SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Features • RoHS lead-free solder and lead-solder-exempted products are available • Industry-standard s-brick pin-out • Delivers 3.3V @ 20A with no derating up to 70°C (@ 48 Vin, ≥ 100 LFM) • Withstands 100V input transient for 100ms • Fixed-frequency operation • On-board input differential LC-filter • Start-up into pre-biased load • No minimum load required • Meets Basic Insulation requirements of EN60950-1 • Fully protected (OTP, OCP, OVP, UVLO) Applications • Remote output sense • Telecommunications • Positive or negative logic ON/OFF option • Data communications/processing • Output voltage trim range: +10%/−20% with • LAN/WAN Industry Standard trim equations • Servers, Workstations • Low height of 0.375” (9.5mm) • Weight: 21.4g, 32.9g with baseplate Benefits • High reliability: MTBF approx. 23.6 million hours, calculated per Telcordia SR-332, Method I Case 1 1 • High efficiency – no heat sink required • Approved to the following Safety Standards: th • Industry-standard 1/8 brick footprint: 0.896” x UL/CSA60950-1, EN60950-1, and IEC60950-1 2 2.30” (2.06 in ) - 38% smaller than conventional • Designed to meet Class B conducted emissions per quarter-bricks FCC and EN55022 when used with external filter • All materials meet UL94, V-0 flammability rating Description The new iPWER™ high performance 20A SQL48T20033 DC-DC converter provides a high efficiency single th brick package that is only 62% the size of the industry-standard quarter-brick. Specifically output, in a 1/8 designed for operation in systems that have limited airflow and increased ambient temperatures, the SQL48T20033 converter utilizes the same pin-out and Input/Output functionality of the industry-standard quarter- bricks. In addition, a heat spreader feature is available (-xxxBx suffix) that provides an effective thermal interface for coldplate and heat sinking options. The SQL48T20033 converter thermal performance is accomplished through the use of patent-pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal management, and a low- body profile. Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. The use of 100% automation for assembly, coupled with advanced electronic circuits and thermal design, results in a product with extremely high reliability. Operating from a wide-range 36-75V input, the SQL48T20033 converter provides a fully regulated 3.3V output voltage. The outputs can be trimmed from –20% to +10% of the nominal output voltage, thus providing outstanding design flexibility. Employing a standard power pin-out, the SQL48T20033 converter is an ideal drop-in replacement for existing high current quarter-brick designs. Inclusion of this converter in a new design can result in significant board space and cost savings. The designer can expect reliability improvement over other available converters because of the SQL48T20033’s optimized thermal efficiency. 1 Baseplate/heat spreader option (suffix ‘-xxxBx’) facilitates heatsink mounting to further enhance the unit’s thermal capability. Rev 0.2, 3-Mar-11 www.power-one.com Page 1 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Electrical Specifications Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. A Parameter Notes Min Typ Max Units Absolute Maximum Ratings Input Voltage Continuous -0.3 80 VDC Transient (100ms) 100 VDC 1 -40 85 °C Operating Temperature Ambient (T ) A -40 120 °C Component (T ) C -40 105 °C Baseplate (T ) (See Derating Curves) B Storage Temperature -55 125 °C Isolation Characteristics I/O Isolation 2,250 VDC Isolation Capacitance 270 pF Isolation Resistance 10 MΩ Input to Baseplate 1,500 VDC Output to Baseplate 1,500 VDC Feature Characteristics Switching Frequency 445 kHz 2 3 Output Voltage Trim Range Industry-std. equations -20 +10 % 2, 4 Remote Sense Compensation Percent of VOUT(NOM) +10 % Output Overvoltage Protection Non-latching 120 140 % Over Temperature Shutdown Non-latching 125 °C Auto-Restart Period