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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.
RoHS Compliant
* * *
SLIN-20E1Ax Features
* * * * * * * * * * * *
Rev.D
Wide Input Voltage Range Fixed Switching Frequency Power Good Signal
Ability to Sink and Source Current Over Temperature Protection 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 Intermediate bus voltage applications Telecommunications equipment * * * Servers and storage applications Networking 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 0.69 Vdc - 5.5 Vdc Input Voltage 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
Part Number Explanation
S LIN - 20 E 1A 0
1 2 34 5 6 1---Surface mount 2---Series code 3---Output current (20A)
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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
Parameter Continuous Input Voltage Voltage on SEQ terminal, SYNC and PG terminals Operating Ambient Temperature Storage Temperature Min -0.3 -0.3 -40 -55 Typ Max 15 6 85 125 Unit V V C C 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 Input Current (full load) Input Current (no load) Input Stand-by Current Input Reflected Ripple Current (pk-pk) I2t Inrush Current Transient Input Ripple Rejection (120Hz) Turn-on Threshold Turn-off Threshold Hysteresis Min 4.5 Typ 42 74 3 43 45 4.45 4.2 0.25 Max 14 20 1 Unit V A mA mA mA mA A2s dB V V V VIN=4.5V to 14V Vo=0.69V, VIN=10V, IO=0, module enabled Vo=3.3V, VIN=12V, IO=0, module enabled VIN = 12V, module disabled 5Hz to 20MHz, 1H source impedance; VIN =4.5 to 14V, IO= IOmax Notes
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
Output Specifications
Parameter Output Voltage Set Point Output Voltage Adjustment Range1 Remote Sense Range Load Regulation VO 2.5V VO < 2.5V Line Regulation VO 2.5V VO < 2.5V Temperature Regulation (-40C to +85C) Ripple and Noise (pk-pk) Ripple and Noise (rms) Output Current Range Output DC Current Limit Output Short-Circuit Current Output Capacitance ESR 1 m ESR0.15 m ESR 10 m
2
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Min -1.5 -2.5 0.69 0 0 0 0 Typ 30 14 120 2.6 2 Max +1.5 +2.5 5.5 0.5 10 5 0.4 10 0.5 80 28 20 200 1000 10000 Unit %Vo,set %Vo,set V V mV mV %Vo,set mV %Vo,set mV mV A %Io,max A uF uF uF mS Hiccup Mode Vo250mV, Hiccup Mode Without the Tunable LoopTM With the Tunable LoopTM With the Tunable LoopTM 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) 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) time for Vo to rise from 10% of Vo, set to 90% of Vo, set Vin=Vin, min to Vin, max, Io=Io, min to Io, max, With or without maximum external capacitance mV uS mV uS di/dt=10A/us, Vin=Vin,nom, Vo=1.5V, Ta=25C, Co=0 IO=IO, min to IO, max Over all operating input voltage, resistive load, and temperature conditions until end of life selected by an external resistor Notes
VIN=VIN, min to VIN, max VO < 2.5V, Tref=TA, min to TA, max 5Hz to 20MHz BW, VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1F // 10 F ceramic capacitors)
Turn-On Delay Time 2 mS
Output voltage Rise time Output voltage overshoot Dynamic Load Response
V50%~100%
-
5 -
3
mS %Vo,set
Peak Deviation Settling Time Peak Deviation Settling Time
-
380 30 300 30
-
of Max Load
V100%~50%
of Max Load
