SQE48T30033-PGB0

The high temperature 30A SQE48 Series of DC-DC converters provides a high efficiency single output, in a 1/8th brick package that is only 62% the size of the industry-standard quarter-brick. Specifically designed for operation in systems that have limited airflow and increased ambient temperatures, the SQE48T30 converters utilize the same pinout and functionality of the industrystandard quarter-bricks. The 30 A SQE48 Series converters provide thermal performance in high temperature environments that exceeds most competitors' 30A quarter-bricks. This performance is accomplished through the use of patented/patent-pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal management, and a low-body profile.                     RoHS lead-free solder and lead-solder-exempted products are available Delivers up to 30 A Industry-standard quarter-brick pinout Outputs available: 3.3, 2.5, 1.8, 1.5, and 1.2 VDC On-board input differential LC-filter Startup into pre-biased load No minimum load required Weight: 0.72 oz [20.6 g] Meets Basic Insulation requirements of EN60950 Withstands 100 V input transient for 100 ms Fixed-frequency operation Fully protected Remote output sense Positive or negative logic ON/OFF option Latching and non-latching protection available Output voltage trim range: +10%/−20% with industry-standard trim equations (except 1.2 Vout) High reliability: MTBF = 15.75 million hours, calculated per Telcordia TR-332, Method I Case 1 UL60950 recognized in US and Canada and certified per IEC/EN60950 Designed to meet Class B conducted emissions per FCC and EN55022 when used with external filter All materials meet UL94, V-0 flammability rating 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 36-75 V input, the SQE48T30 converters provide any standard output voltage from 3.3 V down to 1.2 V that can be trimmed from –20% to +10% of the nominal output voltage (± 10% for output voltage 1.2 V), thus providing outstanding design flexibility. With standard pinout and trim equations, the SQE48 Series converters are perfect drop-in replacements for existing 30 A 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 SQE48 Series’ optimized thermal efficiency.     Telecommunications Data Communications Wireless Communications Servers, workstations   High efficiency – no heat sink required Higher current capability at elevated temperatures than competitors’ 30 A quarter-bricks Industry standard 1/8th brick footprint: 0.896” x 2.30” (2.06 in2), 38% smaller than conventional quarter-bricks  North America +1-866.513.2839 Asia-Pacific +86.755.29885888 Europe, Middle East +353 61 225 977 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Conditions: TA = 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µ F, unless otherwise specified. PARAMETER Notes MIN TYP MAX UNITS Absolute Maximum Ratings Input Voltage 0 80 VDC Operating Ambient Temperature Continuous -40 85 °C Storage Temperature -55 125 °C Isolation Characteristics I/O Isolation 2250 Isolation Capacitance VDC 200 Isolation Resistance pF 10 MΩ Feature Characteristics Switching Frequency Output Voltage Trim Range1 Remote Sense Compensation1 Output Overvoltage Protection 440 kHz Industry-std. equations (3.3 – 1.5 V) -20 +10 % Use trim equation on Page 6 (1.2 V) -10 +10 % Percent of VOUT(NOM) +10 % Latching or Non-latching ( 3.3 – 1.8 V) 117 122 130 % Latching or Non-latching (1.5 -1.2 V) 122 128 140 % 125 °C Peak amplitude 1 ADC Peak duration 50 μs Converter Off; external voltage 5 VDC 10 Auto-Restart Period Applies to all protection features 200 ms Turn-On Time See Figs. E, F, and G 3 ms Overtemperature Shutdown (PCB) Non-latching Peak Back-drive Output Current (Sinking current from external source) during startup into prebiased output Back-drive Output Current (Sinking Current from external source) 30 mADC ON/OFF Control (Positive Logic) Converter Off (logic low) -20 0.8 VDC Converter On (logic high) 2.4 20 VDC Converter Off (logic high) 2.4 20 VDC Converter On (logic low) -20 0.8 VDC ON/OFF Control (Negative Logic) Input Characteristics Operating Input Voltage Range 36 48 75 VDC 33 34 35 VDC 31 32 Input Undervoltage Lockout Turn-on Threshold Turn-off Threshold 33 VDC 100 VDC VOUT = 3.3 VDC 3.1 ADC VOUT = 2.5 VDC 2.4 ADC VOUT = 1.8 VDC 1.7 ADC VOUT = 1.5 VDC 1.5 ADC VOUT = 1.2 VDC 1.2 ADC Input Voltage Transient 100 ms Maximum Input Current 30 ADC Out @ 36 VDC In Input Stand-by Current Vin = 48V, converter disabled 2 mA 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Input No Load Current (0 load on the output) Input Reflected-Ripple Current, is Input Voltage Ripple Rejection Vin = 48V, converter enabled VOUT = 3.3 VDC 42 mA VOUT = 2.5 VDC 34 mA VOUT = 1.8 VDC 30 mA VOUT = 1.5 VDC 28 mA VOUT = 1.2 VDC 27 mA VOUT = 3.3 VDC 8 mAPK-PK VOUT = 2.5 VDC 6 mAPK-PK VOUT = 1.8 VDC 6 mAPK-PK VOUT = 1.5 