Applies to all protection features 200 ms Turn-On Time from Vin Time from UVLO to Vo=90%V (NOM) OUT 5 20 ms Resistive Load Turn-On Time from ON/OFF Control Time from ON to Vo=90%V (NOM) OUT 5 20 ms Resistive Load ON/OFF Control (Positive Logic option) Converter Off (logic low) -20 0.8 VDC Converter On (logic high) 2.4 20 VDC ON/OFF Control (Negative Logic option) Converter Off (logic high) 2.4 20 VDC Converter On (logic low) -20 0.8 VDC Additional Notes: 1 Reference Figure H for component (T and T ) locations. C B 2 Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim-up should not exceed 10% of V (NOM). OUT 3 Trim equations are defined within this document’s “Operations” section. 4 When using remote sense a minimum of 100uF ceramic capacitance should be mounted between Vout(+) and Vout(-) close to pin 8 and pin 4. Rev 0.2, 3-Mar-11 www.power-one.com Page 2 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Electrical Specifications (continued) Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. A Parameter Notes Min Typ Max Units Input Characteristics Operating Input Voltage Range 36 48 75 VDC Input Undervoltage Lockout Turn-on Threshold 31.5 33.5 35.5 VDC Turn-off Threshold 30 32 34 VDC Lockout Hysteresis Voltage 1.0 2.0 VDC Maximum Input Current 3.3 Vout, Full Load @ 36VDC In 2.1 ADC Input Standby Current Vin = 48V, converter disabled 5 mADC Input No Load Current (No load on the output) Vin = 48V, converter enabled 45 mADC 200 400 mA PK-PK Input Reflected-Ripple Current, ic Vin = 48V, 20 MHz bandwidth, 150 mA RMS Full Load (resistive) 30 mA PK-PK (See Fig. J) Input Reflected-Ripple Current, i S 5 mA RMS Input Voltage Ripple Rejection @ 120 Hz 60 dB Output Characteristics Output Voltage Setpoint 3.25 3.3 3.35 VDC VIN=48V, I =0Amps, T =25°C OUT A Output Regulation Over Line I =20Amps, T =25°C ±2 ±17 mV OUT A Over Load V =48V, , T =25°C ±2 ±17 mV IN A Output Voltage Range Over line, load and temperature 3.2 3.4 VDC 30 100 mV PK-PK I =20Amps, OUT Output Ripple and Noise – 20 MHz bandwidth C =10 µF tantalum + 1 µF ceramic 15 30 V EXT RMS 1 Plus Full Load (resistive) C 0 10,000 µF External Load Capacitance EXT 1 mOhm ESR Output Current Range 0 20 ADC Current Limit Inception Non-latching 22 26 30 ADC Short-Circuit Current Pk: 30 Amps Non-latching Short = 10 mΩ 5 10 A RMS RMS: Dynamic Response di/dt = 0.1 A/μs ±50 mV C = 10µF tantalum + 1µF ceramic EXT Load Change 50%-75%-50% of I Max OUT di/dt = 1.0 A/μs ±100 mV C = 470µF POS + 1µF ceramic EXT Settling Time to 1% of V 20 µs OUT Efficiency @ 100% Load 91 % 48V , T =25°C, 300LFM (1.5 m/s) IN A % @ 50% Load 90 Additional Notes: 1 See “Input & Output Impedance”, Page 4. Rev 0.2, 3-Mar-11 www.power-one.com Page 3 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Environment and Mechanical Specifications Environmental Operating Humidity RH (Non-condensing) 95 % Storage Humidity RH (Non-condensing) 95 % Mechanical Weight No Baseplate 21.4 g With Baseplate 32.9 g Reliability Telcordia SR-332, Method I Case 1 MTBF ~23.6 MHrs 50% electrical stress, 40°C components EMI and Regulatory Compliance Conducted Emissions CISPR 22 B with external EMI filter network Safely Agency Approvals UL60950-1/CSA60950-1, EN60950-1 and IEC60950-1 Operations The positive logic version turns on when the ON/OFF Input and Output Impedance pin is at logic high and turns off when at logic low. The These power converters have been designed to be converter is on when the ON/OFF pin is left open. See stable with no external capacitors when used in low the Electrical Specifications for logic high/low inductance input and output circuits. definitions. In many applications, the inductance associated with The negative logic version turns on when the pin is at the distribution from the power source to the input of logic low and turns off when the pin is at logic high. the converter can affect the stability of the converter. The ON/OFF pin can be hard wired directly to Vin(-) to The addition of