Datasheet MYTNA1R86RELA2RA (Murata) - 10

MYTNA1R86RELA2RA
Document Category: Datasheet UltraBK™ 6A 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) 0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.35
1.40
1.50
1.60
1.70
1.80 6955.3
3529.1
23644
1777.7
1424.3
1188.1
1019.1
951.4
892.2
793.4
714.3
649.5
595.5 EXAMPLE OF Rtrim (OHM)
（E24 RESISTOR VAULE）
6.8k+160
3.3k+220
2.2k+160
1.6k+180
1.3k+120
680+510
510+510
820+130
560+330
750+43
680+33
620+30
560+36 Table 7. Output Voltage and Rtrim Value Output Voltage Remote Sense Function
The MYTNA1R86RELA2RA 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 MYTNA1R86RELA2RA 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 MYTNA1R86RELA2RA 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. http://www.murata.com/products/power
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