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1800 series
F
EATURES
•
•
•
•
Single, Dual, Triple Output
DC/DC Converter
0.400 Inch Case Profile
-55
o
C to +85
o
C Ambient Operation
Wide Input Voltage Range
Input Filter Meets Requriements of MIL-STD-461C,
MIL-STD-704D and MIL-STD-1275A
•
Meets MIL-STD-202 and MIL-STD-810 Test Conditions
•
>600,000 Hours MTBF per MIL-HDBK-217F
•
6 sided Continuous Shielding
D
ESCRIPTIONS
The 1800 series of 16W DC/DC converter modules combine innovative design techniques, conservative component selection and
stringent test standards to achieve very high levels of reliability, performance and power density. Per MIL-HDBK-217F, that MTBF
is >600,000 hours (+25
o
C Ground Benign) and greater than 125,000 hours for Airborne Inhabited. The 1800 series has been
designed specifically to meet the rigorous demands of avionics equipment. Eight models have wide 16 VDC to 36 VDC inputs,
centered on 28 VDC. Single, dual or triple output combinations of 5, 12, 15, ±5, ±12 and ±15 VDC are provided. Standard features
include 1000 VDC input/output isolation, output ripple and noise of less than 1% and continuous short circuit protection.
Efficiency is as high as 80%. A remote ON/OFF control input and internal PI filter are standard.
Long field life is insured by extensive reliability screening at Martek Power. All 1800 series units are designed to the require-
ments of MIL-STD-202 and MIL-STD-810. As part of the normal production processing, each unit is subjected to 72 hours of
burn-in with power cycling and load switching. The 1800 series converters have been qualifed and meet MIL-STD-704D
emergency power conditions for aircraft, and MIL-STD-461C and MIL-STD-1275A for EMI and transient protection.
Compliance to the EMI standards of MIL-STD-461C (including CE01 and RE01) is achieved without the need for external filter-
ing components.
Each 1800 model is packaged in a very low profile 2.56 x 3.0 x 0.4 inch metal case. Six-sided continuous shielding insures each
converter meets the requirements of VDE 0871 Class B for radiated emissions. Full operation is specified over the wide
temperature range of -55
o
C to +85
o
C with no derating or heatsinking required. Cooling is by free-air convection.
Martek Power’s 1800 series has been designed to meet the military standards applicable to avionics applications. For specific
information on test methods and/or test levels or our own reliability processing, please contact the factory. Some of the
applicable military standards include:
MIL-STD-810E This standard establishes the methods of testing the effects of natural and induced environments on equipment
used in military applications.
MIL-STD-461C This stnadard sets the design and documentation requirements for controlling the electromagnetic emission
and suseptibility characteristics of electronic equipment.
MIL-STD-202E
This standard outlines the test methods for determining a components’ resistance to the effects of natural
elements and conditions. Typically used on small components such as resistors, capacitors and transformers. Tests numbered
300 thru 399 cover electrial characteristics.
MIL-STD-1275A This standard describes the transient voltage characteristics and steady state limits for 28 VDC powered
circuits used in military vehicle.
MIL-STD-704D
This standard defines the conducted electrial power characteristics for aircraft systems at the interface
between the power system and electronic equipment. It insures the compability of aircraft electric systems and ground support
>> 1
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O
UTPUT
C
HARACTERISTICS
Voltage & Current Ratings
Output Voltage Accuracy
Single/Dual Output Models
Triple Output Models
Voltage Adjustment
3
Voltage Balance
4
Dual Outputs
Triple Outputs (Aux. Outputs)
Ripple & Noise, 20 MHz BW
Line Regulation
Single Output Models
Dual Output Models
Triple Output Models: Primary
Aux.
Load Regulation
Single Output Models
Dual Output Models
Triple Output Models:Primary
Aux.
Min. Load
Temperature Coefficient @ FL
Temperature Coefficient Balance
Transient Recovery Time
5
2
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I
NPUT
C
HARACTERISTICS
Unit/Comments
See Model Selection Guide
±1%, Max.
±4%, Max.
±5%
±2%, Max.
±4%, Max.
1% Pk-Pk of Vout
±0.5%, Max.
±0.5%, Max.
±0.5%, Max.
±1.0%, Max.
±0.5%, Max.
±1.0%, Max.
±0.5%, Max.
±1.0%, Max.
10% of Full Load
±0.02%/
o
C, Max.
±1%
100
μSec
Max. to 1%of Final
value
All outputs, by input current
limiting
See Model Selection Guide
Reverse Polarity Input Current
Short Circuit Current Limit
Overvoltage Shutdown
Undervotlage Shutdown
Transient Protection
Remote On/Off control
Supply On
Supply Off
Logic Input Reference
Logic Compability
Standby Current
Input Voltage, Nominal
Input Voltage range
1
Input Surge
Input Filter
Unit/ Comments
28 VDC
18 VDC to 36 VDC
Per Mil-STD-704D and MIL- STD-1275A
Dual input(π )Pi Network.
Differential and common mode
type. Meets the requirements of
FCC 20780 Class B for computing
dervices. Meets requirements of
MIL-STD-461C, CE01.
12A, Max.
150% of Current Input
> 50 VDC
8 VDC
600W @ 1 mSec
5.5 VDC or Open Circuit
0 VDC to 0.8 VDC
Negative (-) Input
TTL Open Collector or CMOS Open
Drain
32 mA
Short Circuit Protection
Over Voltage Protection
G
ENERAL
C
HARACTERISTICS
Efficiency
Isolation Voltage Isolation
6
Isolation Resistance
Acceleration
S
PECIFIATION
N
OTES
1
2
Shock
Vibration
Altitude
Humidity
Switching Frequency
3
4
5
6
7
= The max. input range of 16 to 50 VDC is specified for 250 mS (Per
MIL-STD-704D).
