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FEATURES
High efficiency: 96.5% @ 9.6V/25A Size: 58.4mm x 22.8mm x 11.3mm (2.28" x 0.90" x 0.44") Industry standard pinout Fully protected: Input UVLO, OVP, Output OCP and OTP 240W constant power output Parallelable for higher output power 2250V isolation Basic insulation Monotonic startup No minimum load required ISO 9001, TL 9000, ISO 14001, QS9000, OHSAS18001 certified manufacturing facility UL/cUL 60950 (US & Canada) Recognized, and TUV (EN60950) Certified CE mark meets 73/23/EEC and 93/68/EEC directives
Delphi Series E48SB, 240W Eighth Brick Bus Converter DC/DC Power Modules: 48Vin, 9.6V/25A out
OPTIONS
Delta Electronics, Inc., a world leader in power systems technology and manufacturing, has introduced the E48SB, eighth brick sized 240W bus converter, into their Delphi Series of board mounted DC/DC power converters to support the intermediate bus architecture to power multiple downstream non-isolated point-of-load (POL) converters. The E48SB product family features an input voltage of 38V to 55V, and provides up to 240W (9.6V and above) of power in an industry standard eighth brick footprint. Typical efficiency of 9.6V module is 96.5%. With optimized component placement, creative design topology, and numerous patented technologies, the E48SB bus converters deliver outstanding electrical and thermal performance. An optional heatsink is available for harsh thermal requirements.
Positive On/Off logic Short pin lengths Heatsink available for extended operation OTP and OCP mode (Auto re-restart or latch)
APPLICATIONS
Datacom / Netowrking Wireless Networks Optical Network Equipment Server and Data Storage Industrial/Testing Equipment
DATASHEET DS_E48SB9R625_01232007
TECHNICAL SPECIFICATIONS
(TA=25C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous Operating Temperature Storage Temperature Input/Output Isolation Voltage INPUT CHARACTERISTICS Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Input Over-Voltage Lockout Turn-Off Voltage Threshold Turn-On Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current No-Load Input Current Off Converter Input Current Inrush Current (I2t) Input Reflected-Ripple Current OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Load Over Line Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Power Range Output DC Powert-Limit Inception Current share accuracy (2 units in parallel) DYNAMIC CHARACTERISTICS Output Voltage Current Transient Positive Step Change in Output Current Negative Step Change in Output Current Settling Time (within 1% Vout nominal) Turn-On Transient Start-Up Time, From On/Off Control Start-Up Time, From Input Maximum Output Capacitance EFFICIENCY 100% Load 60% Load ISOLATION CHARACTERISTICS Input to Output Isolation Resistance Isolation Capacitance FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control, Negative Remote On/Off logic Logic Low (Module On) Logic High (Module Off) ON/OFF Control, Positive Remote On/Off logic Logic Low (Module Off) Logic High (Module On) ON/OFF Current (for both remote on/off logic) Leakage Current (for both remote on/off logic) GENERAL SPECIFICATIONS MTBF Weight Over-Temperature Shutdown
NOTES and CONDITIONS
E48SB9R625 (Standard)
Min. Typ. Max. 60 117 125 2250 48 36.5 34.5 2 60 58.5 1.5 80 7 55 38 36 3 62 60 2.5 6.65 120 15 0.03 25 Units Vdc C C Vdc Vdc Vdc Vdc Vdc Vdc Vdc Vdc A mA mA A2s mA Vdc 400 3.6 200 11 150 40 240 140% mV V mV V mV mV W W % mV mV us ms ms F % % 2250 10 1000 130 Vdc M pF kHz 0.8 18 0.8 18 0.3 30 V V V V mA uA M hours grams C
Refer to Figure 17 for the measuring point, Tc
-40 -55 38 35 33 1 58 57 1
38V Vin , 100% Load
P-P thru 12H inductor, 5Hz to 20MHz Vin=48V, Io=no load, Ta=25C Io=Io,min to Io,max Vin=38V to 55V Tc=-40C to 100C Over sample load, line and temperature 5Hz to 20MHz bandwidth Full Load, 1F ceramic, 10F tantalum Full Load, 1F ceramic, 10F tantalum Full input voltage range Full input voltage range % of rated output current 48V, 10F Tan & 1F Ceramic load cap, 0.1A/s 50% Io.max to 75% Io.max 75% Io.max to 50% Io.max 8 15 Vin=48V Vin=48V
15 9.5 300 3.4 7.0 100 25 0 110% 10 80 80 90 15 20 96.5 96.0
150 150 120 25 30 3000
Von/off Von/off Von/off Von/off Ion/off at Von/off=0.0V Logic High, Von/off=15V Io=80% of Io, max; Ta=25C Refer to Figure 17 for the measuring point, Tc
-0.7 2 -0.7 2 0.25
1.86 31.76 122
DS_E48SB9R625_01232007
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ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nominal, and maximum input voltage at 25C
Figure 2: Power loss vs. load current for minimum, nominal, and maximum input voltage at 25C.
