BEL SLIN

NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
SLIN-20E1Ax
RoHS Compliant
Rev.D
Features
•
Wide Input Voltage Range
•
Ability to Sink and Source Current
•
Fixed Switching Frequency
•
Over Temperature Protection
•
Power Good Signal
•
Output Over Current Protection
•
•
•
Remote Sense
• Remote On/Off
TM
(a registered trademark of Lineage Power Systems) to
Tunable Loop
Optimize Dynamic output voltage response
Flexible output voltage sequencing
•
Fixed switching frequency and ability to synchronize with external clock
•
Class 1, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592)
•
Compliant to RoHS EU Directive 2002/95/EC
•
Compatible in a Pb-free or SnPb reflow environment
•
UL* 60950-1Recognized, CSA† C22.2 No. 60950-1-03 Certified
•
VDE‡ 0805:2001-12 (EN60950-1) Licensed
Applications
•
Distributed power architectures
•
Servers and storage applications
•
Intermediate bus voltage applications
•
Networking equipment
•
Telecommunications equipment
•
Industrial equipment
Description
The SLIN-20E1Ax 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 = 4.5Vdc-14Vdc) and provide a precisely
regulated output voltage from 0.69Vdc to 5.5Vdc, programmable via an external resistor. Two new features
added with this family of products are frequency synchronization and the Tunable LoopTM. Other features include
remote On/Off, adjustable output voltage, over current and over temperature protection, power good and output
voltage sequencing. 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
0.69 Vdc - 5.5 Vdc
4.5 Vdc - 14 Vdc
Max. Output
Current
20 A
Typical
Efficiency
90%
Model Number
Active High
SLIN-20E1A0
Model Number
Active Low
SLIN-20E1AL
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Part Number Explanation
S LIN – 20 E 1A 0
1
2
3 4
5
6
1---Surface mount
2---Series code
3---Output current (20A)
4--- Wide input voltage range (4.5-14V)
5--- Wide output voltage range (0.69-5.5V)
6--- Enable, active high, change “0” to “L” means
active low
Absolute Maximum Ratings
Min
Typ
Max
Unit
Continuous Input Voltage
-0.3
-
15
V
Voltage on SEQ terminal, SYNC
and PG terminals
-0.3
-
6
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
4.5
Typ
-
Max
14
Unit
V
Input Current (full load)
-
-
20
A
-
42
-
mA
Vo=0.69V, VIN=10V, IO=0, module enabled
-
74
-
mA
Vo=3.3V, VIN=12V, IO=0, module enabled
Input Stand-by Current
-
3
-
mA
VIN = 12V, module disabled
Input Reflected Ripple Current
(pk-pk)
-
43
-
mA
5Hz to 20MHz, 1μH source impedance; VIN
=4.5 to 14V, IO= IOmax
I2t Inrush Current Transient
-
-
1
A2s
Input Ripple Rejection (120Hz)
-
45
-
dB
Turn-on Threshold
-
4.45
-
V
Turn-off Threshold
-
4.2
-
V
Hysteresis
-
0.25
-
V
Input Current (no load)
Notes
VIN=4.5V to 14V
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Output Specifications
Parameter
Min
Typ
Max
Unit
Output Voltage Set Point
-1.5
-
+1.5
%Vo,set
Output Voltage
-2.5
-
+2.5
%Vo,set
Adjustment Range1
0.69
-
5.5
V
-
-
0.5
V
VO ≥ 2.5V
VO < 2.5V
-
-
10
5
mV
mV
VO ≥ 2.5V
VO < 2.5V
-
-
0.4
10
%Vo,set
mV
VIN=VIN, min to VIN, max
Temperature Regulation
(-40°C to +85°C)
-
-
0.5
%Vo,set
VO < 2.5V, Tref=TA, min to TA, max
Ripple and Noise (pk-pk)
-
30
80
mV
Ripple and Noise (rms)
-
14
28
mV
Output Current Range
0
-
20
A
Output DC Current Limit
-
120
-
%Io,max
Output Short-Circuit Current
-
2.6
-
A
Vo≤250mV, Hiccup Mode
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)
-
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,set
Vin=Vin, min to Vin, max, Io=Io, min to Io, max,
With or without maximum external capacitance
Remote Sense Range
Notes
Over all operating input voltage, resistive load,
and temperature conditions until end of life
selected by an external resistor
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 // 10 μF ceramic capacitors)
Hiccup Mode
2
Output Capacitance
ESR≥ 1 mΩ
ESR≥0.15 mΩ
ESR≥ 10 mΩ
Turn-On Delay Time
Dynamic Load Response
△V50%~100%
Peak Deviation
-
380
-
mV
of Max Load
Settling Time
-
30
-
uS
△V100%~50%
Peak Deviation
-
300
-
mV
of Max Load
Settling Time
-
30
-
uS
di/dt=10A/us, Vin=Vin,nom, Vo=1.5V,
Ta=25°C, Co=0
Notes: 1. Some output voltages may not be possible depending on the input voltage.
