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Technical S pecification
BQ55120ETL16
35-55V
Input
12V
Output
192Watt
Power
2000Vdc
Isolation
Eighth-brick
DC Bus Conver ter
The BusQorTM BQ55120ETL16 bus converter is a next-generation, board-mountable, isolated, fixed switching frequency dc/dc converter that uses synchronous rectification to achieve extremely high conversion efficiency. The power dissipated by the converter is so low that a heatsink is not required, which saves cost, weight, height, and application effort. The BusQor series provides an isolated step down voltage from 35-55V to a 12V intermediate bus with no regulation in a standard "eighth-brick" module. BusQor converters are ideal for creating the mid-bus voltage required to drive point-of-load (non-isolated) converters in intermediate bus architectures. RoHS com pliant (see page 12 ). Operational Features
* Ultra-high efficiency, >95% at full rated load current * Delivers up to 16 amps of output current (192W) with minimal derating - no heatsink required * Input voltage range: 35V - 55V provides 12V bus for distributed power architectures * Fixed frequency switching provides predictable EMI performance
Bus Conver ter
BQ55120ETL16 Module
Pr otection Features
* Input under-voltage lockout and over-voltage shutdown protects against abnormal input voltages * Output current limit and short circuit protection * Thermal shutdown
Mechanical Features
* Industry standard eighth-brick bus converter pin-out * Industry standard size: 0.90" x 2.3" (22.9x58.4mm) * Total height only 0.320" (8.13mm), permits better airflow and smaller card pitch * Total weight: 0.7 oz. (20 grams) * Flanged pins designed to permit surface mount soldering (avoid wave solder) using FPiP technique
Safety Features
* 2000V, 30 M input-to-output isolation * UL/cUL 60950 recognized (US & Canada), basic insulation rating * TUV certified to EN60950 * Meets 72/23/EEC and 93/68/EEC directives * Meets UL94V-0 flammability requirements
Contr ol Features
* On/Off control referenced to input side (positive and negative logic options available)
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Doc.# 005-2BE552B Rev. A
03/16/06
Page 1
Technical Specification
MECHANICAL DIAGRAM
2.00
(50.8)
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
2.30
(58.4)
0.14
(3.6)
Top View
0.15
(3.8)
1 2 3
0.600
(15.24)
5
0.90
(22.9)
4
0.300
(7.62)
0.025 +0.013
(0.64 +0.33)
Side View
Bottom side Clearance
See Note 9
0.145
(3.68) See Note 3
Lowest Component
Load Board
Flanged Pin See Note 10
0.320 +0.015
(8.13 +0.38)
Overall height
NOTES
1) Pins 1-3 are 0.040" (1.02mm) diameter with 0.080" (2.03 mm) diameter standoff shoulders. 2) Pins 4 and 5 are 0.062" (1.57 mm) diameter with 0.100" (2.54 mm) diameter standoff shoulders. 3) Other pin extension lengths available. Recommended pin length is 0.03" (0.76mm) greater than the PCB thickness. 4) All Pins: Material - Copper Alloy Finish - Tin/Lead over Nickel plate 5) Undimensioned components are shown for visual reference only. 6) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 7) Weight: 0.7 oz. (20 g) typical 8) Workmanship: Meets or exceeds IPC-A-610C Class II 9) UL/TUV standards require a clearance of 0.04" (1.02mm) around primary areas of the module. Refer to section on Keep Out Areas under Application Considerations for details. 10) The flanged pins are designed to permit surface mount soldering (avoiding the wave soldering process) through the use of the flanged pin-in-paste technique.
PIN DESIGNATIONS
Pin No.
1 2 3 4 5
Name
Vin(+) ON/OFF Vin(-) Vout(-) Vout(+)
Function
Input Positive (35V - 55V) Logic control input to turn converter on and off. Input Negative Output Negative Output Positive
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Doc.# 005-2BE552B Rev. A
03/16/06
Page 2
Technical Specification
BQ55120ETL16 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
TA=25C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40C to +100C ambient temperature with appropriate power derating. Specifications subject to change without notice.
Min. Typ. Max.
