The new high temperature SQE48-Series of DC-DC converter provides a high efficiency single output in a physical 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 SQE48-Series of converters utilizes the same pinout and functionality of the industry-standard quarter-bricks. The SQE48-Series of provides thermal performance in high temperature environments that exceeds most competitors 20A 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. Low-body profile and the preclusion of heat sinks minimize airflow shadowing, thus enhancing cooling for 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. The SQE48T20050 operates over an input voltage range of 36 to 75 VDC, and provides an output current up to 20 A with a standard output voltage of 5.0 VDC. The output can be trimmed from 20% to +10% of the nominal output voltage, thus providing outstanding design flexibility. With standard pinout and trim equations, the SQE48 converters are perfect drop-in replacements for the competing quarter-brick designs. Inclusion of this converter in new designs 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. 36-75 VDC Input 5.0 VDC 20 A Output Industry-standard quarter-brick pinout On-board input differential LC-filter Startup into pre-biased load No minimum load required Weight: 0.72 oz 20.6 g Withstands 100 V input transient for 100 ms Fixed-frequency operation Fully protected Latching and non-latching protection available Positive or negative logic ON/OFF option Remote output sense Output voltage trim range: +10%/20% with industry-standard trim equations High reliability: MTBF = 13.19 million hours, calculated per Telcordia TR-332, Method I Case 1 Approved to the latest edition of the following standards: UL/CSA60950-1, IEC60950-1 and EN60950-1. Designed to meet Class B conducted emissions per FCC and EN55022 when used with external filter All materials meet UL94, V-0 flammability rating 2 SQE48T20050 Conditions: T = 25 C, 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 80 VDC Operating Ambient Temperature -40 85 C Storage Temperature -55 125 C Input Characteristics Operating Input Voltage Range 36 48 75 VDC Turn-on Threshold 33 34 35 VDC Input Under Voltage Lockout (Non-latching) Turn-off Threshold 31 32 33 VDC Input Voltage Transient 100 ms 100 VDC Isolation Characteristics 2250 VDC I/O Isolation Models with the special K feature 1500 VDC 190 pF Isolation Capacitance Models with the special K feature 1200 pF Isolation Resistance 10 M Feature Characteristics Switching Frequency 460 kHz 1 Output Voltage Trim Range Industry-std. equations -20 +10 % 1 Remote Sense Compensation Percent of VOUT(NOM) +10 % Latching or Non-latching 117 122 127 % Output Overvoltage Protection Non-latching (Models with special K feature) 120 125 130 % Overtemperature Shutdown FET Non-latching 120 C Peak Back-drive Output Current Peak amplitude 1 ADC (Sinking current from external source) Peak duration 50 s during startup into pre-biased output Back-drive Output Current Converter Off 10 30 mADC (Sinking Current from external source) external voltage 5 VDC Auto-Restart Period Applies to all protection features 200 ms (For non-latching option) Turn-On Time 4 ms Converter Off (logic low) -20 0.8 VDC ON/OFF Control (Positive Logic) Converter On (logic high) 2.4 20 VDC Converter Off (logic high) 2.4 20 VDC ON/OFF Control (Negative Logic) Converter On (logic low) -20 0.8 VDC 1 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 from all sources should not exceed 10% of VOUT (NOM), in order to ensure specified operation of overvoltage protection circuitry. tech.support psbel.com