Data Sheet - Bel Fuse Inc.

NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
SLAN-12D2Ax
RoHS Compliant
Rev.A
Features

Non-Isolated

Cost efficient open frame design

Power Good signal

Ability to sink and source current

Remote On/Off

DOSA based

Overtemperature protection

Fixed switching frequency

Compliant to IPC-9592 (September 2008), Category 2, Class II

Compliant to RoHS EU Directive 2002/95/EC (Z versions)

Compatible in a Pb-free or SnPb reflow environment (Z versions)

Output voltage programmable from 0.6Vdc to 5.5Vdc via external resistor.

Tunable Loop

Output overcurrent protection (non-latching)

Wide operating temperature range [-40°C to 85°C]

Wide Input voltage range (3Vdc-14.4Vdc).

UL* 60950-1Recognized, CSA C22.2 No. 60950-1-03 Certified, and VDE 0805:2001-12 (EN60950-1) Licensed

Small size:12.2mm×12.2mm×8.5mm(0.48 in×0.48 in×0.335 in)

ISO** 9001 and ISO 14001 certified manufacturing facilities
TM
to optimize dynamic output voltage response
†
‡
Applications

Distributed power architectures

Servers and storage applications

Intermediate bus voltage applications

Networking equipment

Telecommunications equipment

Industrial equipment
Description
The SLAN-12D2Ax modules are non-isolated dc-dc converters that can deliver up to 12A of output current.
These modules operate over a wide range of input voltage (VIN = 3Vdc-14.4Vdc) and provide a precisely
regulated output voltage from 0.6Vdc to 5.5Vdc, programmable via an external resistor. Features include remote
TM
On/Off, adjustable output voltage, over current and over temperature protection. The Tunable Loop feature
allows the user to optimize the dynamic response of the converter to match the load with reduced amount of
output capacitance leading to savings on cost and PWB area.
Part Selection
Output Voltage
Input Voltage
0.6 - 5.5 Vdc
3 - 14.4 Vdc
Max. Output
Current
12 A
Max. Output
Power
66W
Typical
Efficiency
95%
Model Number
Active High
SLAN-12D2A0
Model Number
Active Low
SLAN-12D2AL
Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
1
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Part Number Explanation
S LAN – 12 D 2A 0
1
2
3
4
5
6
1---Surface mount
2---Series code
3---Output current (12A)
4---Wide input voltage range (3-14.4V)
5--- Without sequencing
6---Enable, active high, change “0” to “L”
means active low；
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Unit
Continuous Input Voltage
-0.3
-
15
V
Operating Ambient Temperature
-40
TA
85
C
Notes
see Thermal Considerations section
C
Note: Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute
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
the device reliability.
Storage Temperature
-55
Tstg
125
Input Specifications
Min
Typ
Max
Unit
Operating Input Voltage
Parameter
3
-
14.4
V
Input Current (full load)
-
-
12
A
-
45
-
mA
VO,set = 0.6 Vdc
-
75
-
mA
VO,set = 5 Vdc
Input Stand-by Current
-
0.65
-
mA
Input Reflected Ripple Current
(pk-pk)
-
40
-
mAp-p
I t Inrush Current Transient
-
-
1
As
VIN = 12V, module disabled
5Hz to 20MHz, 1μH source impedance; VIN
