DLA MIL-PRF-27 195 A-2008 TRANSFORMER POWER STEPDOWN《降压式电源变压器》.pdf

1、AMSC N/A FSC 5950 MIL-PRF-27/195A 18 July 2008 SUPERSEDING MIL-T-27/195 18 October 1977 PERFORMANCE SPECIFICATION SHEET TRANSFORMER, POWER, STEPDOWN This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements for acquiring the products desc

2、ribed herein shall consist of this specification and MIL-PRF-27. NOTES: 1.Dimensions are in inches. 2.Metric equivalents are given for general information only. 3. Unless otherwise specified, tolerance is .005 (.13 mm). 4.Marking shall be on the top of the case. FIGURE 1. Dimensions and configuratio

3、ns. INCH-POUNDInactive for new design after 14 February 1997 INCHES MM .003 .175 .225 .325 .350 .400 .450 .500 .525 .550 .675 .800 0.08 4.44 5.72 8.26 8.89 10.16 11.43 12.70 13.94 19.97 17.14 20.32 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-

4、PRF-27/195A 2 FIGURE 2. Pulse inductance test circuit. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/195A 3 REQUIREMENTS: (When designations or colors in parentheses, i.e., (1-2) are used, they indicate the winding and the extreme termin

5、als of the winding.) Electrical ratings: Primary voltage (1-2): 4 volts rms, 7.7 kilohertz. Primary current: 4.0 milliamperes, rms. Primary power: .15 volt ampere. Secondary voltage (5-4): 8.1 volts rms, .04 ampere rms. DC resistance: Primary (1-2): 35 ohms, maximum. Secondary (5-4): 2.15 ohms, maxi

6、mum. Working voltage: (1-2): 166 volts peak, maximum. (5-4): 33 volts peak, maximum. (1-2) to (4-5): 200 volts peak, maximum. Design and construction: Dimensions and configuration: See figure 1. Duty cycle: Continuous. Case: Encapsulated. Material: Epoxy. Weight: 3 ounces. Terminals: Pin type. Mater

7、ial: Type S, tin, lead or lead alloy coating, in accordance with A-A-59551. Height: .350 inch, minimum. Diameter: AWG 20 (.032 inch). Operating temperature range: -55C to +130C. Terminal strength: MIL-STD-202, method 211, test condition A, 2 pounds. Dielectric withstanding voltage (at sea level): 90

8、0 volts rms. Electrical characteristics: No load: With 40 volts rms and 7.7 kilohertz in (1-2): Current in (1-2): 4.0 milliamperes rms. Power in (1-2): .15 watt, maximum. Voltage across (5-4): 8.08 volts rms 1 percent. Rated load: With 40 volts rms and 7.7 kilohertz (1-2): Voltage across (5-4): 8.1

9、volts rms 10 percent. Pulse inductance: The transformer shall meet the following electrical requirements when tested under the following conditions using the test circuit in figure 2. The values shown shall be applicable to parts with a squareness ratio of 0.80 to 0.94. a. Volt-millisecond product (

10、ExT) = 2.85 5 percent at Imag 50 milliamperes 5. (For parts with a squareness ratio above 0.94, the ExT = 2.50 5 percent at Imag 50 milliamperes 5). b. Linear current (I) = 3.4 milliamperes 0.6 at time T/2. (For parts with a squareness ratio above 0.94, I = 7.0 milliamperes, maximum at time T/2.) c.

11、 I Reset = 13.3 milliamperes 10 percent. d. Pulse width (T) = 240 microseconds, nominal. (For parts with a squareness ration above 0.94, the T = 200 microseconds, nominal.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/195A 4 e. Pulse ra

12、te 200 hertz maximum. f. Pulse voltage (E1-2) = 12 volts 5 percent. g. Rise time (input pulse) = 0.5 microsecond, maximum. h. Current probe: Tektronix type 6019 with model 134 amplifier or equivalent. Polarity: Additive with terminals 2 and 5 connected. Temperature rise: 20C with 40 volts rms, 7.7 k

13、ilohertz across (1-2) at an ambient temperature of 125C. Vibration (high frequency): MIL-STD-202, method 204. Shock (specified pulse): MIL-STD-202, method 213, test condition A. VERIFICATION: Qualification inspection: Not applicable for this specification sheet. Quality conformance inspection: Group

14、s A and B tests of MIL-PRF-27 shall be applicable. Marking location: See figure 1. Part or Identifying Number (PIN): M27/195-01. Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as

15、 a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous

16、 issue. Referenced documents. In addition to MIL-PRF-27, this document references the following: MIL-STD-202 A-A-59551 Custodians: Preparing activity: Army CR DLA CC Navy EC Air Force 85 (Project 5950-2008-029) DLA - CC Review activities: Army AR, CR4, MI Navy AS, MC, OS, SH Air Force 19, 99 NOTE: T

17、he activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of this information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-