VDC 6 mAPK-PK VOUT = 1.2 VDC 6 mAPK-PK VOUT = 3.3 VDC 91 dB VOUT = 2.5 VDC 60 dB VOUT = 1.8 VDC 70 dB VOUT = 1.5 VDC 65 dB VOUT = 1.2 VDC 65 dB Vin = 48V, 25 MHz bandwidth 120 Hz Output Characteristics External Load Capacitance Plus full load (resistive) Output Current Range 0 Current Limit Inception Non-latching Peak Short-Circuit Current Non-latching, Short = 10 mΩ RMS Short-Circuit Current Non-latching 31.5 36.5 6 Output Voltage Set Point (no load)2 30,000 μF 30 ADC 42 ADC 46 A 8 Arms +1 %Vout ±2 ±5 mV ±2 ±5 mV +1.5 %Vout -1 Output Regulation Over Line Over Line Over Load Output Voltage Range Output Ripple and Noise – 25 MHz bandwidth Over line, load and temperature2 -1.5 Full load + 10 μF tantalum + 1 μF ceramic VOUT = 3.3 VDC 40 75 mVPK-PK VOUT = 2.5 VDC 35 60 mVPK-PK VOUT = 1.8 VDC 30 50 mVPK-PK VOUT = 1.5 VDC 25 45 mVPK-PK VOUT = 1.2 VDC 20 40 mVPK-PK Co = 1 μF ceramic (Fig. 3.3V.9) 303 mV Co = 1 μF ceramic (Fig. 3.3V.9) 150 mV 15 μs VOUT = 3.3 VDC 90.5 % VOUT = 2.5 VDC 89.0 % VOUT = 1.8 VDC 86.5 % Dynamic Response Load Change 10A-20A-10A di/dt = 0.1 A/μs di/dt = 5 A/μs Settling Time to 1% of Vout Efficiency 100% Load 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA 50% Load VOUT = 1.5 VDC 85.0 % VOUT = 1.2 VDC 83.0 % VOUT = 3.3 VDC 92.0 % VOUT = 2.5 VDC 90.5 % VOUT = 1.8 VDC 88.5 % VOUT = 1.5 VDC 87.0 % VOUT = 1.2 VDC 85.0 % Additional Notes: 1Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim from all sources should not exceed 10% of V (NOM), in order to ensure specified operation of overvoltage protection circuitry. OUT 2Operating 3See ambient temperature range of -40 º C to 85 º C for converter. waveforms for dynamic response and settling time for different output voltages These power converters have been designed to be stable with no external capacitors when used in low inductance input and output circuits. In many applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. The addition of a 33 μF electrolytic capacitor with an ESR < 1 Ω across the input helps to ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable operation with external load capacitance up to 30,000 μF on 3.3 to 1.2 V outputs. Additionally, see the EMC section of this data sheet for discussion of other external components which may be required for control of conducted emissions. The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control options available, positive logic and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. A. Fig. A: Circuit configuration for ON/OFF function The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when at a logic low. The converter is on when the ON/OFF pin is left open. See the Electrical Specifications for logic high/low definitions. The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF pin can be hard wired directly to Vin(-) to enable automatic power up of the converter without the need of an external control signal. The ON/OFF pin is internally pulled up to 5 V through a resistor. A properly de-bounced mechanical switch, open-collector transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at a low level voltage of ≤ 0.8 V. An external voltage source (± 20 V maximum) may be connected directly to the ON/OFF input, in which case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Startup Information section for system timing waveforms associated with use of the ON/OFF pin. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point where regulation is required (see Fig. B). Fig. B: Remote sense circuit configuration CAUTION If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must be connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified data sheet value. Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance. The converter’s output overvoltage protection (OVP) senses the voltage across Vout(+) and Vout(-), and not across the sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent unwanted triggering of the OVP. When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given conditions. When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter’s actual output power remains at or below the maximum allowable output power. The output voltage can be adjusted up 10% or down 20% for Vout ≥ 1.5 V, and 10% for Vout = 1.2 V relative to the rated output voltage by the addition of an externally connected resistor. For output voltage 3.3 V, trim up to 10% is guaranteed only at Vin ≥ 40 V, and it is marginal (8% to 10%) at Vin = 36 V. The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 μF capacitor is connected internally between the TRIM and SENSE(-) pins. To increase the output voltage, refer to Fig. C. A trim resistor, RT-INCR, should be connected between the TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of: RTINCR  5.11(100 Δ)V ONOM  626  10.22 1.225Δ [k], for 3.3 – 1.5 V. [kΩ] (1.2 V) where, RTINCR  