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OKY-T10 Datasheet(PDF) 5 Page - Murata Power Solutions Inc. |
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OKY-T10 Datasheet(HTML) 5 Page - Murata Power Solutions Inc. |
5 / 16 page Specification Notes, Cont.: (5) 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. (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) For W5 models, the Input Voltage must exceed the Output Voltage at all times by 0.5 Volts or greater. (8) Output noise may be further reduced by adding an external filter. At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (9) All models are fully operational and meet published specifications, including “cold start” at –40° C. (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (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 specifications 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 current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation. 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 film type, ±1% accuracy or better with low temperature coefficient, ±100 ppm/oC. or better. Mount the resistor close to the converter with very short leads or use a surface mount trim resistor. In the tables below, the calculated resistance is given. Do not exceed the specified 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- tors to Trim. RTRIM ( :) = _____________ – 5110 VOUT – 0.7525V 21070 OKY-T/10-W5, -T/16-W5 Output Voltage Calculated Rtrim (KΩ) 3.3 V. 3.160 2.5 V. 6.947 2.0 V. 11.780 1.8 V. 15.004 1.5 V. 23.077 1.2 V. 41.973 1.0 V. 80.021 0.7525 V. ∞ (open) Resistor Trim Equation, W5 models: Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ therefore please thoroughly review these guidelines with your process engineers. Recommended Lead-free Solder Reflow Profile High trace = normal upper limit Low trace - normal lower limit 0 50 100 150 200 250 0 30 60 90 120 150 180 210 240 270 300 Time (sec) Preheating Zone 240 sec max Soaking Zone 120 sec max Reflow Zone time above 217° C 45-75 sec Peak Temp. 235-260° C <1.5° C/sec Reflow Solder Operations for surface-mount products (SMT) For Sn/Ag/Cu based solders: Preheat Temperature Less than 1 ºC. per second Time over Liquidus 45 to 75 seconds Maximum Peak Temperature 260 ºC. Cooling Rate Less than 3 ºC. per second For Sn/Pb based solders: Preheat Temperature Less than 1 ºC. per second Time over Liquidus 60 to 75 seconds Maximum Peak Temperature 235 ºC. Cooling Rate Less than 3 ºC. per second OKY-T/10 & T/16-W5 Series Programmable DOSA-SMT 10/16-Amp DC/DC Converters www.murata-ps.com email: sales@murata-ps.com 22 Mar 2010 MDC_OKY_T10T16.W5.A03 Page 5 of 16 |
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