BEL SLIN

NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
SLIN-20F1Ax
RoHS Compliant
Rev.B
Features
•
Wide Input Voltage Range
•
Flexible Output Voltage Sequencing
•
Output Voltage Programmable
•
Over Temperature Protection
•
Fixed Switching Frequency
•
Output Over Current Protection
•
Remote On/Off
•
Ability to Sink and Source Current
•
Remote Sense
•
Cost Efficient Open Frame Design
TM
•
Tunable Loop (a registered trademark of Lineage Power Systems) to Optimize Dynamic
output voltage response
•
Class 1, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592)
•
Compliant to RoHS EU Directive 2002/95/EC
•
UL* 60950-1 Recognized, CSA† C22.2 No. 60950-1-03 Certified
•
VDE‡ 0805:2004-09 (EN60950-1) Licensed
Applications
•
•
•
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
•
•
•
Servers and storage applications
Networking equipment
Industrial equipment
Description
The SLIN-20F1Ax series of power modules are non-isolated dc/dc converters that can deliver up to 20A of output
current. These modules operate over a wide range of input voltage (VIN = 2.4Vdc-5.5Vdc) and provide a
precisely regulated output voltage from 0.6Vdc to 3.63Vdc, programmable via an external resistor. Features
include remote On/Off, adjustable output voltage, over current and over temperature protection, and output
voltage sequencing. A new feature, the Tunable LoopTM, 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 Vdc - 3.63 Vdc
2.4 Vdc - 5.5 Vdc
Max. Output
Current
20 A
Typical
Efficiency
90.8%
Model Number
Active High
SLIN-20F1A0
Model Number
Active Low
SLIN-20F1AL
Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
S LIN – 20 F 1A 0
1
2
3 4
5
6
1---Surface mount
2---Series code
3---Output current (20A)
4--- Wide input voltage range (2.4-5.5V)
5--- Wide output voltage range (0.6-3.63V)
6--- Enable, active high, change “0” to “L” means active low
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Absolute Maximum Ratings
Min
Typ
Max
Unit
Continuous Input Voltage
-0.3
-
6
V
Sequencing Voltage
-0.3
-
Vin,max
V
Operating Ambient Temperature
-40
-
85
°C
Storage Temperature
-55
-
125
°C
Parameter
Notes
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.
Input Specifications
Parameter
Operating Input Voltage
Min
2.4
Typ
-
Max
5.5
Unit
V
Input Current (full load)
-
-
19.5
A
-
47
-
mA
VIN=5.0V, Vo=0.6V, IO=0, module enabled
-
52
-
mA
VIN=5.0V, Vo=3.3V, IO=0, module enabled
-
5
-
mA
VIN = 5V, module disabled
5Hz to 20MHz, 1μH source impedance; VIN
=0 to 5.5V, IO= IOmax
Input Current (no load)
Input Stand-by Current
Input Reflected Ripple Current
(pk-pk)
-
12
-
mA
I2t Inrush Current Transient
-
-
1
A2s
Input Ripple Rejection (120Hz)
-
43
-
dB
Turn-on Threshold
-
2.2
-
V
Turn-off Threshold
-
2.0
-
V
0.08
-
0.2
V
Hysteresis
Notes
VIN=2.4V to 5.5V, IO=IO, max
CAUTION: This converter is not internally fused. An input line fuse must be used in application.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to
an integrated part of sophisticated power architecture. To preserve maximum flexibility, internal fusing is not
included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety
agencies require a fast-acting fuse with a maximum rating of 20A. 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 sheet for further information.