a 33 μF electrolytic capacitor with an enable automatic power up of the converter without the ESR <1 Ω across the input helps to ensure stability need of an external control signal. of the converter. In applications where decoupling The ON/OFF pin is internally pulled up to 5 VDC capacitance is distributed at the load, the power through a resistor. A properly de-bounced mechanical converter will exhibit stable operation with up to the switch, open-collector transistor, or FET can be used maximum admissible external load capacitance up to to drive the input of the ON/OFF pin. The device must 10,000 µF and ESR > 1mΩ. be capable of sinking up to 0.2 mA at a low level voltage of ≤ 0.8 V. An external voltage source (±20 V ON/OFF (Pin 2) maximum) may be connected directly to the ON/OFF The ON/OFF pin is used to turn the power converter input, in which case it must be capable of sourcing or on or off remotely via a system signal. There are two sinking up to 1 mA depending on the signal polarity. remote control options available, positive and See the Startup Information section for system timing negative logic, with both referenced to Vin(-). A waveforms associated with use of the ON/OFF pin. typical connection is shown in Fig. A. Remote Sense SQL 48 C onverter Vin ( +) Vout ( +) The remote sense feature of the converter (T op View) SENSE ( +) compensates for voltage drops occurring between the Rload ON/ OF F TRIM output pins of the converter and the load. The Vin SENSE ( - ) SENSE(-) (Pin 5) and SENSE(+) ( Pin 7) pins should Vin ( - ) Vout ( - ) be connected at the load or at the point where CONTROL INPUT regulation is required (see Fig. B). When using remote sense a minimum of 100uF ceramic capacitance Fig. A: Typ. Circuit configuration for ON/OFF function. should be mounted between Vout(+) and Vout(-) close to the pin 8 and pin 4. Rev 0.2, 3-Mar-11 www.power-one.com Page 4 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output The TRIM pin should be left open if trimming is not Rw SQL 48 C onverter Vout ( +) Vin ( +) being used. To minimize noise pickup, a 0.1 µF 100 (T op View) capacitor is connected internally between the TRIM SENSE ( +) ON/ OFF TRIM Rload and SENSE(-) pins. Vin SENSE ( - ) To increase the output voltage (Fig. C) a trim resistor, 10 Vin ( - ) Vout ( -) R , should be connected between the TRIM (Pin 6) T-INCR Rw and SENSE(+) (Pin 7), with a value of Fig. B: Remote sense circuit configuration. 5.11(100 + Δ)VO−NOM − 626 RT−INCR = − 10.22 1.225Δ [kΩ] Caution: where, If remote sensing is not utilized, the SENSE(-) pin R = Required value of trim-up resistor [kΩ] T-INCR must be connected to the Vout(-) pin, and the V = Nominal value of output voltage [V] O-NOM SENSE(+) pin must be connected to the Vout(+) pin to ensure the converter will regulate at the specified (VO-REQ − VO-NOM) Δ = X 100 output voltage. If these connections are not made, the VO -NOM converter will deliver an output voltage that is slightly [%] higher than the specified data sheet value. V = Desired (trimmed) output voltage [V]. O-REQ Because the sense leads carry minimal current, When trimming up, care must be taken not to exceed large traces on the end-user board are not required. However, sense traces should be run side by side the converter‘s maximum allowable output power. See the previous section for a complete discussion of this and located close to a ground plane to minimize system noise and ensure optimum performance. requirement. The converter’s output overvoltage protection (OVP) SQL 48 C onverter circuitry senses the voltage across Vout(+) and Vin ( +) Vout ( +) (T op View) Vout(-), and not across the sense lines, so the SENSE ( +) R T - INCR resistance (and resulting voltage drop) between the ON/ OF F TRIM Rload Vin output pins of the converter and the load should be SENSE ( - ) minimized to prevent unwanted triggering of the Vin ( - ) Vout ( - ) OVP. When utilizing the remote sense feature, care must Fig. C: Configuration for increasing output voltage. be taken not to exceed the maximum allowable output power capability of the converter, which is To decrease the output voltage (Fig. D), a trim resistor, equal to the product of the nominal output voltage R , should be connected between the TRIM (Pin T-DECR and the allowable output current for the given 6) and SENSE(-) (Pin 5), with a value of: conditions. 