SIS12X DC-DC Series Preliminary Data Sheet
12A Non-Isolated Converter
Features
•
•
•
•
•
•
Through-hole mount configuration
Single output
Efficiency in excess of 88%
Output overcurrent protection
Remote on/off
Output voltage trim
Description
SIS12X
converters are through-hole-mount, low-cost, non-isolated single-output DC-DC converters. The products
provide point-of-load conversion of a single 12V input voltage into a regulated low output voltage with up to 12A of
output current. The converters also feature remote on/off and output trim functions. High efficiency, low cost, high
reliability and the board-saving vertical mounting option make these converters an excellent choice for powering
ASICs in a distributed power architecture.
Models
SIS12XE
SIS12XD
SIS12X2.1
SIS12XB
SIS12XA
Input Voltage
(VDC)
10.8 ~ 13.2
10.8 ~ 13.2
10.8 ~ 13.2
10.8 ~ 13.2
10.8 ~ 13.2
Output Voltage
(VDC)
3.3
2.5
2.1
1.8
1.5
Efficiency (%)
Typical at I
o
, Rated
88
86
84
81
78
NOTE: Model numbers highlighted in yellow or shaded are not recommended for new designs.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long-
term reliability, and cause permanent damage to the converter.
Parameter
Input Voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Referenced to GND
Conditions/Description
Full Load
Min
10.8
1
-40
-40
Max
13.2
+55
+125
5.5
Units
VDC
°C
°C
VDC
Note: A minimum 100 µF input tantalum capacitor parallel with 10µF ceramic capacitor( ESR=10mΩ ) is needed to operate the converters
down to –40ºC. For 0ºC and above operation, a 100µF input tantalum capacitor parallel with 10uF ceramic capacitor( ESR=10mΩ ) is
recommended near the input pin of the unit to enhance the performance although the unit will not be damaged (by the input ripple current)
without the capacitor, the ceramic capacitor should be located near the input pin not far as 5mm.
REV. FEB 06, 2004
1
Page 1 of 5
SIS12X DC-DC Series Preliminary Data Sheet
12A Non-Isolated Converter
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted.
Parameter
Shock
Sinusoidal Vibration
Weight
Water Washing
MTBF
Conditions/Description
Half sine wave, 3 axes
GR-63-Core, Section 5.A.2
Standard process
Per Bell core TR-NWT-000332
Min
50
1
Nom
Max
Units
g
Oz/g
MHrs
0.2/5.7
Yes
5.4
Isolation Specifications
The SIS12X Series does not provide input-to-output isolation.
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage (continuous)
Turn-On Input Voltage
Under Voltage Lock out
Turn-On Time
Inrush Transient
External Capacitor (required)
Conditions/Description
Min
10.8
8.2
To Output Regulation Band
100% Resistive Load
Vin=Vin.max. Io=12A
ESR < 0.01 Ohm
12
0.04
100
2
Nom
12
Max
13.2
10.4
15
Units
VDC
VDC
VDC
ms
As
µF
2
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Output Voltage Set point Accuracy
Output Current Range
Line Regulation
Load Regulation
Total output voltage regulation
Dynamic Regulation:
Peak Deviation
Settling Time
Admissible Load Capacitance
Output Current Limit Threshold
Switching Frequency
Temperature Coefficient
4
Conditions/Description
Vin.nom, 50% Load
Vin.min to Vin max at Io,rated
At Vin nom, Iout.0A to 12A
Over all input voltage, load, and
temperature conditions
50-25-50% load step change
Min
-1.5
3
0
Nom
Max
1.5
12
1.0
0.5
3.0
Units
%Vout
ADC
%Vout
%Vout
%Vout
+/-20
30
Vin nom, Io,rated
Vout≤0.95Vout.nom
2000
115
185
200
+/-50
200
150
215
0.01
40
mVp-p
µs
µF
%Io,rated
kHz
%/°C
mVrms
Output Ripple and Noise
Trim Range
5
External Capacitor (required)
Vin nom, Io,rated
Vin nom, Io,rated
90
100
25
110
%Vout
µF
2
3
Please see note 1 in the previous page.
At Io,min, the output may contain low frequency component that exceeds ripple specifications.
4
Current fold back at constant current load with self-recovery.
5
External capacitor to enhance stability, type of capacitor depends on the life required.
REV. FEB 06, 2004
Page 2 of 5
SIS12X DC-DC Series Preliminary Data Sheet
12A Non-Isolated Converter
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Shutdown (ON/OFF)
Logic Low
Logic High or floating
Open circuit voltage
Conditions/Description
On/Off signal low – converter is OFF
On/Off signal high or floating– converter is
ON
Min
0
Vin_ min
Vin
Nom
Max
0.5
Vin_ma
x
Units
VDC
Characteristic Curves
SIS12XE. EFF. VS. LOAD RESPONSE
ceramic capacitor with ESR < 10mΩ be used across
the input and input return, of the SIS12X converters
to ensure optimized performance.
If the magnitude of the inrush current needs to be
limited, see the “Inrush Current Control Application
Note” on www.power-one.com.
Shutdown Feature Description
The ON/OFF pin in the SIS12X converters functions
as a normal soft shutdown. It is referenced to the
GND pin (see Figure 2). When the ON/OFF pin is
pulled low to within 0.5Vdc reference to the ground,
the output is turned OFF and the unit goes into a
very low input power mode.
