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September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter
FEATURES
Industry standard Full- Brick Package Up to 600 Watts of output power Regulated Output, Fixed Switching Frequency Up to 92 % Efficiency Fully Isolated to 1500 Volts Over Current Protection Inverter Operation Monitor function (I.O.G) Input Under/Over Voltage Lockout Protection Extended temperature range of - 40°C to +100°C Isolated On/Off logic control Continuous Short Circuit Protection Safety meets EN55022 Class A specifications PRODUCT OVERVIEW The FB series offers up to 6 00 watts of output power in standard Full- Brick package. This series features high efficiency up to 92%, high power density and 1500 Volts of DC isolation. These converters are reliable, and compact with a single output voltage. The FB series can deliver up to 50A of output current and provide a precise regulated output voltage over a wide input range of 1 8-36 or 36- 75 volts. These modules operate over a wid e case temperature range of – 40°C to +100°C. This series offers direct cooling of dissipative components for excellent thermal performance. The main features of these converters include remote On/Off (positive or negative), remote sense, output voltage adjustment, over voltage, over current and over temperature protection. APPLICATIONS: Distributed Power Architectures Telecommunication Data and Wireless communications Servers Military and industrial applications AVAILABLE OPTIONS Customizable Input/ Output voltages Heatsink, customizable packaging Contact DATEL for other series of Full Brick footprint , Cost Saving, Lower Power , different output voltage, etc. MODEL NUMBER INPUT VOLTAGE OUTPUT VOLTAGE OUTPUT CURRENT MAX EFFICIENCY % LOAD REGULATION OPTIONS FB24S12-50 18-36 VDC 12 VDC 50A 88 ±0.5 P, H FB24S24-25 18-36 VDC 24 VDC 25 A 90 ±0.5 P, H FB24S28-21.5 18-36 VDC 28 VDC 21.5 A 90 ±0.5 P, H FB24S32-19 18-36 VDC 32 VDC 19 A 91 ±0.5 P, H FB24S48-12.5 18-36 VDC 48 VDC 12.5 A 91 ±0.5 P, H FB48S12-50 36-75VDC 12 VDC 50 A 90 ±0.5 P, H FB48S24-25 36-75VDC 24 VDC 25 A 92 ±0.5 P, H FB48S28-21.5 36-75VDC 28 VDC 21.5 A 91 ±0.5 P, H FB48S32-19 36-75VDC 32 VDC 19 A 92 ±0.5 P, H FB48S48-12.5 36-75VDC 48 VDC 12.5 A 92 ±0.5 P, H Block Diagram Page 1 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter ABSOLUTE MAXIMUM RATINGS PARAMETER CONDITIONS MODEL Min. Typical Max. Units Input Voltage Continuous DC 24Vin -0.3 36 Volts 48Vin -0.3 75 Operating case Temperature All -40 +100 ℃ Storage Temperature All -55 +105 ℃ Input / Output Isolation Voltage 1 minute All 1500 Volts Note: Stresses above the absolute maximum ratings can cause permanent damage to the device. Exposure to absolute maximum ratings for extended periods can affect the device reliability. INPUT CHARACTERISTICS Note: All specifications are typical at nominal input, full load at 25 ℃ unless otherwise noted PARAMETER CONDITIONS MODEL Min. Typical Max. Units Operating Input Voltage 24Vin 18 24 36 Volts 48Vin 36 48 75 Input Under Voltage Lockout Turn-On Voltage Threshold 24Vin 16 17 18 Volts 48Vin 34 35 36 Turn-Off Voltage Threshold 24Vin 15 16 17 Volts 48Vin 32 33 34 Lockout Hysteresis Voltage 24Vin 1 Volts 48Vin 2 Maximum Input Current 100% Load, V in= 18V for FB24SXX 24Vin 37.7 A 100% Load, V in =36V for FB48SXX 48Vin 21.7 No-Load Input Current Vin =Nominal input FB24S12-50 150 mA FB24S24-25 150 FB24S28-21.5 150 FB24S32-19 150 FB24S48-12.5 200 FB48S12-50 90 FB48S24-25 100 FB48S28-25 105 FB48S32-19 90 FB48S48-12.5 130 Inrush Current (I 2t) As per ETS300 132- 2 All 0.1 A2s Page 2 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter OUTPUT CHARACTERISTIC PARAMETER CONDITIONS MODEL Min. Typical Max. Units