ECRI Microelectronics

M24B28M250B Mil-COTS DC DC Converters

1 Features of M24B28M250B Mil-COTS DC DC Converters

Input DC Voltage range:18~36V


Typical input DC voltage:24V

Output voltage:28V

Output power:250W

Temperature(TC):-55~100℃

Lead function:Pin-pin replacement

with similar product of Vicor


2 Application of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B DC/DC Converter is used in aerospace and high reliable electronic system.

3 Product description of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B DC-DC Converters are used by forward circuit topological structure, and combined with technology for active clamp, have the features such as high efficiency, small ripple, stable performance, convenient assembly and so on. The interior use all the potting, improve heat dissipation effect and reliability of the product.


4 Technical performance of M24B28M250B Mil-COTS DC DC Converters

Unless otherwise specified, the electrical characteristics shall be in accordance with Table2 and shall apply to the full operating temperature range.

Form 2 Rated condition and recommended condition

Absolute max rating

Recommended condition

Input voltage:40V

Output power:250W

Storage temperature:-65~105℃

Leads resistance welding temperature(10s):<300℃

Shell temperature:≤105℃

Input voltage:18~36V

Woking temperature  range(Tc):-55~100℃


Form 3 Electrical Characteristic

No.

Characteristic

Conditions

(otherwise specified,-55℃≤Tc≤125℃,VIN=24V±1.2V)

M24B28M250B

Unit

min

max

1

Output voltage Vout

TC=25℃, full load

27.5

28.5

V

2

Output current Iout

TC=25℃, full load

0

8.93

A

3

Voltage regulation rate /% Sv

18 36V,  full load

-

1

%

4

Load regulation rate /% SI

Empty load,   full load

-

1

%

5

Temperature coefficient

/% av


-0.02

0.02

%/℃

6

Efficiency  /%  η

full load

TC=25℃

82

-

%

TC=-55℃

TC=100℃

80

-

%

7

Electrical level inhibition Vinhibit

TC=25℃,Iout=1A,

No voltage, output inhibition

-

0.2

V

8

Insulation resistance Riso

TC=25℃,between two of input, output, bottom plate is 500V(DC)

10

-

9

Output ripple voltage(peak-peak)  VR

TA=25℃,BW≤20MHz,full load

-

225

mV

10

Short-circuit protection

TA=25℃,output short circuit

-

2

S


5 Circuit block diagram of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-2
Fig 2 Product elementary diagram

6. Typical characteristic curve of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-3
Fig 3  Efficiency(output power)

7.MTBF curve of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-4
Char 4  MTBF Temperature Curve
(Prediction is based on well grounded )

8 Pin Designation of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-6
Fig 5 Upward view

Form 4 lead function declaration

No.



Symbol

Function

1

+In

Inputpositive terminal

2

INH

Inhibition terminal

3

NC

Empty terminal

4

-

Input negative terminal

5

- Out

Input negative terminal

6

- S

Negative induction terminal

7

SC

Secondary-side control terminal

8

+ S

Positiveinduction terminal

9

+

Outputpositive terminal


9 Typical Connection Diagram of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-7
Fig 6  Electrical testing wiring diagram

10.Package Specifications of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-8
Fig 7 package outline drawing(upward view)

Form 5  package size parameter list

Symbol

Data/mm

Min

Typical

Min

A

12.20

-

13.50

A1

2.80

-

3.30

A2

10.65

-

12.40

Φb1

3.68

-

3.94

Φb2

1.90

-

2.16

D

57.52

-

58.28

E

43.95

-

44.95

e2

-

17.78

-

e3

-

7.62

-

e1

-

48.26

-

L

4.58

-

-

X1

16.26

-

16.76

Y1

50.55

-

51.05

d

3.17

-

3.55

Y

55.65

-

56.15


11 Ordering Information of M24B28M250B Mil-COTS DC DC Converters

M24B28M250B-10
Fig 8 Ordering Information


Application Notes:


  • The influence of external disturbance on the test accuracy should be avoided.
  • The voltage detection point should be kept at the root of the pin of the testing product.
  • Do not plug the product with electricity.
  • Before power the testing product, you must confirm the polarity of the power supply to avoid damaging products by misconnection. At the same time, please ensure that the power supply voltage and load current does not exceed using limitation of the testing product.
  • When using the shell temperature can not exceed the specified temperature, or to increase the use of heat sink.
  • When ordering this device,the detailed electrical specifications shall be based on relevant standards.


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