2. External capacitors may require using the new Tunable LoopTM feature to ensure that the module is
stable as well as getting the best transient response (See the Tunable LoopTM section for details).
3. 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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
General Specifications
Parameter
Min
Typ
Max
Unit
-
72.1
81.3
85.7
88.0
89.7
91.8
-
%
%
%
%
%
%
Switching Frequency
-
550
-
kHz
Over Temperature Protection
-
135
-
°C
10
-
-
mS
-
-
150
100
mV
mV
84
-
7
116
50
%Vo,set
Ω
-
6.05
-
g
Notes
Efficiency
Vo=0.69V
Vo=1.2V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Vo=5.0V
Sequencing Delay time
Tracking Accuracy
Power-Up: 2V/ms
Power-Down: 2V/ms
PGOOD (Power Good)
Output Voltage Limit for PGOOD
Pulldown resistance of PGOOD pin
Weight
MTBF
14,262,200 hours
hours
1.30 x 0.53 x 0.334
33.02 x 13.46 x 8.5
-
Vin= 12Vdc, Ta=25°C
Io=Io, max , Vo= Vo,set
Delay from VIN, min to application of
voltage on SEQ pin
Vin, min to Vin, max; Io, min to Io,
max, Vseq < Vo
Signal Interface Open Drain,
Vsupply ≤ 5Vdc
Calculated Per Bell Core SR-332
(Io=0.8Io, max, Vo=5,V Ta=40°C,
Telecordia Method Issue 2,
Method I Case 3)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Frequency Synchronization
Synchronization Frequency Range
520
-
600
KHz
High-Level Input Voltage
2.5
-
-
V
Low-Level Input Voltage
-
-
0.8
V
Input Current, SYNC
-
-
1
mA
Minimum Pulse Width, SYNC
250
-
-
nS
Minimum Setup/Hold Time, SYNC
250
-
-
nS
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Efficiency Data
90
95
90
EFFICIENCY, η (%)
EFFICIENCY, η (%)
85
80
Vin=5V
Vin=7V
75
Vin=10V
70
85
Vin=4.5V
80
Vin=12V
70
0
5
10
15
20
0
5
OUTPUT CURRENT, IO (A)
15
20
Vo=1.2V
100
95
95
EFFICIENCY, η (%)
90
EFFICIENCY, η (%))
10
OUTPUT CURRENT, IO (A)
Vo=0.69V
Vin=4.5V
85
Vin=12V
Vin=14V
80
75
70
90
Vin=4.5V
85
Vin=12V
Vin=14V
80
75
70
0
5
10
15
0
20
OUTPUT CURRENT, IO (A)
5
15
20
Vo=2.5V
100
95
95
EFFICIENCY, η (%)
100
90
Vin=4.5V
Vin=12V
85
10
OUTPUT CURRENT, IO (A)
Vo=1.8V
EFFICIENCY, η (%))
Vin=14V
75
Vin=14V
80
75
70
90
Vin=4.5V
Vin=12V
Vin=14V
85
80
75
70
0
5
10
OUTPUT CURRENT, IO (A)
Vo=3.3V
15
20
0
5
10
15
20
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
22
22
20
20
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
Thermal Derating Curves
18
16
2m/s
(400LFM)
14
1m/s
(200LFM)
0.5m/s
(100LFM)
12
NC
10
8
6
25
35
45
55
65
75
18
16
2m/s
(400LFM)
14
1m/s
(200LFM)
12
0.5m/s
(100LFM)
10
NC
8
6
85
25
O
35
20
20
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
22
18
16
2m/s
(400LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
10
NC
8
6
35
45
55
65
75
16
14
2m/s
(400LFM)
12
1m/s
(200LFM)
10
0.5m/s
(100LFM)
8
25
35
20
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
20
18
16
2m/s
(400LFM)
1m/s
(200LFM)
0.5m/s
(100LFM)
NC
6
35
45
55
65
75
O
AMBIENT TEMPERATURE, TA C
Vo=3.3V
65
75
85
Vo=2.5V
22
25
55
AMBIENT TEMPERATURE, TA C
22
8
45
O
Vo=1.8V
10
NC
6
85
AMBIENT TEMPERATURE, TA C
12
85
18
O
14
75
Vo=1.2V
22
25
65
AMBIENT TEMPERATURE, TA C
Vo=0.69V
12
55
O
AMBIENT TEMPERATURE, TA C
14
45
85
18
16
2m/s
(400LFM)
14
12
1m/s
(200LFM)
10
8
0.5m/s
(100LFM)
NC
6
25
35
45
55
65
75
85
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT VOLTAGE