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
2
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Output Specifications
Parameter
Min
Typ
Max
Unit
Output Voltage Set Point
-1.5
-
+1.5
%Vo,set
Output Voltage
-3.0
-
+3.0
%Vo,set
Adjustment Range
0.6
-
3.63
V
Remote Sense Range
-
-
0.5
V
Output Regulation
(for VO ≥ 2.5Vdc)
-
-
0.4
%Vo,set
Line Regulation, VIN=VIN, min to VIN, max
-
-
0.4
%Vo,set
Load Regulation, IO=IO, min to IO, max
-
-
10
mV
Line Regulation, VIN=VIN, min to VIN, max
-
-
10
mV
Load Regulation, IO=IO, min to IO, max
-
-
0.4
%Vo,set
Ripple and Noise (pk-pk)
-
20
35
mV
Ripple and Noise (rms)
-
10
15
mV
Output Current Range
0
-
20
A
Output DC Current Limit
-
200
-
%Io,max
Hiccup Mode
Output Short-Circuit Current
-
30
-
%Io,max
Vo≤250mV, Hiccup Mode
Output Capacitance
ESR≥ 1 mΩ
ESR≥0.15 mΩ
ESR≥ 10 mΩ
0
0
0
-
200
1000
10000
uF
uF
uF
Without the Tunable LoopTM
With the Tunable LoopTM
With the Tunable LoopTM
-
2
-
mS
Case 1: On/Off input is enabled and then input
power is applied (delay from instant at which
VIN = VIN, min until Vo =10% of Vo, set)
Output Regulation
(for VO < 2.5Vdc)
Turn-On Delay Time
Notes
with 0.5% tolerance for external resistor used to
set output voltage
Over all operating input voltage, resistive load,
and temperature conditions until end of life
selected by an external resistor
Temperature Regulation, Tref=TA, min to TA, max
5Hz to 20MHz BW, VIN=VIN, nom and IO=IO, min to
IO, max, Co = 0.1μF // 10 μF ceramic capacitors
-
2
-
mS
Case 2: Input power is applied for at least one
second and then the On/Off input is enabled
(delay from instant at which Von/Off is enabled
until Vo =10% of Vo, set)
Output voltage Rise time
-
5
-
mS
time for Vo to rise from 10% of Vo, set to 90%
of Vo, set
Output voltage overshoot
-
-
3
%Vo
Vin=Vin, min to Vin, max, Io=Io, max, With or without
maximum external capacitance
Dynamic Load Response
△V0%~50% of
Max Load
△V50%~0% of
Max Load
Peak Deviation
-
330
-
mV
Settling Time
-
30
-
uS
Peak Deviation
-
420
-
mV
Settling Time
-
30
-
uS
di/dt=10A/us, Vin=3.3V, Vo=1.5V,
Ta=25°C, Co=0
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
3
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
General Specifications
Parameter
Min
Typ
Max
Unit
-
70.0
81.9
87.3
90.8
92.9
-
%
%
%
%
%
Switching Frequency
-
600
-
kHz
Over Temperature Protection
-
144
-
°C
10
-
-
mS
Tracking Accuracy
Power-Up: 2V/ms
Power-Down: 2V/ms
-
-
100
100
mV
mV
Weight
-
6.03
-
g
Notes
Efficiency
Vo=0.6V
Vo=1.2V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Sequencing Delay time
MTBF
7,868,128
hours
1.30 x 0.53 x 0.334
33.02 x 13.46 x 8.50
-
Vin= 3.3Vdc, Ta=25°C
Io=Io, max , Vo= Vo,set
Vin=5.0V, when Vo=3.3V
Delay from VIN, min to application of
voltage on SEQ pin
VIN, min to VIN, max; IO, min - IO, max
VSEQ < Vo
Calculated MTBF (Vin=5V,
Io=80% full load, Ta=40°C)
Telcordia Issue 2, Method I 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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Efficiency Data
85
90
85
EFFICIENCY, η (%)
EFFICIENCY, η (%)
80
Vin=5.5V
75
70
Vin=3.3V
65
Vin=2.4V
Vin=5.5V
80
Vin=3.3V
Vin=2.4V
75
70
60
0
5
10
15
0
20
OUTPUT CURRENT, IO (A)
5
2
15
2
Vo=1.2V
95
95
90
90
EFFICIENCY, η (%)
EFFICIENCY, η (%))
15
OUTPUT CURRENT, IO (A)
Vo=0.6V
Vin=5.5V
85
10
Vin=3.3V
Vin=2.4V
80
Vin=3.3V
Vin=5.5V
85
Vin=5V
80
75
75
0
5
10
15
20
OUTPUT CURRENT, IO (A)
0
5
10