511 When using remote sense, the output voltage at the RT−DECR = − 10.22 converter can be increased by as much as 10% | Δ | [kΩ] above the nominal rating in order to maintain the where, required voltage across the load. Therefore, the R = Required value of trim-down resistor [kΩ] T-DECR designer must, if necessary, decrease the maximum and ∆ is defined above. current (originally obtained from the derating curves) Note: by the same percentage to ensure the converter’s The above equations for calculation of trim resistor values match actual output power remains at or below the those typically used in conventional industry-standard quarter-bricks, maximum allowable output power. eighth-bricks and sixteenth-brick models. Output Voltage Adjust / TRIM SQL 48 C onverter Vin ( +) Vout ( +) The output voltage can be adjusted up 10% or down (T op View) SENSE ( +) 20% relative to the rated output voltage by the ON/ OF F TRIM Rload addition of an externally connected resistor. For Vin R T -DE CR SENSE ( -) output voltage 3.3V, trim-up to 10% is guaranteed at Vin ≥ 40V, and to 8% at Vin ≥ 36V. Vin ( - ) Vout ( - ) Rev 0.2, 3-Mar-11 www.power-one.com Page 5 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Fig. D: Configuration for decreasing output voltage. Output Overvoltage Protection (OVP) Trimming/sensing beyond 110% of the rated output The converter will shut down if the output voltage voltage is not an acceptable design practice, as this across Vout(+) and Vout(-) exceeds the threshold of condition could cause unwanted triggering of the the OVP circuitry. The OVP circuitry contains its own output overvoltage protection (OVP) circuit. The reference, independent of the output voltage regulation designer should ensure that the difference between loop. Once the converter has shut down, it will attempt the voltages across the converter’s output pins and to restart every 200 ms until the OVP condition is its sense pins does not exceed 10% of VOUT(nom), removed. or: Overtemperature Protection (OTP) [VOUT(+) – VOUT(-)] – [VSENSE(+) – VSENSE(-)] < VO–NOM X 10% [V] The converter will shut down under an overtemperature condition to protect itself from This equation is applicable for any condition of overheating caused by operation outside the thermal output sensing and/or output trim. derating curves, or operation in abnormal conditions such as system fan failure. The converter will Protection Features automatically restart after it has cooled to a safe operating temperature. Input Undervoltage Lockout (UVLO) Safety Requirements Input undervoltage lockout is standard with this converter. The converter will shut down when the The converters are safety approved to UL/CSA60950- input voltage drops below a pre-determined voltage. 1, EN60950-1, and IEC60950-1. Basic Insulation is The input voltage must be typically 34V for the provided between input and output. converter to turn on. Once the converter has been The converters have no internal fuse. To comply with turned on, it will shut off when the input voltage safety agencies requirements, an input line fuse must drops typically below 32V. This feature is beneficial be used external to the converter. A 5-A fuse is in preventing deep discharging of batteries used in recommended for use with this product. telecom applications. The SQL converter is UL approved for a maximum Output Protections fuse rating of 15A. All output circuit protection features are non-latching Electromagnetic Compatibility (EMC) and operate in a “hiccup” mode. After an output EMC requirements must be met at the