60 56 2000 100 125 18 48 32.0 30.5 1.5 59.0 58.0 7 5 50 1.5\2.0 47 12.00 +20 \ 2.4 +4.1 \ 500 +1.7 \ 200 8.0 100 20 0 25 Vin / 8 +10 10 3,000 200 200 9 3 0 95.3 95.5 125 125 125 2000 30 13.8 150 40 16 4.7 0.1 15 0.1 100 12 55
Units
V V V C C V V V V V V V A A mA A 2s mA mA A H\F F V %\V %\mV %\mV V mV mV A A V % mA F mV s ms ms % % % C C C V M
Notes & Conditions
Continuous Continuous Basic insulation, Pollution Degree 2
Input Voltage Non-Operating Operating Isolation Voltage (input to output) Operating Temperature Storage Temperature Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
-40 -55 -2 35
Operating Input Voltage Range Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Voltage Hysteresis Input Over-Voltage Shutdown Turn-Off Voltage Threshold Turn-On Voltage Threshold Maximum Input Current No-Load Input Current Disabled Input Current Inrush Current Transient Rating Input Reflected Ripple Current Input Terminal Ripple Current Recommended Input Fuse Input Filter Component Values (L\C) Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
100% Load, 35Vin
RMS through 10H inductor; Figures 12 & 14 RMS, full load; Figures 12 & 13 Fast blow external fuse recommended Internal values Typical ESR 0.1-0.2, see Figure 12 48Vin, no load Figure 4 Figure 4 Figure 4 Over sample, line, load, temperature & life 20MHz bandwidth; Figures 12 & 15 Full Load, see Figures 12 & 15 Full Load, see Figures 12 & 15 Subject to thermal derating; Figures 5 - 8 Output Voltage 10% Low; Figure 16 % of rated output current Negative current drawn from output 12Vout at 16A Resistive Load 50% to 75% to 50% Iout max; Figure 11 To within 1% Vout nom Full load, Vout=90% nom.; Figures 9 & 10 -40C to +125C 2,500 F load capacitance, Iout = 0A Figures 1 - 3 Figures 1 - 3 Package rated to 150C UL rated max operating temp 130C See Figures 5 - 8 for derating curves
Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise1 Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage Current Share Accuracy (2 units paralleled) Back-Drive Current Limit while Disabled Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient For a Step Change in Output Current (0.1A/s) Settling Time Turn-On Transient Turn-On Time Start-Up Inhibit Time Output Voltage Overshoot
EFFICIENCY
100% Load 50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature Board Temperature Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength) Isolation Resistance
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com).
Product # BQ55120ETL16
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Doc.# 005-2BE552B Rev. A
03/16/06
Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
FEATURE CHARACTERISTICS
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
Min.
165 -1.0 2.4 2.4 -1.0
Typ.
190
Max.
215 0.8 18 18 0.8
Units
kHz V V V V
Notes & Conditions
Switching Frequency ON/OFF Control (Option P) Off-State Voltage On-State Voltage ON/OFF Control (Option N) Off-State Voltage On-State Voltage ON/OFF Control (Either Option) Pull-Up Voltage Pull-Up Resistance Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Figures A & B 10 30 140 10 1333 2.81 0.91 150 V k C C Average PCB Temperature See App Note: Output Load Current Calc. 106 Hrs. TR-NWT-000332; 100% load,300LFM, 40oC Ta 106 Hrs. MIL-HDBK-217F; 100% load, 300LFM, 40oC Ta 106 Hrs. See our website for details
Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF
STANDARDS COMPLIANCE
Parameter P
STANDARDS COMPLIANCE
Notes
File # E194341, Basic insulation & pollution degree 2 Certified by TUV Test on entire assembly; board & plastic components UL94V-0 compliant ESD test, 8kV - NP, 15kV air - NP (Normal Performance) Section 7 - electrical safety, Section 9 - bonding/grounding
UL/cUL 60950 EN60950 72/23/EEC 93/68/EEC Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 GR-1089-CORE
* An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
# Units
32 5 5 10 5 5 5 3
Test Conditions
10-55Hz sweep, 0.060" total excursion,1 min./sweep, 120 sweeps for 3 axis
Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability
95% rated Vin and load, units at derating point, 1000 hours
100g minimum, 2 drops in x and y axis, 1 drop in z axis -40C to 100C, unit temp. ramp 15C/min., 500 cycles Toperating = min to max, Vin = min to max, full load, 100 cycles Tmin-10C to Tmax+10C, 5C steps, Vin = min to max, 0-105% load 85C, 85% RH, 1000 hours, 2 minutes on and 6 hours off MIL-STD-883, method 2003
* Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply robust, reliable product. Contact the factory for official product family qualification documents.