Output Voltage Set Point Vin =Nominal Vin , Io = Io_max, Tc=25℃ Vo=12V 11.82 12.00 12.18 Volts Vo=24V 23.64 24.00 24.36 Vo=28V 27.58 28.00 28.42 Vo=32V 31.52 32.00 32.48 Vo=48V 47.28 48.00 48.72 Output Voltage Regulation Load Regulation Io= Io_min to Io_max All ±0.5 % Line Regulation Vin=low line to high line All ±0.2 % Temperature Coefficient TC=-40°C to 100°C All ±0.03 %/°C Output Voltage Ripple and Noise Peak-to-Peak 20MHz bandwidth, Full load, 10 µF tantalum and 1.0µF ceramic capacitors Vo=12V Vo=24V Vo=28V Vo=32V Vo=48V 120 240 280 320 480 mV RMS 5Hz to 20MHz bandwidth , Full load, 10uF solid tantalum and 1.0uF ceramic capacitors Vo=12V Vo=24V Vo=28V Vo=32V Vo=48V 100 100 120 200 mV Operating Output Current Range FB24S28-21.5 FB48S28-25 Vo=12V Vo=24V Vo=32V Vo=48V 21.5 12.5 A Output DC Current Limit Inception Output Voltage=90% Nominal Output Voltage All 110 125 150 % Power Good Signal(IOG) Vout ready: low level, sink current All 20 mA Power Good Signal(IOG) Vout not ready: open drain output, applied voltage All 50 V Output Capacitance Full load (resistive) 12V 470 10000 µF Output Capacitance Full load (resistive) 24,28,32,48V 470 5000 µF DYNAMIC CHARACTERISTICS PARAMETER CONDITIONS MODEL Min. Typical Max. Units Output Voltage Current Transient Step Change in Output Current di/dt=0.1A/us, Load change from 75% to 100% to 75% of Io,max All ±3 ±5 % Setting Time (within 1% Vout nominal) di/dt=0.1A/us All 500 µs Turn-On Delay and Rise Time Turn-On Delay Time, From On/Off Control Von/off to 10%Vo_set All 75 ms Turn-On Delay Time, From Input Vin_min to 10%Vo_set All 250 ms Output Voltage Rise Time 10%Vo_set to 90%Vo_set All 50 ms Page 3 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter FEATURE CHARACTERISTICS PARAMETER CONDITIONS Device Min. Typical Max. Units 100% Load Efficiency Vin =24 Vdc, Io = Io_max, Tc=25℃ FB24S12-50 88 FB24S24-25 90 FB24S28-21.5 90 FB24S32-19 91 FB24D48-12.5 91 Vin =48 Vdc, Io = Io_max, Tc=25℃ FB48S12-50 89 FB48S24-25 91 FB48S28-25 92.5 FB48S32-19 91.5 FB48D48-12.5 92 ISOLATION CHARACTERISTICS Isolation Voltage 1 minute; input/output, input/case, output/case input/remote, output/remote
1500 Volts
Isolation Resistance 10 MΩ Isolation Capacitance 4000 pF Switching Frequency Vo=12,28,32V 300 KHz Vo=24,48V 250 ON/OFF Control Negative Remote On/Off logic Logic Low (Module Off) 0 0.01 mA Logic High (Module On) 1.0 10 mA ON/OFF Control Positive Remote On/Off logic Logic High (Module Off) 1.0 10 mA Logic High (Module On) 0 0.01 mA Auxiliary Output Voltage All 7 10 13 V Auxiliary Output Current All 20 mA Load Share Accuracy (50% -100% load) -10 +10 % Off Converter Input Current Shutdown input idle current 50 mA Output Voltage Trim Range Pout=max rated power 60 110 % Output Over Voltage Protection 115 125 140 % Over-Temperature Shutdown 110 °C Over-Temperature Shutdown All 110 °C MTBF Io=100% of I o_max: Ta=25°C per MIL -HDBK- 217F 450 K hours Weight 220 grams Page 4 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Operating Temperature Range The FB series converters can operate within a wide case temperature range of - 40°C to +100°C. Consideration must be given to the de- rating curves when ascertaining maximum power that can be drawn from the converter. The maximum power drawn from the full brick models is influenced by many factors, such as:
- Input voltage range
- Output load current