end-product protection event occurs, the converter will be turned system level, as no specific standards dedicated to off, and held off for approximately 200 ms after EMC characteristics of board mounted component dc- which, the protection circuit will reset and the dc converters exist. However, Power-One tests its converter will attempt to restart. If the fault is still converters to several system level standards, primary present, the converter will repeat the above action. of which is the more stringent EN55022, Information Once the fault is removed, the converter will start technology equipment - Radio disturbance normally. characteristics - Limits and methods of measurement. Output Overcurrent Protection (OCP) An effective internal LC differential filter significantly reduces input reflected ripple current, and improves The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent EMC. condition, the converter will shut down. With the addition of a simple external filter, the Once this occurs, it will enter hiccup mode and SQL48T20033 converter will pass the requirements of attempt to restart approximately every 200 ms with Class B conducted emissions per EN55022 and FCC an approximate duty cycle of 9% for overcurrent and requirements. Refer to Figures 17 – 18 for typical 3% for short circuit. The attempted restart will performance with external filter. continue indefinitely until the overload or short circuit condition is removed. Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and resumes normal operation Rev 0.2, 3-Mar-11 www.power-one.com Page 6 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Startup Information (using negative ON/OFF) V IN Scenario #1: Initial Startup From Bulk Supply ON/OFF function enabled, converter started via application of V . See Fig. E. IN Time Comments t ON/OFF pin is ON; system front-end power is 0 ON/OFF toggled on, V to converter begins to rise. IN STATE OFF t V crosses undervoltage Lockout protection 1 IN circuit threshold; converter enabled. t Converter begins to respond to turn-on 2 ON command (converter turn-on delay). V OUT t Converter V reaches 100% of nominal value. 3 OUT For this example, the total converter startup time (t - t ) is 3 1 typically 4 ms. t t 0 t 1 t 2 t 3 Scenario #2: Initial Startup Using ON/OFF Pin With V previously powered, converter started via IN ON/OFF pin. See Fig. F. Fig. E: Startup scenario #1. Time Comments t V at nominal value. 0 INPUT VI N t Arbitrary time when ON/OFF pin is enabled 1 (converter enabled). t End of converter turn-on delay. 2 t Converter V reaches 100% of nominal value. 3 OUT For this example, the total converter startup time (t - t ) is 3 1 typically 5 ms. ON/OFF STATE OFF Scenario #3: Turn-off and Restart Using ON/OFF Pin ON With V previously powered, converter is disabled and IN VO UT then enabled via ON/OFF pin. See Fig. G. Time Comments t V and V are at nominal values; ON/OFF pin 0 IN OUT ON. t t ON/OFF pin arbitrarily disabled; converter 0 1 2 3 1 t t t t output falls to zero; turn-on inhibit delay period (200 ms typical) is initiated, and ON/OFF pin Fig. F: Startup scenario #2. action is internally inhibited. t ON/OFF pin is externally re-enabled. 2 IN V If (t - t ) ≤ 200 ms, external action of 2 1 ON/OFF pin is locked out by startup inhibit timer. If (t - t ) > 200 ms, ON/OFF pin action is 2 1 internally enabled. 200 ms t Turn-on inhibit delay period ends. If ON/OFF pin ON/OFF 3 STATE is ON, converter begins turn-on; if off, converter OFF awaits ON/OFF pin ON signal; see Figure F. t End of converter turn-on delay. 4 ON t Converter V reaches 100% of nominal value. 