VO (V) (10mV/div)
Ripple and Noise Waveforms
TIME, t (1μs/div)
TIME, t (1μs/div)
Vo=1.2V, Io = Io,max
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
Vo=0.69V, Io = Io,max
TIME, t (1μs/div)
TIME, t (1μs/div)
Vo=2.5V, Io = Io,max
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
Vo=1.8V, Io = Io,max
TIME, t (1μs/div)
Vo=3.3V, Io = Io,max
TIME, t (1μs/div)
Vo=5.0V, 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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
OUTPUT VOLTAGE
VO (V) (200mV/div)
Transient Response to Dynamic Load Change from
0% to 50% to 0%. Vo=1.2V
TIME, t (20μs /div)
Transient Response to Dynamic Load Change from
0% to 50% to 0%. Vo=2.5V
OUTPUT VOLTAGE
VO (V) (200mV/div)
OUTPUT VOLTAGE
VO (V) (200mV/div)
OUTPUT CURRENT,
IO (A) (5Adiv)
OUTPUT VOLTAGE
VO (V) (200mV/div)
OUTPUT CURRENT,
IO (A) (5Adiv)
TIME, t (20μs /div)
Transient Response to Dynamic Load Change from
0% to 50% to 0%. Vo=1.8V
OUTPUT CURRENT,
IO (A) (5Adiv)
TIME, t (20μs /div)
OUTPUT VOLTAGE
VO (V) (200mV/div)
Transient Response to Dynamic Load Change from
0% to 50% to 0%. Vo=0.69V
OUTPUT CURRENT,
IO (A) (5Adiv)
TIME, t (20μs /div)
TIME, t (20μs /div)
Transient Response to Dynamic Load Change from
0% to 50% to 0%. Vo=3.3V
OUTPUT CURRENT,
IO (A) (5Adiv)
OUTPUT CURRENT,
IO (A) (5Adiv)
OUTPUT VOLTAGE
VO (V) (200mV/div)
Transient Response Waveforms
TIME, t (20μs /div)
Transient Response to Dynamic Load Change from
0% to 50% to 0%. 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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
ON/OFF VOLTAGE OUTPUT VOLTAGE
VON/OFF (V) (5V/div) VO (V) (500mV/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=0.69V
TIME, t (1 ms/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE
VO (V) (1V/div)
VON/OFF (V) (2V/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.8V
TIME, t (1 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=3.3V
ON/OFF VOLTAGE OUTPUT VOLTAGE
VO (V) (500mV/div)
VON/OFF (V) (5V/div)
TIME, t (1 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.2V
ON/OFF VOLTAGE OUTPUT VOLTAGE
VO (V) (1V/div)
VON/OFF (V) (5V/div)
TIME, t (2 ms/div)
TIME, t (1 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=2.5V
ON/OFF VOLTAGE OUTPUT VOLTAGE
VO (V) (2V/div)
VON/OFF (V) (5V/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE
VO (V) (200mV/div)
VON/OFF (V) (5V/div)
Startup Time
TIME, t (1 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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
OUTPUT VOLTAGE
VO (V) (500mV/div)
OUTPUT VOLTAGE
VO (V) (1V/div)
TIME, t (2ms/div)
TIME, t (2ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max),
Vo=2.5V
OUTPUT VOLTAGE
VO (V) (2V/div)
OUTPUT VOLTAGE
VO (V) (1V/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=1.8V
INPUT VOLTAGE
VIN (V) (5V/div)
TIME, t (2ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=1.2V
INPUT VOLTAGE
VIN (V) (5V/div)
INPUT VOLTAGE
VIN (V) (5V/div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max),
Vo=0.69V
INPUT VOLTAGE
VIN (V) (5V/div)
TIME, t (2ms/div)
TIME, t (2ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ),
Vo=3.3V
INPUT VOLTAGE
VIN (V) (5V/div)
INPUT VOLTAGE
