10 Watt NT Single Series DC/DC Converters Features ! Fully Self Contained, No External Parts Required for Operation ! Low and Specified Input/Output Capacitance ! Efficiencies to 85% ! Overcurrent Protected for Long, Reliable Operation ! Five-sided, Shielded, Low Thermal Gradient Copper Case ! Water Washable Case Design ! Five Year Warranty Description Selection Chart These 10 Watt DC/DC converters were designed for fast integration with your system’s power needs. With no external components or filtering necessary for all but the most critical applications, these converters can provide power instantly. This saves you costly engineering time required to design your system around the power converter. Model Input Range VDC Min Max 12S3.2000NT 9 18 Output VDC Output mA 3.33 2000 2000 12S5.2000NT 9 18 5 12S12.900NT 9 18 12 900 12S15.700NT 9 18 15 700 24S3.2000NT 18 36 3.33 2000 24S5.2000NT 18 36 5 2000 24S12.900NT 18 36 12 900 24S15.700NT 18 36 15 700 48S3.2000NT 36 72 3.33 2000 2000 48S5.2000NT 36 72 5 48S12.900NT 36 72 12 900 48S15.700NT 36 72 15 700 48S5.1500NT 20 60 5 1500 10 Watt NT Single Series Block Diagram A 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 1 3/2001 10 Watt NT Single Series DC/DC Converters Input Parameters* Model 12S3.2000NT Voltage Range Reflected Ripple (2) Input Current Full Load No Load Efficiency MIN MAX TYP TYP 280 90 TYP TYP TYP 710 7 78 12S5.2000NT Reflected Ripple (2) TYP TYP TYP Switching Frequency TYP Maximum Input Overvoltage, MAX 100ms Maximum Turn-on Time, TYP 1% Output Error Recommended Fuse 24S5.2000NT 140 45 145 1100 12 82 1060 15 83 210 70 500 7 83 340 7 82 45 530 10 85 AMPS 48S5.2000NT 48S12.900NT 48S15.700NT 36 72 100 35 510 10 86 50 270 6 83 260 6 81 220 45 Units VDC 150 170 6 80 mA P-P mA RMS 260 6 84 mA % kHz 85 Model % ms (3) 18 36 210 70 mA VDC 6 48S3.2000NT mA P-P mA RMS kHz 24 24S15.700NT Units VDC 220 MIN MAX TYP TYP Input Current Full Load No Load Efficiency 24S3.2000NT 18 36 1070 7 78 24S12.900NT Voltage Range 12S15.700NT 440 Switching Frequency TYP Maximum Input Overvoltage, MAX 100ms Maximum Turn-on Time, TYP 1% Output Error Recommended Fuse Model 12S12.900NT 9 18 VDC 6 ms (3) AMPS 48S5.1500NT Units MIN MAX TYP TYP 20 60 130 40 TYP TYP TYP 200 6 78 Switching Frequency TYP Maximum Input Overvoltage, MAX 100ms Maximum Turn-on Time, TYP 1% Output Error Recommended Fuse 220 kHz 72 VDC Voltage Range Reflected Ripple (2) Input Current Full Load No Load Efficiency 6 (3) NOTES * (2) (3) (4) (5) VDC mA P-P mA RMS mA % A ms AMPS (6) The transient response is specified as the time required to settle from a 50 to 75 % step load change (rise time of step = 2 µSec) to a 1% error band. (7) Dynamic response is the peak overshoot during a transient as defined in note 6 above. (8) The input ripple rejection is specified for DC to 120 Hz ripple with a modulation amplitude of 1% of Vin. (9) The functional temperature range is intended to give an additional data point for use in evaluating this power supply. At the low functional temperature the power supply will function with no side effects, however, sustained operation at the high functional temperature will reduce expected operational life. The data sheet specifications are not guaranteed over the functional temperature range. (10) The case thermal impedance is specified as the case temperature rise over ambient per package watt dissipated. (11) Specifications subject to change without notice. All parameters measured at Tc = 25°C, nominal input voltage and full rated load unless otherwise noted. Refer to the CALEX Application Notes for the definition of terms, measurement circuits and other information. Noise is measured per CALEX Application Notes. Measurement bandwidth is 0-20 MHz for peak-peak measurements, 10 kHz to 1 MHz for RMS measurements. Output noise is measured with a 0.01µF / 100V ceramic capacitor in parallel with a 1µf / 35V Tantalum capacitor, 1 inch from the output pins to simulate standard PCB decoupling capacitance. To determine the correct fuse size, see CALEX Application Notes. The Case is tied to the -input pin. Short term stability is specified after a 30 minute warmup at full load, constant line and recording the drift over a 24 hour period. 