OUTPUT CURRENT, IO (A)
Vo=1.8V
Vo=2.5V
EFFICIENCY, η (%))
100
95
Vin=4.5V
Vin=5.5V
90
Vin=5V
85
0
5
10
15
20
OUTPUT CURRENT, IO (A)
Vo=3.3V
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
22
22
20
20
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
Thermal Derating Curves
18
16
1m/s
(200LFM) 1.5m/s
(300LFM)
2m/s
(400LFM)
14
12
NC
0.5m/s
(100LFM)
10
8
6
18
16
2m/s
(400LFM)
14
1.5m/s
(300LFM)
12
NC
0.5m/s
(100LFM)
10
8
6
25
35
45
55
65
75
85
25
AMBIENT TEMPERATURE, TA OC
35
20
20
OUTPUT CURRENT, Io (A)
22
18
2m/s
(400LFM)
14
1.5m/s
(300LFM)
12
10
1m/s
(200LFM)
NC
0.5m/s
(100LFM)
8
55
65
75
85
Vo=1.2V
22
16
45
AMBIENT TEMPERATURE, TA OC
Vo=0.6V
OUTPUT CURRENT, Io (A)
1m/s
(200LFM)
18
16
2m/s
(400LFM)
14
12
1.5m/s
(300LFM)
10
1m/s
(200LFM)
NC
0.5m/s
(100LFM)
8
6
6
25
35
45
55
65
75
85
AMBIENT TEMPERATURE, TA OC
25
35
45
55
65
75
85
AMBIENT TEMPERATURE, TA OC
Vo=1.8V
Vo=2.5V
22
OUTPUT CURRENT, Io (A)
20
18
16
2m/s
(400LFM)
14
1m/s
(200LFM)
1.5m/s
(300LFM)
12
10
NC
0.5m/s
(100LFM)
8
6
25
35
45
55
65
75
85
AMBIENT TEMPERATURE, TA OC
Vo=3.3V
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT VOLTAGE
VO (V) (10mV/div)
Ripple and Noise Waveforms
TIME, t (1μs/div)
TIME, t (1μs/div)
Vin=3.3V, Vo=1.2V, Io = Io,max
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT VOLTAGE
VO (V) (10mV/div)
Vin=3.3V, Vo=0.6V, Io = Io,max
TIME, t (1μs/div)
Vin=3.3V, Vo=2.5V, Io = Io,max
OUTPUT VOLTAGE
VO (V) (10mV/div)
Vin=3.3V, Vo=1.8V, Io = Io,max
TIME, t (1μs/div)
TIME, t (1μs/div)
Vin=5V, Vo=3.3V, Io = Io,max
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
OUTPUT VOLTAGE
VO (V) (500mV/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
OUTPUT CURRENT,
IO (A) (10A/div)
TIME, t (100μs /div)
Transient Response to Dynamic Load Change from
0% 50% to 0%. Vin=3.3V, Vo=1.2V
OUTPUT VOLTAGE
VO (V) (500mV/div)
Transient Response to Dynamic Load Change from
0% 50% to 0%. Vin=3.3V, Vo=0.6V
OUTPUT CURRENT,
IO (A) (10A/div)
TIME, t (100μs /div)
TIME, t (100μs /div)
TIME, t (100μs /div)
Transient Response to Dynamic Load Change from
0% 50% to 0%. Vin=5V, Vo=2.5V
OUTPUT CURRENT,
IO (A) (10A/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
Transient Response to Dynamic Load Change from
0% 50% to 0%. Vin=3.3V, Vo=1.8V
OUTPUT CURRENT,
IO (A) (10A/div)
OUTPUT CURRENT,
IO (A) (10A/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
Transient Response Waveforms
TIME, t (100μs /div)
Transient Response to Dynamic Load Change from
0% 50% to 0%. Vin=5V, Vo=3.3V
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
OUTPUT VOLTAGE
Vo (V) (200mV/div)
OUTPUT VOLTAGE
Vo (V) 500mV/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
Startup Time
TIME, t (2 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.2V
OUTPUT VOLTAGE
Vo (V) (1V/div)
OUTPUT VOLTAGE
Vo (V) (500mV/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=0.6V
TIME, t (2 ms/div)
TIME, t (2 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=2.5V
OUTPUT VOLTAGE
Vo (V) (1V/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
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
OUTPUT VOLTAGE
Vo(V) (500mV/div)
OUTPUT VOLTAGE
Vo(V) (200mV/div)
INPUT VOLTAGE
VIN (V) (2V/div)
INPUT VOLTAGE
VIN (V) (2V/div)
Startup Time (continued)
TIME, t (2 ms/div)
INPUT VOLTAGE
VIN (V) (2V/div)
Start-up Using Input Voltage (VIN = 3.3V, Io = Io,max ),
Vo=1.2V
OUTPUT VOLTAGE
Vo(V) (1V/div)