- Forced air or natural convection Output Voltage Adjustment The output voltage on all models is adjustable within the range of 60% to 110%. Over Current Protection The converter is protected against over current or short circuit conditions. At the instance of current -limit inception, the module enters a constant current mode of operation. While the fault condition exists, the module will remain in this constant current mode, and can remain in this mode until the fault is cleared. The unit operates normally on ce the output current is reduced back in to its specified range. Output over Voltage Protection The converter is protected against output over voltage conditions. When the output voltage is higher than the specified range, the module enters a hiccup mode of operation . Remote On/Off The Remote On/Off input pins permit the user to turn the power module on or off via a system signal from the primary side or the secondary side. Two Remote On/Off options are available. Negative logic turns the module on as long as a current (1 -10mA) is flowing between +on/off and –on/off and inactive when no current is flowing. Positive logic turns the module o ff as long as a current (1 - 10mA) is flowing between +on/off and –on/off and active when no current is flowing . Under/Over Voltage Lock Out (UVLO &OVLO) Input under /over voltage lockout is standard on this series of converters. At input voltages below /beyond the input under voltage lockout limit, the module operation is disabled. Over Temperature Protection These modules have an over temperature protection circu it to safeguard against thermal damage. When t he case temperature rises above over temperature shutdown threshold , the converter will shut down to protect it from overheating. The module will automatically restart after it cools down. Recommended Layout, PCB Footprint and Soldering Information The user must ensure that other components and metal in the vicinity of the converter meet the spacing requirements to which the system is approved. Low resistance and low inductance PCB layout should be used where possible. Proper attention must also be g iven to low impedance tracks between power module, input and output grounds. The recommended footprints and soldering profiles are shown in the next two figures. Note： 1. Soldering Materials: Sn/Cu/Ni 2. Ramp up rate during preheat : 1.4 ℃/Sec (From 50℃ to 100℃ ) 3. Soaking temperature: 0.5 ℃ /Sec (From 100℃ to 130℃ ), 60±20 seconds 4. Peak temperature: 260℃ , above 250℃ 3~6 Seconds 5. Ramp up rate during cooling :-10.0 ℃/Sec (From 260℃ to 150℃) TOP VIEW 3.5mm NON THROUGH HOLE 2.4mm PLATED THROUGH HOLE 4.8mm PAD SIZE 1.4mm PLATED THROUGH HOLE 2.8mm PAD SIZE Recommend PCB Pad layout Convection Requirements for Cooling To predict the approximate cooling needed for the full brick module, refer to the power de- rating curves. These de -rating curves are approximations of the ambient temperatures and airflows required to keep the power modu le temperature below its maximum rating. Once the module is assembled in the actual system, the module’s temperature should be monitored to ensure it does not exceed 100°C as being measured at the center of the top of the case (thus verifying proper coolin g). Thermal Considerations The power module operates in a variety of thermal environments; however, sufficient cooling should be provided to help ensure reliable operation of the unit. Heat is removed by conduction, convection, and radiation to the surroun ding environment. The power output of the module should not be allowed to exceed rated power (V o_set x Io_max). Lead Free Wave Soldering Profile 100 150 200 250 300 0 50 100 150 Time (Seconds) Temperature (°C) Page 5 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Power De-rating The operating case temperature range of the FB series is - 40℃ to +100℃. When operating the FB series, proper de- rating or cooling is needed. The maximum case temperature under any operating condition should not be exceeded + 100℃ . The following curve is the de- rating curve of FB