The QME48T40 DC-DC Series of converters provide outstanding thermal performance in high temperature environments. 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. 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 converters provide any QME48T40 standard output voltage from 3.3 V down to 1.0 V that 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. RoHS lead-free solder and lead-solder-exempted products are available Delivers up to 40 A Outputs available: 3.3, 2.5, 1.8, 1.5, 1.2 and 1.0 V Industry-standard quarter-brick pinout On-board input differential LC-filter Startup into pre-biased load No minimum load required Dimensions: 1.45 x 2.30 x 0.425 (36.83 x 58.42 x 10.80 mm) Weight: 1.2 oz 34.2 g Meets Basic Insulation requirements of EN60950 Withstands 100 V input transient for 100 ms Fixed-frequency operation Fully protected Remote output sense Non-Latching / Latching OTP option Positive or negative logic ON/OFF option Output voltage trim range: +10%/20% with industry-standard trim equations (10% for 1.2 V and 1.0 V) High reliability: MTBF = 13.9 million hours, calculated per Telcordia TR- 332, Method I Case 1 Approved to the following Safety Standards: UL/CSA60950-1, EN60950-1, and IEC60950-1 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 QME48T40 Series 1. Conditions: T = 25C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, All output voltages, 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 Input Under Voltage Lockout Turn-on Threshold 33 34 35 VDC Turn-off Threshold 31 32 33 VDC Input Voltage Transient 100 ms 100 VDC Isolation Characteristics I/O Isolation 2000 VDC Isolation Capacitance 2 nF Isolation Resistance 10 M Feature Characteristics Switching Frequency 460 kHz 1 Output Voltage Trim Range Non-latching (3.3 - 1.5 V) -20 +10 % Non-latching (1.2 V and 1.0 V) -10 +10 % 1 Remote Sense Compensation Percent of VOUT(nom) +10 % Output Overvoltage Protection Non-latching 117 128 140 % Auto-Restart Period Applies to all protection features 200 ms Turn-On Time 4 ms ON/OFF Control (Positive Logic) Converter Off (logic low) -20 0.8 VDC Converter On (logic high) 2.4 20 VDC ON/OFF Control (Negative Logic) Converter Off (logic high) 2.4 20 VDC Converter On (logic low) -20 0.8 VDC 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 should not exceed 10% of VOUT(nom), in order to ensure specified operation of overvoltage protection circuitry tech.support psbel.com