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NPH15S Datasheet(PDF) 3 Page - C&D Technologies |
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NPH15S Datasheet(HTML) 3 Page - C&D Technologies |
3 / 8 page www.cd4power.com NPH15S SERIES Isolated 15W Single Output DC/DC Converters KDC_NPH15SC.6 Page 3 of 8 APPLICATION NOTES OUTPUT VOLTAGE ADJUSTMENT VNOM 3.4 5.1 12.1 15.1 S 22.2973 20.59761 28.79096 39.95902 T 10.1351 9.36255 15.42373 20.77869 R 17.9994 24.49487 94.9661 147.7314 L -1.6241 -2.48374 -5.942857 -7.990244 TRIM UP TRIM DOWN When the output voltage is trimmed up, output current must be derated so that the maximum output power is not exceeded. Example to decrease output voltage of NPH15S4805EiC by 0.1V: SET VOLTAGE The output voltage of all units is set to 100mV above nominal, to offset resistive losses and thus assist with worst case error calculations. For the EiC versions, this allowance can be altered with a single fixed resistor, connected from the trimming pin to one of the output pins. SHUTDOWN FREQUENCY CONTROL When the shutdown pin is shorted to the negative input, the converter will stop. Its current consumption will then be less than 1mA at nominal supply voltage. The voltage must be less than 1.5V to ensure that the unit stops, and must be able to sink at least 1mA. The unit will restart if the control pin is left open circuit or raised to a value close to its normal open circuit voltage. This is typically 10V. Note however, that the unit will not meet specification while a significant current drain from this pin remains. If the shutdown pin is to be connected to a long wire, it is recommended that a capacitor decouples the pin to the supply common in order to avoid the risk of injecting noise into the converter circuit. A series resistor may also be helpful. Values of 10nF and 1kΩ may be used. Many NPH series converters may be switched together simply by linking the primary control pins. The primary common pins must also be linked. If the primary side dc control voltage is pulled away from its open circuit voltage, the converter frequency will be changed, approximately in proportion to the voltage. With +8.5VDC voltage to SS pin, the typical switching frequency will be 300kHz. If this is raised to 15VDC, the switching frequency will typically be 510kHz. The frequency may thus be moved away from a sensitive value or into a safe area. Deviation of at least –10% to +30% is achievable, though the efficiency will decline with significant changes. Also note that if the frequency is lowered, the switching frequency component of output ripple will increase. Since the design uses no large electrolytic capacitors, any use of a lower frequency must allow for the effects of increased ripple. Additional external filtering may be required. +VIN +VOUT -VOUT TRIM RUP NPH15S The trim resistor equations are: Rup = (R/Vup) - S kΩ Rdown = (L x T ) - T - S kΩ Vdown +VIN +VOUT TRIM RDOWN NPH15S -VOUT RDOWN = -2.48374 x 9.36255 - 9.36255 - 20.59761 = 203.18kΩ ( ) -0.1 |
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Similar Description - NPH15S_05 |
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