series without heat sink: Example: What is the minimum airflow necessary for a FB 48S12-50 operating at nominal line, delivering an output current of 30A and a maximum ambient temperature of + 40℃ Solution: Given: Vin=48Vdc, Vo=12Vdc, Io=30A Determine Power dissipation (P d): Pd =Pi-Po=Po(1-η)/η Determine airflow: Given: Pd =40W and Ta=40℃ Check above Power de- rating curve: minimum airflow= 700 ft./min. Verifying: The maximum temperature rise The maximum case temperature Tc=Ta+ △T=94℃ <100℃ Where: The Rca is thermal resistance from case to ambience. The Ta is ambient temperature and the Tc is case temperature. Chart of Thermal Resistance v s Air Flow 0 10 20 30 40 50 60 70 80 90 100 Power Disspated ,Pd(Watts) Ambient Temperature ,Ta(Deg. C) Power Dissipated vs Ambient Temperature and Air Flow Natural Convection 20 ft./min. (0.1 m/s) 100 ft./min. (0.5 m/s) 200 ft./min. (1.0 m/s) 300 ft./min. (1.5 m/s) 400 ft./min. (2.0 m/s) 500 ft./min. (2.5 m/s) 600 ft./min. (3.0 m/s) 700 ft./min. (3.5 m/s) 800 ft./min. (4.0 m/s) AIR FLOW RATE TYPICAL Rca Natural Convection 20ft./min. (0.1m/s) 3.82 ℃/W 100 ft./min. (0.5m/s) 3.23 ℃/W 200 ft./min. (1.0m/s) 2.71 ℃/W 300 ft./min. (1.5m/s) 2.28 ℃/W 400 ft./min. (2.0m/s) 1.92 ℃/W 500 ft./min. (2.5m/s) 1.68 ℃/W 600 ft./min. (3.0m /s) 1.50 ℃/W 700 ft./min. (3.5m/s) 1.35 ℃/W 800 ft./min. (4.0m/s) 1.23 ℃/W Page 6 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter The following curve is the de- rating curve of FB series with heat sink M -B012: Forced Convection Power De- rating with Heat Sink M -B012 Example: What is the minimum airflow necessary for a FB 48S12-50 operating at nominal line, an output current of 50 A, and a maximum ambient temperature of 40 ℃ Solution: Given: Vin=48Vdc, Vo=12Vdc, Io=50A Determine Power dissipation (P d): Pd=Pi-Po=Po(1-η)/η Pd=12x50x(1-0.9)/0.9=66.7Watts (Chart of Thermal Resistance vs Air Flow ) Determine airflow: Given: Pd=66.7W and T a=40℃ Check above Power de- rating curve: minimum airflow = 400 ft./min. Verifying: The maximum temperature rise △T = Pd × Rca=66.7×0.83=55.4℃ The maximum case temperature T c=Ta+ △T=95.4℃ <100℃ Where: The Rca is thermal resistance from case to ambien ce. The Ta is ambient temperature and the Tc is case temperature. 0 10 20 30 40 50 60 70 80 90 100 Power Disspated ,Pd(Watts) Ambient Temperature ,Ta(Deg. C) Power Dissipated vs Ambient Temperature with heat sink M-B012 Natural Convection 20 ft./min. (0.1 m/s) 100 ft./min. (0.5 m/s) 200 ft./min. (1.0 m/s) 300 ft./min. (1.5 m/s) 400 ft./min. (2.0 m/s) AIR FLOW RATE TYPICAL Rca Natural Convection 20ft./min. (0.1m/s) 2.4 ℃/W 100 ft./min. (0.5m/s) 1.76 ℃/W 200 ft./min. (1.0m/s) 1.17 ℃/W 300 ft./min. (1.5m/s) 1.00 ℃/W 400 ft./min. (2.0m/s) 0.83 ℃/W Page 7 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Full Brick Heat Sinks: Heat-sink M-B012 All Dimension In mm Longitudinal Fins Heat Sink (Clear Mounting Inserts Φ3.3mm Through): 116.8*61*25.4(M -B012) (G6620090204) Thermal PAD: SR60*115.8*0.23 (G6135013070) Screw: M3*20L (G75A1300052) Nut: NH+WOM3*P0.5N(G75A2440392) Heat-sink M-C997 All Dimension In mm Longitudinal Fins 116.8¡ Ó 0.3 106.7¡ Ó 0.2 5.055.1 50.8¡ Ó 0.2 61.0¡ Ó 0.5 2.1 1.4 4-M3*0.5 25.4 5.4 2.7 2-R0.9 6-R1.05 4-R0.2 10-R0.4 2-R0.84.2 0.5 9 0 ¢X 0.3 C0.3C0.3 Heat Sink (Mounting Inserts M3*0.5 Through): 116.8*61*25.4(M -C997) (G6620980201) Thermal PAD: SR60*115.8*0.23 (G6135013070) Screw: M3*20L (G75A1300052) Washer: WS3.2N (G75A47A0752) AIR FLOW RATE TYPICAL Rca Natural Convection 20ft./min. (0.1m/s) 2.4 ℃/W 100 ft./min. (0.5m/s) 1.76 ℃/W 200 ft./min. (1.0m/s) 1.17 ℃/W 300 ft./min. (1.5m/s) 1.00 ℃/W 400 ft./min. (2.0m/s) 0.83 ℃/W Full Brick Heat Sink Assembly Page 8 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Screw