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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Min Vo=0.69V Vo=1.2V Vo=1.8V Vo=2.5V Vo=3.3V Vo=5.0V 10 84 Typ 72.1 81.3 85.7 88.0 89.7 91.8 550 135 7 6.05 14,262,200 hours Max 150 100 116 50 Unit % % % % % % kHz C mS mV mV %Vo,set g hours Calculated Per Bell Core SR-332 (Io=0.8Io, max, Vo=5,V Ta=40C, Telecordia Method Issue 2, Method I Case 3) 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 Notes Vin= 12Vdc, Ta=25C Io=Io, max , Vo= Vo,set
General Specifications
Parameter Efficiency
Switching Frequency Over Temperature Protection 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 Dimensions Inches (L x W x H) Millimeters (L x W x H) Frequency Synchronization Synchronization Frequency Range High-Level Input Voltage Low-Level Input Voltage Input Current, SYNC Minimum Pulse Width, SYNC Minimum Setup/Hold Time, SYNC
1.30 x 0.53 x 0.334 33.02 x 13.46 x 8.5 520 2.5 250 250 600 0.8 1 -
-
KHz V V mA nS 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
Efficiency Data
90
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
95
85
90
EFFICIENCY, (%)
EFFICIENCY, (%)
85 Vin=4.5V 80 Vin=12V 75 Vin=14V
80 Vin=5V 75 Vin=10V 70 0 5 10 15 20 Vin=7V
70 0 5 10 15 20
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Vo=0.69V
95 100 95
Vo=1.2V
90
EFFICIENCY, (%))
EFFICIENCY, (%)
85
Vin=4.5V Vin=12V Vin=14V
90 85 80 75 70 Vin=4.5V Vin=12V Vin=14V
80
75
70 0 5 10 15 20
0
5
10
15
20
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Vo=1.8V
100 95 100 95
Vo=2.5V
EFFICIENCY, (%))
90 Vin=4.5V 85 80 75 70 0 5 10 15 20 Vin=12V Vin=14V
EFFICIENCY, (%)
90 85 80 75 70 0 5
Vin=4.5V
Vin=12V
Vin=14V
10
15
20
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Vo=3.3V
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
Thermal Derating Curves
22 20
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
22 20
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
18 16 14 12 10 8 6 25 35 45 55 65
O
18 16 14 12 10 8 6 25 35 45 55 65
O
2m/s (400LFM)
1m/s (200LFM) 0.5m/s (100LFM) NC
2m/s (400LFM)
1m/s (200LFM) 0.5m/s (100LFM) NC
75
85
75
85
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
Vo=0.69V
22 20 22 20
Vo=1.2V
OUTPUT CURRENT, Io (A)
18 16 14 12 10 8 6 25 35 45 55 65 75
O
OUTPUT CURRENT, Io (A)
18 16 14 12 10 8 6 25 35 45 55 65
O
2m/s (400LFM) 1m/s (200LFM) 0.5m/s (100LFM) NC
2m/s (400LFM) 1m/s (200LFM) 0.5m/s (100LFM) NC
85
75
85
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
Vo=1.8V
22 20 18 16 14 12 10 8 6 25 35 45 55 65
O
Vo=2.5V
22 20
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
18 16 14 12 10 8 6 25 35 45 55 65
O
2m/s (400LFM) 1m/s (200LFM) 0.5m/s (100LFM) NC 85
2m/s (400LFM) 1m/s (200LFM)
0.5m/s (100LFM)
NC 75 85
75
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
Vo=3.3V
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
Ripple and Noise Waveforms
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
OUTPUT VOLTAGE VO (V) (10mV/div)
TIME, t (1s/div)
OUTPUT VOLTAGE VO (V) (20mV/div)
TIME, t (1s/div)
Vo=0.69V, Io = Io,max
Vo=1.2V, Io = Io,max
OUTPUT VOLTAGE VO (V) (20mV/div)
TIME, t (1s/div)
OUTPUT VOLTAGE VO (V) (20mV/div)
TIME, t (1s/div)
Vo=1.8V, Io = Io,max
Vo=2.5V, Io = Io,max
OUTPUT VOLTAGE VO (V) (20mV/div)
TIME, t (1s/div)
OUTPUT VOLTAGE VO (V) (20mV/div)
TIME, t (1s/div)
Vo=3.3V, Io = Io,max
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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Transient Response Waveforms
OUTPUT VOLTAGE VO (V) (200mV/div)
OUTPUT CURRENT, IO (A) (5Adiv)
TIME, t (20s /div)
OUTPUT CURRENT, IO (A) (5Adiv)
OUTPUT VOLTAGE VO (V) (200mV/div)
TIME, t (20s /div)
Transient Response to Dynamic Load Change from 0% to 50% to 0%. Vo=0.69V
