NPH15S_05

NPH15S SERIES Isolated 15W Single Output DC/DC Converters SELECTION GUIDE Order Code1 NPH15S2403EiC NPH15S2403iC NPH15S2405EiC NPH15S2405iC NPH15S2412EiC NPH15S2412iC NPH15S2415EiC NPH15S2415iC NPH15S4803EiC NPH15S4803iC NPH15S4805EiC NPH15S4805iC NPH15S4812EiC NPH15S4812iC NPH15S4815EiC NPH15S4815iC Nominal Input Voltage V 24 24 24 24 24 24 24 24 48 48 48 48 48 48 48 48 Output Voltage V 3.4 3.4 5.1 5.1 12.1 12.1 15.1 15.1 3.4 3.4 5.1 5.1 12.1 12.1 15.1 15.1 Output Current A 4.4 4.4 3.0 3.0 1.3 1.3 1.0 1.0 4.4 4.4 3.0 3.0 1.3 1.3 1.0 1.0 Current Limit A (MIN.) 7.5 7.5 5.0 5.0 2.5 2.5 2.0 2.0 7.5 7.5 5.0 5.0 2.5 2.5 2.0 2.0 Efficiency % 81 81 84 84 86 86 87 87 83 83 85 85 88 88 89 89 MTTF2 kHrs 335 335 286 286 286 286 281 281 295 295 301 301 302 302 296 296 A (MAX.) 11.0 11.0 7.5 7.5 3.7 3.7 3.0 3.0 11.0 11.0 7.5 7.5 3.7 3.7 3.0 3.0 FEATURES n compliant RoHS n efficiency to 89% High n Power density up to 2.4W/cm3 n 94V-0 package material UL n Industry standard pinout n 1950 recognized UL n latching current limit Non n Constant 350kHz frequency n 1.5kV input to output isolation n Versatile control options n Continuous rating to 30W at 40ºC without heatsink n Operation to zero load n Protected against load faults n Internal over temperature protection n no electrolytic capacitors Uses INPUT CHARACTERISTICS Parameter Voltage range Conditions Continuous operation, 24V input types Continuous operation, 48V input types MIN. 18 36 TYP. 24 48 MAX. 36 75 Units V OUTPUT CHARACTERISTICS Parameter Voltage set point error Overall voltage error Temperature coefficient of output voltage (slope) Deviation of output voltage Line regulation Load Regulation Ripple Temperature MIN-MAX Operating voltage range, 50% load 0% - 100% rated load rms 0.5 Conditions 50% load Case temperature -40ºC to 110ºC Load 0% - 100% Input specified range MIN. TYP. MAX. 0.5 2.5 250 1 0.1 0.5 Units % % ppmºC % % % mV DESCRIPTION The NPH15S series of DC/DC converters combines ease of application with versatility. The pin pattern is based on the popular industry standard, but two additional pins may optionally be fitted to provide a variety of features not commonly found on units of this type. High efficiency enables full rating to be achieved in a small package without heatsinking, and a high surge capability will provide for start-up and transient loads, whilst being thermally protected against sustained overload. Overload protection of the “constant current” type ensures start-up into complex load conditions. The copper case achieves efficient heat transfer and screening. The product range has been recognised by Underwriters Laboratory (UL) to UL 1950 for operational insulation, file number E179522 applies. 70 ISOLATION CHARACTERISTICS Parameter Conditions Isolation test voltage Resistance Flash tested for 1 second VISO = 500VDC MIN. 1500 1 TYP. MAX. Units VDC GΩ ABSOLUTE MAXIMUM RATINGS Input voltage, 24V input types Input voltage, 48V input types Output voltage Output trim control Synchronisation/shutdown control -0.5V to 40V 3 -0.5V to 80V 3 -0.3V to regulated voltage -1V to +30V ±15V relative to input return 1. Parts ending with EiC have optional TRIM and SS pins fitted. 2. Calculated using MIL-HDBK-217F with nominal input voltage at full load. 3. Absolute maximum value for 30 seconds. Prolonged operation may damage the product. All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified. www.cd4power.com KDC_NPH15SC.6 Page 1 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters CONTROL CHARACTERISTICS Parameter Voltage trimming range1 Remote switch input (voltage relative to input negative)1 Start delay Synchronisation1 Switching frequency Conditions At rated load, trim control at either output Not operating Operating, open circuit voltage Time from application of valid input voltage to output being in specification Specified drive signal MIN. ±10 -15 9 TYP. 0 10 25 MAX. 1.5 11 50 440 395 Units % V ms kHz kHz 320 330 350 TEMPERATURE CHARACTERISTICS Parameter Conditions Case temperature Storage Relative humidity Thermal protection Full load Absolute MAX. internal temperature Non condensing 85ºC Operates at case temperature MIN. -40 -40 110 TYP. MAX. 110 125 85 Units ºC % ºC THERMAL CHARACTERISTICS UL 1950 recognition: MAX. permissable loads for a given ambient temperature for any NPH15S model. Temperature (ºC) 40 50 53 