Thermal Pad Heatsink Screw nut Heat Sink: M -B012 Thermal PAD: SR60*115.8*0.23 (G6135013070) Screw: M3*20L (G75A1300052) Nut: NH+WOM3*P0.5N(G75A2440392) Screw Washer Thermal Pad Heatsink Heat Sink: M -C997 Thermal PAD: SR60*115.8*0.23 (G6135013070) Screw: M3*20L (G75A1300052) Washer: WS3.2N (G75A47A0752 ) Page 9 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter EFFICIENCY vs. LOAD FB24S12-50 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 18Vin 24Vin 36Vin FB48S12-50 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 36Vin 48Vin 75Vin FB4S24-25 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 18Vin 24Vin 36Vin FB48S24-25 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 36Vin 48Vin 75Vin FB24S28-21.5 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 18Vin 24Vin 36Vin FB48S28-25 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 36Vin 48Vin 75Vin FB-24S32-19 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 18Vin 24Vin 36Vin FB48S32-19 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 36Vin 48Vin 75Vin Page 10 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter FB24S48-12.5 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 18Vin 24Vin 36Vin FB48S48-12.5 Efficiency vs. Load 60% 65% 70% 75% 80% 85% 90% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Efficiency 36Vin 48Vin 75Vin Page 11 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Test Set-Up The basic test set -up to measure efficiency , load regulation , line regulation and other parameters is shown in the next figure . When testing the converter under any transient conditions , the user should ensure that the transient response of the source is sufficient to p ower the equipment under test. Below is the calculation of: 1- Efficiency 2- Load regulation 3- Line regulation The value of efficiency is defined as: %100×× ×= IinVin IoVoη Where: Vo is output voltage, Io is output current, Vin is input voltage, Iin is input current. The value of load regulation is defined as: %100. ×−= NL NLFL V VVregLoad Where: VFL is the output voltage at full load VNL is the output voltage at no load The value of line regulation is defined as: Where: VHL is the output voltage of maximum input voltage at full load. VLL is the output voltage of minimum input voltage at full load. DC A CFB600 Series V +Vin -Vin +ON/OFF -ON/OFFC1 R1 +SNS +Vout -Vout TRIM -SNS A Load FB Series Test Setup Recommend C1and C2 Value C1:220uF/100V, C2:470uF/100V For FB series it’s necessary to connect the input electrolytic capacitor C1 with low ESR to prevent the effective of input line inductance to the DC/DC converter. For stable operation , connect a low impedance electrolytic capacitor C2 in the output terminals. When operated at lower temperature than - 20℃, increasing the C2 capacitance with three or four times more than the recommended value. Output Voltage Adjustment The Trim input permits the user to adjust the output voltage up or down according to the trim range specification (60% to 110% of nominal output). This is accomplished by connecting an external resistor between the +Vout and +Sense pin for trim up and between the TRIM and –Sense pin for trim down , see figure below: DC CFB600 Series +Vin -Vin +ON/OFF -ON/OFFC1 +SNS +Vout -Vout TRIM -SNS Load VR Rt Output voltage trim circuit configuration The Trim pin should be left open if trimming is not being used. The output voltage can be determined by the following equations: VfVRVoVout Rt Rt Rt Rt Vf ×+= 68.7 (24.1 Unit: KΩ Vo: Nominal Output Voltage Recommend Rt=6.8K Ω The output voltage can also be adjustment by using external DC voltage Output Voltage = TRIM Terminal Voltage * Nominal Output Voltage %100. ×−= LL LLHL V