OPTIONS
SynQor provides various options for Logic Sense, Pin Length and Feature Set for this family of DC/DC converters. Please consult the last page of this specification sheet for information on available options.
Product # BQ55120ETL16 Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417; 6,222,742 B1; 6,594,159 B2; 6,545,890 B2.
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Doc.# 005-2BE552B Rev. A
03/16/06
Page 4
Technical Specification
100 11 10 95 9
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
Power Dissipation (W)
35 Vin
8 7 6 5 4 3 2 1 0 35 Vin 48 Vin 55 Vin
Efficiency (%)
90
85
80
75
48 Vin 55 Vin
70 0 2 4 6 8 10 12 14 16
0
2
4
6
8
10
12
14
16
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 2: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
97
14 13
96
12
Output Voltage (V)
25 C 40 C 55 C
Efficiency (%)
11 10 9 8 7 6 35V 48V 55V
95
94
93 100 200 300 400
0
2
4
6
8
10
12
14
16
Air Flow (LFM)
Load Current (A)
Figure 3: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25C, 40C, and 55C (nominal input voltage).
18 16 14 12
Figure 4: Output voltage regulation vs. load current for minimum, nominal, and maximum input voltage at 25C.
Iout (A)
10 8 6 400 LFM (2.0 m/s) 4 2 0 0 25 40 55 70 85 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
Ambient Air Temperature (C)
Semiconductor junction temperature is within 1C of surface temperature
Figure 5: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from pin 3 to pin 1 (nominal input voltage).
Product # BQ55120ETL16 Phone 1-888-567-9596
Figure 6: Thermal plot of converter at 16 amp load current (192W) with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from pin 3 to pin 1 (nominal input voltage).
Doc.# 005-2BE552B Rev. A 03/16/06 Page 5
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Technical Specification
18 16
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
Semiconductor junction temperature is within 1C of surface temperature
14 12
Iout (A)
10 8 6 400 LFM (2.0 m/s) 4 2 0 0 25 40 55 70 85 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
Ambient Air Temperature (C)
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 16 amp load current (192W) with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from output to input (nominal input voltage).
Figure 9: Turn-on transient at half load (resistive load) and 3mF output capacitance (2.0ms/div). Input voltage pre-applied. Channel 1: Vout (2V/div). Channel 2: ON/OFF input (2V/div).
Figure 10: Turn-on transient at zero load and 3mF output capacitance (2.0ms/div). Input voltage pre-applied. Channel 1: Vout (2V/div). Channel 2: ON/OFF input (2V/div).
See Fig. 14
source impedance
10 H
See Fig. 13 See Fig. 15
iS
VSOURCE
iC
DC/DC Converter 1 F
VOUT
15 F,
47 F, <1 ESR
electrolytic capacitor
ceramic 450m ESR capacitor tantalum capacitor
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/s). Load cap: 15F, 100 m ESR tantalum cap and 1F ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (5A/div).
Product # BQ55120ETL16 Phone 1-888-567-9596
Figure 12: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 13), Input Reflected Ripple Current (Figure 14) and Output Voltage Ripple (Figure 15).
Doc.# 005-2BE552B Rev. A 03/16/06 Page 6
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Technical Specification
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
Figure 13: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10H source impedance and 47F electrolytic capacitor (50 mA/div). See Figure 12.
Figure 14: Input reflected ripple current, is, through a 10 H source inductor at nominal input voltage and rated load current (5mA/div). See Figure 12.
14 12 10 8 6 4 35V 2 0 0 5 10 15 20 25 30 48V 55V
Output Voltage (V)
Load Current (A)
Figure 15: Output voltage ripple at nominal input voltage and rated load current (50 mV/div). Load capacitance: 1F ceramic capacitor and 15F tantalum capacitor. Bandwidth: 20 MHz. See Figure 12.
Figure 16: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
1 35 Vin 48 Vin
Output Impedance ( )
55 Vin
0.1
0.01 10 100 1,000 10,000 100,000
Hz
Figure 17: Load current (10A/div) as a function of time when the converter attempts to turn on into a 1 m short circuit. Top trace (5.0ms/div) is an expansion of the on-time portion of the bottom trace.