Required value of trim-up resistor k] VONOM  Nominal value of output voltage [V] 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Δ (VO-REQ  VO-NOM ) X 100 VO -NOM [%] VOREQ  Desired (trimmed) output voltage [V]. When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See the previous section for a complete discussion of this requirement. Fig. C: Configuration for increasing output voltage To decrease the output voltage (Fig. D), a trim resistor, R , should be connected between the TRIM (Pin 6) and T-DECR SENSE(-) (Pin 5), with a value of: where, RTDECR  Required value of trim-down resistor [kΩ] and Δ is defined above. Note: The above equations for calculation of trim resistor values match those typically used in conventional industry-standard quarter-bricks (except for 1.2 V outputs). Converters with output voltages 1.2 V is available with alternative trim feature to provide the customers with the flexibility of second sourcing has a character “T” in the part number. The trim equations of “T” version of converters and more information can be found in Application Note for Output Voltage Trim Function Operation. Fig. D: Configuration for decreasing output voltage Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause unwanted triggering of the output overvoltage protection (OVP) circuit. The designer should ensure that the difference between the voltages across the converter’s output pins and its sense pins does not exceed 10% of V OUT(NOM), or: [VOUT()  VOUT()]  [VSENSE()  VSENSE()]  VO - NOM X 10% [V] This equation is applicable for any condition of output sensing and/or output trim. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a pre-determined voltage. The input voltage must be typically 34 V for the converter to turn on. Once the converter has been turned on, it will shut off when the input voltage drops typically below 32 V. This feature is beneficial in preventing deep discharging of batteries used in telecom applications. The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the converter will switch to constant current operation and thereby begin to reduce output voltage. When the output voltage drops below 60% of the nominal value of output voltage, the converter will shut down (Fig x.15). Once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3-5% duty cycle (Fig. x.16). The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 40-50% of its nominal value. Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and continues normal operation. For implementations where latching is required, a “Latching” option (L) is available for short circuit and OVP protections. Converters with the latching feature will latch off if either event occurs. The converter will attempt to restart after either the input voltage is removed and reapplied OR the ON/OFF pin is cycled. The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the OVP circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter has shut down, it will attempt to restart every 200 ms until the OVP condition is removed. For implementations where latching is required, a “Latching” option (L) is available for short circuit and OVP protections. Converters with the latching feature will latch off if either event occurs. The converter will attempt to restart after either the input voltage is removed and reapplied OR the ON/OFF pin is cycled. The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. The converter with the non-latching option will automatically restart after it has cooled to a safe operating temperature. The converters meet North American and International safety regulatory requirements per UL60950 and EN60950. Basic Insulation is provided between input and output. To comply with safety agencies’ requirements, an input line fuse must be used external to the converter. The Table below provides the recommended fuse rating for use with this family of products. Output Voltage 3.3 V 2.5 V 1.8 V, 1.5 V 1.2 V Fuse Rating 5A 4A 3A 2.5 A All SQ converters are UL approved for a maximum fuse rating of 15 A. To protect a group of converters with a single fuse, the rating can be increased from the recommended values above. EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics of board mounted component dc-dc converters exist. However, Bel Power Solutions tests its converters to several system level standards, primary of which is the more stringent EN55022, Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC. With the addition of a simple external filter, all versions of the SQE48-Series of converters pass the requirements of Class B conducted emissions per EN55022 and FCC requirements. Contact Bel Power Solutions Applications Engineering for details of this testing. Startup Information (using negative ON/OFF) Fig. E: Startup scenario #1 Scenario #1: Initial Startup From Bulk