DCH SERIES
3 WATT
DC/DC CONVERTERS
OR 28 VOLT NPUT
5
I
Features
NOT RECOMMENDED FOR NEW DESIGNS
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–55°C to 100°C
5 or 28 VDC input
Fully isolated
MODELS
VDC OUTPUT
Output regulated from input side
100 kHz typical switching frequency
SINGLES
DUALS
Topology – Push-Pull DC/DC Converter
Up to 75% efficiency
5
12
±12
±15
No minimum load
Output capacitor suggested
Size (max.):
0.975 x 0.800 x 0.350 inches (24.77 x 20.32 x 8.89 mm)
See case A3 for dimensions.
Weight:
20 grams typical
Screening:
Standard or ES. See “100°C Non-QML Products
– Environmental Screening (Standard & ES)” screening table for
screening options.
DESCRIPTION
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.
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.
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.
Positive
Input
Positive
Output
+
+
FIGURE 1:
DUAL DCH CONVERTER
WITH EXTERNAL CAPACITORS
Load
Load
28 V
Output Common
Input
Common
Negative
Output
Typical Performance Curves: 25°C Tc, nominal Vin
Efficiency
DCH2805S
Output Current vs Output Voltage
DCH2805S
FIGURE 2
FIGURE 3
1