VIN (V) (5V/div)
OUTPUT VOLTAGE
VO (V) (200mV/div)
Startup Time (continued)
TIME, t (2ms/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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Input Filtering
The SLIN-20E1Ax should be connected to a low ac-impedance source. A highly inductive source can affect the
stability of the module. Input capacitance 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 polymer and ceramic capacitors are recommended at the input of the
module.
To minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. Below figure
shows the input ripple voltage for various output voltages at 20A of load current with 2x22 µF or 3x22 µF ceramic
capacitors and an input of 12V.
300
2x22uF
250
3x22 uF
200
150
100
50
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Note: Input ripple voltage for various output voltages with 2x22 µF or 3x22 µF ceramic capacitors at the input
(20A load). Input voltage is 12V.
Output Filtering
The SLIN-20E1Ax 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 polymer and ceramic capacitors are recommended to improve the dynamic
response of the module. The figure on the next page provides output ripple information for different external
capacitance values at various Vo and for a full load current of 20A. 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.
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12
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Output Filtering (continued)
40
1x10uF External Cap
1x47uF External Cap
2x47uF External Cap
4x47uF External Cap
Ripple (mVp-p)
30
20
10
0
0.5
1.5
2.5
3.5
Output Voltage (Volts)
4.5
5.5
Note: Output ripple voltage for various output voltages with external 1x10 µF, 1x47 µF, 2x47 µF or 4x47 µF
ceramic capacitors at the output (20A 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, CSA C22.2 No. 60950-1-03, and VDE
0850:2001-12 (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.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
13
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4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Remote On/Off
Parameter
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Min
0
Typ
-
Max
1
Unit
V
2.0
-
Vin,max
V
-
-
3.5
V
Vin-1
-
Vin,max
V
Active Low
Active High
Notes
The remote on/off pin open, Unit off.
The remote on/off pin open, Unit on.
The SLIN-20E1Ax 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 below. When the external
transistor Q1 is in the OFF state, the internal PWM Enable signal is pulled high through an internal 24.9kΩ
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 20kΩ.
MODULE
VIN+
Rpullup
24.9K
22K
I ON/OFF
ON/OFF
PWM Enable
Q2
23K
+
VON/OFF
Q1
GND
Q3
22K
12.1K
22K
_
Circuit configuration for using positive On/Off logic
For negative logic On/Off modules, the circuit configuration is shown below. The On/Off pin should be pulled high
with an external pull-up resistor (suggested value for the 4.5V to 14V input range is 20Kohms). When transistor
Q1 is in the OFF state, the On/Off pin is pulled high, internal transistor Q2 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 Q2 OFF resulting in the
PWM Enable pin going high and the module turning ON.
