PD-97221A ATS-SERIES 28V Input, Single/Dual Output HIGH RELIABILITY DC/DC CONVERTER Description The ATS Series DC/DC converters are a family of 25W, single and dual output, high reliability devices designed for rugged environments and extended temperature operations such as those encountered in military, aerospace and industrial applications. The converters are in full compliant with CE03 and CS01 of MIL-STD461C. Features include small size, low weight and conservative component stress de-rating. For operations in radiation environments, the M3L series with the identical form factor and electrical rating is recommended. All models include an external inhibit port and have an adjustable output voltage. They are enclosed in a hermetic 1.5" x 2.3" x .425" steel package and weight less than 85grams. The package utilizes rugged ceramic feed-thru copper core pins and is sealed using parallel seam welding. Manufactured in a facility fully qualified to MIL-PRF38534, these converters are fabricated utilizing DSCC qualified processes. For available screening options, refer to device screening table in the data sheet. ATS Features n n n n n n n n n n n n n n n n 16V to 50V DC Input Range Input Transient per MIL-STD-704D Up to 25W Output Power Single and Dual Output Models Include 3.3V, 5V, 12V, 15V, ±5V, ±12V and ±15V Internal EMI Filter; Converter Capable of Meeting MIL-STD-461C CE03 and CS01 Magnetically Coupled Feedback High Efficiency - to 82% -55°C to +125°C Operating Temperature Range 100MΩ @ 500VDC Isolation Under-Voltage Lockout Short Circuit and Overload Protection Output Over Voltage Limiter Adjustable Output Voltage External Inhibit 1,500,000 Hour MTBF Low Weight, < 85 grams Applications n n n n www.irf.com Military Aircraft Commercial Aircraft Missiles Ground Equipment 1 01/16/07 ATS-SERIES Circuit Description The ATS Series converters utilize a single-ended forward topology with resonant reset. The nominal switching frequency is 500KHz. Electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. Voltage feed-forward with duty factor limiting provides high line rejection and protection against output over voltage in the event of an internal control loop failure. This mechanism limits the maximum output voltage to approximately 20% over the nominal regardless of the line voltage. An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD461C on the input power leads. A single-stage output filter reduces the typical output ripple to less than 50mV peak-to-peak. Output current is limited under any load fault condition to approximately 125% of rated. 2 An overload condition causes the converter output to behave like a constant current source with the output voltage dropping below nominal. The converter will resume normal operation when the load current is reduced below the current limit point. This protects the converter from both overload and short circuit conditions. The current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. An external inhibit port is provided to control converter operation. The converter’s operation is inhibited when this pin is pulled low. It is designed to be driven by an open collector logic device. The pin may be left open for normal operation and has a nominal open circuit voltage of 10.5V with respect to the input return (pin 2). The output voltage of all models can be adjusted using a single external resistor. www.irf.com ATS-SERIES Absolute Maximum Ratings Recommended Operating Conditions Input voltage range -0.5Vdc to +75Vdc Input voltage range Output power Internally limited Lead temperature Input voltage range +300°C for 10 seconds Output power Operating case temperature -55°C to +125°C Storage temperature -55°C to +135°C +16Vdc to +50Vdc 1 +16Vdc to +38Vdc 0 to Max. Rated Operating temperature 2 -55°C to +125°C Operating