60 Power (W) 15.0 15.0 15.0 13.7 Temperature (ºC) 70 80 85 90 Case Temperature 105ºC 16 19 22 24 17 20 26 28 Power (W) 11.7 9.8 8.8 7.8 MAX. power rating with case temperature maintained by external means (e.g. forced air cooling). Part Number NPH15S2403XXX NPH15S2405XXX NPH15S2412XXX NPH15S2415XXX NPH15S4803XXX NPH15S4805XXX NPH15S4812XXX NPH15S4815XXX 100ºC 19 22 25 26 20 23 28 30 110ºC 12 15 19 21 13 16 23 25 Units W W THERMAL PERFORMANCE 24V Input 48V Input 1. Optional - where fitted. www.cd4power.com KDC_NPH15SC.6 Page 2 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters APPLICATION NOTES OUTPUT VOLTAGE ADJUSTMENT The trim resistor equations are: Rup = (R/Vup) - S kΩ Rdown = (L x T ) - T - S kΩ Vdown VNOM S T R L 3.4 22.2973 10.1351 17.9994 -1.6241 5.1 20.59761 9.36255 24.49487 -2.48374 12.1 28.79096 15.42373 94.9661 -5.942857 15.1 39.95902 20.77869 147.7314 -7.990244 TRIM UP +VIN TRIM +VOUT TRIM DOWN +VIN +VOUT NPH15S RUP NPH15S RDOWN TRIM -VOUT -VOUT 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: RDOWN = -2.48374 x 9.36255 - 9.36255 - 20.59761 = 203.18kΩ -0.1 ( ) 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 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. FREQUENCY CONTROL 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. www.cd4power.com KDC_NPH15SC.6 Page 3 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters APPLICATION NOTES (continued) SYNCHRONIZATION The converter frequency may be synchronised to an external frequency by connecting a negative going pulse to the SS pin. The drive signal is typically 8V to 12V amplitude and 100ns to 200ns duration. A suitable circuit consists of a CMOS timer (TLC555) connected as an oscillator or as a pulse shaper. Its logic output (not the discharge output) should be connected via a 4.7nF capacitor to the converter pin. The synchronised frequency is above the free running value. However, the free running frequency can be lowered, so that sychronisation may include frequencies near or below the natural value. An example of a practical circuit is shown below, which uses a zener diode to lower the natural frequency. Several converters of this family may be synchronised from the same reference provided the waveform can be maintained by the use of an adequate driver circuit. If the rise time is more than 20ns, for example, synchronisation may not be achieved over the specified frequency range. For best efficiency, set the frequency within the specified range of its natural state. TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. C&D Technologies NPH15S series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1500 VDC for 1 second. A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?” The NPH15S series has been recognized by Underwriters Laboratory, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard requirements. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. While manufactured parts can withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. www.cd4power.com KDC_NPH15SC.6 Page 4 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters EMC FILTERING AND SPECTRA FILTERING The module includes a basic level of filtering, sufficient for many applications. Where lower noise levels are desired, filters can easily be added to achieve any required noise performance. A DC/DC converter generates noise in two principle forms: that which is radiated from its body and that conducted on its external connections. There are three separate modes of conducted noise: input differential, output differential and input-output. This last appears as common mode at the input and the output, and cannot therefore be removed by filtering at the input or output alone. The first level of filtering is to connect a capacitor between input and output returns, to reduce this form of noise. It typically contains high harmonics of the switching frequency, which tend to appear as spikes on surrounding circuits. The voltage rating of this capacitor must match the required isolation voltage. (Due to the great variety in isolation voltage and required noise performance, this capacitor has not been included within the converter.) Input ripple is a voltage developed across the internal Input decoupling capacitor. It is therefore measured with a defined supply source impedance. Although simple series inductance will provide filtering, on