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 2 3/2001 10 Watt NT Single Series DC/DC Converters Output Parameters* 12S3.2000NT 24S3.2000NT 48S3.2000NT Model Output Voltage MIN TYP MAX MIN MAX TYP MAX TYP MAX Output Voltage Accuracy Rated Load Range Load Regulation 25% Max Load - Max Load Line Regulation Vin = Min-Max VDC 12S5.2000NT 24S5.2000NT 48S5.2000NT 12S12.900NT 24S12.900NT 48S12.900NT 12S15.700NT 24S15.700NT 48S15.700NT 48S5.1500NT Units VDC 3.33 5 12 15 5 3.30 3.33 3.36 0.2 2.0 0.1 0.4 0.5 1.0 4.95 5.00 5.05 0.0 2.0 0.1 0.4 0.01 0.2 11.90 12.00 12.10 0.0 0.9 0.2 0.4 0.2 0.8 14.90 15.00 15.10 0.0 0.7 0.2 0.4 0.2 0.8 4.95 5.00 5.05 0.0 1.5 0.1 0.3 0.01 0.2 Short Term Stability (5) TYP < 0.05 Long Term Stability TYP < 0.1 Transient Response (6) Dynamic Response (7) TYP TYP Input Ripple Rejection (8) TYP 100 130 250 90 250 250 VDC A % % %/24Hrs %/kHrs 400 350 500 125 > 40 µs mV peak dB Noise, Peak - Peak (2) TYP 60 75 mV P-P RMS Noise TYP 6 5 mV RMS Temperature Coefficient TYP MAX 50 150 Short Circuit Protection to Common for all Outputs ppm/°C Continuous, Current Limit Protection ±0.002 General Specifications* All Models Units Isolation (4) Isolation Voltage Input to Output 12S, 24S Input to Output 48S 10µA Leakage Input to Output Capacitance Environmental Case Operating Range No Derating Case Functional Range (9) Storage Range Thermal Impedance (10) MIN MIN 700 1544 VDC TYP 400 pF MIN MAX MIN MAX MIN MAX TYP -40 90 -50 100 -55 105 15 °C/Watt 1.0 oz A BOTTOM VIEW °C SIDE VIEW °C Mechanical tolerances unless otherwise noted: °C X.XX dimensions: ±0.020 inches X.XXX dimensions: ±0.005 inches General Unit Weight Chassis Mounting Kit TYP MS6, MS8, MS15 Pin 1 2 3 4 Function +INPUT -INPUT +OUTPUT CMN 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 3 3/2001 10 Watt NT Single Series DC/DC Converters No external capacitance on the output is required for normal operation. In fact, it can degrade the converter’s performance. See our application note “Understanding DC/ DC Converters Output Impedance” and the low noise circuits for more information. The usual 1 to 10 µF aluminum or tantalum and 0.1 to 0.001 µF bypasses may be used around your PCB as required without harm. Applications Information General Information Adequate heat sinking and full filtering on both the input and output are included in the 10 Watt NT Single Series, preventing the need for additional components and heat sinking in most applications. Full overload protection is provided by independent pulseby-pulse current limiting. These protection features assure you that our 10 Watt Single will provide zero failure rate operation. Extra transient overvoltage protection may be added directly at the converter’s output pins as shown in Figure 1. A fully five-sided shielded, sealed, water washable case is standard along with specified operation over the full industrial temperature range of -40 to +90°C. 1 3 2 4 Applying the Input Figure 1 shows the recommended connections for the 10 Watt NT Single DC/DC converter. A fuse is recommended to protect the input circuit and should not be omitted. The fuse serves an important purpose in preventing unlimited current from flowing in the case of a catastrophic system failure. See our application note on input fuse selection for more information. Figure 2. For very low noise applications the circuits shown above can be used. The input current ripple will be reduced approximately 30 dB of the