5 OUT For the condition, (t - t ) ≤ 200 ms, the total converter 2 1 V OUT startup time (t - t ) is typically 205 ms. For (t - t ) > 200 ms, 5 1 2 1 startup will be typically 5 ms after release of ON/OFF pin. t 0 1 2 3 4 5 t t t t t t Fig. G: Startup scenario #3. Rev 0.2, 3-Mar-11 www.power-one.com Page 7 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Characterization temperature of 120°C as indicated by the thermal measurement, or General Information (ii) The output current at which the temperature at the The converter has been characterized for many thermocouple locations T do not exceed 120°C. (Fig. C operational aspects, to include thermal derating H) (maximum load current as a function of ambient (iii) The nominal rating of the converter (20A). temperature and airflow), efficiency, startup and shutdown parameters, output ripple and noise, transient response to load step-change, overcurrent, and short circuit. The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data are provided below. Test Conditions All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick Thermocouple (T ) B printed wiring board (PWB) with four layers. The top Thermocouples (T ) C Area and bottom layers were not metalized. The two inner layers, comprised of two-ounce copper, were used to Fig. H: Locations of the thermocouples for thermal testing. provide traces for connectivity to the converter. Thermal Derating – Baseplate w/ Coldplate The lack of metallization on the outer layers as well as the limited thermal connection ensured that heat The maximum load current rating vs. baseplate transfer from the converter to the PWB was temperature is provided in Figure 4. The baseplate minimized. This provides a worst-case but consistent temperature (T ) was maintained ≤ 105°C, with an B scenario for thermal derating purposes. airflow rate of ≤ 30LFM (≤ 0.15m/s) and ambient temperature ≤ 85°C. Thermocouple measurements (in All measurements requiring airflow were made in the Fig. H) were recorded with T ≤ 120°C. The user C vertical and/or horizontal wind tunnel using should design for T ≤ 105°C. B Infrared(IR) thermography and thermocouples for thermometry. Efficiency Ensuring components on the converter do not Efficiency vs. load current is showing in Figure 5 for exceed their ratings is important to maintaining high ambient temperature (T ) of 25ºC, airflow rate of A reliability. If one anticipates operating the converter 300LFM (1.5m/s) with vertical mounting and input at or close to the maximum loads specified in the voltages of 36V, 48V, 65V and 75V. Also, a plot of derating curves, it is prudent to check actual efficiency vs. load current, as a function of ambient operating temperatures in the application. temperature with Vin = 48V, airflow rate of 200 LFM (1 Thermographic imaging is preferable; if this m/s) with vertical mounting is shown in Figure. 6. capability is not available, then thermocouples may be used. The use of AWG #36 gauge thermocouples Power Dissipation is recommended to ensure measurement accuracy. Power dissipation vs. load current is showing in Figure Careful routing of the thermocouple leads will further =25ºC, airflow rate of 300LFM (1.5m/s) with 7 for T A minimize measurement error. Refer to Figure H for vertical mounting and input voltages of 36V, 48V, 65V the optimum measuring thermocouple location. and 75V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin Thermal Derating – Air Cooled = 48V, airflow rate of 200 LFM (1m/s) with vertical Load current vs. ambient temperature and airflow mounting is shown in Figure. 8. rates are given in Figures 1 - 3. Ambient temperature was varied between 25°C and 85°C, with airflow Startup rates from 30 to 500LFM (0.15 to 2.5m/s). Output voltage waveforms, during the turn-on transient For each set of conditions, the maximum load using the ON/OFF pin for full rated load currents current was defined as the lowest of: (resistive load) are shown with and without external (i) The output current at which any FET junction load capacitance in Figure 9 and Figure 10. temperature does not exceed a maximum Rev 0.2, 3-Mar-11 www.power-one.com Page 8 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Ripple and Noise i i C S Figure 13 shows the output voltage ripple waveform, 10 µ H measured at full rated load current with a 10µF 1 F µ source SQL 48 33 µ F Ceramic inductance tantalum and a 1µF ceramic capacitor across the Ω ESR < 1 10 µ F + DC - DC Vout output. Note that all output voltage waveforms are electrolytic Tantalum Converter V source capacitor Capacitor measured across the 1µF ceramic capacitor. The input reflected-ripple current waveforms are Fig. J: Test setup for measuring input reflected ripple obtained using the test setup shown in Fig. J. The currents, i and i . corresponding waveforms are shown in Figure 14, and c s Figure 15. 