OUTPUT VOLTAGE
Vo(V) (500mV/div)
INPUT VOLTAGE
VIN (V) (2V/div)
Start-up Using Input Voltage (VIN = 3.3V, Io = Io,max ),
Vo=0.6V
TIME, t (2 ms/div)
TIME, t (2 ms/div)
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 5V, Io = Io,max ),
Vo=2.5V
OUTPUT VOLTAGE INPUT VOLTAGE
Vo(V) (1V/div)
VIN (V) (2V/div)
Start-up Using Input Voltage (VIN = 3.3V, Io = Io,max ),
Vo=1.8V
TIME, t (2 ms/div)
Start-up Using Input Voltage (VIN = 5V, Io = Io,max ),
Vo=3.3V
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Test Configurations
Input Reflected Ripple Current Test Setup.
CURRENT PROBE
TO OSCILLOSCOPE
LTEST
VIN(+)
BATTERY
1μH
CIN
CS 1000μF
Electrolytic
2x100μF
Tantalum
E.S.R.<0.1Ω
@ 20°C 100kHz
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
Output Ripple and Noise Test Setup.
COPPER STRIP
RESISTIVE
LOAD
Vo+
0.1uF
10uF
COM
SCOPE USING
BNC SOCKET
GROUND PLANE
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Output Voltage and Efficiency Test Setup.
Rdistribution
Rcontact
Rcontact
VIN(+)
RLOAD
VO
VIN
Rdistribution
Rcontact
Rcontact
COM
Rdistribution
VO
Rdistribution
COM
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
VO. IO
Efficiency
η =
VIN. IIN
x
100 %
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Input Filtering
The SLIN-20F1Ax module should be connected to a low ac-impedance source. A highly inductive source can
affect the stability of the module. An input capacitor must be placed directly adjacent to the input pin of the
module, to minimize input ripple voltage and ensure module stability.
To minimize input voltage ripple, low-ESR ceramic capacitors are recommended at the input of the module.
Figure A below shows the input ripple voltage for various output voltages at 20A of load current with 2x47 µF or
4x47 µF ceramic capacitors and an input of 5V. Figure B below shows data for the 3.3Vin case, with 2x47µF or
4x47µF of ceramic capacitors at the input.
160
160
Input Ripple Voltage (mVp-p)
Figure B
Input Ripple Voltage (mVp-p)
Figure A
150
140
130
2x47uF
120
4x47uf
110
100
90
80
0.5
1
1.5
2
2.5
3
Output Voltage (Vdc)
3.5
4
150
2x47uF
140
4x47uf
130
120
110
100
90
80
0.5
1
1.5
2
2.5
3
Output Voltage (Vdc)
Output Filtering
The SLIN-20F1Ax modules are designed for low output ripple voltage and will meet the maximum output ripple
specification with 0.1 µF ceramic and 10 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 ceramic and polymer capacitors are recommended to improve the dynamic
response of the module. Figure A on the next page provides output ripple information for different external
capacitance values at various Vo and for load currents of 20A while maintaining an input voltage of 5V. Figure B
on the next page shows the performance with a 3.3V input. 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 module can be achieved by using the Tunable LoopTM 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
12
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Fig. A
Fig. B
40
30
Ripple(mVp-p)
Ripple(mVp-p)
40
1x10uF External Cap
1x47uF External Cap
2x47uF External Cap
4x47uF External Cap
20
10
0.5
1
1.5
2
2.5
3
1x10uF External Cap
1x47uF External Cap
2x47uF External Cap
4x47uF External Cap
30
20
10
3.5
0.5
1
Output Voltage(Volts)
1.5
Output Voltage(Volts)
2
2.5
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, CSA C22.2 No. 60950-1-03, and VDE
0850:2004-09 (EN60950-1) Licensed.
