FEATURES • –55°C to 100°C • 4 to 6.5, 9 to 15, or 20 to 32 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 DCH SERIES 3 WATT DC/DC CONVERTERS 5, 12, OR 28 VOLT INPUT MODELS VDC OUTPUT SINGLES 5 12 28 DUALS ±12 ±15 ±28 Size (max.): 0.975 x 0.800 x 0.350 inches (24.77 x 20.32 x 8.89 mm) See section B8, case A3, for dimensions. Weight: 20 grams typical Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information. 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, 12, 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 Efficiency DCH1215D FIGURE 4 Output Current vs Output Voltage DCH1215D FIGURE 5 B4-31 DCH SERIES 3 WATT DC/DC CONVERTERS ABSOLUTE MAXIMUM RATING TYPICAL CHARACTERISTIC 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 • 12 volt output models ±0.4 • 15 volt output models ±0.5 • 28 volt output models ±0.6 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 • 12 volt input models 9.0 to 15.0 • 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. MODEL INPUT NUMBER VOLTAGE OUTPUT VOLTAGE 1 OUTPUT OUTPUT CURRENT POWER EFFICIENCY REGULATION LOAD INPUT OUTPUT TC = –55°C TC = –55°C FULL LOAD 50% TO CURRENT2 RIPPLE2 TO +100°C TO +100°C FULL LOAD 10% LOAD NOMINAL NOMINAL MAX MAX MIN TYP MAX MAX VDC VDC mA W % mV mA mVp-p DCH0505S 5 5 400 2.0 67 470 DCH0512S 5 12 208 2.5 72 830 DCH0512D 5 ±12 ±104 2.5 72 830 DCH0515D 5 ±15 ±83 2.5 72 830 DCH1205S 12 5 500 2.5 70 500 DCH1212S 12 12 250 3.0 72 440 DCH1228S 12 28 107 3.0 75 870 DCH1212D 12 ±12 ±125 3.0 72 440 DCH1215D 12 ±15 ±100 3.0 72 440 DCH1228D 12 ±28 ±53 3.0 75 870 DCH2805S 28 5 500 2.5 68 450 DCH2812S 28 12 250 3.0 75 375 DCH2812D 28 ±12 ±125 3.0 75 375 DCH2815D 28 ±15 ±100 3.0 75 375 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. 220 250 250 250 110 70 110 110 110 110 50 50 50 50 300 200 100 100 300 200 300 100 100 200 300 200 100 100 PIN OUT Pin 1 2 3 8 9 14 15 16 Designation Positive Input No Connection Input Common No Connection Case 1 Negative Output Output Common1 Positive Output Note 1. Pins 14 and 15 are connected internally on single output models. B4-32 Dot on top of cover indicates pin one. MODEL NUMBERING KEY DCH 28 12 D / ES Base Model 1 2 3 8 BOTTOM VIEW DCH 16 15 14 9 See Section B8, case A3, for dimensions FIGURE 6: PIN OUT 24600-001-DTS Rev A DQ# 1024 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 - 1999 Interpoint. All rights reserved. Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) CASES BOTTOM VIEW CASE A1 FMSA EMI Filter: Screening – Standard, ES, or 883 STF EMI Filter: Screening – Space Standard, H, or K Projection Weld Seam Seal Squared corner and dot on top of case indicate pin one. 0.697 (17.70 1 2 3 0.397 (10.08) 8 4 0.097 (2.46) 0.000 7 6 5 0.000 0.27 ±0.02 (6.9 ±0.5) 0.270 max (6.98) 0.27 ±0.02 (6.9 ±0.5) 0.000 0.018 ± 0.002 dia. (0.46 ± 0.05) BOTTOM VIEW CASE A2 MCH Series: Screening – Standard, ES, or 883 SLH Series: Screening – Space Standard, H, or K Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one. 0.697 (17.70 FIGURE 1: CASE A MAXIMUM DIMENSIONS 1 2 3 4 0.018 ± 0.002 dia. (0.46 ± 0.05) 7 0.000 0.27 ±0.02 (6.9 ±0.5) 0.000 0.27 ±0.02 (6.9 ±0.5) 0.270 max (6.98) 0.000 0.270 max (6.86) 0.097 (2.46) 0.000 6 5 0.835 (21.21) 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. FIGURE 2: CASE A1 0.435 (11.05) 0.535 (13.59) 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 0.000 Materials Header Kovar/Nickel/Gold (Case A3, Kovar/Nickel) Cover Kovar/Nickel Pins Kovar/Nickel/Gold, matched glass seal 0.270 max (6.86) 0.975 max (24.77) 0.135 (3.43) CASE A BOTTOM VIEW 0.800 max See Figures 2 - 4 (20.32) for pin configurations. 0.735 (18.67) 0.835 (21.21) Dot on top of case indicates pin one. 0.135 (3.43) 0.235 (5.97) CASE A FIGURE 3: CASE A2 BOTTOM VIEW CASE A3 DCH Series: Screening – Standard or ES Projection Weld 0.697 (17.70 1 2 3 8 16 15 14 9 0.835 (21.21) Dot on top of case indicates pin one. 0.135 (3.43) 0.235 (5.97) 0.335 (8.51) Seam Seal 0.018 ± 0.002 dia. (0.46 ± 0.05) B8-6 0.000 0.27 ±0.02 (6.9 ±0.5) 0.000 0.350 max (8.89) 0.000 0.27 ±0.02 (6.9 ±0.5) Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer to the numerical dimensions for accuracy. 0.350 max (8.89) 0.097 (2.46) 0.000 FIGURE 4: CASE A3 QA SCREENING 85°C PRODUCTS 85°C PRODUCTS TEST (85°C Products excluding HR products) STANDARD /ES 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 Gross Leak, Dip (1 x 10-3) yes no yes yes PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55°C to 125°C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70°C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case HERMETICITY TESTING FINAL VISUAL INSPECTION Method 2009 Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Applies to the following products: MFW Series MTW Series MHE/MLP Series MHL Series MRH Series MTO Series MSR Series DCH Series FM/FMA/FMB EMI Filters MSF EMI Filter C2-12