=0 to 14V, IO= IOmax ; See Test
Configurations
Input Ripple Rejection (120Hz)
-
-60
-
dB
Input Current (no load)
2
2
Notes
VIN=3V to 14.4V, IO= IOmax
VIN = 12Vdc, IO = 0,
module enabled
Note: Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and
temperature conditions.
Output Specifications
Parameter
Min
Typ
Max
Unit
Output Voltage Set Point
-1.0
-
+1.0
%Vo,set
Output Voltage
-3.0
-
+3.0
%Vo,set
Adjustment Range
0.6
-
5.5
V
-
-
0.5
V
Remote Sense Range
Notes
with 0.1% tolerance for external resistor used to
set output voltage
Over all operating input voltage, resistive load,
and temperature conditions until end of life
1.selected by an external resistor
2.Some output voltages may not be possible
depending on the input voltage – see Feature
Descriptions Section
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
2
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Output Specifications (continued)
Parameter
Min
Typ
Max
Unit
Notes
VO ≥ 2.5V
VO < 2.5V
-
-
10
10
mV
mV
VO ≥ 2.5V
VO < 2.5V
-
-
0.4
5
%Vo,set
mV
VIN=VIN, min to VIN, max
Temperature Regulation
-
-
0.4
%Vo,set
Tref=TA, min to TA, max
Ripple and Noise (pk-pk)
-
50
100
mV
Ripple and Noise (rms)
-
20
38
mV
Output Short-Circuit Current
-
1.5
-
A
Vo≤250mV, Hiccup Mode
Output Capacitance
ESR≥ 1 mΩ
ESR≥0.15 mΩ
ESR≥ 10 mΩ
22
22
22
-
47
1000
5000
μF
μF
μF
Without the Tunable Loop
TM
With the Tunable Loop
TM
With the Tunable Loop
Output Current
0
-
12
A
In either sink or source mode
Output Current Limit
Inception
-
200
-
% Io,max
1. Hiccup Mode
2.Current limit does not operate in sink mode
Output voltage overshoot
-
-
3.0
%Vo, set.
Vin = Vin,min to Vin, max,IO = IO, min to IO, max,
TA=25°C
Output voltage Rise time
-
2.7
-
msec
Load Regulation
IO=IO, min to IO, max
Line Regulation
5Hz to 20MHz BW, VIN=VIN, nom and IO=IO, min to
IO, max Co = 0.1μF // 22 μF ceramic capacitors)
1
Notes:
1
TM
Time for Vo to rise from
10% of Vo, set to 90% of Vo, set.
TM
External capacitors may require using the new Tunable Loop feature to ensure that the module is stable as well
TM
as getting the best transient response. See the Tunable Loop section for details.
General Specifications
Parameter
Min
Typ
Max
Unit
-
77.5
85.9
89.6
92.4
93.4
95.0
-
%
%
%
%
%
%
-
600
-
kHz
2.6
-
0.3
2.9
-
V
V
V
-
120/130
-
C
-
VSEQ –Vo
VSEQ –Vo
100
100
mV
mV
Notes
Efficiency
Vo=0.6V
Vo=1.2V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Vo=5.0V
Switching Frequency
Vin= 12Vdc, TA=25°C
Io=Io, max , Vo= Vo,set
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Hysteresis
Over Temperature Protection
Tracking Accuracy
Power-Up: 2V/ms
Power-Down: 2V/ms
See Thermal Considerations
section
VIN, min to VIN, max; IO, min to IO, max
VSEQ < Vo
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
3
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
General Specifications(continued)
Parameter
PGOOD (Power Good)
Overvoltage threshold for PGOOD
Undervoltage threshold for PGOOD
Pulldown resistance of PGOOD pin
Weight
Min
-
MTBF
Typ
Max
Unit
112.5
87.5
30
-
%VO, set
%VO, set