Product # BQ55120ETL16 Phone 1-888-567-9596
Figure 18: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power.
Doc.# 005-2BE552B Rev. A 03/16/06 Page 7
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Technical Specification
10 10
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
Forward Transmission (dB)
-10
Reverse Transmission (dB)
0
0
-10
-20
-20
-30
35 Vin 48 Vin 55 Vin
-30
35 Vin 48 Vin 55 Vin
-40 10 100 1,000 10,000 100,000
-40 10 100 1,000 10,000 100,000
Hz
Hz
Figure 19: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power.
10000
Figure 20: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power.
1000
Input Impedance ( )
100
10
1
35 Vin 48 Vin 55 Vin
0.1 10 100 1,000 10,000 100,000
Hz
Figure 21: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power.
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Doc.# 005-2BE552B Rev. A
03/16/06
Page 8
Technical Specification
BASIC OPERATION AND FEATURES
With voltages dropping and currents rising, the economics of an Intermediate Bus Architecture (IBA) are becoming more attractive, especially in systems requiring multiple low voltages. IBA systems separate the role of isolation and voltage scaling from regulation and sensing. The BusQor series bus converter provides isolation and an unregulated voltage step down in one compact module, leaving regulation to simpler, less expensive non-isolated converters. In Figure A below, the BusQor module provides the isolation stage of the IBA system. The isolated bus then distributes power to the non-isolated buck regulators to generate the required voltage levels at the points of load. In this case, the bucks are represented with SynQor's NiQor series of non-isolated dc/dc converters. In many applications requiring multiple low voltage outputs, significant savings can be achieved in board space and overall system costs. When designing an IBA system with bus converters, the designer can select from a variety of bus voltages. While there is no universally ideal bus voltage, most designs employ one of the following: 12V, 9V, 7.5V, 5V, or 3.3V. Higher bus voltages can lead to lower efficiency for the buck regulators but are more efficient for the bus converter and provide lower board level distribution current. Lower bus voltages offer the opposite trade offs. SynQor's 12Vout BusQor module acts as a true dc transformer. The output voltage is proportional to the input voltage, with a specified "turns ratio" or voltage ratio, plus minor drop from the internal resistive losses in the module. When used in IBA systems,
3.3 V Vin2.5 V
48Vdc 35-55V
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
the output variation of the BusQor must be in accordance with the input voltage range of the non-isolated converters being employed. The BusQor architecture is very scalable, allowing for multiple bus converters can be connected directly in parallel to allow current sharing for higher power applications.
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure B is a detailed look of the internal ON/OFF circuitry. Positive logic enabled modules have N-channel FET populated. Negative logic enabled modules have P-channel FET populated.
Vin+
5V 124k
On/Off
49.9k TTL 100k
BusQor
Converter
12Vdc
Figure B: Internal ON/OFF pin circuitry
1.8 V
1.5 V
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the application note titled "Input System Instability". The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Also see Figure E.
Doc.# 005-2BE552B Rev. A 03/16/06 Page 9
0.9 V
Typical User Board
NiQor Loads Converters
48Vdc Front End
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter and NiQor non-isolated converters
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Technical Specification
Output Current Limit: The output of the BusQor module is electronically protected against output overloads. When an overload current greater than the "DC Current-Limit Inception" specification is drawn from the output, the output shuts down to zero volts in a period of 10mS typical (see Figure C). The shutdown period lasts for a typical period of 250mS (Figure D) after which the BusQor tries to power up again. If the overload persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 4% (On) and 96% (Off) respectively. The BusQor module returns (auto resetting) to normal operation once the overload is removed. The BusQor is designed to survive in this mode indefinitely without damage and without human intervention.
Output Current 25A 16A
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
the short circuit persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 4% (On) and 96% (Off) respectively. The BusQor module returns (auto recovery) to normal operation once the short circuit is removed. The BusQor is designed to survive in this mode indefinitely without damage and without human intervention. In the Auto recovery mode, also referred to as "Hiccup" mode, the power drawn from the 48V input is about 5 Watts, most of which is dissipated into the external fault. It is important that copper traces and pads from the output circuit be designed to withstand the short term peaks, although the average current into the fault may be as low as 2A typical. See Figure 17 for appropriate waveform. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the OverTemperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value.