VVregLine FB Series FB Series Page 12 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Output Remote Sensing The FB series of converters has the capability to remotely sense both lines of its output. This feature moves the effective output voltage regulation point from the output of the unit to the point of connection of the remote sense pins. This feature automatically adjusts the real ou tput voltage of the FB series in order to compensate for voltage drops in distribution and maintain a regulated voltage at the point of load. The remote- sense voltage range is: [(+Vout) - (-Vout)] – [(+Sense) – (-Sense)] ≦ 10% of Vo_nominal If the remote s ense feature is not to be used, the sense pins should be connected locally. The +Sense pin should be connected to the +Vout pin at the module and the - Sense pin should be connected to the -Vout pin at the module. This is shown in the schematic below. DC CFB600 Series +Vin -Vin +ON/OFF -ON/OFFC1 +SNS +Vout -Vout TRIM -SNS C2 Load Note: Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sen se or the trim. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased and consequently increase th e power output of the module if output current remains unchanged . Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = V o,set x Io,max) Output Ripple and Noise DC CFB600 Series +Vin -Vin +ON/OFF -ON/OFFC1 +SNS +Vout -Vout TRIM -SNS Load 1uF 10uF BNC to scope Output ripple and noise is measured with 1.0uF ceramic and 10uF solid tantalum capacitors across the output.
6.11 Output Capacitance
The FB series converters provide unconditional stability with or without external capacitors. For good transient response, low ESR output capacitors should be located close to the point of load. PCB design emphasizes low resistance and inductance tracks in consideration of high current applications. Output capacitors with their associated ESR values have an impact on loop stability and bandwidth. The minimum output capacitance is 470 µF which need three or four times capacitance when operating below -20℃ and the absolute maximum value of FB series’ output capacitance is 10000 µF. For values larger than this, please contact your local DATEL ’s representative. Parallel Operation The FB series are also designed for parallel operation. When paralleled, the load current can be equally shared between the modules by connecting the PC pins together. There are two different parallel operation s for FB series, one is parallel operation when load can’t be supplied by only one power unit; the other is the N+1 redundant operation which is high reliable for load of N units by using N+1 units. (a) parallel operation PC PC L O A D (b) Parallel operation with programmed and adjustable output PC PC L O A D TRIM TRIM (c) N+1 redundant connection PC PC L O A D (d) N+1 redundant connection with programmed output and adjustable output voltage FB Series FB Series Page 13 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter PC PC L O A D TRIM TRIM IOG signal Normal and abnormal operation of the converter can be monitored by using the I.O. G signal. Output of this signal monitor is located at the secondary side and is an open collector , you can use the signal by the internal aux power supply or the external DC supply as the following figures. T he ground reference is the –Sense Pin. By internal AUX By external DC supply This signal is LOW when the converter is normally operating and HIGH when the converter is disabled or when the converter is abnormally operating. Auxiliary Power for output signal The auxiliary power supply output is within 7 -13V with maximum current of 20 mA. Ground reference is the –sense Pin. On/Off Control The converter On/Off function can