2.33
-
g
16,817,995
hours
0.48 x 0.48 x 0.335
12.19 x 12.19 x 8.5
-
Notes
Signal Interface Open
Vsupply  5Vdc
Drain,
Calculated MTBF (IO=0.8IO, max,
TA=40°C) Telecordia Issue 2
Method 1 Case 3
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Note: Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and
temperature conditions.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
4
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
90
95
85
90
80
85
EFFICIENCY,  (%)
EFFICIENCY,  (%)
Efficiency Data
Vin=3.3V
75
70
65
Vin=14.4
V
Vin=12V
60
55
50
Vin=3.3V
80
Vin=12V
75
65
60
55
50
0
2
4
6
8
10
12
0
2
OUTPUT CURRENT, IO (A)
4
100
95
95
EFFICIENCY,  (%)
EFFICIENCY,  (%))
10
12
90
Vin=3.3V
85
80
Vin=14.4
V
Vin=12V
75
8
Vo=1.2V
100
90
6
OUTPUT CURRENT, IO (A)
Vo=0.6V
70
65
85
80
Vin=14.4V
Vin=12V
Vin=4.5V
75
70
65
60
60
0
2
4
6
8
10
0
12
2
OUTPUT CURRENT, IO (A)
4
6
8
10
12
OUTPUT CURRENT, IO (A)
Vo=1.8V
Vo=2.5V
100
100
95
95
90
EFFICIENCY,  (%)
EFFICIENCY,  (%))
Vin=14.4
V
70
Vin=5V
Vin=14.4
V
85
Vin=12V
80
75
70
90
Vin=7V
Vin=14.4V
85
Vin=12V
80
75
70
0
2
4
6
8
OUTPUT CURRENT, IO (A)
Vo=3.3V
10
12
0
2
4
6
8
10
12
OUTPUT CURRENT, IO (A)
Vo=5.0V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
5
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Thermal Derating Curves
12
10
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
12
NC
8
0.5m/s
(100LFM)
Standard Part
(85°
C)
6
1.5m/s
(300LFM)
Ruggedized (D) Part
(105°
C)
4
2
2m/s
(400LFM)
1m/s
(200LFM)
0
55
65
75
85
95
105
10
NC
0.5m/s
(100LFM)
8
6
Standard
Part (85 C)
4
2m/s
(400LFM)
2
Ruggedized (D) Part
(105°
C)
0
55
AMBIENT TEMPERATURE, TA OC
65
85
95
105
Vo=1.2V
12
12
10
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
75
AMBIENT TEMPERATURE, TA OC
Vo=0.6V
NC
0.5m/s
(100LFM)
8
6
Standard Part
(85°C)
4
2
1.5m/s
(300LFM)
1m/s
(200LFM)
2m/s
(400LFM)
Ruggedized (D) Part
(105°
C)
0
55
65
75
85
95
10
NC
0.5m/s
(100LFM)
8
6
1m/s
(200LFM)
Standard Part
(85°
C)
4
2
1.5m/s
(300LFM)
2m/s
(400LFM)
Ruggedized (D)
Part (105°
C)
0
105
55
O
65
75
85
95
105
O
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
Vo=1.8V
Vo=2.5V
12
12
10
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
1.5m/s
(300LFM)
1m/s
(200LFM)
NC
8
0.5m/s
(100LFM)
6
1m/s
(200LFM)
Standard Part
(85°
C)
4
1.5m/s
(300LFM)
2
Ruggedized (D) Part
(105°
C)
2m/s
(400LFM)
0
55
65
75
85
95
O
AMBIENT TEMPERATURE, TA C
Vo=3.3V
105
10
NC
0.5m/s
(100LFM)
8
6
Standard Part
(85°
C)
1m/s
(200LFM)
4
1.5m/s
(300LFM)
2
2m/s
(400LFM)
Ruggedized (D) Part
(105°
C)
0
55
65
75
85
95
105
O
AMBIENT TEMPERATURE, TA C
Vo=5.0V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
6
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Feb. 16, 2012
Bel Power Inc., a subsidiary of Bel Fuse Inc.
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
Output ripple and Noise Waveforms
TIME, t (1s/div)
TIME, t (1s/div)
Vo=1.2V, Io = Io,max, Vin=12V
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
Vo=0.6V, Io = Io,max, Vin=8V
TIME, t (1s/div)
TIME, t (1s/div)
Vo=2.5V, Io = Io,max, Vin=12V
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
Vo=1.8V, Io = Io,max, Vin=12V
TIME, t (1s/div)
Vo=3.3V, Io = Io,max, Vin=12V
TIME, t (1s/div)
Vo=5.0V, Io = Io,max, Vin=12V
Note: CO=22μF ceramic
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
7
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Feb. 16, 2012
TIME, t (20s /div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout-1x47uF+3x330uF, CTune10nF & RTune-220ohms. Vo=1.2V
TIME, t (20s /div)
TIME, t (20s /div)
OUTPUT VOLTAGE
VO (V) (50mV/div)
Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout-1x47uF+1x330uF,CTune3300pF & RTune-270ohms. Vo=2.5V
TIME, t (20s /div)
Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout-1x47uF+1x330uF,CTune2700pF & RTune-330ohms. Vo=3.3V
OUTPUT CURRENT,
IO (A) (10Adiv)
OUTPUT VOLTAGE
VO (V) (50mV/div)
Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout-1x47uF+2x330uF,CTune5600pF & RTune-270ohms. Vo=1.8V
OUTPUT CURRENT,
IO (A) (10Adiv)
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT,
IO (A) (10Adiv)
OUTPUT CURRENT,
IO (A) (10Adiv)
OUTPUT VOLTAGE
VO (V) 5 mV/div)
OUTPUT CURRENT,
IO (A) (10Adiv)
TIME, t (20s /div)
Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout-3x47uF+6x330uF, CTune47nF, RTune-180ohms. Vo=0.6V
OUTPUT CURRENT,
IO (A) (10Adiv)
Bel Power Inc., a subsidiary of Bel Fuse Inc.
OUTPUT VOLTAGE