its own it can degrade the stability. A shunt capacitor is therefore recommended across the converter input terminals, so that it is fed from a low impedance. If no filtering is required, the inductance of long supply wiring could also cause a problem, requiring an input decoupling capacitor for stability. An electrolytic will perform well in these situations. The input-output filtering is performed by the common-mode choke on the primary. This could be placed on the output, but would then degrade the regulation and produce less benefit for a given size, cost, and power loss. Radiated noise is present in magnetic and electrostatic forms. The latter is suppressed by the metal case, which is connected to the output return, typically a zero-volt point. Thanks to the small size of these units, neither form of noise will be radiated “efficiently”, so will not normally cause a problem. Any question of this kind usually better repays attention to conducted signals. EMC FILTER AND VALUES TO OBTAIN SPECTRA AS SHOWN Component reference C1 NPH15S2403 NPH15S2405 NPH15S2412 NPH15S2415 NPH15S4803 NPH15S4805 NPH15S4812 NPH15S4815 10µF 100V 10µF 100V 10µF 100V 10µF 100V 10µF 100V 10µF 100V 10µF 100V 10µF 100V C2 2.2µF 63V 2.2µF 63V 2.2µF 63V 2.2µF 63V Not required Not required Not required Not required C3 47µF 63V 47µF 63V Not required 47µF 63V Not required Not required Not required Not required C4 10µF 25V 10µF 25V 10µF 25V 10µF 25V 10µF 25V 10µF 25V 10µF 25V 10µF 25V L1 L2 C&D 18R333C 33µH 2A C&D 18R333C 33µH 2A C&D 18R333C 33µH 2A C&D 18R333C 33µH 2A C&D 18R104C 100µH 1.2A C&D 18R104C 100µH 1.2A C&D 18R104C 100µH 1.2A C&D 18R104C 100µH 1.2A L3 C&D 18R472C 4.7µH 5.35A C&D 18R103C 10µH 3.45A C&D 18R333C 33µH 2.00A C&D 18R333C 33µH 2.00A C&D 18R472C 4.7µH 5.35A C&D 18R103C 10µH 3.45A C&D 18R333C 33µH 2.00A C&D 18R333C 33µH 2.00A C1, C2 & C4 : Electrolytic capacitors C3 : Polyester or ceramic capacitor EMC Spectra red limit line is EN 55022 curve B Quasi-peak average limit. www.cd4power.com KDC_NPH15SC.6 Page 5 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters EMC FILTERING AND SPECTRA (continued) NPH15S2403 NPH15S2405 NPH15S2412 NPH15S2415 NPH15S4803 NPH15S4805 www.cd4power.com KDC_NPH15SC.6 Page 6 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters EMC FILTERING AND SPECTRA (continued) NPH15S4812 NPH15S4815 www.cd4power.com KDC_NPH15SC.6 Page 7 of 8 NPH15S SERIES Isolated 15W Single Output DC/DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS TUBE OUTLINE DIMENSIONS All dimensions in inches ±0.01 (mm ±0.25mm) Tube length: 530 (20.866) ±2 (0.079) Tube material: Antistatic coated clear PVC Tube Quantity: 15 RECOMMENDED FOOTPRINT Weight: 36g All dimensions in inches ±0.01 (mm ±0.25mm) All pins on a 0.10 (2.54) pitch and within ±0.01 (2.54) of true position * Optional control pins The copper case is internally connected to the output (-VOUT) pin. Care is needed in the design of this circuit board on which the converter is mounted. Top side tracks must not contact the edge of the case or the ferrite core, visible on the underside of the unit. All dimensions in inches ±0.01 (mm ±0.25mm) * Optional control pins RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300ºC for 10 seconds. The pin termination finish on this product series is Matte Tin over Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems. For further information, please visit www.cd4power.com/rohs C&D Technologies (NCL) Limited reserve the right to alter or improve the specification, internal design or manufacturing process at any time, without notice. Please check with your supplier or visit our website to ensure that you have the current and complete specification for your product before use. © C&D Technologies (NCL) Limited 2005 KDC_NPH15SC.6 No part of this publication may be copied, transmitted or stored in a retrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without prior written permission from C&D Technologies (NCL) Limited. Instructions for use are available from www.cd4power.com C&D Technologies (NCL) Ltd Tanners Drive, Blakelands North Milton Keynes, MK14 5BU, UK Tel: +44 (0)1908 615232 Fax: +44 (0)1908 617545 email: MK@cdtechno.com C&D Technologies, Inc. 11 Cabot Boulevard, Mansfield MA 02048-1151, USA Tel: +1 (508) 339-3000 Fax: +1 (800) 233-2765 email: sales@cdtechno.com www.cd4power.com KDC_NPH15SC.6 Page 8 of 8