original value while the output noise will be reduced to below 10 mV P-P. Do not use the biggest lowest ESR capacitors that you can find in these circuits. Large capacitors can cause severe peaking in the filter’s transfer function and may actually make the conducted noise worse. No external capacitance on the input is required for normal operation. In fact, it can degrade the converter’s performance. If extra filtering is desired on the input, see the low noise input circuit in Figure 2. Extremely low ESR capacitors (< 0.25 ohms) should not be used at the input. This will cause peaking of the input filter’s transfer function and actually degrade the filter’s performance. Isolation - Case Grounding If desired, extra transient overvoltage protection may be added directly at the converter’s input pins as shown in Figure 1. The input and output sections are fully floating from each other. They may be operated fully floating or with a common ground. If the input and output sections are connected either directly at the converter or at some remote location from the converter it is suggested that a 1 to 10 µF, 0.5 to 5 ohm ESR capacitor bypass be used directly at the converter output pins. This capacitor prevents any common mode switching currents from showing up at the converter’s output as normal mode output noise. Do not use the lowest ESR, biggest value capacitor that you can find! This can only lead to reduced system performance or oscillation. A The case serves not only as a heat sink but also as an EMI shield. The 0.016 inch thick copper provides >25 dB of absorption loss to both electromagnetic and electric fields at 220 kHz, while at the same time providing about 30% more effective heat sinking than competitive 0.01 inch thick steel cases. Figure 1. Standard connections for the 10 Watt NT Single. The input fuse should not be omitted. The overvoltage diodes D1 and D2 may be added to the circuit directly at the converter to provide transient protection to your circuit. The case shield is tied to the -input pin. This connection is shown on the block diagram. The case is floating from the output, coupled only by the 400 pF of isolation capacitance. This low capacitance insures that any AC common mode noise on the inputs is not transferred to your output circuits. Compare this isolation capacitance value to the 600 to 2000 pF found on competitive designs and you’ll see that with CALEX you are getting the best DC and AC isolation available. After all, you are buying an isolated DC/DC converter to cut ground loops. Don’t let the isolation capacitance add them back in. Applying the Output The output is simply connected to your application circuit and away you go! If extra low output noise is required for your application the circuit shown in Figure 2 may be used to reduce the output noise to below 10 mV P-P. 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 4 3/2001 10 Watt NT Single Series DC/DC Converters Temperature Derating The NT Single series can operate up to 90°C case temperature without derating. Case temperature may be roughly calculated from ambient by knowing that the 10 Watt NT Singles case temperature rise is approximately 15°C per package watt dissipated. For example: If a 24 Volt input converter was delivering 7 Watts at 24 Volts input, at what ambient could it expect to run with no moving air and no extra heat sinking? Efficiency for the NT Single is approximately 84%. Check the product curves for exact information. This leads to an input power of about 8.3 Watts. Therefore, the case dissipation is 8.3 Watts (input power) minus 7 Watts (output power) or 1.3 Watts. The case temperature rise would be 1.3 Watts x 15 = 20°C. This number is subtracted from the maximum case temperature of 90°C to get 70°C. This is a rough approximation of the maximum ambient temperature. Because of the difficulty of defining ambient temperature and the possibility that the load’s dissipation may actually increase the local ambient temperature significantly or that convection cooling is suppressed by physical placement of the module, these calculations should be verified by actual measurement of operating temperature and your circuit’s exact efficiency (efficiency depends on both line input and load value) before committing to a production design. Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load). Data For 12 Volt Input Models 12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 12 VOLT EFFICIENCY Vs. LOAD 1.5 12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 85 85 1.0 50% LOAD 0.5 84 EFFICIENCY(%) 100% LOAD EFFICIENCY (%) INPUT CURRENT (AMPS) 50% FULL LOAD LINE = 9VDC 80 75 LINE = 12VDC 83 A 82 70 81 100% FULL LOAD LINE = 18VDC 0.0 65 4 6 8 10 12 14 16 18 80 0 10 20 30 LINE INPUT (VOLTS) 40 50 60 70 80 90 100 9 10 11 LOAD (%) 12 13 14 15 16 17 18 LINE INPUT(VOLTS) Data For 24 Volt Input Models 24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 24 VOLT EFFICIENCY Vs. LOAD 88 85 0.6 100% LOAD 0.4 50% LOAD 75 70 LINE = 24VDC 0.2 100% FULL LOAD 86 LINE = 18VDC 80 EFFICIENCY(%) EFFICIENCY (%) INPUT CURRENT (AMPS) 24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 90 0.8 84 50% FULL LOAD 82 65 LINE = 36VDC 0.0 60 4 8 12 16 20 24 LINE INPUT (VOLTS) 28 32 36 80 0 10 20 30 40 50 60 LOAD (%) 70 80 90 100 18 20 22 24 26 28 30 32 34 36 LINE INPUT(VOLTS) 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 5 3/2001 10 Watt NT Single Series DC/DC Converters Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load). Data For 48 Volt Input Models 48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 48 VOLT EFFICIENCY Vs. LOAD 0.4 48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 85 85 75 100% LOAD 0.2 50% LOAD 0.1 LINE = 36VDC 70 65 60 55 LINE = 48VDC 50 40 5 15 25 35 45 55 65 75 100% FULL LOAD 80 50% FULL LOAD 75 LINE = 72VDC 45 0.0 EFFICIENCY(%) EFFICIENCY (%) INPUT CURRENT (AMPS) 80 0.3 70 0 10 20 30 40 LINE INPUT (VOLTS) 50 60 70 80 90 100 35 40 45 LOAD (%) 50 55 60 65 70 75 LINE INPUT(VOLTS) Data For 48S5.1500NT Only INPUT CURRENT Vs. LINE INPUT VOLTAGE EFFICIENCY Vs. LOAD 0.6 85 100% FULL LOAD LINE = 20VDC 80 80 0.5 0.4 0.3 100% LOAD 0.2 50% LOAD EFFICIENCY(%) 75 EFFICIENCY (%) INPUT CURRENT (AMPS) 48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 85 LINE = 48VDC 70 65 60 55 0.1 50 0.0 10 20 30 40 50 60 50% FULL LOAD 70 65 60 55 LINE = 60VDC 45 0 75 50 0 10 20 30 40 LINE INPUT (VOLTS) 50 60 70 80 90 100 20 25 30 LOAD (%) 35 40 45 50 55 60 LINE INPUT(VOLTS) Data For All Models OUTPUT VOLTAGE Vs. CASE TEMPERATURE OUTPUT VOLTAGE Vs. OUTPUT LOAD OUTPUT IMPEDANCE Vs. FREQUENCY 120 0.1 0.0 -0.1 -0.2 -0.3 10 OUTPUT IMPEDANCE (OHMS) NORMALIZED OUTPUT (%) NORMALIZED OUTPUT (%) 0.2 100 80 CURRENT LIMIT MODE -> 60 40 20 "HICKUP" MODE -> -0.4 0 -40 -20 0 20 40 60 80 100 12 AND 15 VOLT 1 .1 3.3 AND 5 VOLT .01 .001 0 20 40 60 CASE TEMPERATURE (Deg C) 80 100 120 140 160 180 200 10 100 A OUTPUT LOAD (%) 1000 10000 100000 1000000 FREQUENCY (Hz) DERATING 120 INFINITE HEAT SINK OUTPUT POWER (%) 100 80 NO HEAT SINK → 60 ↑ ← SAFE OPERATING AREA → 40 ↓ 20 0 -40 -20 0 20 40 60 80 100 120 AMBIENT TEMPERATURE (Deg C) NOTES ON USING THE CURVES (2) These notes apply to all curves except the 48S5.1500NT curves. (1) The input current curves are for 10.8 Watts of output power. For 3.3 Volt output models the input current is approximately 35% less. The efficiency curves were generated for 12 Volt output models. To use for other outputs adjust as follows: 3.33 Volt output.......Subtract approximately 3% 5.0 Volt output........Subtract approximately 2% 15.0 Volt output.......Add approximately 1% 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 6 3/2001