VO (V) (10 mV/div)
Transient Response Waveforms
TIME, t (20s /div)
Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout-5x47uF, CTune-1500pF &
RTune-330ohms Vo=5.0V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
8
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
TIME, t (2 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.2V
OUTPUT VOLTAGE
VO (V) (1V/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
TIME, t (2 ms/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=0.6V
OUTPUT VOLTAGE
VO (V) (500mV/div)
ON/OFF VOLTAGE
VON/OFF (V)(5V/div)
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (200mV/div)
VON/OFF (V) (5V/div)
Startup Time
TIME, t (2 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=2.5V
OUTPUT VOLTAGE
VO (V) (2V/div)
OUTPUT VOLTAGE ON/OFF VOLTAGE
VO (V) (1V/div)
VON/OFF (V) (5V/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.8V
TIME, t (2 ms/div)
TIME, t (2 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=3.3V
TIME, t (2 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=5.0V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
9
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=2.5V
INPUT VOLTAGE
VIN (V) (5V/div)
INPUT VOLTAGE
VIN (V) (5V/div)
OUTPUT VOLTAGE
VO (V) (1V/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
INPUT VOLTAGE
VIN (V) (5V/div)
INPUT VOLTAGE
VIN (V) (5V/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=1.8V
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=1.2V
OUTPUT VOLTAGE
INPUT VOLTAGE
VO (V) (1V/div)
VIN (V) (5V/div)
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=0.6V
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=3.3V
OUTPUT VOLTAGE
VO (V) (2V/div)
OUTPUT VOLTAGE
VO (V) (200mV/div)
INPUT VOLTAGE
VIN (V) (5V/div)
Startup Time (continued)
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=5.0V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
10
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Design Considerations
Input Filtering
The SLAN-12D2Ax module should be connected to a low ac-impedance source. A highly inductive source can
affect the stability of the module. An input capacitance must be placed directly adjacent to the input pin of the
module, to minimize input ripple voltage and ensure module stability.
Input Ripple Voltage (mVp -p)
To minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. Figure 37
shows the input ripple voltage for various output voltages at 12A of load current with 2x22 µF or 3x22 µF ceramic
capacitors and an input of 12V.
Figure 37
Output Voltage (Vdc)
Note: Input ripple voltage for various output voltages with 2x22 µF or 3x22 µF ceramic capacitors at the input
(12A load). Input voltage is 12V.
Output Filtering
The SLAN-12D2Ax modules are designed for low output ripple voltage and will meet the maximum output ripple
specification with 0.1 µF ceramic and 22 µF ceramic capacitors at the output of the module. However, additional
output filtering may be required by the system designer for a number of reasons. First, there may be a need to
further reduce the output ripple and noise of the module. Second, the dynamic response characteristics may
need to be customized to a particular load step change.
To reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at
the output can be used. Low ESR polymer and ceramic capacitors are recommended to improve the dynamic
response of the module. Figure 38 provides output ripple information for different external capacitance values at
various Vo and a full load current of 12A. For stable operation of the module, limit the capacitance to less than
the maximum output capacitance as specified in the electrical specification table. Optimal performance of the
TM
module can be achieved by using the Tunable Loop feature described later in this data sheet.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
11
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Output Filtering (continued)
Figure 38
60
1x22uF Ext Cap
1x47uF Ext Cap
2x47uF Ext Cap
4x47uF Ext Cap
Ripple (mVp-p)
50
40
30
20
10
0
0.5
1.5
2.5
3.5
Output Voltage(Volts)
4.5
Note: Output ripple voltage for various output voltages with external 1x22 µF, 1x47 µF, 2x47 µF or 4x47 µF
ceramic capacitors at the output (12A load). Input voltage is 12V.
Safety Considerations
For safety agency approval the power module must be installed in compliance with the spacing and separation