be controlled from the input side or the output side. Output voltage turns on when current is made to through On/Off terminals which can be reached by opening or closing the switches. T he maximum current through the O n/Off pin is 10mA, setting the resistor value to avoid the maximum current through the On/Off pins. (A) Controlling the O n/Off terminal from the input side, recommend R1 value is 30 K (0.5W) for 48Vin and 15K (0.25W) for 24Vin. +Vi -Vi -ON/OFF +ON/OFFSW Input I(ON/OFF) (B) Controlling the ON/OFF terminal from the output side, Recommend R2 value is 5.1k (0.1W). AUX -ON/OFF +ON/OFFSW Output I(ON/OFF) Page 14 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter SAFETY and EMC Input Fusing and Safety Considerations The FB series converters have no internal fuse. In order to achieve maximum safety and system protection, always use an input line f use. We recommended a 60A time delay fuse for 24 Vin models, and 30A for 48Vin models. It is recommended that the circuit have a transient voltage suppressor diode (TVS) across the input terminal to protect the unit against surge or spike voltage and input revers e voltage (as shown). EMC Considerations Suggested Circuits for Condu cted EMI CLASS A (1) EMI and conducted noise meet EN55022 Class A specifications: Model No. C1 C2 C3 CY1/CY2 CY3/CY4 C4 L1 L2 R1 FB24S12-50 1000µF/50V 2.2µF/100V 1000uF/50V 0.1µF NC 470µF/100V+10µF/50V Short 1mH 15K FB24S24-25 1000µF/50V 2.2µF/100V 1000µF/50V 0.1µF NC 470µF/100V+10µF/50V Short 1mH 15K FB24S28-21.5 1000µF/50V 2.2µF/100V 1000µF/50V 0.1µF NC 470µF/100V+10µF/50V Short 1mH 15K FB24S32-19 1000µF/50V 2.2µF/100V 1000µF/50V 0.1µF NC 470µF/100V+10µF/50V Short 1mH 15K FB24S48-12.5 1000µF/50V 2.2µF/100V 1000µF/50V 0.1µF NC 470µF/100V+10µF/50V Short 1mH 15K FB48S12-50 NC 470µF/100V 470µF/100V 10000pF 10000pF*2 470µF/100V Short 2mH 30K FB48S24-25 NC 470µF/100V 470µF/100V 10000pF 10000pF*2 470µF/100V Short 2mH 30K FB48S28-25 NC 470µF/100V 470µF/100V 10000pF 10000pF*2 470µF/100V Short 2mH 30K FB48S32-19 NC 470µF/100V 470µF/100V 10000pF 10000pF*2 470µF/100V Short 2mH 30K FB48S48-12.5 NC 470µF/100V 470µF/100V 10000pF 10000pF*2 470µF/100V Short 2mH 30K Note: 1000µF/50V is NIPPON CHEMI -CON KY series aluminum capacitors, 470 µF/100V is Nichicon PS(M) series aluminum capacitors,CY1, CY2, CY3 & CY4 is Y1 capacitors, other capacitors is ceramic capacitors 2220 size. Inductor core material is VAC W523, 1mH is 1.2 mm*2 6T, 2mH is 1.5mm*1 8T . I Page 15 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter Class A test conducted for FB24S12-50 Class A test conducted for FB24S24-25 Class A test conducted for FB24S28-21.5 Class A test conducted for FB24S32-19 Class A test conducted for FB24S48-12.5 Class A test conducted for FB48S12-50 Class A test conducted for FB48S24-25 Class A test conducted for FB48S28-25 Class A test conducted for FB48S32-19 Class A test conducted for FB48S48-12.5 Page 16 of 17
September 16, 2017 B.03 FB SERIES Full-Brick Up to 600 Watt DC-DC Converter MECHANICAL SPECIFICATIONS PIN CONNECTIONS PIN CONNECTION PIN SINGLE PIN SINGLE 1 + V Input 11 + Sense 2 + V Input 12 - Sense 3 -ON/OFF 13 Trim 4 +ON/OFF 14 PC/NC 5, 6, 7 + V Output 15 I.O.G 8, 9, 10 - V Output 16 Auxiliary PART NUMBER ORDERING INFORMATION FB Nominal Input Voltage Number of Outputs S 12 6 N, P, H (18-36) 24 Volts (36-75) 48 Volts S- Single None - Negative On/Off control P - Positive On/Off control H - Heatsink Note: For proper part ordering, enter option suffixes in the order listed in the table above Voltage Output Current Output (A) Options Family, Form Factor Package
12 Volts
28 Volts
32 Volts
48 Volts
12 Volts - 50A
24 Volts - 25A
28 Volts – 21.5A 32Volts – 19A 48 Volts – 12.5A Page 17 of 17