12 11 10 9
Output Voltage(V)
8 7 6 5 4 3 2 1 0 0 3 6 9 12 15 18 21 24 27 30 Output Current(A) 33 36 39 42 45
38Vin 48Vin 55Vin
Figure 3: Output voltage regulation vs load current showing typical current limit curves and converter shutdown points for minimum, nominal, and maximum input voltage at room temperature .
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Turn on Waveform
0
0
0
0
Figure 4: Turn-on transient at full rated load current (5 ms/div). Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF input: 2V/div
Figure 5: Turn-on transient at zero load current (5 ms/div). Top Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div
For Vin Input Turn on Waveform
0
0
0
0
Figure 6: Turn-on transient at full rated load current (5 ms/div). Top Trace: Vout; 5V/div; Bottom Trace: Vin; 50V/div.
Figure 7: Turn-on transient at zero load current (5 ms/div). Top Trace: Vout: 5V/div; Bottom Trace: Vin; 50V/div.
DS_E48SB9R625_01232007
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ELECTRICAL CHARACTERISTICS CURVES
0
0
0
0
Figure 8: Output voltage response to step-change in load current (50%-75%-50% of Io, max; di/dt = 0.1A/s). Load cap: 10F, tantalum capacitor and 1F ceramic capacitor. Top Trace: Vout (100mV/div, 100us/div), Bottom Trace: Iout (10A/div). Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.
Figure 9: Output voltage response to step-change in load current (50%-75%-50% of Io,max; di/dt=1A/s). Load cap: 10uF ,tantalum capacitor and 1F ceramic capacitor. Top Trace: Vout (200mV/div, 100us/div), Bottom Trace: Iout (5A/div). Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.
Figure 10: Test set-up diagram showing measurement points for Input Terminal Ripple Current and Input Reflected Ripple Current. Note: Measured input reflected-ripple current with a simulated source Inductance (LTEST) of 12 H. Capacitor Cs offset possible battery impedance. Measure current as shown below
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ELECTRICAL CHARACTERISTICS CURVES
0
0
Figure 11: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10H source impedance and 47F electrolytic capacitor (200 mA/div, 2us/div).
Figure 12: Input reflected ripple current, is, through a 10H source inductor at nominal input voltage and rated load current (20 mA/div, 2us/div).
Copper Strip Vo(+)
10u Vo(-)
1u
SCOPE
RESISTIVE LOAD
0
Figure 13: Output voltage noise and ripple measurement test setup.
Figure 14: Output voltage ripple at nominal input voltage and rated load current (50 mV/div, 2us/div). Load capacitance: 1F ceramic capacitor and 10F tantalum capacitor. Bandwidth: 20 MHz. Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.
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DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the DC/DC power modules will interact with the modules and affect the stability. A low ac-impedance input source is recommended. If the source inductance is more than a few H, we advise adding a 33 to 220F electrolytic capacitor (ESR < 0.5 at 100 kHz) mounted close to the input of the module to improve the stability.
Over-Temperature Protection
The over-temperature protection consists of circuitry that provides protection from thermal damage. If the temperature exceeds the over-temperature threshold the module will shut down, and enter in auto-restart mode or latch mode, which is optional. For auto-restart mode, the module will monitor the module temperature after shutdown. Once the temperature is within the specification, the module will be auto-restart. For latch mode, the module will latch off once it shutdown. The latch is reset by either cycling the input power or by toggling the on/off signal for one second.
Layout and EMC Considerations
Delta's DC/DC power modules are designed to operate in a wide variety of systems and applications. For design assistance with EMC compliance and related PWB layout issues, please contact Delta's technical support team. An external input filter module is available for easier EMC compliance design. Application notes to assist designers in addressing these issues are pending release.
Remote On/Off
The remote on/off feature on the module can be either negative or positive logic. Negative logic turns the module on during a logic low and off during a logic high. Positive logic turns the modules on during a logic high and off during a logic low. Remote on/off can be controlled by an external switch between the on/off terminal and the Vi(-) terminal. The switch can be an open collector or open drain. For negative logic if the remote on/off feature is not used, please short the on/off pin to Vi(-). For positive logic if the remote on/off feature is not used, please leave the on/off pin floating.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly process before the board or system undergoes electrical testing. Inadequate cleaning and/or drying may lower the reliability of a power module and severely affect the finished circuit board assembly test. Adequate cleaning and/or drying is especially important for un-encapsulated and/or open frame type power modules. For assistance on appropriate soldering and cleaning procedures, please contact Delta's technical support team.