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 fast-acting fuse with a maximum rating of 20A in the positive
input lead.
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
-0.2
Typ
-
Max
Vin-1.6
Unit
V
Vin-0.8
-
Vin,max
V
-0.2
-
0.3
V
Vin-0.8
-
Vin,max
V
Notes
The remote on/off pin open, Unit on.
The remote on/off pin open, Unit on.
The SLIN-20F1Ax 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, 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, the module turns OFF during logic High
and ON during logic Low. The On/Off signal is 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 A on the next
page. When the external transistor Q1 is in the OFF state, the On/Off pin is pulled high internally and the module
is ON. When transistor Q1 is turned ON, the On/Off pin is pulled low and the module is OFF.
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
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Remote On/Off (cont.)
For negative logic On/Off modules, the circuit configuration is shown in Figure B on the next page. The On/Off
pin should be pulled high with an external pull-up resistor (suggested value for the 2.4V to 5.5Vin range is
8.2Kohms). When transistor Q1 is in the OFF state, the On/Off pin is pulled high and the module is OFF. The
On/Off threshold for logic High on the On/Off pin depends on the input voltage and its minimum value is VIN –
1.6V. To turn the module ON, Q1 is turned ON pulling the On/Off pin low.
Fig. A
Fig. B
VIN+
VIN+
MODULE
MODULE
Rpullup
6.34K
6.34K
20K
I ON/OFF
I ON/OFF
ON/OFF
Q1
470
PWM Enable
470
+
VON/OFF
Q2
+
Q1
GND
PWM Enable
3.09K
VON/OFF
_
PTC
ON/OFF
_
GND
Over Current 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.
Over Temperature Protection
To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will
shutdown if the over temperature threshold of 144°C is exceeded at the thermal reference point Tref. The thermal
shutdown is not intended as a guarantee that the unit will survive temperatures beyond its rating. Once the unit
goes into thermal shutdown it will then wait to cool before attempting to restart.
Input Under-voltage Lockout
At input voltages below the input under voltage lockout limit, the module operation is disabled. The module will
begin to operate at an input voltage above the under voltage lockout turn-on threshold.
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Output Voltage Programming
The output voltage of the SLIN-20F1Ax module can be programmed to any voltage from 0.6dc to 3.63Vdc 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 the figure below. The Upper Limit curve shows that the entire output voltage range is available
with the maximum input voltage of 5.5V. The Lower Limit curve shows that for output voltages of 1.8V and
higher, the input voltage needs to be larger than the minimum of 2.4V.
6
Input Voltage (v)
5
Upper Limit
4
3
Lower Limit
2
1
0
0.5
1
1.5
2
2.5
3
3.5
4
Output Voltage (V)
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, use the following equation:
⎡ 1.2 ⎤
Rtrim = ⎢
⎥ kΩ
⎣ (Vo − 0.6 ) ⎦
Rtrim is the external resistor in kΩ
Vo is the desired output voltage
By using a ±0.5% tolerance trim resistor with a TC of ±25ppm, a set point tolerance of ±1.5% can be achieved as
specified in the electrical specification. Table 1 provides Rtrim values required for some common output
voltages.
Table 1
VO, set (V)
0.6
1.0
1.2
1.5
1.8
2.5
3.3
Rtrim (KΩ)
Open
3.0
2.0
1.333
1.0
0.632
0.444
Circuit configuration for programming output voltage using
an external resistor
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15
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Remote Sense
The SLIN-20F1Ax power modules have 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 must not exceed
0.5V. Note that the output voltage of the module cannot exceed the specified maximum value. This includes the
voltage drop between the SENSE and Vout pins. When the Remote Sense feature is not being used, connect
the SENSE pin to the VOUT pin.
Voltage Margining
Output voltage margining can be implemented in the SLIN-20F1Ax modules 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. The figure below shows the circuit configuration for output
voltage margining.
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rtrim
Q1
GND
Circuit Configuration for margining Output voltage
Monotonic Start-up and Shutdown
The SLIN-20F1Ax modules have monotonic start-up and shutdown behavior for any combination of rated input
voltage, output current and operating temperature range.
