DC/DC C
ONVERTERS
5
OR
28 V
OLT
I
NPUT
Features
•
•
•
•
•
•
•
•
•
–55°C to 100°C
5 or 28 VDC input
Fully isolated
Output regulated from input side
100 kHz typical switching frequency
Topology – Push-Pull DC/DC Converter
Up to 75% efficiency
No minimum load
Output capacitor suggested
MODELS
VDC O
UTPUT
SINGLES
DCH SERIES
3 WATT
NOT RECOMMENDED FOR NEW DESIGNS
DUALS
5
12
±12
±15
Size (max.):
Weight:
Screening:
0.975 x 0.800 x 0.350 inches (24.77 x 20.32 x 8.89 mm)
See case A3 for dimensions.
20 grams typical
Standard or ES. See “100°C Non-QML Products
– Environmental Screening (Standard & ES)” screening table for
screening options.
DESCRIPTION
The DCH Series™ offers isolated, unregulated DC/DC converters
with up to 3 watts of output power in a low profile (0.350 max.) metal
package. Single and dual output models are available with input volt-
ages of 5 or 28 VDC. DCH Series converters operate over a –55°C to
+100°C temperature range.
DCH Series converters use a non-saturating core circuit operating at
a frequency of approximately 100 kHz, which reduces reflected input
ripple and minimizes EMI/RFI problems. For applications requiring
MIL-STD-461C, CEO3, reflected input ripple levels, refer to Section B5
or contact your Interpoint representative for matching EMI filters.
Figure 1 shows a standard connection scheme for a dual output
model. Users may also elect to use a dual output device to provide a
single output at double the rated output voltage. The double voltage
connection is achieved by leaving the normal output common pin (Pin
15) unconnected and using either the positive or negative Vout pin for
the output common connection.
On all DCH Series models, a tantalum capacitor with a minimum
value of 22
μF
and an appropriate voltage rating should be connected
between the output common and the output line(s) to minimize output
ripple.
F
IGURE
1:
D
UAL
DCH C
ONVERTER
WITH
E
XTERNAL
C
APACITORS
Positive
Input
28 V
Positive
Output
Output Common
+
+
Load
Load
Input
Common
Negative
Output
Typical Performance Curves: 25°C Tc, nominal Vin
Efficiency
DCH2805S
F
IGURE
2
Output Current vs Output Voltage
DCH2805S
F
IGURE
3
1
DC/DC C
ONVERTERS
ABSOLUTE MAXIMUM RATING
Output Power
• 3 watts
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –55°C to +125°C
DCH SERIES
3 WATT
TYPICAL CHARACTERISTICS
Output Voltage Tolerance (Full Load)
• 5 volt output models ±0.25
• 15 volt output models ±0.5
Line Regulation
• Output is directly proportional to input voltage.
Output Voltage Temperature Coefficient
• 0.02%/°C maximum
Converter Frequency
• 100 kHz typical
Isolation
• 100 megohm minimum at 500 V
RECOMMENDED OPERATING CONDITION
Input Voltage Range (VDC)
• 5 volt input models
4.0 to 6.5
• 28 volt input models
20.0 to 32.0
Case Operating Temperature (Tc)
• –55°C to +100°C full power
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
INPUT
VOLTAGE
OUTPUT
VOLTAGE
OUTPUT
CURRENT
NOMINAL VDC
TC = -55°C TO
+100°C MAX
OUTPUT
CURRENT
NOMINAL VDC
TC = -55°C TO
+100°C MAX
EFFICIENCY
FULL LOAD
MODEL
NUMBER
DCH0505S
DCH0512S
DCH0512D
DCH0515D
DCH2805S
DCH2812S
DCH2812D
DCH2815D
NOMINAL
VDC
5
5
5
5
28
28
28
28
NOMINAL
VDC
5
12
±12
±15
5
12
±12
±15
mA
400
208
±104
±83
500
250
±125
±100
W
2.0
2.5
2.5
2.5
2.5
3.0
3.0
3.0
MIN
%
67
72
72
72
68
75
75
75
LOAD
REGULATION
50% TO FULL
LOAD
TYP
mV
470
830
830
830
450
375
375
375
INPUT
CURRENT
2
10% LOAD
MAX
mA
220
250
250
250
50
50
50
50
OUTPUT
RIPPLE
MAX
mV-pp
300
200
100
100
300
200
100
100
Notes
1. Nominal output voltage is correct only for nominal input voltage. Output voltage changes in proportion to input voltage.
2. Output ripple results require the connection of a tantalum capacitor (22
μF
minimum) across each output.
PIN OUT
Pin
1
2
3
8
9
14
15
16
Designation
Positive Input
No Connection
Input Common
No Connection
Case
Negative Output
1
Output Common
1
Positive Output
Dot on top of cover
indicates pin one.
MODEL NUMBERING KEY
DCH
1 2 3
8
28 12
D / ES
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
BOTTOM VIEW
DCH
16 15 14
9
Note
1. Pins 14 and 15 are connected inter-
nally on single output models.
See case A3 for dimensions
F
IGURE
6: P
IN
O
UT
2
DC/DC C
ONVERTERS
DCH SERIES
3 WATT
BOTTOM VIEW CASE A3
Seam Seal
Projection Weld
0.805 max (20.45)
0.697 (17.70)
0.018 ± 0.002 dia.
(0.46 ± 0.05)
0.097
(2.46)
0.000
0.000
0.000
0.350 max
(8.89)
0.27 ±0.02
(6.9 ±0.5)
0.350 max
(8.89)
0.000
0.27 ±0.02
(6.9 ±0.5)
16 15 14
9
Dot on top of case
indicates pin one.
1 2 3
8
Seal hole: 0.056 ±0.002 (1.42 ±0.05)
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
Materials
Header
Kovar/Nickel
Cover
Kovar/Nickel
Pins
Kovar/Nickel/Gold, matched glass seal
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device.
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin.
Case A3, Rev C, 20060731
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2006 Interpoint Corp. All rights reserved.
F
IGURE
7: C
ASE
A3
0.980 max (24.89)
0.135 (3.43)
0.235 (5.97)
0.335 (8.51)
0.835 (21.21)
3
DC/DC C
ONVERTERS
100°C N
ON
-QML P
RODUCTS
—
E
NVIRONMENTAL
S
CREENING
(S
TANDARD
& ES)
TEST
100°C
STANDARD
non QML
Pre-cap Inspection
Method 2017, 2032
Temperature Cycle (10 times)
Method 1010, Cond. B, -55°C to 125°C ambient
Constant Acceleration
Method 2001, 500 g
Burn-In
96 hours, typical case temperature 100°C case
Final Electrical Test MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case
Hermeticity Test
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10 )
Final Visual Inspection
Method 2009
yes
yes
-3
2
1
DCH SERIES
3 WATT
100°C
/ES
non QML
1
yes
no
no
no
yes
no
no
yes
yes
yes
yes
yes
yes
yes
yes
no
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. Non-QML products do not meet all of the requirements of MIL-PRF-38534
2. Burn-in is still air with an ambient temperature designed to bring the case temperature to
100°C
24600-001-DTS Rev B
All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint
reserves the right to make changes in products or specifications without notice. DCH Series is a trademark of Interpoint.
Copyright © 1991 - 2006 Interpoint. All rights reserved.
4
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