Vi(+)
Vo(+)
FEATURES DESCRIPTIONS
Over-Current Protection
The modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules will automatically shut down, and enter hiccup mode or latch mode, which is optional. For hiccup mode, the module will try to restart after shutdown. If the overload condition still exists, the module will shut down again. This restart trial will continue until the overload condition is corrected. For latch mode, the module will latch off once it shutdown. The latch is reset by either cycling the input power or by toggling the on/off signal for one second.
ON/OFF
R Load Vo(-)
Vi(-)
Figure 15: Remote on/off implementation
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DESIGN CONSIDERATIONS
Current Sharing
The modules are capable of operating in parallel without any external current sharing circuitry. For a normal parallel operation, the following precautions must be observed: 1. The current sharing accuracy calculation equation is:
Current sharing accuracy=((I load/n)-I)*100%)/I rated Where, I load=Total load current; I= Output current of per converter; Irated=Converter's rated output current at different Vin; n=the numberous of parallel modules
2. The maximum load current for N converters is Imax=(1-X%)*N*Irated. Where, X% is current sharing load accuracy. Irated is 100% load for different Vin This unit has been tested with up to 2 units in parallel. 3. To ensure a better steady current sharing accuracy, below design guideline should be followed: a) The inputs of the converters must be connected to the same voltage source b) The PCB trace resistance from Input voltage source to Vin+ and Vin- of each converter should be as equalize as possible. c) The PCB trace resistance from each converter's output to the load should be equalized as much as possible. 4. To ensure a better transient current sharing, and the monotonic startup of the parallel module a) The ON/OFF pin of the converters should be connected together to keep the parallel modules start up at the approximately same time. b) The under voltage lockout point will slightly vary from unit to unit. The dv/dt of the rising edge of the input source voltage must be greater than 1V/ms to ensure that the parallel can start up at the approximately same time.
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THERMAL CONSIDERATIONS
Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel.
THERMAL CURVES
Thermal Testing Setup
Delta's DC/DC power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. This type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. The following figure shows the wind tunnel characterization setup. The power module is mounted on a test PWB and is vertically positioned within the wind tunnel. The space between the neighboring PWB and the top of the power module is constantly kept at 6.35mm (0.25'').
FACING PWB PWB
MODULE
0 50 55 60 65 70 75 80 85 Ambient Temperature ()
Figure 17: Temperature measurement location The allowed maximum hot spot temperature is defined at 117
Output Current(A)
E48SB9R625(Standard) Output Current vs. Ambient Temperature and Air Velocity @Vin = 48V (Transverse Orientation)
25
Natural Convection
20
100LFM
15
200LFM
300LFM
400LFM
10
500LFM
5
Figure 18: Output current vs. ambient temperature and air velocity@Vin=48V (Transverse Orientation).
AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE
AIR FLOW
50.8 (2.0")
12.7 (0.5")
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 16: Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the module. To enhance system reliability, the power module should always be operated below the maximum operating temperature. If the temperature exceeds the maximum module temperature, reliability of the unit may be affected.
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MECHANICAL DRAWING
Pin No.
1 2 3 4 5
Name
-Vin ON/OFF +Vin +Vout -Vout
Function
Negative input voltage Remote ON/OFF Positive input voltage Positive output voltage Negative output voltage
Pin Specification:
Pins 1-3 1.0mm (0.040") diameter Pins 4-5 1.5mm (0.060") diameter All pins are copper with Tin plating (Pb free)
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PART NUMBERING SYSTEM
E
Type of Product
E- Eighth Brick
48
Input Voltage
48- 38V~55V
S
Number of Outputs
S- Single
B
Product Series
B- Bus Converter
9R6
Output Voltage
9R6- 9.6V
25
Output Current
25- 25A
N
ON/OFF Logic
N- Negative P- Positive
R
Pin Length
R- 0.170" N- 0.145" K- 0.110"
F
A
Option Code
F- RoHS 6/6 (Lead Free)
A- OCP, OTP hiccup B- OCP, OTP latch-up
MODEL LIST
MODEL NAME
E48SB9R625NRFA E48SB12020NRFA
INPUT
38V~55V 38V~55V 6.65A 6.5A 9.6V 12V
OUTPUT
25A 20A 240W 240W
EFF @ 100% LOAD
96.5% 96.3%
Note:
1. 2. 3.
4.
Default remote on/off logic is negative; Default Pin length is 0.170"; Default OTP and output OVP, OCP mode is auto-restart. For different option, please refer to part numbering system above or contact your local sales office.
CONTACT: www.delta.com.tw/dcdc
USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: DCDC@delta-corp.com Europe: Telephone: +41 31 998 53 11 Fax: +41 31 998 53 53 Email: DCDC@delta-es.tw Asia & the rest of world: Telephone: +886 3 4526107 x 6220 Fax: +886 3 4513485 Email: DCDC@delta.com.tw
WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon request from Delta. Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications at any time, without notice.
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