OUTPUT VOLTAGE VO (V) (200mV/div)
Transient Response to Dynamic Load Change from 0% to 50% to 0%. Vo=1.2V
OUTPUT VOLTAGE VO (V) (200mV/div)
OUTPUT CURRENT, IO (A) (5Adiv)
TIME, t (20s /div)
OUTPUT CURRENT, IO (A) (5Adiv)
TIME, t (20s /div)
Transient Response to Dynamic Load Change from 0% to 50% to 0%. Vo=1.8V
OUTPUT VOLTAGE VO (V) (200mV/div)
Transient Response to Dynamic Load Change from 0% to 50% to 0%. Vo=2.5V
OUTPUT VOLTAGE VO (V) (200mV/div)
OUTPUT CURRENT, IO (A) (5Adiv)
TIME, t (20s /div)
OUTPUT CURRENT, IO (A) (5Adiv)
TIME, t (20s /div)
Transient Response to Dynamic Load Change from 0% to 50% to 0%. Vo=3.3V
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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Startup Time
ON/OFF VOLTAGE OUTPUT VOLTAGE VO (V) (200mV/div) VON/OFF (V) (5V/div)
TIME, t (2 ms/div)
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=0.69V
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.2V
ON/OFF VOLTAGE OUTPUT VOLTAGE VON/OFF (V) (5V/div) VO (V) (500mV/div)
TIME, t (1 ms/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE VO (V) (1V/div) VON/OFF (V) (5V/div)
TIME, t (1 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=1.8V
Start-up Using On/Off Voltage (Io = Io,max), Vo=2.5V
TIME, t (1 ms/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE VO (V) (2V/div) VON/OFF (V) (5V/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE VO (V) (1V/div) VON/OFF (V) (2V/div)
TIME, t (1 ms/div)
Start-up Using On/Off Voltage (Io = Io,max), Vo=3.3V
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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Startup Time (continued)
OUTPUT VOLTAGE VO (V) (200mV/div)
INPUT VOLTAGE VIN (V) (5V/div)
TIME, t (2ms/div)
INPUT VOLTAGE VIN (V) (5V/div)
OUTPUT VOLTAGE VO (V) (500mV/div)
TIME, t (2ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max), Vo=0.69V
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=1.2V
OUTPUT VOLTAGE VO (V) (500mV/div)
INPUT VOLTAGE VIN (V) (5V/div)
TIME, t (2ms/div)
INPUT VOLTAGE VIN (V) (5V/div)
OUTPUT VOLTAGE VO (V) (1V/div)
TIME, t (2ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=1.8V
Start-up Using Input Voltage (VIN = 12V, Io = Io,max), Vo=2.5V
OUTPUT VOLTAGE VO (V) (1V/div)
INPUT VOLTAGE VIN (V) (5V/div)
TIME, t (2ms/div)
INPUT VOLTAGE VIN (V) (5V/div)
OUTPUT VOLTAGE VO (V) (2V/div)
TIME, t (2ms/div)
Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=3.3V
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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
CURRENT PROBE
Test Configurations
Input Reflected Ripple Current Test Setup.
TO OSCILLOSCOPE LTEST 1H VIN(+)
BATTERY
CS 1000F Electrolytic E.S.R.<0.1 @ 20C 100kHz
CIN 2x100F Tantalum COM
NOTE: Measure input reflected ripple current with a simulated source inductance (LTEST) of 1H. Capacitor CS offsets possible battery impedance. Measure current as shown above.
Output Ripple and Noise Test Setup
COPPER STRIP RESISTIVE LOAD 0.1uF 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. 10uF
Vo+
Output Voltage and Efficiency Test Setup
Rdistribution
Rcontact VIN(+) VO
Rcontact
Rdistribution
VIN
VO
RLOAD
Rdistribution
Rcontact COM COM
Rcontact
Rdistribution
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 = 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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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 F or 3x22 F ceramic capacitors and an input of 12V.
