Data Sheet
June 1997
DC025 Triple Output-Series Power Modules:
18 Vdc to 36 Vdc Input; 25 W
Options
■
■
Higher accuracy output voltage clamp set point
Short pins: 2.79 mm ± 0.25 mm
(0.110 in. ± 0.010 in.)
Heat sink available for extended operation
Negative logic remote on/off
■
■
Description
The DC025 Triple Output-Series Power Modules are
dc-dc converters that operate over an input voltage
range of 18 Vdc to 36 Vdc and provide three outputs.
These modules offer extremely low noise levels with
industry-standard pinouts in a small footprint. Each
highly reliable and efficient unit features remote
on/off and current limit.
The maximum total output power of the DC025 Triple
Output-Series Power Modules is limited to 25 W. The
main output (V
O1
) is designed to deliver the entire
25 W. The auxiliary outputs (V
O2
and V
O3
) can pro-
vide a total of 22.5 W as long as the total output
power does not exceed 25 W.
Efficiency greater than 80%, a wide operating tem-
perature range, and a metal case are additional fea-
tures of these modules.
The DC025 Triple Output-Series Power Modules use
advanced, surface-mount technology and deliver high-quality,
compact, dc-dc conversion at an economical price.
Features
■
Small size: 71.1 mm x 61.0 mm x 12.7 mm
(2.80 in. x 2.40 in. x 0.50 in.)
Low output noise
Industry-standard pinout
Metal case with separate case ground pin
2:1 input voltage range
Remote on/off (positive logic)
■
■
■
■
■
■
UL*
Recognized,
CSA
†
Certified, and VDE
Licensed
Within FCC and CISPR Class A Radiated Limits
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
CSA
is a registered trademark of Canadian Standards Associa-
tion.
■
Applications
■
■
Distributed power architectures
Telecommunications
DC025 Triple Output-Series Power Modules:
18 Vdc to 36 Vdc Input; 25 W
Data Sheet
June 1997
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Input Voltage Continuous
I/O Isolation Voltage:
dc
Transient (1 minute)
Operating Case Temperature
Storage Temperature
Symbol
V
I
—
—
T
C
T
stg
Min
—
—
—
– 40
– 55
Max
50
500
850
100
125
Unit
V
V
V
°C
°C
Electrical Specifications
Unless otherwise indicated, specifications apply to all modules over all operating input voltage, resistive load, and
temperature conditions.
Table 1. Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current
(V
I
= 0 V to 36 V; I
O
= I
O, max
; see Figure 1.)
Inrush Transient
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
T
C
= 25 °C; see Figure 18 and Design
Considerations section.)
Input Ripple Rejection (120 Hz)
Symbol
V
I
I
I, max
i
2
t
—
Min
18
—
—
—
Typ
28
—
—
30
Max
36
3.0
0.2
—
Unit
Vdc
A
A
2
s
mAp-p
—
—
60
—
dB
Fusing Considerations
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone
operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fus-
ing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow, dc fuse with a maximum rating of 5 A in series with the ungrounded input
lead. Based on the information provided in this data sheet on inrush energy and maximum dc input current, the
same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.
2
Tyco Electronics Corp.
Data Sheet
June 1997
DC025 Triple Output-Series Power Modules:
18 Vdc to 36 Vdc Input; 25 W
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter
Output Voltage
(Over all operating input voltage, resistive
load, and temperature conditions until end
of life. See Figure 20.)
Device
DC025ABK-M
Symbol
V
O1
V
O2
V
O3
V
O1
V
O2
V
O3
V
O1, set
V
O2, set
V
O3, set
V
O1, set
V
O2, set
V
O3, set
—
V
O1
V
O1
Min
4.80
10.80
–10.80
4.80
13.77
–13.77
4.90
11.83
–11.83
4.90
14.84
–14.84
—
—
—
Typ
—
—
—
—
—
—
5.00
12.20
–12.20
5.00
15.30
–15.30
0.1
0.1
0.5
Max
5.20
13.70
–13.70
5.20
17.20
–17.20
5.10
12.57
–12.57
5.10
15.76
–15.76
0.2
0.2
1.5
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
%
%
%
DC025ACL-M
Output Voltage Set Point
(V
I
= 28 V; T
C
= 25 °C; I
O1
= 2.0 A,
I
O2
= I
O3
= 0.5 A)
DC025ABK-M
DC025ACL-M
Output Regulation:
Line (V
I
= 18 V to 36 V)
Load (See Figures 5—8.)
(I
O1
= I
O, min
to I
O, max,
I
O2
= I
O3
= I
O, min
)
Temperature (See Figures 2—4.)