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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2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Output Voltage Sequencing
The SLIN-20F1Ax modules include a sequencing feature that enables users to implement various types of output
voltage sequencing in their applications. This is accomplished via an additional sequencing pin. When not using
the sequencing feature, either tie the SEQ pin to VIN or leave it unconnected.
When an analog voltage is applied to the SEQ pin, the output voltage tracks this voltage until the output reaches
the set-point voltage. The final value of the SEQ voltage must be set higher than the set-point voltage of the
module. The output voltage follows the voltage on the SEQ pin on a one-to-one basis. By connecting multiple
modules together, multiple modules can track their output voltages to the voltage applied on the SEQ pin.
For proper voltage sequencing, first, input voltage is applied to the module. The On/Off pin of the module is left
unconnected (or tied to GND for negative logic modules or tied to VIN for positive logic modules) so that the
module is ON by default. After applying input voltage to the module, a minimum 10msec delay is required before
applying voltage on the SEQ pin. During this time, a voltage of 50mV (± 20 mV) must be maintained on the SEQ
pin. This can be done by applying the sequencing voltage through a resistor R1connected in series with the SEQ
pin. By choosing R1 according to the following equation:
R1 =
24950
ohms
V IN − 0.05
the voltage at the sequencing pin will be 50mV when the sequencing signal is at zero.
MODULE
VIN+
499K
+
OUT
R1
SEQ
10K
-
GND
Circuit showing connection of the sequencing signal to the SEQ pin
After the 10msec delay, an analog voltage is applied to the SEQ pin and the output voltage of the module will
track this voltage on a one-to-one volt basis until the output reaches the set-point voltage. To initiate
simultaneous shutdown of the modules, the SEQ pin voltage is lowered in a controlled manner. The output
voltage of the modules tracks the voltages below their set-point voltages on a one-to-one basis. A valid input
voltage must be maintained until the tracking and output voltages reach ground potential.
When using the sequencing feature to control start-up of the module, pre-bias immunity during start-up is
disabled. The pre-bias immunity feature of the module relies on the module being in the diode-mode during startup. When using the sequencing feature, modules goes through an internal set-up time of 10msec, and will be in
synchronous rectification mode when the voltage at the SEQ pin is applied. This will result in the module sinking
current if a pre-bias voltage is present at the output of the module. When pre-bias immunity during start-up is
required, the sequencing feature must be disabled. For additional guidelines on using the sequencing feature
please contact the Bel Power technical representatives for additional information.
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
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Tunable LoopTM
The SLIN-20F1Ax modules have a new feature that optimizes transient response of the module called Tunable
LoopTM.
External capacitors are usually added to the output of the module for two reasons: to reduce output ripple and
noise 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.
The Tunable LoopTM allows the user to externally adjust the voltage control loop to match the filter network
connected to the output of the module. The Tunable LoopTM is implemented by connecting a series R-C between
the SENSE and TRIM pins of the module. This R-C allows the user to externally adjust the voltage loop feedback
compensation of the module.
VOUT
SENSE
RTUNE
MODULE
CO
CTUNE
TRIM
GND
RTrim
Circuit diagram showing connection of RTUNE 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, 3, 4
and 5. Tables 2 and 4 show the recommended values of RTUNE and CTUNE for different values of ceramic output
capacitors up to 1000μF that might be needed for an application to meet output ripple and noise requirements for
5Vin and 3.3Vin respectively. Selecting RTUNE and CTUNE according to Tables 2 and 4 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 and 5 list 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 10A to 20A step change
(50% of full load), with an input voltage of 5Vin and 3.3Vin respectively.
Table 2.General recommended values of RTUNE and CTUNE for Vin=5V and various external ceramic capacitor
combinations.
Co
RTUNE
CTUNE
1x47μF
47
3300pF
2x47μF
47
6800pF
4x47μF
47
12nF
10x47μF 20x47μF
33
22
33nF
56nF
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Table 3.Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 10A step load
with Vin=5V.
