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 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 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. 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 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 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 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 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 16 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 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 17 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 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 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 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 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). 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 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 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%) 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 2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /20 A Output 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 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 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 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”) 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 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 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