= Total output power should not exceed 16W. The load on
any auxiliary output should not exceed 500 mA.
= Outputs are adjustable on single and dual output units only.
= Voltage balance is measured with balanced loads applied.
= Transient response is measured on the primary output for a 50%
load change (50% load to full load).
= Efficiency is specified at nominal input line and full load.
= These converters have a thermal resistance of 2.1
o
C/W (Internally
dissipated). The internal thermal protection circuits are trigged if
the case temperature exceeds 95
o
C. Maintaining the module case
temp. below 95
o
C can be accomplished by mounting a low
thermal resistance heat sink (with vertically orientated fins) to the
case with a thermally conductive compond. This will significantly
increase heat transfer from the module to the ambient. Forced
convection cooling can also be used. The amount of cooling will
depend upon the flow of air in linear feer per minute (LFM) over
the module.
Unit / Comment
See Model Selection Guide
1000 VDC, Min; Primary to sec. for
1 min. per MIL-STD-202F, Method 301.
100 MOhms per MIL-STD-202F,
Method 302, Test condition B
Per MIL-STD-810E, Method 513.4,
Prodedure II. Operation test
(centrifuge) 12g’s (Manned Aerospace
Vehicles).
Per MIL-STD-810E, Method 516.4,
Procedure I. Functional shock 40g’s.
Per MIL-STD-810E, Method 514.4,
Prodedure I, Cat 6 (equipment
installed in Helicopters)
Per MIL-STD-810E, Method 500.3,
Prodedure III. Rapid decompression,
40K ft.
Per MIL-STD-810E, Method 507.3,
Procedure I. Natural non-hazardous
items, cycle 1,240 Hrs.
100 kHz, Min.
>> 2
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E
NVIRONMENTAL
S
PECIFICATIONS
Operating Temp. Range
Storage Temp. Range
Overtemperature
7
Cooling
Min Typ Max Unit/Comments
-55
+85
o
C; Ambient
-60
+125
o
C; Ambient
Protected by auto shutdown w/ an auto
restart
Meets the requirement of VDE 0871
class B for radiated emissions. ALso
meets MIL-STD-461C RE01. (see
“Shielding”)
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P
HYSICAL
C
HARACTERISTICS
Case Size
Case Material
Weight
Shielding
Shield Connection
Reliability Specifications:
MTBF; per MIL-HDBK-217F
Unit/Comments
2.56 X 3.0 X 0.40 inches
(66 X 76.2 X 10.2 mm)
Coated Copper
4 oz (113g)
Six-sided, Continuous
Pin 3 (- Input)
Ground, @+25
o
C Ambient -
616,846 Hrs.
Ground Fixed, @ +25
o
C Ambient -
250,000 Hrs.
O
UTLINE
D
RAWING
P
IN
O
UT
C
HART
; C
ASE
A
Pin
Single
Dual
1 Remote On/Off Remote On/Off
2
+ Input
+ Input
3
- Input
- Input
4
Sync
Sync
5 + Output Sense
+ Output
6
Trim
Common
7 - Output Sense
- Output
8
+ Output
Output Trim
9
- Output
No Pin
10
No Pin
No Pin
Triple
Remote On/Off
+ Input
- Input
Sync
+ Output (Aux)
Common (Aux)
-Output (Aux)
+ 5V Output
-5V Output
Output Trim(5V)
Notes:
For proper operation of a single output unit without sensing or external trimming, connect + Output Sense
(Pin 5) to + Output (Pin 8) and - Output Sense (Pin 7) to - Output (Pin 9)
All dimensions are typical in inches (mm)
Tolerance:
Inches
mm
X.XX = ±0.02
X.X = ±0.5
X.XXX= ±0.010
X.XX = ±0.25
Mounting inserts are 4-40x .10(2.5) Deep
All specifications are typical at nominal input, nominal load and 25
°
C unless otherwise specified.
External, low ESR, 10 microfarad (minimum) capacitor across output is recommended for operation.
>> 3
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H
OW
T
O
O
RDER
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H
OW TO
O
RDER
18 XX D XX - Y
Series Number
Output Voltage
Output Configuration
(S=Single, D=Dual)
RoHS Compliant
Nominal
Input Voltage
18 XX /15
Series Number
Output Voltage
Aux Output
Voltage
T
XX - Y
RoHS Compliant
Nom Input Voltage
Output Config
(T= Triple)
M
ODEL
S
ELECTION
C
HART
Model
Nominal
Input
Voltage
(VDC)
28
28
28
28
28
28
28
28
Input
Voltage
Range
(VDC)
16 - 36
16 - 36
16 - 36
16 - 36
16 - 36
16 - 36
16 - 36
16 - 36
No Load
Input
Current
(mA)
50
50
50
50
50
50
50
50
Full Load
Input
Current
(mA)
730
730
730
730
730
730
730
730
Output
Voltage
(VDC)
5
12
15
±5
±12
±15
5/±12
5/±15
Output
Current
(mA)
3200
1330
1067
±1600
±670
±530
2000/±250
2000/±200
Output
Over
Voltage
(VDC)
6.8
15.0
18.0
±6.8
±15.0
±18.0
6.8/±15.0
6.8/±18.0
Efficiency
@ FL
(%)
78
78
78
78
80
80
78
78
1805S28
1812S28
1815S28
1805D28
1812D28
1815D28
1805/12T28
1805/15T28
>> 4
Wireless Connectivity
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