requirements of the end-use safety agency standards, i.e., UL 60950-1 2nd, CSA C22.2 No. 60950-1-07, DIN EN
60950-1:2006 + A11 (VDE0805 Teil 1 + A11):2009-11; EN 60950-1:2006 + A11:2009-03.
For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input
must meet SELV requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV.
The input to these units is to be provided with a time delay fuse with a maximum rating of 15 A in the positive
input lead.
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12
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Feature Descriptions
Remote On/Off
Parameter
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Active Low
Active High
Min
-
Typ
-
Max
10
Unit
μA
-0.2
-
0.4
V
-
-
1
mA
3.0
-
Vin,max
V
Notes
The remote on/off pin open, Unit on.
The remote on/off pin open, Unit on.
The SLAN-12D2Ax modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options are
available. In the Positive Logic On/Off option, (device code suffix “0” – see Ordering Information), the module
turns ON during a logic High on the On/Off pin and turns OFF during a logic Low. With the Negative Logic
On/Off option, (device code suffix “L” – see Ordering Information), the module turns OFF during logic High and
ON during logic Low. The On/Off signal should be always referenced to ground. For either On/Off logic option,
leaving the On/Off pin disconnected will turn the module ON when input voltage is present.
For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 39. When the
external transistor Q1 is in the OFF state, the internal PWM Enable signal is pulled high through an internal
resistor and the external pullup resistor and the module is ON. When transistor Q1 is turned ON, the On/Off pin is
pulled low and the module is OFF. A suggested value for Rpullup is TBD.
Figure 39
TBD
Circuit configuration for using positive On/Off logic.
For negative logic On/Off modules, the circuit configuration is shown in Fig. 40. The On/Off pin should be pulled
high with an external pull-up resistor (suggested value for the 3V to 14.4V input range is 20Kohms). When
transistor Q1 is in the OFF state, the On/Off pin is pulled high, internal transistor Q4 is turned ON and the module
is OFF. To turn the module ON, Q1 is turned ON pulling the On/Off pin low, turning transistor Q4 OFF resulting in
the PWM Enable pin going high and the module turning ON.
Figure 40
VIN +
MOD U LE
R pullup
PWM Enable
I
ON/OFF
ON / OF F
+
VON/OFF
Q1
GN D
Q4
22K
2 2K
C SS
_
PVX012 NEGATIVE LOGIC FIGUR E
Circuit configuration for using negative On/Off logic.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
13
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Monotonic Start-up and Shutdown
The module has monotonic start-up and shutdown behavior for any combination of rated input voltage, output
current and operating temperature range.
Startup into Pre-biased Output
The modules can start into a prebiased output as long as the prebias voltage is 0.5V less than the set output
voltage.
Output Voltage Programming
The output voltage of the module is programmable to any voltage from 0.6dc to 5.5Vdc by connecting a resistor
between the Trim and GND pins of the module. Certain restrictions apply on the output voltage set point
depending on the input voltage. These are shown in the Output Voltage vs. Input Voltage Set Point Area plot in
Fig. 41. The Upper Limit curve shows that for output voltages lower than 1V, the input voltage must be lower
than the maximum of 14.4V. The Lower Limit curve shows that for output voltages higher than 0.6V, the input
voltage needs to be larger than the minimum of 3V.
Figure 41
16
Input Voltage (v)
14
12
Upper
10
8
6
4
Lower
2
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Output Voltage (V)
Note: Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for
different input voltages.
Figure 42
VIN(+)
VO(+)
VS+
ON/OFF
LOAD
TRIM
Rtrim
GND
Circuit configuration for programming output voltage using an external resistor.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
14
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Output Voltage Programming(continued)
Without an external resistor between Trim and GND pins, the output of the module will be 0.6Vdc. To calculate
the value of the trim resistor, Rtrim for a desired output voltage, should be as per the following equation:
 12