Supply ON/OFF function enabled, converter started via application of VIN. See Figure E. Time t0 Comments ON/OFF pin is ON; system front-end power is toggled on, VIN to converter begins to rise. t1 VIN crosses undervoltage Lockout protection circuit threshold; converter enabled. t2 Converter begins to respond to turn-on command (converter turn-on delay). t3 Converter VOUT reaches 100% of nominal value. For this example, the total converter startup time (t3- t1) is typically 3 ms. Fig. F: Startup scenario #2 Scenario #2: Initial Startup Using ON/OFF Pin With VIN previously powered, converter started via ON/OFF pin. See Figure F. Time t0 t1 Comments VINPUT at nominal value. Arbitrary time when ON/OFF pin is enabled (converter enabled). t2 End of converter turn-on delay. t3 Converter VOUT reaches 100% of nominal value. For this example, the total converter startup time (t3- t1) is typically 3 ms. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. G: Startup scenario #3 Scenario #3: Turn-off and Restart Using ON/OFF Pin With VIN previously powered, converter is disabled and then enabled via ON/OFF pin. See Figure G. Time t0 t1 Comments VIN and VOUT are at nominal values; ON/OFF pin ON. ON/OFF pin arbitrarily disabled; converter output falls to zero; turn-on inhibit delay period (100 ms typical) is initiated, and ON/OFF pin action is internally inhibited. t2 ON/OFF pin is externally re-enabled. If (t2- t1) ≤ 200 ms, external action of ON/OFF pin is locked out by startup inhibit timer. If (t2- t1) > 200 ms, ON/OFF pin action is internally enabled. t3 Turn-on inhibit delay period ends. If ON/OFF pin is ON, converter begins turn-on; if off, converter awaits ON/OFF pin ON signal; see Figure F. t4 End of converter turn-on delay. t5 Converter VOUT reaches 100% of nominal value. For the condition, (t2- t1) ≤ 200 ms, the total converter startup time (t5- t2) is typically 203 ms. For (t2- t1) > 200 ms, startup will be typically 3 ms after release of ON/OFF pin. The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, startup and shutdown parameters, output ripple and noise, transient response to load step-change, overload, and short circuit. All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick printed wiring board (PWB) with four layers. The top and bottom layers were not metalized. The two inner layers, comprised of two-ounce copper, were used to provide traces for connectivity to the converter. The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes. All measurements requiring airflow were made in the vertical and horizontal wind tunnel using Infrared (IR) thermography and thermocouples for thermometry. Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. The use of AWG #40 gauge thermocouples is recommended to ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Fig. H for the optimum measuring thermocouple locations. Load current vs. ambient temperature and airflow rates are given in Fig. x.1 and Fig. x.2 for vertical and horizontal converter mounting. Ambient temperature was varied between 25 ° C and 85 ° C, with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s). For each set of conditions, the maximum load current was defined as the lowest of: (i) The output current at which any FET junction temperature does not exceed a maximum specified temperature of 120 ° C as indicated by the thermographic image, or (ii) The temperature of the transformer does not exceed 120 ° C, or (iii) The nominal rating of the converter (30 A on 3.3 to 1.2 V). 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA During normal operation, derating curves with maximum FET temperature less or equal to 120 ° C should not be exceeded. Temperature at both thermocouple locations shown in Fig. H should not exceed 120 ° C in order to operate inside the derating curves. Fig. H: Locations of the thermocouple for thermal testing Fig. x.3 shows the efficiency vs. load current plot for ambient temperature of 25 º C, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36 V, 48 V, and 72 V. Also, a plot of efficiency vs. load current, as a function of ambient temperature with Vin = 48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. x.4. Fig. x.5 shows the power dissipation vs. load current plot for Ta = 25 º C, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36 V, 48 V, and 72 V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin = 48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. x.6. Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are shown without and with external load capacitance in Figs. x.7-8, respectively. Fig. x.11 show the output voltage ripple waveform, measured at full rated load current with a 10 μF tantalum and 1 μF ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 μF ceramic capacitor. The input reflected-ripple current waveforms are obtained using the test setup shown in Fig x.12. The corresponding waveforms are shown in Figs. x.13-14. Fig. 3.3V.1: Available load current vs. ambient air temperature and airflow rates for SQE48T30033 converter mounted vertically with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120 ° C, Vin = 48 V. Fig. 3.3V.2: Available load current vs. ambient air temperature and airflow rates for SQE48T30033 converter mounted horizontally with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120 ° C, Vin = 48 V. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Note: NC – Natural convection Fig. 3.3V.3: Efficiency vs. load current and input voltage for SQE48T30033 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 3.3V.4: Efficiency vs. load current and ambient temperature for SQE48T30033 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Fig. 3.3V.5: Power dissipation vs. load current and input voltage for SQE48T30033 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 3.3V.6: Power dissipation vs. load current and ambient temperature for SQE48T30033 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Fig. 3.3V.7: Turn-on transient at full rated load current (resistive) with no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 1 ms/div. Fig. 3.3V.8: Turn-on transient at full rated load current (resistive) plus 10,000 μF at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 1 ms/div. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 3.3V.9: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 0.1 A/μs. Co = 1 μF ceramic Time scale: 0.2 ms/div. Fig. 3.3V.10: Output voltage response to load current step-change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 5 A/μs. Co = 470 μF POS + 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 3.3V.11: Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 μF tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.. Fig. 3.3V.12: Test setup for measuring input reflected ripple currents, ic and is Fig. 3.3V.13: Input reflected-ripple current, c (50 mA/div.), measured at input terminals at full rated load current and Vin = 48 V. Refer to Fig. 3.3V.12 for test setup. Time scale: 1 μs/div. Fig. 3.3V.14: Input reflected-ripple current, s (10 mA/div.), measured through 10 μH at the source at full rated load current and Vin = 48 V. Refer to Fig. 3.3V.12 for test setup. Time scale: 1 μs/div 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 3.3V.15: Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Fig. 3.3V.16: Load current (top trace, 20 A/div., 50 ms/div.) into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an expansion of the on-time portion of the top trace. Fig. 2.5V.1: Available load current vs. ambient air temperature and airflow rates for SQE48T30025 converter mounted vertically with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120 Fig. 2.5V.2: Available load current vs. ambient air temperature and airflow rates for SQE48T30025 converter mounted horizontally with air flowing from pin 3 to pin 1, MOSFET ° C, Vin = 48 V. temperature ≤ 120 ° C, Vin = 48 V. Note: NC – Natural convection Fig. 2.5V.3: Efficiency vs. load current and input voltage for SQE48T30025 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 2.5V.4: Efficiency vs. load current and ambient temperature for SQE48T30025 converter mounted vertically with Vin = 48 V pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 2.5V.5: Power dissipation vs. load current and input voltage for SQE48T30025 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25° C. Fig. 2.5V.7: Turn-on transient at full rated load current (resistive) with no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 2.5V.9: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 0.1 A/μs. Co = 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 2.5V.6: Power dissipation vs. load current and ambient temperature for SQE48T30025 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Fig. 2.5V.8: Turn-on transient at full rated load current (resistive) plus 10,000 μF at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 2.5V.10: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 5A/μs.Co = 470 μF POS + 1 μF ceramic. Time scale: 0.2 ms/div. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 2.5V.11: Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 μF tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div. Fig. 2.5V.12: Test setup for measuring input reflected ripple currents, ic and is. Fig. 2.5V.13: Input reflected-ripple current, c (100 mA/div.), measured at input terminals at full rated load current and Vin = 48 V. Refer to Fig. 2.5V.12 for test setup. Time scale: 1 μs/div. 1μs/div. Fig. 2.5V.14: Input reflected-ripple current, s (10 mA/div.), measured through 10 μH at the source at full rated load current and Vin = 48 V. Refer to Fig. 2.5V.12 for test setup. Time scale: Fig. 2.5V.15: Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Fig. 2.5V.16: Load current (top trace, 20 A/div., 50 ms/div.) into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an expansion of the on-time portion of the top trace. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.8V.1: Available load current vs. ambient air temperature and airflow rates for SQE48T30018 converter mounted vertically with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120 Fig. 1.8V.2: Available load current vs. ambient air temperature and airflow rates for SQE48T30018 converter mounted horizontally with air flowing from pin 3 to pin 1, MOSFET ° C, Vin = 48 V. temperature ≤ 120 ° C, Vin = 48 V. Note: NC – Natural convection Fig. 1.8V.3: Efficiency vs. load current and input voltage for SQE48T30018 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 1.8V.4: Efficiency vs. load current and ambient temperature for SQE48T30018 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Fig. 1.8V.5: Power dissipation vs. load current and input voltage for SQE48T30018 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 1.8V.6: Power dissipation vs. load current and ambient temperature for SQE48T30018 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s) 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.8V.7: Turn-on transient at full rated load current (resistive) with no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 1.8V.9: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 0.1 A/μs. Co = 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 1.8V.11: Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 μF tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div. Fig. 1.8V.8: Turn-on transient at full rated load current (resistive) plus 10,000 μF at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 1.8V.10: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 5 A/μs. Co = 470 μF POS + 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 1.8V.12: Test setup for measuring input reflected ripple currents, ic and is 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.8V.13: Input reflected-ripple current, c (100 mA/div.), measured at input terminals at full rated load current and Vin = 48 V. Refer to Fig. 1.8V.12 for test setup. Time scale: 1 μs/div. Fig. 1.8V.15: Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Fig. 1.8V.14: Input reflected-ripple current, s (10 mA/div.), measured through 10 μH at the source at full rated load current and Vin = 48 V. Refer to Fig. 1.8V.12 for test setup. Time scale: 1 μs/div Fig. 1.8V.16: Load current (top trace, 20 A/div., 50 ms/div.) into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an expansion of the on-time portion of the top trace. Fig. 1.5V.1: Available load current vs. ambient air temperature and airflow rates for SQE48T30015 converter mounted vertically with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120 Fig. 1.5V.2: Available load current vs. ambient air temperature and airflow rates for SQE48T30015 converter mounted horizontally with air flowing from pin 3 to pin 1, MOSFET ° C, Vin = 48 V. temperature ≤ 120 ° C, Vin = 48 V. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Note: NC – Natural convection Fig. 1.5V.3: Efficiency vs. load current and input voltage for SQE48T30015 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 1.5V.5: Power dissipation vs. load current and input voltage for SQE48T30015 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 1.5V.7: Turn-on transient at full rated load current (resistive) with no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 1.5V.4: Efficiency vs. load current and ambient temperature for SQE48T30015 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Fig. 1.5V.6: Power dissipation vs. load current and ambient temperature for SQE48T30015 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s) Fig. 1.5V.8: Turn-on transient at full rated load current (resistive) plus 10,000 μF at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.5V.9: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 0.1 A/μs. Co = 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 1.5V.11: Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 μF tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div. Fig. 1.5V.13: Input reflected ripple-current, c (100 mA/div.), measured at input terminals at full rated load current and Vin = 48 V. Refer to Fig. 1.5V.12 for test setup. Time scale: 1 μs/div. Fig. 1.5V.10: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 5A/μs. Co = 470 μF POS + 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 1.5V.12: Test setup for measuring input reflected ripple currents, ic and is Fig. 1.5V.14: Input reflected-ripple current, s (10 mA/div.), measured through 10 μH at the source at full rated load current and Vin = 