The QmaXTM Series of high current single output dc-dc converters set new standards for thermal performance and power density in the quarter-brick package. The 45 A QM48 converters of the QmaXTM Series provide outstanding thermal performance in high temperature environments that is comparable to or exceeds the industrys leading 50 A half-bricks. This performance is accomplished through the use of patented/patent-pending circuit, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal management, and a very low-body profile. The 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 QmaXTM Series converters provide any standard output voltage from 3.3 V down to 1.0 V. Outputs can be trimmed from 20% to +10% of the nominal output voltage (10% for output voltages 1.2 V and 1.0 V), thus providing outstanding design flexibility. 36-75 VDC Input 1.0 - 3.3 VDC 45 A Output (150 W) On-board input differential LC-filter Outputs available: 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V Start-up into pre-biased load No minimum load required Low profile: 0.31 7.9 mm Low weight: 1.1 oz 31.5 g Withstands 100 V input transient for 100 ms Fixed-frequency operation Remote output sense Fully protected with automatic recovery Positive or negative logic ON/OFF option Output voltage trim range: +10%/20% with industry-standard trim equations (except 1.2 V and 1.0 V outputs with trim range 10%) High reliability: MTBF = 2.6 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 of the following standards: UL/CSA60950-1, IEC60950-1 and EN60950-1. RoHS lead-free solder and lead-solder-exempted products are available Asia-Pacific Europe, Middle East North America +86 755 298 85888 +353 61 225 977 +1 866 513 2839 2015 Bel Power Solutions, Inc. BCD.00739 AA 2 Conditions: T = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. A 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 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 I/O Isolation 2000 VDC Isolation Capacitance 1.4 nF Isolation Resistance 10 M Feature Characteristics Switching Frequency 415 kHz Industry-std. equations (3.3 - 1.5 V) -20 +10 % 1 Output Voltage Trim Range Use trim equation on Page 4 -10 +10 % (1.2 - 1.0 V) 1 Remote Sense Compensation Percent of VOUT(NOM) +10 % Output Overvoltage Protection Non-latching 117 128 140 % Overtemperature Shutdown (PCB) Non-latching 125 C Auto-Restart Period Applies to all protection features 100 ms Turn-On Time See Figs. F, G and H 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, 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 tech.support psbel.com