Rtrim  
 k
Vo  0.6 
Rtrim is the external resistor in kΩ
Vo is the desired output voltage. Table 1 provides Rtrim values required for some common output voltages.
Table1
VO, set (V)
0.6
0.9
1.0
1.2
1.5
1.8
2.5
3.3
5.0
Rtrim (KΩ)
Open
40
30
20
13.33
10
6.316
4.444
2.727
Remote Sense
The power module has a Remote Sense feature to minimize the effects of distribution losses by regulating the
voltage at the SENSE pin. The voltage between the SENSE pin and VOUT pin should not exceed 0.5V.
Voltage Margining
Output voltage margining can be implemented in the module by connecting a resistor, Rmargin-up, from the Trim pin
to the ground pin for margining-up the output voltage and by connecting a resistor, Rmargin-down, from the Trim pin
to output pin for margining-down. Figure 43 shows the circuit configuration for output voltage margining. The
POL Programming Tool, available at www.lineagepower.com under the Downloads section, also calculates the
values of Rmargin-up and Rmargin-down for a specific output voltage and % margin. Please consult your local Bel
Power technical representative for additional details.
Figure 43
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rtrim
Q1
GND
Circuit Configuration for margining Output voltage.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
15
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Overcurrent Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting
circuitry and can endure current limiting continuously. At the point of current-limit inception, the unit enters hiccup
mode. The unit operates normally once the output current is brought back into its specified range.
Overtemperature Protection
To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will
o
shutdown if the overtemperature threshold of 120(Q1) / 130(L1) C(typ) is exceeded at the thermal reference
point Tref . Once the unit goes into thermal shutdown it will then wait to cool before attempting to restart.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will
begin to operate at an input voltage above the undervoltage lockout turn-on threshold.
Power Good
The module provides a Power Good (PGOOD) signal that is implemented with an open-drain output to indicate
that the output voltage is within the regulation limits of the power module. The PGOOD signal will be de-asserted
to a low state if any condition such as overtemperature, overcurrent or loss of regulation occurs that would result
in the output voltage going ±10% outside the setpoint value. The PGOOD terminal can be connected through a
pullup resistor (suggested value 100K) to a source of 5VDC or lower.
Dual Layout
Identical dimensions and pin layout of Analog and Digital modules permit migration from one to the other without
needing to change the layout. To support this, 2 separate Trim Resistor locations have to be provided in the
layout. For the digital modules, the resistor is connected between the TRIM pad and SGND and in the case of the
analog module it is connected between TRIM and GND.
Figure 44
MODULE
TRIM
(PVX012 / PDT012)
Rtrim1
for
Digital
Rtrim2
for
Analog
SIG_GND
GND (PIN 7)
Caution – Do not connect SIG_GND to GND elsewhere in the layout
Layout to support either Analog or Digital on the same pad.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
16
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Tunable LoopTM
The SLAN-12D2Ax modules have a feature that optimizes transient response of the module called Tunable
TM
Loop .
External capacitors are usually added to the output of the module for two reasons: to reduce output ripple and
noise (see Figure 38) and to reduce output voltage deviations from the steady-state value in the presence of
dynamic load current changes. Adding external capacitance however affects the voltage control loop of the
module, typically causing the loop to slow down with sluggish response. Larger values of external capacitance
could also cause the module to become unstable.
TM
The Tunable Loop allows the user to externally adjust the voltage control loop to match the filter network
TM
connected to the output of the module. The Tunable Loop is implemented by connecting a series R-C between
the SENSE and TRIM pins of the module, as shown in Fig. 45. This R-C allows the user to externally adjust the
voltage loop feedback compensation of the module.
Figure 45
VOUT
SENSE
RTUNE
CO
MODULE
CTUNE
TRIM
GND
RTrim
Circuit diagram showing connection of RTUME and CTUNE to tune the control loop of the module.
Recommended values of RTUNE and CTUNE for different output capacitor combinations are given in Tables 2 and 3.
Table 2 shows the recommended values of RTUNE and CTUNE for different values of ceramic output capacitors up
