C C S S O O R R E E M M T T P P R R L L I I E E A A V V N N N N T T Efficiency up to 93%, no need for heatsinks Features High voltage input range, up to 72VDC DC/DC Converter Short circuit protection, thermal shutdown All-in-one solution, no external components Switching required Regulator IEC/EN60950-1 + AM:2 certified R-78HB/W Description 0.5 Amp The R-78HBxx/W series high efficiency, high input voltage switching regulators are ideally suited to 3 SIP3 Wired replace 78xx linear regulators. The efficiency of up to 93% means that very little energy is wasted as heat so there is no need for any heat sinks with their additional space and mounting costs. A wide input voltage range allows the full stored energy utilization of standard 12, 24 and 36V batteries as well Single Output as COB LED drivers. No external components are required to make a complete regulated, short-cir- cuit protected supply. A built-in protection diode allows high capacitive loads. Typical applications in- clude Auxiliary fan CV power supplies powered from CC LED drivers, industrial, aerospace and battery powered applications. Selection Guide Part Input Output Output Efficiency Max. Capacitive (2) (1) Number Voltage Range Voltage Current typ min Vin. Load VDC VDC A % F R-78HB5.0-0.5/W 9-72 5.0 0.5 86 100/6800 R-78HB12-0.5/W 17-72 12 0.5 93 100/6800 Notes: Note1: Max. Cap Load is tested at nominal input and full resistive load with 1 second start-up time and no external components = 100F, with <1s start-up time = 6800F Model Numbering 2 + RoHS REACH compliant compliant R-78HB -0.5/W 10 from 10 Output Voltage Wired Output Current IEC60950-1 certified EN60950-1 certified EN55032 compliant Specifications (measured Ta= 25C, full load, nominal input voltage and after warm-up) BASIC CHARACTERISTICS Parameter Condition Min. Typ. Max. (2) Input Voltage Range nom. Vin = 48VDC 9VDC 48VDC 72VDC Quiescent Current nom. Vin = 48VDC, 10% load 1mA 5mA Internal Power Dissipation 0.65W Internal Operating Frequency full load 120kHz 800kHz (3) Minimum Load 10mA 20MHz BW limited 20mVp-p 60mVp-p Output Ripple and Noise Typical Application Circuit +V R-78HBxx-0.5/W +V IN OUT 3.3F/100V required if VIN= >50V -V -V IN OUT continued on next page www.recom-power.com REV.: 4/2021 I-1 O O P P C C R R O O M M D D O O U U C C C C E E T T R R S SR-78HB/W DC/DC Converter Series Specifications (measured Ta= 25C, full load, nominal input voltage and after warm-up) Notes: Note2: The converter has built in soft start circuit. Rapidly changing the input voltage from VIN to VIN min max can bypass this circuit and damage the converter Note3: Operation under no load will not damage the devices, however they may not meet all specifications A minimum load of 10mA is recommended Efficiency vs. Load R-78HB5.0-0.5/W R-78HB12-0.5/W 100 100 90 90 80 80 70 70 60 60 50 50 40 40 30 30 12Vin 24Vin 24Vin 20 20 36Vin 36Vin 10 10 48Vin 48Vin 0 0 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Output Load % Output Load % REGULATIONS Parameter Condition Value Output Voltage Accuracy 100% load 2.0% typ. / 3.0% max. Line Voltage Regulation Vin= min. to max., full load 0.4% typ. / 1.0% max. Load Voltage Regulation 10% to 100% load 0.3% typ. / 0.6% max. Transient Response with 100F output capacitor, 100% <-> 50% load 75mV typ. / 100mV max. PROTECTIONS Parameter Condition Value Internal Input Filter 1F capacitor Short Circuit Protection (SCP) continuous, automatic recovery Short Circuit Input Current 15mA typ. / 25mA max. Optional Protection Circuit internal structure +V Controller +V IN OUT GND GND www.recom-power.com REV.: 4/2021 I-2 Efficiency % Efficiency %