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GS-RXXX12
December 2004
This is preliminary information on a new product in development or undergoing evaluation. Details are subject to change without notice.
Rev. 1
FEATURES
MODULE DC/DC STEP DOWN SINGLE
OUTPUT
WIDE RANGE INPUT VOLTAGE 100
370 V
dc
OUTPUT POWER 1.8W, 4.5W OR 12W MAX
OUTPUT VOLTAGE PRECISION 5% FOR
4.5W AND 12W
OUTPUT VOLTAGE PRECISION 10% FOR
1.8W
OUTPUT SHORT CIRCUIT PROTECTION
DESCRIPTION
The DC/DC module is a high efficiency DC/DC not in-
sulated switch mode constant voltage generator.
Designed for industrial application where low voltag-
es are required from main.
Step down converter performs a max 1.8W, 4.5 W
and 12W power conversion.
The output voltages and current level are set up by
design in accordance with customer requirements.
Typical reference values for the shelf solution are:
-single output -12V,
10%, 0.15A for 1.8W;
-single output -12V,
5%, 0.35A for 4.5W;
-single output -12V,
5%, 1A for 12W.
Power Module VIP 1.8W
Power Module VIP 4.5W
Power Module SM 12W
PRELIMINARY DATA
DC/DC STEP DOWN POWER SUPPLY
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Figure 1. Application Diagram for 1.8W and 4.5W
Figure 2. Application Diagram for 12W
L1
N1
-12V
RTN
POWER MODULE
SAFETY COMPLIANCE)
(RECOMMENDED FOR
1A FUSE
SAFETY COMPLIANCE)
(RECOMMENDED FOR
1A FUSE
N1
L1
(NOT NEEDED FOR
EUROPEAN BUS)
33F
POWER MODULE
RTN
-12V
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Table 1. Electrical Characteristics (T
amb
=25
)
C, unless otherwise specified.)
AGENCY APPROVALS
The safety and EMI compliance has to be assured by the user.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
i
Input Voltage
Output Power 1.8W, 4.5W and 12W
100
370
V
dc
V
o1
Output Voltage
V
i
= 100 to 370 V
dc
for 4.5W and 12W
-12.6
-12
-11.4
V
V
o2
Output Voltage
V
i
= 100 to 370 V
dc
for 1.8W
-10.8
-12
-13.2
V
I
o1
Output Current
V
i
= 100 to 370 V
dc
for 1.8W
0.15
A
I
o2
Output Current
V
i
= 100 to 370 V
dc
for 4.5W
0.35
A
I
o3
Output Current
V
i
= 100 to 370 V
dc
for 12W
1
A
V
or
Output Ripple
V
i
= 100 to 370 V
dc
5%
mVpp
I
osc
Output short circuit current
V
i
= 100 to 370 V
dc
Hiccup Mode
A
n
Efficiency
V
i
= 100 to 370 V
dc
I
o
=0.15 A for 1.8W
70
%
n
Efficiency
V
i
= 100 to 370 V
dc
I
o
=0.35 A for 4.5W
80
%
n
Efficiency
V
i
= 100 to 370 V
dc
I
o
=1 A for 12W
83
%
P
stand by
Power losses in no load
condition
V
i
= 320 V
dc
I
o
= 0 mA
0.3
W
I
ir
Inrush input current
V
i
= 320 V
dc
30
A
T
op
Operating Ambient
Temperature
0
70
C
T
stg
Storage Temperature Range
-20
85
C
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Figure 3. Mechanical Data for 1.8W (dimensions in mm)
Figure 4. Mechanical Data for 4.5W (dimensions in mm)
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Figure 5. Mechanical Data for 12W (dimensions in mm)
Figure 6. Mechanical Data for 1.8W (dimensions in mm)
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Figure 7. Mechanical Data for 4.5W (dimensions in mm)
Figure 8. Mechanical Data for 12W (dimensions in mm)
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Figure 9. Mechanical Data (dimensions in mm)
Figure 10. Ordering Information Scheme
G S - R x . x x 1 2 y y y
Output Current
0.15
0.35
1.00
Output Voltage
VIP
VIP
SM
Table 2. Revision History
Date
Revision
Description of Changes
14-Dec.-2004
1
First Release
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to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
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GS-RXXX12
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