Vo
3.3V
Co
2x 330μF
Polymer Cap
RTUNE
CTUNE
ΔV
47
39nF
64mV
2.5V
2x47μF +
2x330μF
Polymer Cap
39
47nF
49mV
1.8V
3x330μF
Polymer Cap
39
150nF
36mV
1.2V
4x47μF
+ 4x330μF
Polymer Cap
33
220nF
24mV
0.6V
10x330μF
Polymer Cap
27
330nF
12mV
Table 4. General recommended values of RTUNE and CTUNE for Vin=3.3V and various external ceramic capacitor
combinations.
Cext
RTUNE
CTUNE
1x47μF
47
6800pF
2x47μF
47
12nF
4x47μF
33
22nF
10x47μF
33
47nF
20x47μF
22
68nF
Table 5. Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 10A step
load with Vin=3.3V
Vo
Co
RTUNE
CTUNE
ΔV
2.5V
5x330μF
Polymer Cap
27
470nF
48mV
1.8V
4x330μF
Polymer Cap
27
470nF
36mV
1.2V
5x330μF
Polymer Cap
27
470nF
24mV
0.6V
11x330μF
Polymer Cap
22
470nF
12mV
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Thermal Considerations
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 below.
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
Thermal Test Setup
The thermal reference point, Tref, used in the specifications is shown below. For reliable operation the
temperatures at this point should not exceed 125oC. The output power of the module should not exceed the rated
power of the module (Vo,set x Io,max).
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Example Application Circuit
Requirements:
Vin:
Vout:
Iout:
ΔVout:
Vin, ripple
3.3V
1.8V
15A max., worst case load transient is from 10A to 15A
1.5% of Vout (27mV) for worst case load transient
1.5% of Vin (50mV, p-p)
Vin+
Vout+
VOUT
S+
VIN
RTUNE
+
CI2
MODULE
CI1
CTUNE
Q1
ON/OFF
GND
CI1
CI2
CO1
CO2
CTune
RTune
RTrim
CO1
+
CO2
TRIM
S-
RTrim
200uF/16V bulk electrolytic
5 x 47uF/6.3V ceramic capacitor (e.g. Murata GRM32ER60J476ME20)
6 x 47uF/6.3V ceramic capacitor (e.g. Murata GRM32ER60J476ME20)
2 x 470uF/2.5V Low ESR Polymer/poscap (e.g. Sanyo Poscap 2R5TPL470M7)
330nF/50V ceramic capacitor (can be 1206, 0805 or 0603 size)
27 ohms SMT resistor (can be 1206, 0805 or 0603 size)
1kΩ SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
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December 2, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline
PIN
1
2
3
4
5
6
7
8
9
10
FUNCTION
ON/OFF
VIN
SEQ
GND
VOUT
TRIM
S+
SNC
NC
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
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Mechanical Outline (continued)
Recommended Pad Layout
Pin 10
Pin 9
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.)
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
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Packaging Details
The SLIN-20F1Ax modules are supplied in tape & reel as standard.
All Dimensions are in millimeters and (in inches).
Reel Dimensions:
Outside Dimensions:
Inside Dimensions:
Tape Width:
330.2 mm (13.00’’)
177.8 mm (7.00”)
44.00 mm (1.73”)
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Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
Surface Mount Information
Pick and Place
The SLIN-20F1Ax 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
is able to withstand reflow temperatures of up to 300oC.
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.
Lead Free Soldering
The SLIN-20F1Ax modules are lead-free (Pb-free) and RoHS compliant and are both forward and backward
compatible in a Pb-free and a SnPb soldering process. Failure to observe the instructions 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. The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using
Sn/Ag/Cu solder is shown below.
300
Per J-STD-020 Rev. C
Peak Temp 260°C
Reflow Temp (°C)
250
200
* Min. Time Above 235°C
15 Seconds
150
Heating Zone
1°C/Second
Cooling
Zone
*Time Above 217°C
60 Seconds
100
50
0
Reflow Time (Seconds)
Recommended linear reflow profile using Sn/Ag/Cu solder
MSL Rating
The SLIN-20F1Ax modules have a MSL rating of 2.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
25
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
December 2, 2010
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.
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.
Revision History
Date
Revision
Changes Detail
Approval
2010-4-14
A
First release
T. Bubriski
2010-12-2
B
Updated the Example Application Circuit on page 21.
T. Bubriski
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
©2010 Bel Fuse Inc. Specifications subject to change without notice. 120210
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