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OKI-T/36W-W40 Series
Selectable Output 36-Watt DOSA-SMT DC/DC Converters
Speci?cation Notes, Cont.:
Soldering Guidelines
(5)
(6)
(7)
(8)
(9)
The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced
to -Input Common. A logic gate may also be used by applying appropriate external voltages which do not
exceed +Vin.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected
setting.
Deleted.
Output noise may be further reduced by adding an external ?lter. At zero output current, the output may
contain low frequency components which exceed the ripple speci?cation. The output may be operated
inde?nitely with no load.
All models are fully operational and meet published speci?cations, including “cold start” at –40? C.
Murata Power Solutions recommends the speci?cations below when installing these
converters. These speci?cations vary depending on the solder type. Exceeding these
speci?cations may cause damage to the product. Your production environment
may differ therefore please thoroughly review these guidelines with your process
engineers.
Reflow Solder Operations for surface-mount products (SMT)
(10) Regulation speci?cations describe the deviation as the line input voltage or output load current is varied
from a nominal midpoint value to either extreme.
For Sn/Ag/Cu based solders:
(11) Other input or output voltage ranges will be reviewed under scheduled quantity special order.
(12) Maximum PC board temperature is measured with the sensor in the center of the converter.
(13) Do not exceed maximum power speci?cations when adjusting the output trim.
(14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external
output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will
reduce output noise but may change the transient response. Newer ceramic caps with very low ESR may
require lower capacitor values to avoid instability. Thoroughly test your capacitors in the application. Please
refer to the Output Capacitive Load Application Note.
(15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times.
Otherwise, you risk having the converter turn off. The undervoltage shutdown is not latching and will
attempt to recover when the input is brought back into normal operating range.
(16) The outputs are not intended to sink appreciable reverse current.
(17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output.
If the overcurrent condition still exists, the restart current will be removed and then tried again. This short
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
Less than 1 oC. per second
45 to 75 seconds
260 oC.
Less than 3 oC. per second
Less than 1 oC. per second
60 to 75 seconds
235 oC.
Less than 3 oC. per second
current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter
immediately recovers normal operation.
Recommended Lead-free Solder Re?ow Pro?le
Output Voltage Adustment
The output voltage may be adjusted over a limited range by connecting an
external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim
resistor must be a 1/10 Watt precision metal ?lm type, ±1% accuracy or
250
200
Peak Temp.
235-260° C
better with low temperature coef?cient, ±100 ppm/oC. or better. Mount the
resistor close to the converter with very short leads or use a surface mount
150
Soaking Zone
Re?ow Zone
time above 217° C
trim resistor.
100
120 sec max
45-75 sec
In the tables below, the calculated resistance is given. Do not exceed the
speci?ed limits of the output voltage or the converter’s maximum power
rating when applying these resistors. Also, avoid high noise at the Trim
input. However, to prevent instability, you should never connect any capaci-
50
0
<1.5° C/sec
Preheating Zone
240 sec max
tors to Trim.
0
30
60
90
120
150
Time (sec)
180
210
240
270
300
High trace = normal upper limit
Output Voltage
15 V.
12 V.
10 V.
9 V.
8 V.
7 V.
6 V.
5.02 V.
Calculated Rtrim (Ω)
52.21
504.5
1108.9
1638.9
2524.7
4305.7
9725.2
∞ (open)
Low trace - normal lower limit
R TRIM ( ? ) = _____________ – 1000
Resistor Trim Equation:
10500
V OUT – 5.021V
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