The new SSQE48T25025 DC-DC converter is an open frame sixteenth-brick DC-DC converter that conforms to the Distributed Open Standards Architecture (DOSA) specifications. The converter operates over an input voltage range of 36 to 75 VDC, and provides a tightly regulated output voltage with an output current up to 25 A. The output is fully isolated from the input and the converter meets Basic Insulation requirements permitting a positive or negative output configuration. The converter is constructed using a single-board approach with both planar and discrete magnetics. The standard feature set includes remote On/Off (positive or negative logic), input undervoltage lockout, output overvoltage, overcurrent, and short circuit protections, output voltage trim, and overtemperature shutdown with hysteresis. With standard pinout and trim equations and excellent thermal performance, the SSQE48T25025 converters can replace in most cases existing eighth-brick converters. Inclusion of this converter in a new design can result in significant board space and cost savings. 36-75 VDC Input 2.5 VDC 25 A Industry-standard DOSA pinout Output: 2.5 V at 25 A On-board input differential LC-filter Start-up into pre-biased load No minimum load required Weight: 0.44 oz 12.3 g Meets Basic Insulation requirements of EN60950 Withstands 100 V input transient for 100 ms Fixed-frequency operation Hiccup overcurrent protection Fully protected (OTP, OCP, OVP, UVLO) Remote sense Remote ON/OFF positive or negative logic option Output voltage trim range: +10%/20% with industry-standard trim equations Low height of 0.374 (9.5 mm) Industry standard 1/16th brick footprint: 0.9 by 1.3 High reliability: MTBF = 16.23 million hours, calculated per Telcordia TR-332, Method I Case 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 Approved to the latest edition and amendment of ITE Safety standards, UL/CSA 60950-1 and IEC60950-1 RoHS lead free solder and lead-solder-exempted products are available 2 SSQE48T25025 Conditions: TA = 25C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin = 33 F, unless otherwise specified. PARAMETER CONDITIONS / DESCRIPTION MIN TYP MAX UNITS Absolute Maximum Ratings Input Voltage Continuous 0 80 VDC Operating Ambient Temperature -40 85 C Storage Temperature -55 125 C Isolation Characteristics I/O Isolation 2250 VDC Isolation Capacitance 150 pF Isolation Resistance 10 M Feature Characteristics Switching Frequency 440 kHz 1 Output Voltage Trim Range Industry-standard equations (2.5V) -20 +10 % 1 Remote Sense Compensation Percent of V (NOM) +10 % OUT Output Over-voltage Protection Non-latching 120 130 140 % Over-temperature Shutdown (PCB) Non-latching 125 C Sinking current from external voltage source Peak Backdrive Output Current during equal V (NOM) 0.6 V and connected to 50 mADC OUT startup into prebiased output output via 1Ohm resistor Backdrive Output Current in OFF state Converter OFF external voltage = 5 VDC 10 mADC Auto-Restart Period Applies to all protection features 200 ms Turn-On Time See Figures E, F, and G 5 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 Mechanical Weight 12.3 g Reliability Telcordia SR-332, Method I Case 1 MTBF 16.23 MHrs 50% electrical stress, 40C ambient 1 Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources shall not exceed 10% of VOUT(NOM) in order to ensure specified operation of overvoltage protection circuitry. tech.support psbel.com