VIN+
MODULE
Rpullup1
24.9K
PWM Enable
I ON/OFF
ON/OFF
+
VON/OFF
22K
Q1
GND
23K
Q2
12.1K
_
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
14
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
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 135°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.
Output Voltage Programming
The output voltage of the SLIN-20E1Ax can be programmed to any voltage from 0.69dc 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 below figure. The Upper Limit curve shows that for output voltages of 0.9V and lower, the input voltage
must be lower than the maximum of 14V. The Lower Limit curve shows that for output voltages of 3.3V and
higher, the input voltage needs to be larger than the minimum of 4.5V.
16
Input Voltage (v)
14
12
Upper Limit
10
8
6
4
Lower Limit
2
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Output Voltage (V)
Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for
different input voltages.
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4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Output Trim Equations
Without an external resistor between Trim and GND pins, the output of the module will be 0.69Vdc. To calculate
the value of the trim resistor, Rtrim, for a desired output voltage, use the following equation:
⎡
⎤
6.9
Rtrim = ⎢
⎥ kΩ
(
)
Vo
−
0
.
69
⎣
⎦
Rtrim is the external resistor in kΩ
Vo is the desired output voltage.
Table 1 provides Rtrim values required for some common output voltages.
Table 1
VO, set (V)
0.7
1.0
1.2
1.5
1.8
2.5
3.3
5.0
Rtrim (KΩ)
690
22.26
13.53
8.519
6.216
3.812
2.644
1.601
By using a ±0.5% tolerance trim resistor with a TC of ±100ppm, a set point tolerance of ±1.5% can be achieved
as specified in the electrical specification.
Remote Sense
The SLIN-20E1Ax power modules have a Remote Sense feature to minimize the effects of distribution losses by
regulating the voltage between the S+ and S– pins. The voltage between the S– and GND pins of the module
must not drop below –0.2V. If Remote Sense is being used, the voltage between S+ and S– cannot be more
than 0.5V larger than the voltage between VOUT and GND. Note that the output voltage of the module cannot
exceed the specified maximum value. When the Remote Sense feature is not being used, connect the S+ pin to
the VOUT pin and the S– pin to the GND pin.
V IN(+)
VO (+)
VS+
ON/OFF
LOAD
TRIM
R tri m
GND
Circuit configuration for programming output voltage using an external resistor
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Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Startup into Pre-biased Output
The SLIN-20E1Ax modules can start into a prebiased output as long as the prebias voltage is 0.5V less than the
set output voltage. Note that prebias operation is not supported when output voltage sequencing is used.
Voltage Margining
Output voltage margining can be implemented in the SLIN-20E1Ax 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.
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rtrim
Q1
GND
Circuit Configuration for margining Output voltage
Monotonic Start-up and Shutdown
The SLIN-20E1Ax modules have monotonic start-up and shutdown behavior for any combination of rated input
voltage, output current and operating temperature range.
Output Voltage Sequencing
The SLIN-20E1Ax 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 volt 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.
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Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Output Voltage Sequencing (continued)
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) is maintained on the SEQ pin.
This can be done by applying the sequencing voltage through a resistor R1 connected in series with the SEQ pin.
This delay gives the module enough time to complete its internal power-up soft-start cycle. During the delay time,
the SEQ pin should be held close to ground (nominally 50mV ± 20 mV). This is required to keep the internal opamp out of saturation thus preventing output overshoot during the start of the sequencing ramp. By selecting
resistor R1 according to the following equation:
R1 =
24950
V IN − 0.05
ohms
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 bases 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 representative 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
18
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Power Good
The SLIN-20E1Ax modules provide 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 over temperature, over current or loss of regulation
occurs that would result in the output voltage going ±10% outside the set point value. The PGOOD terminal
should be connected through a pull-up resistor (suggested value 100KΩ) to a source of 5VDC or less.
Synchronization
The SLIN-20E1Ax modules can be synchronized using an external signal. Details of the SYNC signal are
provided in the Electrical Specifications table. If the synchronization function is not being used, leave the SYNC
pin floating.