to 1000uF that might be needed for an application to meet output ripple and noise requirements. Selecting RTUNE
and CTUNE according to Table 2 will ensure stable operation of the module.
In applications with tight output voltage limits in the presence of dynamic current loading, additional output
capacitance will be required. Table 3 lists recommended values of RTUNE and CTUNE in order to meet 2% output
voltage deviation limits for some common output voltages in the presence of a 6A to 12A step change (50% of
full load), with an input voltage of 12V.
Please contact your Bel Power technical representative to obtain more details of this feature as well as for
guidelines on how to select the right value of external R-C to tune the module for best transient performance and
stable operation for other output capacitance values or input voltages other than 12V.
Table 2
Co
1x47F 2x47F 4x47F 6x47F 10x47F
RTUNE
330
330
CTUNE
100pF
560pF
330
330
1500pF 2200pF
20x47F
270
180
3900pF
6800pF
General recommended values of of RTUNE and CTUNE for Vin=12V and various external ceramic capacitor
combinations.
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NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Tunable LoopTM(continued)
Table 3
Vo
5V
3.3V
2.5V
1.8V
1.2V
0.6V
RTUNE
1x47F + 3x47F + 1x47F + 1x47F + 3x47F +
5x47F 330F
330F 2x330F 3x330F 6x330F
Polymer Polymer Polymer Polymer Polymer
330
330
270
270
220
180
CTUNE
1500pF
2700pF
3300pF
5600pF
10nF
47nF
V
99mV
58mV
47mV
34mV
24mV
12mV
Co
Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 6A step load with
Vin=12V.
Thermal Consideration
Power modules operate in a variety of thermal environments; however, sufficient cooling should always be
provided to help ensure reliable operation.
Considerations include ambient temperature, airflow, module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The
thermal data presented here is based on physical measurements taken in a wind tunnel. The test set-up is
shown in Figure 46. The preferred airflow direction for the module is in Figure 47.
Figure 46
25.4_
(1.0)
Wind Tunnel
PWBs
Power Module
76.2_
(3.0)
x
12.7_
(0.50)
Probe Location
for measuring
airflow and
ambient
temperature
Air
flow
The thermal reference points, Tref used in the specifications are also shown in Figure 47. For reliable operation
o
o
the temperature at Q1 should not exceed 120 C and the temperature at L1 should not exceed 130 C. The output
power of the module should not exceed the rated power of the module (Vo,set x Io,max).
Please refer to the Application Note “Thermal Characterization Process For Open-Frame Board-Mounted Power
Modules” for a detailed discussion of thermal aspects including maximum device temperatures.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
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NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Thermal Consideration(continued)
Figure 47
Preferred airflow direction and location of hot-spot of the module (Tref).
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
19
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Example Application Circuit
Requirements:
Vin:
12V
Vout:
1.8V
Iout:
9A max., worst case load transient is from 6A to 9A
Vout:
1.5% of Vout (27mV) for worst case load transient
Vin, ripple
1.5% of Vin (180mV, p-p)
Vout+
Vin+
VIN
VOUT
SENSE
PGOOD
+
CI3
CI2
RTUNE
+
MODULE
CI1
CTUNE
ON/OFF
CO1
CO2
TRIM
GND
RTrim
CI1
Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01)
CI2
2x22F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)
CI3
47F/16V bulk electrolytic
CO1
Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01)
CO2
2 x 47F/6.3V ceramic capacitor (e.g. Murata GRM31CR60J476ME19)
CO3
1 x 330F/6.3V Polymer (e.g. Sanyo Poscap)
CTune
3300pF ceramic capacitor (can be 1206, 0805 or 0603 size)
RTun
270 ohms SMT resistor (can be 1206, 0805 or 0603 size)
RTrim
10k SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
20
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Feb. 16, 2012
Mechanical Outline
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Dimensions are in millimeters and (inches).
Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated]
x.xx mm  0.25 mm (x.xxx in  0.010 in.)
17
16
13
14
12
15
PIN
1
2
3
4
5
6
7
8
9
FUNCTION
ON/OFF
VIN
GND
VOUT
VS+ (SENSE)
TRIM
GND
NC
NC
11
7
8
PIN
10
11
12
13
14
15
16
17
9
FUNCTION
PGOOD
NC
NC
NC
NC
NC
NC
NC
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
21
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Recommended Pad Layout
Dimensions are in millimeters and (inches).
Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated]
