Datasheet MYTNA1R84RELA2RA (Murata) - 10

MYTNA1R84RELA2RA
Document Category: Datasheet UltraBK™ 4A DC–DC Converter Module In the table below, the estimated resistance is given at limited condition. Do not exceed the specified limits of the output voltage range restricted by input voltage or the converter’s maximum power rating when applying these resistors.
OUTPUT VOLTAGE(V) CALCULATED(OHM) EXAMPLE OF Rtrim (OHM)
（
E24 RESISTOR VAULE
） 0.70 6955.3 6.8k+160 0.80 3529.1 3.3k+220 0.90 23644 2.2k+160 1.00 1777.7 1.6k+180 1.10 1424.3 1.3k+120 1.20 1188.1 680+510 1.30 1019.1 510+510 1.35 951.4 820+130 1.40 892.2 560+330 1.50 793.4 750+43 1.60 714.3 680+33 1.70 649.5 620+30 1.80 595.5 560+36
Table 7. Output Voltage and Rtrim Value Output Voltage Remote Sense Function
The MYTNA1R84RELA2RA has a sense pin, +Sense, for this function. The function is capable of compensating for the voltage drop in the wiring by connecting the sense pin to the load point. The upper limit of the compensating by sense function depends on the maximum voltage allowed to the Vout pin (within range of the Output Voltage Accuracy). The sense trace should be as short as possible and shielded by the GND line or something else to reduce noise susceptibility. The recommended sense line length is within 10cm for output voltage stability. Do NOT connect sense pin to the output of the additional LC filter that sits between the Vout pin and +Sense pin. If the remote sense is not needed, the +Sense pin should be shorted to the Vout pin.
Remote Enable Function
The MYTNA1R84RELA2RA has an enable input pin, ON/OFF, which is designed to be compatible with the low voltage digital I/O levels so that it can be easily driven by an external controller. The ON/OFF pin logic is high active and connected to the VIN though internal resistors. So if external power sequencing or control is not required, the ON/OFF pin can be left open.
Soft start Function
The MYTNA1R84RELA2RA has a soft start function. This function suppresses the inrush current and the output voltage overshoot. When the function is operating, the converter is controlled in discontinuous current mode (DCM), so the output ripple voltage may be larger than steady-state behavior which is in continuous current mode (CCM). If the input voltage drops and the operating condition deviates from the supported operation range of fig.9 “Output Voltage Range”, you should discharge the input voltage below the VIUVL and then restart. This soft start function is also compatible with pre-bias start-up. However the converter cannot prevent reverse current except during soft start, so the output must NOT be connected to a circuit that has a voltage higher than the output voltage setting.
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Copyright ©2020 Murata Manufacturing Co., Ltd. All rights reserved. Export Control Code : X0863 Document No :D90DH – 00072 MYTNA1R84RELA2RA A01 Page 10 of 26 Document Outline Product Description Features Typical Applications Efficiency Simplified Application Circuit Absolute Maximum Ratings(1)(2) Recommended Operating Conditions(1) Package Thermal Characteristics(1)(2) Electrical Characteristics Pin Configuration Pin Descriptions Functional Block Diagram Typical Performance Characteristics Thermal Deratings (Reference Data) Output Voltage Range Limitation of Input Voltage Slew rate Detailed Description Output Voltage Adjustment Resistor Trim Equation Output Voltage Remote Sense Function Remote Enable Function Soft start Function Power Good Operation Protections Over Current Protection and Short Circuit Protection Over Temperature Protection Soldering Guidelines Pb-free Solder Processes Dry Pack Information Application Performance Transient Performance Test Circuit Component Selection Input Fuse Input Capacitor Output Capacitor Packaging Information Moisture Sensitivity Level Package Drawing Recommended Board Land Pattern (Top View) Top Marking Specification Application Circuit Application Circuit Part List (Recommended) Application Board Example Tape and Reel Specification Order Codes Notices CAUTION Limitation of Applications Note Product Specification Sales contact Disclaimers Patent Statement Copyright and Trademark