OHD2805S OHD2815S OHD2812S LOW PROFILE DC/DC CONVERTER INA HERMETIC METAL PACKAGE Low Profile Hermetic DC'DC Converter +5. +12, And +15 Volt In A Metal Package FEATURES Up To 20 Watts Output Power 5, 12, 15 Vde Outputs MIL-STD-704D Compatible NAVMAT P-4855-1A Component Derating Ultra-Low Profile: 0.385" Height Constant Frequency PWM Design Seam Welded Case For Enhanced Reliability Low Voltage Lockout 16 to 40 Vdc Input Range -55 to +125C Full Power Operation Up to 81% Efficiency Industry Standard Pin-Outs Magnetic Feedback ; Short Circuit Current Limiting Protection Cascaded Dual Loop Control Scheme For Superior Load Transient Characteristics Available Hi-Rel Screened DESCRIPTION Omnirels OHD2800S series of DC/DC Converters are rated up to 20 watts of output power over the full military temperature range. These converters are supplied in a fully hermetic, ultra-low profile package to produce a power density of up to 22 watts per cubic inch. MAXIMUM RATINGS (T = 25C. Vix = 28 Vdc unless otherwise specified) Operating Temperature Range ............ 00... eee ee eee eee eee ee -56C to +125C (Toase) Storage Temperature Range ............ 0... eee ees -65C to +150C IS0lation occ eee een eee eee nb eeeeees >100 MQ @ 500 Vde Conversion Frequency: Free Run Mode.............. cece eee eee eee 400 KHz Sync. Mode. ..... 0.6... eee 425 KHz - 525 KHz 4114 RO 2.1-1 Omnirel oO OHD2805S OHD2812S OHD2815S ELECTRICAL CHARACTERISTICS Parameters Conditions OHD2805S OHD2812S OHD2815S Units Input Vi Range No Load to Full Load put Voltage Rang OBC to 125C 1610 40 16 to 40 16 to 40 Vde Max. tnput Current No Load 40 50 60 mA Max. Input Ripple Current Full Load DC to 2 MHz 25 2 25 mAp-p Output Voltage Full Load 5.0 (43%) 12.0 (42%) 15.0 (42%) Vdc Min. Output Power Viy = +16 Vde to +40 Vde 55C to +125C 15 20 20 W Min. Output Current Vin = +16 Vdc to +40 Vde 55C to +125C 0to3.0 0 to 1.67 Oto 1.33 A Max. Output Ripple Full Load Voltage DC to 2 MHz 35 35 35 mVp-p Max. Load Regulation No Load to Full Load 15 15 15 mV Max. Line Regulation Full Load 10 10 10 mV Typ. Efficiency Full Load 79 81 81 % Step Load Response Typ. Transient No Load to Full Load +200 +250 +300 mV Full Load to No Load Typ. Recovery No Load to Full Load 65 65 65 us Full Load to No Load Input >! Output Filter Filter PWM | (2) " Error Amp | | & Ref. Omnirel & 2.1-2 Topology The OHD2800S series is a single ended forward converter operating at a nominal oscillator frequency of 400 KHz. These fixed frequency converters use a resonant transformer reset circuit which allows for a maximum duty cycle of 67% without increasing the voltage stress on the primary MOSFET or output rectifiers. Tight line and load regulation are achieved through wide bandwidth magnetic feedback circuit. This magnetic feedback circuit, in conjunction with bipolar control ICs, offers greater long term reliability and radiation tolerance when compared to converters using an optocoupler feedback circuit and/or CMOS control ICs. High Reliability Design Omnirels OHD2800S series of DC/DC converters are designed to achieve the high reliability demanded by military programs. The case is resistance seam welded for superior long term hermeticity. The converters use only ceramic input capacitors to provide high product reliability over the military temperature range of - 58C to +125C. All semiconductor devices are of the highest level of performance and reliability. Omnirels converters are designed in accordance with the NAVMAT P-4855-1A component derating guidelines when operating over the MIL- STD-704D input voltage range. The converters meet the conducted emissions (CE03) noise limits of MIL-STD-461C when operated with Omnirels OFC461 EMI filter module. 2.1-3 OHD2805S OHD2812S OHD2815S Flexible Synchronization The OHD2800S series offers two different synchronization options. The standard OHD2800S can be synchronized to an external system clock for any rate between 425 KHz and 525 KHz. A second option allows the system designer to synchronize multiple slave converters to one master converter. The appropriate parts must be ordered to utilize this master/slave configuration. A suffix of -MST is added for the master part number and -SLV suffix for the slave part number. Example: Part No.: OHD2805S-MST Description: Master Synch. Config. Inhibit Feature The OHD2800S series of converters provide an active low (<0.8 V) inhibit pin that can be used to disable the converter, resulting in a Zero output voltage and very low quiescent current. Low Voltage Lockout Omnirels OHS2800S series of converters are designed to operate from an input voltage of 16 to 40 Vde. The converter will not start until the input voltage reaches approximately 15 Vdc. Once operating, the unit will shut down when the input voltage drops below approximately 14 Vdc. Omnirel & OHD2805S OHD2812S OHD2815S 2.110 _____+ 255 > 1.600 > ics 8 PLCS. | @1 @2 @3 @4 Os BOTTOM VIEW TO FRAME | PIN 8 BRAZED G10 G9 +s O7 Ge MECHANICAL OUTLINE ss DIA. .038 10 PLCS. .042 a [ | I 4.010 SIDE VIEW .390 MAX. PIN CONNECTION Pin OHD2805S OHD2812S/OHD2815S 1 + Input + Input 2 Inhibit Input Inhibit Input 3 Output Adjust NC 4 | Output Common Output Common 5 + Output + Output 6 NIC NIG 7 N/G NC 8 Case Ground Case Ground 9 Sync Sync 10 Input Common Input Common ORDERING INFORMATION OHD 28 XX S Xx XXX + ' _ Output Synchronization Voltage Package Style MST = Master 05 =5 Vdc Outputs F = Flange Option SLV = Slave input 12=12Vdc | | S = Single Blank For Blank For {Model | |Voltage) | 15-15 dc | | D~=Dual | | Standard Package | | Standard Package . m Omnirel 094 205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246