NDTD SERIES Isolated 3W Wide Input Dual Output DC/DC Converters SELECTION GUIDE Order code FEATURES n RoHS compliant n Industry standard footprint n Power density 0.90W/cm3 n 2:1 wide input range n Dual isolated output n Short circuit protection n Low profile 24 pin case n Operating temperature range -40C to 85C n Load and line regulation <1% on both outputs n No heatsink required NDTD0503C NDTD0505C NDTD0512C NDTD0515C NDTD1203C NDTD1205C NDTD1212C NDTD1215C NDTD2403C NDTD2405C NDTD2412C NDTD2415C NDTD4803C NDTD4805C NDTD4812C NDTD4815C Input voltage V (NOM.) V mA mA 5 5 5 5 12 12 12 12 24 24 24 24 48 48 48 48 3.3 5 12 15 3.3 5 12 15 3.3 5 12 15 3.3 5 12 15 113 75 31 25 113 75 31 25 113 75 31 25 113 75 31 25 454 300 125 100 454 300 125 100 454 300 125 100 454 300 125 100 n 5V, 12V, 24V & 48V Input n 3.3V, 5V, 12V & 15V Output n Internal SMD construction n Fully encapsulated DESCRIPTION The NDTD series is a range of low profile DC/DC converters offering dual outputs over a 2:1 input voltage range. All parts deliver 3W output power up to 85C without heatsinking. A flyback oscillator design with isolated feedback is used to give regulation over the full operating range of 25% to 100% of full load. It is strongly recommended that external capacitors be used on input and output to guarantee performance over full load and input voltage range (see application notes for guidance). The plastic case is rated to UL94V-0 and encapsulant to UL94V-1 and the connection pins are formed from a tin plated alloy 42 leadframe. www.cd4power.com Input Efficiency2 Isolation current MTTF3 (MIN.) capacitance full load mA % pF kHrs 890 804 764 773 343 321 311 310 170 156 148 146 86 79 76 75 67 72 76 75 73 75 78 78 73 78 82 82 72 76 80 81 30 31 36 34 30 29 32 36 30 30 35 41 30 30 35 36 1671 1675 2075 2080 1667 1669 2090 2045 INPUT CHARACTERISTICS Parameter Voltage range n Footprint 4.73cm2 n 1kVDC isolation Output current Rated output voltage MIN. Load1 Full load Reflected ripple current4 Conditions MIN. TYP. MAX. 5V input types 12V input types 24V input types 48V input types 5V input types 12V, 24V & 48V input types 4.5 9 18 36 5 12 24 48 40 30 9 18 36 75 90 40 Units VDC mA p-p ABSOLUTE MAXIMUM RATINGS Short-circuit protection Lead temperature 1.5mm from case for 10 seconds Minimum output load for specification1 Input voltage 5V types Input voltage 12V types Input voltage 24V types Input voltage 48V types Free air space Continuous 300C 25% of rated output 10V 20V 40V 80V 10mm MIN. around component 1.Please refer to output load application note section on page 3. 2. Measured at full load with external input/output capacitors, refer to test circuit. 3. Calculated using MIL-HDBK-217F with nominal input voltage at full load (ground benign) at 25C. 4. Please refer to reflected ripple current measurement circuit on page 3. All specifications typical at TA=25C, nominal input voltage and rated output current unless otherwise specified. KDC_NDTDC.5 Page of 4 NDTD SERIES Isolated 3W Wide Input Dual Output DC/DC Converters OUTPUT CHARACTERISTICS Parameter Conditions MIN. 3.3V & 5V outputs 12V & 15V outputs TYP. MAX. Units 2 1 5 3 % Voltage set point accuracy With external input/output capacitors Line regulation Low line to high line with external input/output capacitors 0.15 0.5 % Load regulation 25% load to 100% load with external input/output capacitors with balanced load 3.3V & 5V outputs 12V & 15V outputs BW = 20Hz to 300kHz with external input/output capacitors BW = DC to 20MHz with external input/output capacitors 0.5 0.2 15 90 1.0 0.5 40 150 % % mV rms mV p-p Ripple Ripple & noise Cross regulation % voltage change on negative output when positive load varies from 12% to 50% of 3W rating, with negative load fixed at 50% NDTD05XXC, NDTD1203C, NDTD1205C, NDTD2403C, NDTD2405C, NDTD4803C, NDTD4805C 5.0 % NDTD1212C, NDTD1215C, NDTD2412C, NDTD2415C, NDTD4812C, NDTD4815C 2.1 Short circuit protection Continuous GENERAL CHARACTERISTICS Parameter Conditions Switching frequency 100% to 25% load, VIN min to max MIN. TYP. 60 TEMPERATURE CHARACTERISTICS Parameter Conditions MIN. Operation Storage -40 -50 Case temperature rise above ambient in still air 3.0 NDTD0503 NDTD1203C, NDTD2403C, NDTD4803C NDTD0505C, NDTD0512C, NDTD1205C, NDTD2405C, NDTD4805C