300 250 200 150 100 50 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 2x22uF 3x22 uF
Note: Input ripple voltage for various output voltages with 2x22 F or 3x22 F 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 F ceramic and 10 F 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.
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
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 Filtering (continued)
40
30 Ripple (mVp-p)
1x10uF External Cap 1x47uF External Cap 2x47uF External Cap 4x47uF External Cap
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 F, 1x47 F, 2x47 F or 4x47 F 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
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.
Min 0 2.0 Vin-1 Typ Max 1 Vin,max 3.5 Vin,max Unit V V V V Notes The remote on/off pin open, Unit off. The remote on/off pin open, Unit on.
Remote On/Off
Parameter Signal Low (Unit On) Signal High (Unit Off) Signal Low (Unit Off) Signal High (Unit On) Active Low Active High
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 24.9k 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 20k.
VIN+
MODULE
Rpullup I ON/OFF ON/OFF + VON/OFF Q1 GND _ 23K 24.9K
22K Q2 Q3
PWM Enable
22K 22K
12.1K
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
I ON/OFF ON/OFF + VON/OFF Q1 GND _ 23K 22K Q2
PWM Enable
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 October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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 135C 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 14
Input Voltage (v)
12 10 8 6 4 2 0 0.5 1 1.5 2
Upper Limit
Lower Limit
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.
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
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 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 = k (Vo - 0.69)
Rtrim is the external resistor in k 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 (K) 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 TRIM R tri m GND LOAD
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
16
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.
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.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
17
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Output Voltage Sequencing (continued)
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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.
VIN+
MODULE
499K + R1 SEQ 10K OUT
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
Power Good
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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 100K) 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
CTUNE
CO
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.
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
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.
Tunable LoopTM (continued)
Table 2.General recommended values of RTUNE and CTUNE for Vin=12V and various external ceramic capacitor combinations.
Co RTUNE CTUNE 1x47F 240 1500pF 2x47F 240 2700pF 4x47F 240 5600pF 10x47F 20x47F 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 V 3.3V 5x47F + 330F 6x47F Polymer 220 220 5600pF 7500pF 99mV 66mV 5V 2.5V 2x330F Polymer 200 18nF 50mV 1.8V 1.2V 6x47F + 2x 330F 6x47F + 4x330F Polymer Polymer 150 150 33nF 120nF 36mV 24mV 0.69V 12x330F 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.
Wind Tunnel PWBs 25.4_ (1.0)
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
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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: Vout: 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+
VIN
VOUT S+
RTUNE
Vout+
+
CI2
CI1 Q1
MODULE
CTUNE
CO1
+
CO2
ON/OFF GND
TRIM SRTrim
CI1 CI2 CO1 CO2 CTune RTune RTrim
2 x 22F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20) 200F/16V bulk electrolytic 5 x 47F/6.3V ceramic capacitor (e.g. Murata GRM31CR60J476ME19) 2 x 330F/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) 6.19k 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
21
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.
Mechanical Outline
Top View
Side View
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
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Mechanical Outline (continued)
Recommended Pad Layout
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
PIN 1 2 3 4 5 6 7 8 9 10
FUNCTION ON/OFF VIN SEQ GND VOUT TRIM S+ SPGOOD 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 C 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
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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")
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
24
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Surface Mount Information
October 8, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
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 30C 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 260C 250 Cooling Zone
Reflow Temp (C)
200 * Min. Time Above 235C 15 Seconds 150 Heating Zone 1C/Second 100 *Time Above 217C 60 Seconds
50
0
Reflow Time (Seconds)
Recommended linear reflow profile using Sn/Ag/Cu solder.
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
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.
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
2009-6-10 2009-6-25 2009-9-1 2009-10-8
Revision
A B C D First release
Changes Detail
Section "Surface Mount Information" added. Tunable Loop
TM
Approval
T. Bubriski T. Bubriski T. Bubriski T. Bubriski
logo added.
Updated Startup Time waveforms on page 10.
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products.
(c)2009 Bel Fuse Inc. Specifications subject to change without notice.10/08/09
26
CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com FAR EAST 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 EUROPE 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

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