Tunable LoopTM
The SLIN-20E1Ax 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, as shown below. 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 below Tables 2
and 3. Table 2 shows the recommended values of RTUNE and CTUNE for different values of ceramic output
capacitors up to 470uF 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 10A to 20A step change (50% of
full load), with an input voltage of 12V.
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Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Tunable LoopTM (continued)
Table 2.General recommended values of RTUNE and CTUNE for Vin=12V and various external ceramic capacitor
combinations.
Co
RTUNE
CTUNE
1x47μF
240
1500pF
2x47μF
240
2700pF
4x47μF
240
5600pF
10x47μF 20x47μF
150
150
12nF
15nF
Table 3.Recommended values of RTUNE and CTUNE to obtain transient deviation of ≤2% of Vout for a 10A step
load with Vin=12V.
Vo
Co
RTUNE
CTUNE
ΔV
5V
3.3V
5x47μF + 330μF
6x47μF
Polymer
220
220
5600pF
7500pF
99mV
66mV
2.5V
2x330μF
Polymer
200
18nF
50mV
1.8V
1.2V
6x47μF + 2x 330μF 6x47μF + 4x330μF
Polymer
Polymer
150
150
33nF
120nF
36mV
24mV
0.69V
12x330μF
Polymer
150
120nF
12mV
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
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Thermal Considerations (continued)
The preferred airflow direction and the thermal reference points, Tref, used in the specifications are also shown
below. For reliable operation the temperatures at these points should not exceed 125oC. The output power of the
module should not exceed the rated power of the module (Vo,set x Io,max).
Preferred airflow direction and location of hot-spot of the module (Tref).
Example Application Circuit
Requirements:
Vin:
Vout:
Iout:
ΔVout:
Vin, ripple
12V
1.8V
15A max., worst case load transient is from 10A to 15A
1.5% of Vout (36mV) for worst case load transient
1.5% of Vin (180mV, 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
2 x 22μF/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)
200μF/16V bulk electrolytic
5 x 47μF/6.3V ceramic capacitor (e.g. Murata GRM31CR60J476ME19)
2 x 330μF/6.3V Polymer (e.g. Sanyo, Poscap)
22nF ceramic capacitor (can be 1206, 0805 or 0603 size)
150 ohms SMT resistor (can be 1206, 0805 or 0603 size)
6.19kΩ SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
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Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Mechanical Outline
Top View
Side View
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Mechanical Outline (continued)
Recommended Pad Layout
PIN
FUNCTION
1
ON/OFF
2
VIN
3
SEQ
4
GND
5
VOUT
6
TRIM
7
S+
8
S-
9
PGOOD
10
SYNC
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.)
Note: This module is recommended and compatible with Pb-Free Reflow Soldering and must be soldered
using a reflow profile with a peak temperature of no more than 260 ºC for less than 5 seconds.
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Packaging Details
The SLIN-20E1Ax modules are supplied in tape & reel as standard. Modules are shipped in quantities of 250
modules per reel.
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”)
24.00 mm (0.945”)
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24
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
Surface Mount Information
Pick and Place
The SLIN-20E1Ax 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. The label also carries product information such as part
number and serial number.
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-20E1Ax 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. The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using
Sn/Ag/Cu solder is shown in the figure below. Soldering outside of the recommended profile requires testing to
verify results and performance.
MSL Rating
The SLIN-20E1Ax modules have a MSL rating of 2.
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.
300
Per J-STD-020 Rev. C
Peak Temp 260°C
Reflow Temp (°C)
250
200
* Min. Time Above 235°C
15 Seconds
Cooling
Zone
150
Heating Zone
1°C/Second
*Time Above 217°C
60 Seconds
100
50
0
Reflow Time (Seconds)
Recommended linear reflow profile using Sn/Ag/Cu solder.
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25
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4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
October 8, 2009
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
2009-6-10
A
First release
2009-6-25
B
Section “Surface Mount Information” added.
Approval
T. Bubriski
TM
T. Bubriski
2009-9-1
C
Tunable Loop
logo added.
T. Bubriski
2009-10-8
D
Updated Startup Time waveforms on page 10.
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.
©2009 Bel Fuse Inc. Specifications subject to change without notice.10/08/09
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