail: Web: Address: Product # PQ60025EGL25 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 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702 7,765,687 7,787,261 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.# 005-2EG625B Rev. B 02/11/11 Page 14