25 25 20 20 15 15 500 LFM (2.5 m/s) 500 LFM (2.5 m/s) 10 10 400 LFM (2.0 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 100 LFM (0.5 m/s) 5 5 30 LFM (0.15 m/s) 30 LFM (0.15 m/s) 0 0 20 30 40 50 60 70 80 90 20 30 40 50 60 70 80 90 Ambient Temperature [°C] Ambient Temperature [°C] Figure 1. Available load current vs. ambient air temperature Figure 3. Power derating of SQL48T20033 converter with and airflow rates for SQL48T20033 converter baseplate option and 0.91” tall horizontal-fin mounted vertically with air flowing from pin 3 to heatsink. (Conditions: same as Figure 1) pin 1, Tc temperatures ≤ 120 °C, Vin = 48 V. No thermal derating required. 25 25 20 20 15 15 500 LFM (2.5 m/s) 10 10 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 5 5 30 LFM (0.15 m/s) 0 0 20 30 40 50 60 70 80 90 100 110 20 30 40 50 60 70 80 90 Baseplate Temperature [°C] Ambient Temperature [°C] Figure 4. Coldplate cooling: Power derating of Figure 2. Power derating of SQL48T20033 converter with SQL48T20033-xxxBx converter with baseplate option baseplate option and 0.25” tall horizontal-fin and coldplate cooling. No thermal derating required. heatsink. (Conditions: same as Figure 1) (Conditions: Air velocity ≤ 30LFM (≤ 0.15m/s), Vin = 48 V, T ≤ 105°C) B Rev 0.2, 3-Mar-11 www.power-one.com Page 9 of 14 Load Current [Adc] Load Current [Adc] Load Current [Adc] Load Current [Adc] SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output 0.95 10 0.90 8 0.85 6 0.80 4 75 V 85 C 0.75 65 V 70 C 48 V 55C 2 36 V 40 C 0.70 0.65 0 0 4 8 12 16 20 24 0 4 8 12 16 20 24 Load Current [Adc] Load Current [Adc] Figure 5. Efficiency vs. load current and input voltage converter mounted vertically with air flowing from Figure 8. Power dissipation vs. load current and ambient temperature for converter mounted vertically with Vin pin 3 to pin 1 at 300 LFM (1.5 m/s) and T = 25°C. A = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). 0.95 0.90 0.85 0.80 85 C 70 C 55 C 0.75 40 C 0.70 0 4 8 12 16 20 24 Load Current [Adc] Figure 6. Efficiency vs. load current and ambient Figure 9. Turn-on waveform at full rated load current (resistive) temperature for converter mounted vertically with with 10,000 uF output capacitor at Vin=48V, triggered Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). via ON/OFF pin. Top trace: ON/OFF signal (5V/div.). Bottom trace: Output voltage (1V/div.). Time scale: 2 ms/div. 10 8 6 4 75V 65 V 48 V 2 36 V 0 0 4 8 12 16 20 24 Load Current [Adc] Figure 7. Power dissipation vs. load current and input voltage converter mounted vertically with air Figure 10. Turn-on waveform at full rated load current (resistive) flowing from pin 3 to pin 1 at 300 LFM (1.5 m/s) and with 10uF tant. + 1uF cer. output capacitor at T = 25°C. Vin=48V, triggered via ON/OFF pin. Top trace: A ON/OFF signal (5V/div.). Bottom trace: Output voltage (1V/div.). Time scale: 2 ms/div. Rev 0.2, 3-Mar-11 www.power-one.com Page 10 of 14 Efficiency Efficiency Power Dissipation [W] Power Dissipation [W] SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Figure 11. Output voltage response to load current step Figure 14. Input reflected-ripple current, i (10 mA/div.), s change (10A – 15A – 10A) at Vin = 48 V. measured through 10 µH at the source at full rated Top trace: output voltage (50mV/div.) load current and Vin = 48 V. Refer to Fig. J for test Bottom: load current (5 A/div.). setup. Time scale: 1 µs/div. Current slew rate: 0.1 