temperature 1 -55°C to +70°C 1 2 Meets derating per MIL-STD-975 For operation at +125°C see table note 13 Electrical Performance Characteristics Parameter Group A Subgroup Conditions -55°C ≤ T C ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified Input Voltage Output Voltage ( Vout ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Output power ( POUT ) ATS2803R3S All Others Output current ( IOUT ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Limits Min Nom Max Unit 16 28 50 V 3.27 4.95 11.88 14.85 ±4.95 ±11.88 ±14.85 3.30 5.00 12.00 15.00 ±5.00 ±12.00 ±15.00 3.33 5.05 12.12 15.15 ±5.05 ±12.12 ±15.15 V 3.23 4.90 11.76 14.70 ±4.90 ±11.76 ±14.70 3.37 5.10 12.24 15.30 ±5.10 ±12.24 ±15.30 V 1 1 1 1 1 1 1 IOUT = 100% rated load Note 4 2,3 2,3 2,3 2,3 2,3 2,3 2,3 IOUT = 100% rated load Note 4 1,2,3 VIN = 16, 28, 50 Volts, Note 2 0 0 20 25 1,2,3 VIN = 16, 28, 50 Volts, Note 2 0 0 0 0 0 0 0 6.06 5.00 2.08 1.67 4.00 1.67 1.33 A Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 W Line regulation ( VRLINE ) 1,2,3 VIN = 16, 28, 50 Volts IOUT = 0, 50%, 100% rated, Note 4 -0.5 0.5 % Load regulation ( VRLOAD ) 1,2,3 IOUT = 0, 50%, 100% rated, Note 4 VIN = 16, 28, 50 Volts -1.0 1.0 % 1,2,3 VIN = 16, 28, 50 Volts Duals only, Note 5 -5.0 -3.0 -3.0 5.0 3.0 3.0 % Cross regulation ( VRCROSS ) ATS2805D ATS2812D ATS2815D For Notes to Electrical Performance Characteristics Table, refer to page 5 www.irf.com 3 ATS-SERIES Electrical Performance Characteristics Parameter Input current, no load ( IIN ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Input current inhibited Output ripple ( V RIP ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Switching frequency ( FS ) Efficiency ( EFF ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Enable Input ( Inhibit Function ) open circuit voltage drive current ( sink ) voltage range ( continued ) Group A Subgroup Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified 1,2,3 IOUT = 0, Pin 4 open Min Nom Max Unit 60 70 70 70 70 100 100 mA 1,2,3 Pin 4 shorted to pin 2 8.0 mA 1,2,3 VIN = 16, 28, 50 Volts IOUT = 100% rated load Notes 4, 6 35 50 70 80 80 80 80 mV p-p 575 KHz 1,2,3 Sync. Input (Pin 4) open 425 500 1,2,3 IOUT = 100% rated load Note 4 68 75 75 75 75 75 75 75 79 80 81 79 79 80 1,2,3 Note 1 Current Limit Point Expressed as a percentage of full rated load current 1,2,3 Vout = 90% of Nominal, Note 4 Power dissipation, load fault (PD) 1,2,3 Short Circuit, Overload, Note 8 Output response to step load changes (VTLD) 4,5,6 Half Load to/from Full Load, Notes 4,9 Recovery time, step load changes (TTLD) 4,5,6 Half Load to/from Full Load, Note 4,9,10 Output response to step line changes (VTLN) 4,5,6 16V to/from 50V IOUT = 100% rated load, Notes 1,4,11 Recovery Time, step line changes (TTLN) 4,5,6 16V to/from 50V IOUT = 100% rated load, Notes 1,4,10,11 4,5,6 No Load, Full Load Notes 4,12 Turn-on Response Overshoot (VOS) Turn-on Delay (TDLY) Limits % -0.5 11.5 500 50 V µA V 105 130 % 14 W 300 mV pk 200 µs 300 mV pk 200 µs 500 10 mV ms 9.5 -300 -300 2.0 For Notes to Electrical Performance Characteristics Table, refer to page 5 4 www.irf.com ATS-SERIES Electrical Performance Characteristics Parameter Capacitive Load (CL) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Group A Subgroup 1 ( continued ) Conditions -55°C ≤ T C ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified Limits Min IOUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Each output on duals Line Rejection 1 IOUT = 100% rated load DC to 50KHz, Notes 1, 4 40 Isolation 1 Input to Output or Any Pin to Case except pin 3, test @ 500VDC 100 Device Weight MTBF Nom Max Unit 2200 1000 180 120 500 90 60 µF 50 dB MΩ 85 MIL-HDBK-217F2, GM, 35°C TBD g Hr Notes for Electrical Performance Characteristics Table 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be guaranteed to the limits specified. Parameter verified during line and load regulation tests. Output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs. Load current split equally between outputs on dual output models. Cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80% of rated. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit on page 6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit may interfere with the proper operation of the converter’s overload protection, causing erratic behavior during turn-on. Overload power dissipation is defined as the device power dissipation with the load set such that V OUT = 90% of nominal. Load step transition time ≥ 10µs. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1.0% of its steady state value. Line step transition time ≥ 100µs. Turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin (pin 4) to the point where VOUT = 90% of nominal. For operation at temperatures between +85°C and +125°C, derate the maximum input voltage linearly from 100% to 75%. www.irf.com 5 ATS-SERIES Circuit for Measuring Output Ripple Voltage 50 Ω 50 Ω Coax 1 µF Oscilloscope or equivalent with 10 MHz bandwidth, multiply readings by 2. 0.1 µF + Vout 50 Ω Termination DUT Return RL for IRATED 6 www.irf.com ATS-SERIES Figure 1. Conducted Emissions, Normal Mode 100 90 80 70 dB-uA 60 CEO3 LIMIT 50 40 30 20 10 0 1E3 1E4 1E5 1E6 1E7 1E8 1E7 1E8 Frequency ( Hz ) Figure 2. Conducted Emissions, Common Mode 100 90 80 70 dB-uA 60 CEO3 LIMIT 50 40 30 20 10 0 1E3 www.irf.com 1E4 1E5 Frequency ( Hz ) 1E6 7 ATS-SERIES Figure 3. Block Diagram - Single Output Vin 1 INHIBIT 4 RETURN 2 CASE GROUND 3 EMI FILTER +10.5V 7 +OUTPUT 6 OUTPUT RETURN 5 OUTPUT ADJUST BIAS SUPPLY + EA - RAMP GEN. PWM CONTROLLER SAMPLE & HOLD FEEDBACK TRIGGER Figure 4. Block Diagram - Dual Output Vin 1 EMI FILTER 8 +OUTPUT 7 RETURN 6 -OUTPUT 5 OUTPUT ADJUST +10.5V INHIBIT 4 RETURN 2 CASE GROUND 3 BIAS SUPPLY + EA - RAMP GEN. PWM CONTROLLER SAMPLE & HOLD FEEDBACK TRIGGER 8 www.irf.com ATS-SERIES Mechanical Outline 2.300 0.375 ø 0.128 4 Plcs 1.550 0.050 0.25 Typ. 0.270 8 0.470 1 0.400 7 0.400 1.000 Ref 1.500 1.750 2.000 3 6 4 5 2 2 Eq Spaces @ 0.200 0.400 0.200 Pin ø 0.040 0.350 0.220 0.850 2.80 Ref 0.250 Tolerance: .XX = ±0.01 .XXX = ±0.005 0.425 Max Pin Designation (Single/Dual) www.irf.com Pin # Single Dual 1 + Input + Input 2 Input Return Input Return 3 Case Case 4 Inhibit Inhibit 5 Output Adjust Output Adjust 6 Output Return - Vout 7 8 + Vout NC Output Return + Vout 9 ATS-SERIES Device Screening Requirement MIL-STD-883 Method Temperature Range Element Evaluation Non-Destructive Bond Pull Internal Visual No Suffix ES d -20°C to +85°C -55°C to +125°C HB e -55°C to +125°C CH -55°C to +125°C MIL-PRF-38534 N/A N/A N/A Class H 2023 N/A N/A N/A N/A 2017 c Yes Yes Yes Temperature Cycle 1010 N/A Cond B Cond C Cond C Constant Acceleration 2001, Y1 Axis N/A 500 Gs 3000 Gs 3000 Gs PIND 2020 N/A N/A N/A N/A 48 hrs@hi temp Burn-In 1015 N/A Final Electrical MIL-PRF-38534 25°C 25°C d 160 hrs@125°C 160 hrs@125°C -55°C, +25°C, -55°C, +25°C, ( Group A ) & Specification +125°C +125°C PDA MIL-PRF-38534 N/A N/A N/A 10% Seal, Fine and Gross 1014 Cond A Cond A, C Cond A, C Cond A, C Radiographic 2012 N/A External Visual 2009 c N/A N/A N/A Yes Yes Yes Notes: Best commercial practice Sample tests at low and high temperatures -55°C to +105°C for AHE, ATO, ATW Part Numbering ATS 28 05 S /CH Model Input Voltage 28 = 28V Output Voltage Single: 03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V Dual: 05 = ±5V, 12 = ±12V 15 = ±15V Screening Level (Please refer to Screening Table) No Suffix, ES, HB, CH Output S = Single D = Dual WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105 IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 01/2007 10 www.irf.com