F
EATURES
• –55°C to 100°C
• 4 to 6.5, 9 to 15, or
20 to 32 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
DC/DC C
ONVERTERS
5, 12,
OR
28 V
OLT
I
NPUT
DCH SERIES
3 WATT
MODELS
VDC O
UTPUT
SINGLES
5
12
28
DUALS
±12
±15
±28
Size (max.): 0.975 x 0.800 x 0.350 inches (24.77 x 20.32 x 8.89 mm)
See section B8, case A3, for dimensions.
Weight:
20 grams typical
Screening: Standard or ES. See Section C2 for screening options,
see Section A5 for ordering information.
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
voltages of 5, 12, 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
Efficiency
DCH1215D
F
IGURE
4
Output Current vs Output Voltage
DCH1215D
F
IGURE
5
B4-31
DCH SERIES
3 WATT
DC/DC C
ONVERTERS
TYPICAL CHARACTERISTIC
Output Voltage Tolerance (Full Load)
• 5 volt output models
±0.25
• 12 volt output models ±0.4
• 15 volt output models ±0.5
• 28 volt output models ±0.6
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
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
RECOMMENDED OPERATING CONDITION
Input Voltage Range (VDC)
• 5 volt input models 4.0 to 6.5
• 12 volt input models 9.0 to 15.0
• 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.
OUTPUT
MODEL
NUMBER
INPUT
VOLTAGE
OUTPUT
VOLTAGE
1
OUTPUT
POWER
T
C
= –55°C
TO +100°C
MAX
W
MIN
%
EFFICIENCY
FULL LOAD
LOAD
REGULATION
50% TO
FULL LOAD
TYP
mV
INPUT
CURRENT
2
10% LOAD
MAX
mA
220
250
250
250
110
70
110
110
110
110
50
50
50
50
MAX
mVp-p
300
200
100
100
300
200
300
100
100
200
300
200
100
100
OUTPUT
RIPPLE
2
CURRENT
T
C
= –55°C
TO +100°C
NOMINAL
VDC
NOMINAL
VDC
MAX
mA
DCH0505S
5
5
400
2.0
67
470
DCH0512S
5
12
208
2.5
72
830
DCH0512D
5
±12
±104
2.5
72
830
DCH0515D
5
±15
±83
2.5
72
830
DCH1205S
12
5
500
2.5
70
500
DCH1212S
12
12
250
3.0
72
440
DCH1228S
12
28
107
3.0
75
870
DCH1212D
12
±12
±125
3.0
72
440
DCH1215D
12
±15
±100
3.0
72
440
DCH1228D
12
±28
±53
3.0
75
870
DCH2805S
28
5
500
2.5
68
450
DCH2812S
28
12
250
3.0
75
375
DCH2812D
28
±12
±125
3.0
75
375
DCH2815D
28
±15
±100
3.0
75
375
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
1
Negative Output
Output Common
1
Positive Output
Dot on top of cover
indicates pin one.
MODEL NUMBERING KEY
DCH
Base Model
28 12
D / ES
1 2 3
8
BOTTOM VIEW
DCH
16 15 14
9
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
Note
1. Pins 14 and 15 are connected
internally on single output
models.
See Section B8, case A3, for dimensions
F
IGURE
6: P
IN
O
UT
B4-32
24600-001-DTS Rev A
DQ# 1024
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 - 1999 Interpoint. All rights reserved.
CASE A
Dot on top of case
indicates pin one.
C
ASES
BOTTOM VIEW CASE A1
FMSA EMI Filter: Screening – Standard, ES, or 883
STF EMI Filter: Screening – Space Standard, H, or K
Seam Seal
Projection Weld
0.697
(17.70
0.397
(10.08)
CASE A
BOTTOM VIEW
0.800 max
See Figures 2 - 4
(20.32)
for pin configurations.
Squared corner and dot on
top of case indicate pin one.
1
8
2 3
4
0.975 max
(24.77)
Materials
Header
Kovar/Nickel/Gold
(Case A3, 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.
0.270 max
(6.98)
0.000
0.27
±0.02
(6.9
±0.5)
0.097
(2.46)
0.000
0.270 max
(6.86)
0.27
±0.02
(6.9
±0.5)
0.000
0.000
7
6 5
0.135 (3.43)
F
IGURE
2: C
ASE
A1
0.018
±
0.002 dia.
(0.46
±
0.05)
BOTTOM VIEW CASE A2
MCH Series: Screening – Standard, ES, or 883
SLH Series: Screening – Space Standard, H, or K
Seam Seal
Projection Weld
0.697
(17.70
0.018
±
0.002 dia.
(0.46
±
0.05)
0.097
(2.46)
0.000
0.27
±0.02
(6.9
±0.5)
0.270 max
(6.98)
0.000
0.000
0.270 max
(6.86)
0.000
0.27
±0.02
(6.9
±0.5)
7
6
5
Squared corner and dot on
top of case indicate pin one.
1 2
3
4
F
IGURE
1: C
ASE
A M
AXIMUM
D
IMENSIONS
0.135 (3.43)
0.235 (5.97)
F
IGURE
3: C
ASE
A2
BOTTOM VIEW CASE A3
DCH Series: Screening – Standard or ES
Seam Seal
Projection Weld
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
0.435 (11.05)
0.535 (13.59)
Note: Although every effort has been made to render the case
drawings at actual size, variations in the printing process may
cause some distortion. Please refer to the numerical dimensions
for accuracy.
F
IGURE
4: C
ASE
A3
B8-6
0.835 (21.21)
0.135 (3.43)
0.235 (5.97)
0.335 (8.51)
0.835 (21.21)
0.735 (18.67)
0.835 (21.21)
QA SCREENING
85°C PRODUCTS
85°C P
RODUCTS
TEST (85°C Products excluding HR products)
PRE-CAP INSPECTION
Method 2017
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. B, -55°C to 125°C
CONSTANT ACCELERATION
Method 2001, 500 g
BURN-IN
96 hours at 70°C ambient (typical)
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case
HERMETICITY TESTING
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10
-3
)
FINAL VISUAL INSPECTION
Method 2009
yes
yes
no
no
yes
yes
yes
no
yes
yes
no
yes
no
yes
no
yes
yes
yes
STANDARD
/ES
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Applies to the following products:
MFW Series
MTW Series
MHE/MLP Series
MHL Series
MRH Series
MTO Series
MSR Series
DCH Series
FM/FMA/FMB EMI Filters
MSF EMI Filter
C2-12
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