DCH SERIES 3 WATT DC/DC CONVERTERS 5 OR 28 VOLT INPUT Features • NOT RECOMMENDED FOR NEW DESIGNS –55°C to 100°C • 5 or 28 VDC input • Fully isolated • Output regulated from input side • 100 kHz typical switching frequency • Topology – Push-Pull DC/DC Converter • Up to 75% efficiency • No minimum load • Output capacitor suggested Size (max.): Weight: Screening: MODELS VDC OUTPUT SINGLES DUALS 5 12 ±12 ±15 0.975 x 0.800 x 0.350 inches (24.77 x 20.32 x 8.89 mm) See case A3 for dimensions. 20 grams typical Standard or ES. See “100°C Non-QML Products – Environmental Screening (Standard & ES)” screening table for screening options. DESCRIPTION The DCH Series™ offers isolated, unregulated DC/DC converters with up to 3 watts of output power in a low profile (0.350 max.) metal package. Single and dual output models are available with input voltages of 5 or 28 VDC. DCH Series converters operate over a –55°C to +100°C temperature range. Figure 1 shows a standard connection scheme for a dual output model. Users may also elect to use a dual output device to provide a single output at double the rated output voltage. The double voltage connection is achieved by leaving the normal output common pin (Pin 15) unconnected and using either the positive or negative Vout pin for the output common connection. DCH Series converters use a non-saturating core circuit operating at a frequency of approximately 100 kHz, which reduces reflected input ripple and minimizes EMI/RFI problems. For applications requiring MIL-STD-461C, CEO3, reflected input ripple levels, refer to Section B5 or contact your Interpoint representative for matching EMI filters. On all DCH Series models, a tantalum capacitor with a minimum value of 22 μF and an appropriate voltage rating should be connected between the output common and the output line(s) to minimize output ripple. FIGURE 1: DUAL DCH CONVERTER WITH EXTERNAL CAPACITORS Positive Input 28 V Positive Output + Output Common + Input Common Negative Output Load Load Typical Performance Curves: 25°C Tc, nominal Vin Efficiency DCH2805S FIGURE 2 Output Current vs Output Voltage DCH2805S FIGURE 3 1 DCH SERIES 3 WATT DC/DC CONVERTERS ABSOLUTE MAXIMUM RATING TYPICAL CHARACTERISTICS Output Power • 3 watts Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –55°C to +125°C Output Voltage Tolerance (Full Load) • 5 volt output models ±0.25 • 15 volt output models ±0.5 Line Regulation • Output is directly proportional to input voltage. Output Voltage Temperature Coefficient • 0.02%/°C maximum Converter Frequency • 100 kHz typical Isolation • 100 megohm minimum at 500 V RECOMMENDED OPERATING CONDITION Input Voltage Range (VDC) • 5 volt input models 4.0 to 6.5 • 28 volt input models 20.0 to 32.0 Case Operating Temperature (Tc) • –55°C to +100°C full power Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. OUTPUT CURRENT NOMINAL VDC OUTPUT CURRENT NOMINAL VDC TC = -55°C TO +100°C MAX TC = -55°C TO +100°C MAX mA W EFFICIENCY FULL LOAD LOAD REGULATION 50% TO FULL LOAD TYP mV INPUT CURRENT2 10% LOAD OUTPUT RIPPLE MAX mA MAX mV-pp INPUT VOLTAGE OUTPUT VOLTAGE MODEL NUMBER NOMINAL VDC NOMINAL VDC DCH0505S 5 5 400 2.0 67 470 220 300 DCH0512S 5 12 208 2.5 72 830 250 200 DCH0512D 5 ±12 ±104 2.5 72 830 250 100 DCH0515D 5 ±15 ±83 2.5 72 830 250 100 DCH2805S 28 5 500 2.5 68 450 50 300 DCH2812S 28 12 250 3.0 75 375 50 200 DCH2812D 28 ±12 ±125 3.0 75 375 50 100 DCH2815D 28 ±15 ±100 3.0 75 375 50 100 MIN % Notes 1. Nominal output voltage is correct only for nominal input voltage. Output voltage changes in proportion to input voltage. 2. Output ripple results require the connection of a tantalum capacitor (22 μF minimum) across each output. PIN OUT Pin 1 2 3 8 9 14 15 16 Designation Positive Input No Connection Input Common No Connection Case Negative Output1 Output Common1 Positive Output Note 1. Pins 14 and 15 are connected internally on single output models. MODEL NUMBERING KEY Dot on top of cover indicates pin one. DCH 1 2 3 8 BOTTOM VIEW DCH 16 15 14 9 See case A3 for dimensions FIGURE 6: PIN OUT 28 12 D / ES Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) 2 DCH SERIES 3 WATT DC/DC CONVERTERS BOTTOM VIEW CASE A3 Seam Seal Projection Weld Dot on top of case indicates pin one. 0.805 max (20.45) 0.697 (17.70) 1 2 3 8 16 15 14 9 Seal hole: 0.056 ±0.002 (1.42 ±0.05) 0.835 (21.21) 0.980 max (24.89) 0.000 0.27 ±0.02 (6.9 ±0.5) 0.000 0.350 max (8.89) 0.27 ±0.02 (6.9 ±0.5) 0.000 0.350 max (8.89) 0.097 (2.46) 0.000 0.135 (3.43) 0.235 (5.97) 0.335 (8.51) 0.018 ± 0.002 dia. (0.46 ± 0.05) Case dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.3) for two decimal places unless otherwise specified Materials Header Kovar/Nickel Cover Kovar/Nickel Pins Kovar/Nickel/Gold, matched glass seal Case dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.3) for two decimal places unless otherwise specified CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin. Case A3, Rev C, 20060731 Please refer to the numerical dimensions for accuracy. All information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. Copyright © 1999-2006 Interpoint Corp. All rights reserved. FIGURE 7: CASE A3 3 DCH SERIES 3 WATT DC/DC CONVERTERS 100°C NON-QML PRODUCTS— ENVIRONMENTAL SCREENING (STANDARD & ES) TEST 100°C 100°C STANDARD 1 /ES non QML non QML1 yes yes no yes no yes no yes yes yes Fine Leak, Method 1014, Cond. A no yes Gross Leak, Method 1014, Cond. C no yes yes no yes yes Pre-cap Inspection Method 2017, 2032 Temperature Cycle (10 times) Method 1010, Cond. B, -55°C to 125°C ambient Constant Acceleration Method 2001, 500 g Burn-In 96 hours, typical case temperature 100°C case 2 Final Electrical Test MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case Hermeticity Test -3 Gross Leak, Dip (1 x 10 ) Final Visual Inspection Method 2009 Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Notes: 1. Non-QML products do not meet all of the requirements of MIL-PRF-38534 2. Burn-in is still air with an ambient temperature designed to bring the case temperature to 100°C 24600-001-DTS Rev B All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. DCH Series is a trademark of Interpoint. Copyright © 1991 - 2006 Interpoint. All rights reserved. 4