x.xx mm  0.25 mm (x.xxx in  0.010 in.)
16
17
13
12
11
9
8
7
14
15
PIN FUNCTION PIN FUNCTION
1
ON/OFF
10
PGOOD
2
VIN
11
NC
3
GND
12
NC
4
VOUT
13
NC
5 VS+ (SENSE) 14
NC
6
TRIM
15
NC
7
GND
16
NC
8
NC
17
NC
9
NC
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
22
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Packaging Details
The SLAN-12D2Ax modules are supplied in tape & reel as standard. Modules are shipped in quantities of 200
modules per reel.
All Dimensions are in millimeters and (in inches)
Reel Dimensions:
Outside Dimensions:
330.2 mm (13.00)
Inside Dimensions:
177.8 mm (7.00”)
Tape Width:
24.00 mm (0.945”)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
23
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Feb. 16, 2012
Surface Mount Information
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Pick and Place
The SLAN-12D2Ax modules use an open frame construction and are designed for a fully automated assembly
process. The modules are fitted with a label designed to provide a large surface area for pick and place
operations. The label meets all the requirements for surface mount processing, as well as safety standards, and
o
is able to withstand reflow temperatures of up to 300 C. The label also carries product information such as
product code, serial number and the location of manufacture.
Nozzle Recommendations
The module weight has been kept to a minimum by using open frame construction. Variables such as nozzle size,
tip style, vacuum pressure and placement speed should be considered to optimize this process. The minimum
recommended inside nozzle diameter for reliable operation is 3mm. The maximum nozzle outer diameter, which
will safely fit within the allowable component spacing, is 7 mm.
Bottom Side / First Side Assembly
This module is not recommended for assembly on the bottom side of a customer board. If such an assembly is
attempted, components may fall off the module during the second reflow process.
Lead Free Soldering
The SLAN-12D2Ax modules are lead-free (Pb-free) and RoHS compliant and fully compatible in a Pb-free
soldering process. Failure to observe the instructions below may result in the failure of or cause damage to the
modules and can adversely affect long-term reliability.
.
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic
Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures. This
standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the
package (table 4-2). The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). For questions regarding LGA,
solder volume; please contact Lineage Power for special manufacturing process instructions.
The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Fig. 48. Soldering outside of the
recommended profile requires testing to verify results and performance.
MSL Rating
The SLAN-12D2Ax modules have a MSL rating of 1.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
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NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Storage and Handling
The recommended storage environment and handling procedures for moisture-sensitive surface mount packages
is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface
Mount Devices). Moisture barrier bags (MBB) with desiccant are required for MSL ratings of 2 or greater. These
sealed packages should not be broken until time of use. Once the original package is broken, the floor life of the
product at conditions of  30°C and 60% relative humidity varies according to the MSL rating (see J-STD-033A).
The shelf life for dry packed SMT packages will be a minimum of 12 months from the bag seal date, when stored
at the following conditions: < 40° C, < 90% relative humidity.
Figure48
300
Pe r J-STD-020 Re v. C
Peak Temp260癈
Reflow Temp (癈)
250
200
* Min. Time Above 235癈
15 Seconds
150
Heating Zone
1癈/Se cond
Cooling
Zone
*Time Above 217癈
60 Sec onds
100
50
0
Reflo w Time (Seco nds)
Recommended linear reflow profile using Sn/Ag/Cu solder.
Post Solder Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result
of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to
Board Mounted Power Modules: Soldering and Cleaning Application Note (AN04-001).
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25
NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6Vdc - 5.5 Vdc /12 A Outputs
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Feb. 16, 2012
Revision History
Date
Revision
2012-02-16
A
Changes Detail
Approval
First release
HL LU
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
2012 Bel Fuse Inc. Specifications subject to change without notice. 021612
26
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com