The Q48S15050 surface mounted DC-DC converter offers unprecedented performance in the industry-standard quarter brick format. This is accomplished through the use of patent pending circuit and packaging techniques to achieve ultra-high efficiency, excellent thermal performance and a very low body profile. In telecommunications applications the Q Family 15 A converters provide thermal performance comparable with existing 20 A designs. Low body profile and the preclusion of heat sinks minimize airflow shadowing, thus enhancing cooling for downstream devices. The use of 100% surface-mount technologies for assembly, coupled with Power Bel Solutions advanced electric and thermal circuitry and packaging, results in a product with extremely high quality and reliability. RoHS lead-free solder and lead-solder-exempted products are available Delivers up to 15 A High efficiency: 88% 15 A, 87.5% 7.5 A Start-up into pre-biased output No minimum load required No heat sink required Low profile: 0.26 6.6 mm Low weight: 1 oz 28 g typical Industry-standard footprint: 1.45 x 2.30 Meets Basic Insulation Requirements of EN60950 Withstands 100 V input transient for 100 ms On-board LC input filter Fixed-frequency operation Fully protected Remote output sense Output voltage trim range: +10%/-20% Trim resistor via industry-standard equations High reliability: MTBF 2.6 million hours, calculated per Telcordia TR- 332, Method I Case 1 Positive or negative logic ON/OFF option Approved to the latest edition and amendment of ITE Safety standards, UL/CSA 60950-1 and IEC60950-1 Meets conducted emissions requirements of FCC Class B and EN55022 Class B with external filter All materials meet UL94, V-0 flammability rating 2 Q48S15050 Conditions: TA = 25C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, 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 Input Characteristics Operating Input Voltage Range 36 48 75 VDC Input Under Voltage Lockout Non-latching Turn-on Threshold 33 34 35 VDC Turn-off Threshold 31 32 33 VDC Input Transient Withstand (Susceptibility) 100 ms 100 VDC Output Characteristics External Load Capacitance Plus full load (resistive) 10,000 F Output Current Range 0 15 ADC Current Limit Inception Non-latching 16.5 18 20 ADC Peak Short-Circuit Current Non-latching. Short=10m . 30 40 A RMS Short-Circuit Current Non-latching 5.3 Arms Isolation Characteristics I/O Isolation 2000 VDC Isolation Capacitance 230 F Isolation Resistance 10 M Feature Characteristics Switching Frequency 435 kHz 1 Output Voltage Trim Range Use trim equations on Page 6 -20 +10 % 1 Remote Sense Compensation Percent of VOUT(NOM) +10 % Output Over-Voltage Protection Non-latching 117 122 127 % Over-Temperature Shutdown (PCB) Non-latching 118 C Auto-Restart Period Applies to all protection features 100 ms Turn-On Time 2.5 ms ON/OFF Control (Positive Logic) Converter Off -20 0.8 VDC Converter On 2.4 20 VDC ON/OFF Control (Negative Logic) Converter Off 2.4 20 VDC Converter On -20 0.8 VDC Input Characteristics Maximum Input Current 15 ADC, 5.0 VDC Out 36 VDC In 2.4 ADC tech.support psbel.com