48 V. Refer to Fig. 1.5V.12 for test setup. Time scale: 1 μs/div 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.5V.15: Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Fig. 1.5V.16: Load current (top trace, 20 A/div., 50 ms/div.) into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an expansion of the on-time portion of the top trace. Fig. 1.2V.1: Available load current vs. ambient air temperature and airflow rates for SQE48T30012 converter mounted vertically with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120 Fig. 1.2V.2: Available load current vs. ambient air temperature and airflow rates for SQE48T30012 converter mounted horizontally with air flowing from pin 3 to pin 1, MOSFET ° C, Vin = 48 V. temperature ≤ 120 ° C, Vin = 48 V. Note: NC – Natural convection Fig. 1.2V.3: Efficiency vs. load current and input voltage for SQE48T30012 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 ° C. Fig. 1.2V.4: Efficiency vs. load current and ambient temperature for SQE48T30012 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.2V.5: Power dissipation vs. load current and input voltage for SQE48T30012 converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25° C. Fig. 1.2V.7: Turn-on transient at full rated load current (resistive) with no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 1.2V.9: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 0.1 A/μs. Co = 1 μF ceramic. Time scale: 0.2 ms/div. Fig. 1.2V.6: Power dissipation vs. load current and ambient temperature for SQE48T30012 converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Fig. 1.2V.8: Turn-on transient at full rated load current (resistive) plus 10,000 μF at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage (1 V/div.). Time scale: 2 ms/div. Fig. 1.2V.10: Output voltage response to load current stepchange (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). (10 A/div.). Current slew rate: 0.1 A/μs. Co = 1 μF ceramic. Time scale: 0.2 ms/div. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Fig. 1.2V.11: Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 μF tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div. Fig. 1.2V.13: Input reflected ripple-current, c (100 mA/div.), measured at input terminals at full rated load current and Vin = 48 V. Refer to Fig. 1.2V.12 for test setup. Time scale: 1 μs/div. Fig. 1.2V.15: Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Fig. 1.2V.11: Output voltage ripple (20 mV/div.) at full rated currents, ic and is Fig. 1.2V.14: Input reflected-ripple current, s (10 mA/div.), measured through 10 μH at the source at full rated load current and Vin = 48 V. Refer to Fig. 1.2V.12 for test setup. Time scale: 1 μs/div. Fig. 1.2V.16: Load current (top trace, 20 A/div., 50 ms/div.) into a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div., 5 ms/div.) is an expansion of the on-time portion of the top trace. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA HT (Max. Height) CL (Min. Clearance) D +0.000 [+0.00] -0.038 [- 0.97] 0.374 [9.5] +0.016 [+0.41] -0.000 [- 0.00] 0.035 [0.89] G 0.407 [10.34] 0.035 [0.89] Height Option PL Pin Length Pin Option ± 0.005 [± 0.13] A 0.188 [4.78] B 0.145 [3.68] C 0.110 [2.79] Pad/Pin Connections Pad/Pin # Function 1 Vin (+) 2 ON/OFF 3 Vin (-) 4 Vout (-) 5 SENSE(-) 6 TRIM 7 SENSE(+) 8 Vout (+) SQE48T Platform Notes      All dimensions are in inches [mm] Pins 1-3 and 5-7 are Ø 0.040” [1.02] with Ø 0.078” [1.98] shoulder Pins 4 and 8 are Ø 0.062” [1.57] without shoulder Pin Material & Finish: Brass Alloy 360 with Matte Tin over Nickel Converter Weight: 0.72 oz [20.6 g] 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA Product Input Series1 Voltage SQE 48 Mounting Scheme Rated Load Current Output Voltage T 30 033 - ON/OFF Logic Maximum Height [HT] Pin Length [PL] N G B Special Features 0 0 ⇒ STD OneEighth Brick Format 36-75 V T Throughhole 30 ADC 012 ⇒ 1.2 V 015 ⇒ 1.5 V 018 ⇒ 1.8 V 025 ⇒ 2.5 V 033 ⇒ 3.3 V N Negative P Positive D2⇒ 0.374” G ⇒ 0.407” A ⇒ 0.188” B ⇒ 0.145” C ⇒ 0.110” RoHS L⇒ Latching Option T⇒ Alternative Trim Option (1.2 V only) No Suffix  RoHS lead-solderexemption compliant G  RoHS compliant for all six substances The example above describes p/n SQE48T30033-NGB0: 36-75V input, through-hole, 30A @ 3.3 V output, negative ON/OFF logic, a 0.145” pin length, maximum height of 0.407”, standard (non-latching) protection, and RoHS lead-solder-exemption compliance. 1All possible option combinations are not necessarily available for every model. Contact Customer Service to confirm availability. Height option D is only available on model SQE48T30033-NDA0. 2Maximum NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. 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. 866.513.2839 tech.support@psbel.com belpowersolutions.com © 2015 Bel Power Solutions, inc. BCD.00638_AA