Efficiency up to 96%, no need for heatsinks Pin-out compatible with LM78XX linears Features Low profile (L*W*H=11.6*8.5*10.4mm) DC/DC Converter Wide input range (5V - 42V) Short circuit protection, thermal shutdown Switching Low ripple and noise IEC/EN60950 certified Regulator R-78C-1.0 Positive to negative converter Description 1.0 Amp The R-78Cxx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators SIP3 and are pin compatible. Efficiencies of up to 96% means that very little energy is wasted as heat and the high input voltage is a useful feature. Single Output Selection Guide Part Input Output Output Efficienc y Number Voltage Range Voltage Current min Vin max. Vin VDC VDC A % % R-78C1.8-1.0 5 - 42 1.8 1.0 80 71 R-78C3.3-1.0 7 - 42 3.3 1.0 89 79 R-78C5.0-1.0 8 - 42 5 1.0 93 85 R-78C9.0-1.0 12 - 42 9 1.0 95 90 R-78C12-1.0 15 - 42 12 1.0 96 92 R-78C15-1.0 18 - 42 15 1.0 96 94 Model Numbering R-78C -1.0 Output Voltage Output Current IEC60950-1 certified EN60950-1 certified Specifications (measured at Ta= 25C, minimum load, otherwise specified) EN55032 compliant BASIC CHARACTERISTICS Parameter Condition Min. Typ. Max. Input Voltage Range Vout +3V 42VDC Output Voltage Range 1.8VDC 15VDC (1) Minimum Load 0% Quiescent Current 1mA Internal Operating Frequency 280kHz 350kHz 420kHz Vin= 24VDC Vout=1.8-15 75mVp-p 120mVp-p (2) Output Ripple and Noise 20MHz BW full load 30mVp-p 470F with normal start-up time, no external components Max. Capacitive Load 6800F with <1 second start-up time + diode protection circuit Notes: Note1: No load operation will not damage these devices, however they may not meet all specifications A minimum load of 10mA is required Note2: Measurements are made with a 10F MLCC across output. (low ESR) REGULATIONS Parameter Condition Value Output Voltage Accuracy full load 2% typ. / 3% max. Line Voltage Regulation max. Vin, full load 0.2% typ. Load Voltage Regulation max. Vin. and 10% to 100% load 0.4% typ. 100% <-> 50% load 75mV max. Transient Response 100% <-> 10% load 200mV max. www.recom-power.com REV.: 3/2019 I-1R-78C-1.0 DC/DC Converter Series Specifications (measured at Ta= 25C, minimum load, otherwise specified) PROTECTIONS Parameter Condition Value Short Circuit Protection (SCP) continuous, automatic recovery Short Circuit Input Current nom. Vin = 24VDC 65mA typ. External Zener Diode Calculation for Output Over Voltage Protection Minimum Zener Breakdown Voltage (VZmin) VOUTnom + 3% Accuracy R-78C Vout Zener Voltage, Vz (Vzmin) Recommended Zener Diode R-78Cxx-1.0 1.8V (1.85V max.) 2.0V (1.90V) MMSZ679T1G +V +V IN OUT 3.3V (3.4V max.) 3.6V (3.42V) MMSZ4685T1G 5V (5.15V max.) 5.6V (5.32V) MMSZ4690T1G 9V (9.27V max.) 10V (9.50V) MMSZ4697T1G 12V (12.36V max.) 13V (12.35V) 14V (13.30V) MMSZ4700T1G / MMSZ4701T1G 15V (15.45V max.) 17V (16.15V) MMSZ4704T1G ENVIRONMENTAL Parameter Condition Value Operating Temperature Range with derating (see graph) -40C to +85C Max. Case Temperature +100C Temperature Coefficient 0.015%/C Case Thermal Impedance 70C/W max. Operating Altitude 2000m Operating Humidity non condensing 5% - 95% max., RH Pollution Degree PD2 3 +25C 8600 x 10 hours MTBF MIL-HDBK 217F +68C 3880 x 10 hours 100 Derating Graph 90 80 70 60 50 40 30 20 10 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 68 85 Ambient Temperature C SAFETY AND CERTIFICATIONS Certificate Type (Safety) Report / File Number Standard IEC60950-1:2005, 2nd Edition + AM 2:2013 Information Technology Equipment, General Requirements for Safety 1603123 EN60950-1:2006 + AM2:2013 RoHS 2+ RoHS 2011/65/EU + AM2015/863 EAC RU-AT.49.09571 TP TC 004/2011 continued on next page www.recom-power.com REV.: 3/2019 I-2 Output Load %