100
95
90
EFFICIENCY %
85
80
75
70
10
20
30
40
50
LOAD %
60
70
80
90
100
EFF.(10.5V)
EFF.(12V)
EFF.(13.5V)
When the pin is left floating or pulled high to Vin, the
unit is ON and operates normally.
An open collector switch is recommended to control
the voltage between the ON/OFF pin and the GND
pin of the converter. The ON/OFF pin is pulled up
internally, so no external voltage source is required.
The user should avoid connecting a resistor
between the ON/OFF pin and the +Vin pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the pin
reference for the control is really the GND pin. The
control signal must not be referenced ahead of EMI
filtering, or remotely from the unit. Optically coupling
the information and locating the optical coupler
directly at the module will solve any of these
problems.
Output Voltage Trim
The trim feature allows the user to adjust each of the
output voltages by ±10% from the nominal. This can
be used to compensate distribution drops, perform
margining in production, or accommodate other
Figure 1. SIS12XE Efficiency vs. Output Load
Typical Application
Figure 2 shows the recommended connections for
the SIS12X converter.
SIS12VX
Trim
Vin+
ON/OFF
Output
SIS12XX
Sense+
100uF
25V
10uF
25V
Ceramic
100uF
6V
Figure 2. Typical Application of SIS12X Series
It is recommended that a minimum of a 100µF
capacitor with an ESR <0.1Ω parallel with a 10uF
REV. FEB 06, 2004
Page 3 of 5
SIS12X DC-DC Series Preliminary Data Sheet
12A Non-Isolated Converter
input devices to the SIS12X series module.
Nevertheless, if the system using the converter
needs to receive safety agency approval, certain
rules must be followed in the design of the system.
In particular, all of the creepage and clearance
requirements of the end-use safety requirements
must be observed.
These documents include
UL60950 - CSA60950-00 and EN60950, although
specific applications may have other or additional
requirements.
The SIS12X converters have
no internal fuse.
An
external fuse must be provided to protect the system
from catastrophic failure. A fuse with a rating not
greater than 10A, 125V is recommended. The user
can select a lower rating fuse based upon the inrush
transient and the maximum input current of the
converter, which occurs at the minimum input
voltage. Both input traces and the chassis ground
trace (if applicable) must be capable of conducting a
current of 1.5 times the value of the fuse without
opening. The fuse must not be placed in the
grounded input line, if any.
In order for the output of the SIS12X converter to be
considered as SELV (Safety Extra Low Voltage),
according to all IEC60950 based standards, the input
to the module needs to be supplied by an isolated
secondary source providing a SELV also.
Thermal Considerations
The SIS12X converters are designed for natural or
forced convection cooling. The output power of the
converters is determined by the maximum
semiconductor junction temperature. To provide
reliable long-term operation of the converters,
Power-One limits maximum allowable junction
temperature to 120°C.
The graphs in Figures 4 show the maximum output
current of the SIS12X converters at different local
ambient temperatures at both natural and forced
(longitudinal airflow direction, from pin 3 to pin 1)
convection.
requirements when output voltage needs to be
adjusted from the nominal
The Trim Function
The trim mechanism for the SIS12X is a negative
one. The output is trimmed up with a resistor from
the TRIM pin to the GND pin and trimmed down with
a resistor from the TRIM pin to the respective +Vout
pin.
6,7
Vo
R
trim,down
TRIM
R
trim,up
Figure 3. SIS12X Series Trim Up / Down Schematic
The general equation for trimming the output voltage
on the output as shown below:
R
trim
,
UP
=
R
1 * 0.8
−
2
Vadj
−
Vout
kOhm
R
trim
,
DOWN
=
R1
(
Vadj
−
0.8) *
R
1
−
2
Vout
−
Vadj
kOhm
kOhm for SIS12XE;
kOhm for SIS12X2.1;
kOhm for SIS12XY.
Safety Considerations
SIS12X converters do
not provide isolation
from
input-to-output.
Relevant isolation requirements according to all
IEC60950 based standards must be provided by the
When the output voltage is trimmed up, the output power from
the converter must not exceed its maximum rating. This is
determined by measuring the output voltage on the output pins,
and multiplying it by the output current.
In order to avoid creating apparent load regulation degradation, it
is important that the trim resistors are connected directly to the
Vout and output GND pins, and not to the load or to traces going
to the load.
REV. FEB 06, 2004
7
6
Figure 4.
SIS12XE Derating Curves (To be Added)
Page 4 of 5
SIS12X DC-DC Series Preliminary Data Sheet
12A Non-Isolated Converter
Mechanical Drawing
Dimensions shown in inches (millimeters)
Tolerances:
.xx
±
0.020” (0.5mm)
.xxx
±
0.010” (0.25mm)
(a). Vertical Mount Option
P in
1
2
3
4
5
6
7
8
9
10
11
12
F u n c ti o n
V o+
V o+
V o+ sens e
V o+
GND
GND
GND
V in +
V in +
V in +
t rim
O N /O F F
(b). Horizontal Mount Option
Figure 5.
SIS12X Series Mechanical Data
Note:
Consult factory for the complete list of available options.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not authorized for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional
president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
REV. FEB 06, 2004
Page 5 of 5
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