A/µs. Time scale: 200 µs /div. Co = 10µF tantalum + 1µF ceramic Figure 12. Output voltage response to load current step Figure 15. Input reflected ripple-current, i (100 mA/div.), c change (10A – 15A – 10A) at Vin = 48 V. measured at input terminals at full rated load Top trace: output voltage (50mV/div.) current and Vin = 48 V. Refer to Fig. J for test setup. Bottom: load current (5 A/div.). Time scale: 1 µs/div. Current slew rate: 1 A/µs. Time scale: 200 µs /div. Co = 470µF POS + 1µF ceramic Figure 13. Output voltage ripple (20 mV/div.) at full rated Figure 16. Load current (top trace, 20 A/div., 100 ms/div.) into load current into a resistive load with Co = 10µF a 10 mΩ short circuit during restart, at tantalum + 1µF ceramic and Vin = 48V. Time Vin = 48 V. Bottom trace (20 A/div., 5 ms/div.) is an scale: 1µs/div. expansion of the on-time portion of the top trace. Rev 0.2, 3-Mar-11 www.power-one.com Page 11 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Comp. Description Des. C1 3 x 1uF, 100V Ceramic Capacitor C3 33uF, 100V Electrolytic Capacitor L1 F4810 Power-One Input Filter C4, C5 2200pF Ceramic Capacitor C2 Not Assembled Figure 17. Typical input EMI filter circuit to attenuate conducted emissions. Figure 18. Input conducted emissions measurement (Typ.) of SQL48T20033. Conditions: V = 48VDC, I = 20AMPS IN OUT Rev 0.2, 3-Mar-11 www.power-one.com Page 12 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Physical Information SQL48T Pinout (Through-hole) PINS 1,2,3,5,6,7 Ø 0.040±0.002 [Ø 1.02±0.05] 0.150 [3.81] 4X ±0.010 ±0.25 WITH Ø 0.076 [1.93] SHOULDER 2.300 [58.42 ] 2.000 [50.80] Pad/Pin Connections 1 8 Pad/Pin # Function 0.896±0.010 [22.76±0.25] 7 1 V (+) IN 2 TOP VIEW 6 5 0.300 [7.62] 2X 2 ON/OFF 3 4 3 V (-) IN 0.148±0.010 [3.76±0.25] PINS 4,8 Ø 0.062±0.002 [Ø 1.57±0.05] 4 V (-) OUT ±0.010 ±0.25 0.145 [3.68 ] WITH Ø 0.096 [2.44] SHOULDER 5 SENSE(-) 6 TRIM SIDE VIEW 7 SENSE(+) NO HEAT SPREADER 8 VOUT (+) CL HT (-xDx0x) SQL48T Platform Notes • All dimensions are in inches [mm] PL CUSTOMER PCB • Pins 1-3, 5-7 are Ø 0.040” [1.02] with Ø 0.076” [1.93] shoulder SIDE VIEW • Pins 4 and 8 are Ø 0.062” [1.57] WITH HEAT SPREADER with are Ø 0.096” [2.44] shoulder • Pin Material: Brass Alloy 360 HT(-xDxBx) CL • Pin Finish: Tin over Nickel PL CUSTOMER PCB Minimum Pin Length Height Special Pin Clearance [PL] [HT] Features Option [CL] ±0.005” [±0.13] 0.375” [9.53] 0.040” 0 A 0.188” [4.78] max [1.02] D 0.500”+/-0.020 0.040” B B 0.145” [3.68] [12.70+/-0.51] [1.02] Heat Spreader Interface Information DEPTH NOTE: SCREW LENGTH MUST BE SELECTED TO LIMIT HEAT SPREADER PENETRATION TO 0.12 [3.0] 2.300±0.010 [58.42±0.25] M3 X .5 2X 2.000 [50.80] SEE DEPTH NOTE PIN 1 INDICATOR ±0.010 ±0.25 0.896 [22.76 ] 0.600 [15.24] TOP VIEW 0.148±0.010 [3.76±0.25] ±0.010 ±0.25 0.150 [3.81 ] Rev 0.2, 3-Mar-11 www.power-one.com Page 13 of 14 SQL48T20033 DC-DC Converter Data Sheet 36-75 VDC Input; 3.3 VDC @ 20A Output Converter Part Numbering/Ordering Information Maximum Pin Product Input Mounting Rated Output ON/OFF Height Length Special Features RoHS Series Voltage Scheme Current Voltage Logic [HT] [PL] SQL 48 T 20 033 - N D A B G No Suffix ⇒ RoHS D ⇒ Through lead- 0 ⇒ 2250VDC hole N ⇒ solder- isolation 0.375” One- Negative exemption T ⇒ for -xxx0x Eighth 20 ⇒ 033 ⇒ A ⇒ compliant 36-75 V Through- Brick 0.188” 20 ADC 3.3V hole B ⇒ Baseplate Format P ⇒ 0.520” option + ‘0’ Positive B ⇒ for -xxxBx G ⇒ RoHS above 0.145” compliant for all six substances The example above describes P/N SQL48T20033-NDABG: 36-75V input, through-hole, 20A@3.3V output, negative ON/OFF logic, maximum height of 0.52”, 0.188” pin length, 2250VDC isolation, integral heat spreader (Baseplate) and RoHS compliant for all 6 substances. Consult factory for availability of other options. Notes: 1. NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of Power-One, Inc. 2. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. Rev 0.2, 3-Mar-11 www.power-one.com Page 14 of 14