(T
C
= –40 °C to +100 °C)
Output Ripple and Noise
(See Figure 19.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
Output Current
(At I
O
< I
O, min
, the modules may exceed
output ripple specifications.)
Output Current-limit Inception
(V
O
= 90% of V
O, nom
and minimum load on
other outputs. See Figures 9—12.)
Output Short-circuit Current
(V
O
= 1 V and minimum load on other
outputs.)
Efficiency
(V
I
= 28 V; T
C
= 25 °C; see Figures 13, 14,
and 20.):
I
O1
= 2.5 A, I
O2
= I
O3
= 0.5 A
I
O1
= 2.0 A, I
O2
= I
O3
= 0.5 A
All
All
All
All
All
DC025ABK-M
DC025ACL-M
DC025ABK-M
DC025ACL-M
DC025ABK-M
DC025ACL-M
V
O1
V
O2,
V
O3
V
O1
V
O2,
V
O3
I
O1
I
O2,
I
O3
I
O1
I
O2,
I
O3
I
O1
I
O2,
I
O3
I
O1
I
O2,
I
O3
I
O1
I
O2,
I
O3
I
O1
I
O2,
I
O3
—
—
—
—
0.5
0.1
0.5
0.1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
6
2
6
2
8
3
8
3
25
30
100
150
5.0
1.0
5.0
0.83
7.5
3.0
7.5
3.0
10.5
4.5
10.5
4.5
mVrms
mVrms
mVp-p
mVp-p
A
A
A
A
A
A
A
A
A
A
A
A
DC025ABK-M
DC025ACL-M
η
η
79
79
82
82
—
—
%
%
Tyco Electronics Corp.
3
DC025 Triple Output-Series Power Modules:
18 Vdc to 36 Vdc Input; 25 W
Data Sheet
June 1997
Electrical Specifications
(continued)
Table 2. Output Specifications
(continued)
Parameter
Dynamic Response
(½I
O
/½t = 1 A/10 µs, V
I
= 28 V, T
C
= 25 °C):
Load Change from I
O
= 50% to 75% of
I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% peak
deviation)
Load Change from I
O
= 50% to 25% of
I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% peak
deviation)
Table 3. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Min
—
10
Typ
0.02
—
Max
—
—
Unit
µF
MΩ
Device
Symbol
Min
Typ
Max
Unit
All
All
V
O1
—
—
—
80
1
—
—
mV
ms
All
All
V
O1
—
—
—
80
0.5
—
—
mV
ms
General Specifications
Parameter
Calculated MTBF (I
O
= 80% of I
O, max
; T
C
= 40 °C)
Weight
—
Min
Typ
2,906,000
—
113 (4.0)
Max
Unit
hours
g (oz.)
4
Tyco Electronics Corp.
Data Sheet
June 1997
DC025 Triple Output-Series Power Modules:
18 Vdc to 36 Vdc Input; 25 W
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions and Design Considerations for further information.
Parameter
Remote On/Off
(V
I
= 0 V to 36 V; open collector or equivalent
compatible; signal referenced to V
I
(–) terminal.
See Figures 17 and 21 and Feature
Descriptions.):
DC025XXX-M (positive logic):
Logic Low—Module Off
Logic High—Module On
DC025XXX1-M (negative logic):
Logic Low—Module On
Logic High—Module Off
Module Specifications:
On/Off Current—Logic Low
On/Off Voltage:
Logic Low
Logic High (I
on/off
= 0)
Open Collector Switch Specifications:
Leakage Current During Logic High
(V
on/off
= 10 V)
Output Low Voltage During Logic Low
(I
on/off
= 1 mA)
Turn-on Time
(I
O
= 80% of I
O, max
; V
O
within ±1% of steady
state)
Output Voltage Overshoot (See Figure 17.)
Output Overvoltage Clamp
Device
Symbol
Min
Typ
Max
Unit
All
All
All
All
All
All
I
on/off
V
on/off
V
on/off
I
on/off
V
on/off
—
—
0
—
—
—
—
—
—
—
—
—
5
1.0
1.2
10
50
1.2
—
mA
V
V
µA
V
ms
All
DC025ABK-M
—
V
O1
V
O2
V
O3
V
O1
V
O2
V
O3
—
—
—
—
—
—
—
—
90
0
6
15
–15
6
19
–19
—
5
6.8
17
–17
6.8
21
–21
110
%
V
V
V
V
V
V
% V
O, nom
DC025ACL-M
Output Voltage Set-point Adjustment Range
All
Tyco Electronics Corp.
5
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