NDTD0515C, NDTD1212C, NDTD1215C, NDTD2412C, NDTD4812C, NDTD2415C, NDTD4815C TYP. MAX. Units 620 kHz MAX. Units 85 130 54 40 35 C 28 ISOLATION CHARACTERISTICS Parameter Conditions MIN. Isolation voltage Resistance Flash tested for 1 second Viso=1KVDC 1000 1 TYP. MAX. Units VDC G 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 NDTD series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second. A question commonly asked is, "What is the continuous voltage that can be applied across the part in normal operation?" For a part holding no specific agency approvals, such as the NDTD series, 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. The NDTD series has an EI ferrite core, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to 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. This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. www.cd4power.com KDC_NDTDC.5 Page of 4 NDTD SERIES Isolated 3W Wide Input Dual Output DC/DC Converters APPLICATION NOTES Recommended Input & Output Capacitors Although these converters will work without external capacitors, they are necessary in order to guarantee the full parametric performance over the full line and load range. All parts have been tested and characterized using the following values and test circuit. Input Voltage 5V, 12V 24V, 48V CIN 100F, 25V (0.25 at 100kHz) 10F, 100V (1.5 at 100kHz) Output Voltage 3.3V, 5V 12V, 15V COUT 100F, 25V (0.25 at 100kHz) 47F, 25V (0.4 at 100kHz) Test circuit + VOUT COUT + VIN Supply + VIN NDTD CIN Supply - VIN OV COUT - VIN - VOUT Reflected Ripple Current Measurement 12H Current Probe Supply +VIN +VIN C1 NDTD CIN Supply -VIN +VOUT -VIN COUT Load COUT Load OV -VOUT C1 = 220F, ESR < 0.1 at 100kHz Output Load The minimum load for correct operation is 25% of the full rated load across the specified input voltage range. Lower loads may cause a significant increase in output ripple and may cause the output voltage to exceed its specification transiently during power-down when the input voltage also falls below its rated minimum. Cross Regulation Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the positive output. To meet ripple specification a total minimum load of 25% full load is required, however, the NDTD can be used with much lighter loading at the expense of increased ripple. A small load is required on the negative output of 150mW to ensure the maximum negative output voltage is not exceeded. TERMINOLOGY LINE REGULATION The percentage change in output voltage between low intput voltage and high intput voltage, measured with fixed output load i.e. a 5V part with an output voltage of 5.05V @ high input voltage and 5.03V @ low input voltage would have a line regulation of 0.4%. Line regulation = VOUT (Low Input V) - VOUT (High Input V) VOUT (Nominal Input V) x100% Where VOUT (Nominal Input V) is 5V. www.cd4power.com KDC_NDTDC.5 Page of 4 NDTD SERIES Isolated 3W Wide Input Dual Output DC/DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS /%5%$ 7*/ 07 07 9::88 7*/ 7*/ 7*/ 7065 Pin Function 2 3 9 11 14 16 22 23 -VIN -VIN OV -VOUT +VOUT OV +VIN +VIN 7065 RECOMMENDED FOOTPRINT DETAILS )0-&4 ."9 Weight: 6.0g All dimensions in inches 0.01 (mm 0.25mm). All pins on a 0.1 (2.54) pitch and within 0.01 (0.25) of true position. All dimensions in inches 0.01 (mm 0.25mm). All pins on a 0.1 (2.54) pitch and within 0.01 (0.25) of true position. TUBE OUTLINE DIMENSIONS RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300C for 10 seconds. The pin termination finish on this product series is Tin. The series is backward compatible with Sn/Pb soldering systems. All dimensions in inches 0.01 (mm) 0.5mm. Tube length : 20.470.079 (520mm 2mm). Tube Quantity : 15 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) C&D Technologies (NCL) Limited 2006 KDC_NDTDC.5 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 www.cd4power.com For further information, please visit www.cd4power.com/rohs C&D Technologies (NCL) Ltd Tanners Drive, Blakelands North Milton Keynes, MK14 5BU, UK C&D Technologies, Inc. 11 Cabot Boulevard, Mansfield MA 02048-1151, USA Tel: +44 (0)1908 615232 Fax: +44 (0)1908 617545 email: mk@cdtechno.com Tel: +1 (508) 339-3000 Fax: +1 (800) 233-2765 email: sales@cdtechno.com KDC_NDTDC.5 Page of 4