Output Voltage 12V
0V 10ms Time
APPLICATION CONSIDERATIONS
Start-Up Inhibit Period: Figure E details the Start-Up Inhibit Period for the BusQor module. At time t0, when Vin is applied with On/Off pin asserted (enabled), the BusQor output begins to build up. Before time t1, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under-Voltage Lockout feature. When the input voltage rises above the UVL threshold, the Input Under-Voltage Lockout is released, and a typical Startup Inhibit Period of 3mS is initiated. The output builds up to 90% or higher of the nominal voltage and stabilizes at the nominal value of 12.0V. The rise time from 0V to 90% is 1.5mS typical. At time t2, when the On/Off pin is de-asserted (disabled), the BusQor output instantly drops to 0V. Fall time from 12.0V to 0V is dependent on output capacitance and any parasitic trace inductance in the output load circuit. At time t3, when the On/Off pin is re-asserted (enabled), the BusQor module output begins to build up after the inhibit period of 3mS typical. Refer to the Control Features section of the data sheet for details on enabling and disabling methods for N and P logic type modules.
Figure C: Output Overload protection diagram (not to scale)
Output Short Circuit Protection: When the output of the BusQor module is shorted, a peak current of typically 34A will flow into the short circuit for a period of about 10mS. The output of the BusQor will shutdown to zero volts for the same period (Figure E). The shutdown period lasts for a period of 250mS, at the end of which the BusQor module tries to power up again. If
Output Current 34A peak
Output Voltage 12V
0V Time 250ms 10ms
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to scale)
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Technical Specification
Vin UVLO
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
Copper Keep Out Area: Keep out areas shown in Figure F are to be observed for Top layer copper traces and vias. Internal layers buried one or more layers may be exempt, depending on the PCB material grade and thickness. Users are advised to consult UL standards for details. All layers including top and bottom, are subject to the keep out areas shown around Primary pins of BusQor module. Actual keep outs along the surface (Creepage) may vary depending on the PCB material CTI. Users are advised to consult UL standards for details.
t0 t1 t2 t3
On/Off
(N logic)
OFF ON
t
Vout 12V
3ms 3ms 4.5ms
Time
Bridging Components: Bridging components like EMI filter capacitors required to be placed as close as possible to the BusQor module for optimum performance must observe the clearance/creepage requirements of 0.04"(40 mils) between pads to maintain compliance to UL standards for the overall power system. Note: Referenced keep out widths are adequate to withstand UL's Basic Insulation Dielectric strength tests for approved PCB materials. Applications requiring Double or Reinforced insulation must double the keep out widths shown in Figure F. Keep out areas shown have standard margins above UL's minimum requirements. Output Load Current Calculation: The BusQor series allows the converter output load to be measured without adding a current loop or external shunt resistor to the designer's PCB board under test. On the top side of the BusQor converter is a current sense resistor as shown in Figure G. The output load current is proportional to the voltage drop across this sense resistor. This calculation is detailed below. A current sense resistor referenced to the primary input is used in the equation below to calculate the output load current.
Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period.
Keep Out Areas: Component Keep Out Area: Keep out areas for components not referenced to the Primary circuit are shown in shaded areas in Figure F. The keep out areas shown are consistent with UL's requirements for Basic Insulation of 0.04" (40 mils) for Pollution degree 2. User should consult UL standards for other insulation classes and operating environments.
Iload = ( VRsense(load) - VRsense(no load) ) x 1333
where:
Iload = output load current
VRsense(load) = voltage across the sense resistor with
converter under load
0.010"
VRsense(no load) = voltage across the sense resistor with
converter at zero load
Figure F: Keep Out Areas for BusQor module
For applications that require mounting parts BELOW the BusQor module, one should be aware of potential high levels of electromagnetic interference, in addition to safety keep out. Users are advised to consult SynQor Applications engineering in such applications.
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The number 1333 is a "Load Current Scale Factor" for this product, valid only for Vin = 48V. Hence, measurement should be made at this input voltage. The voltage drop across the sense resistor is about 12mV at a full load of 16A. Therefore, proper measuring techniques must
Doc.# 005-2BE552B Rev. A 03/16/06 Page 11
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Technical Specification
be used to ensure accuracy. A calibrated DMM set to 300mV is acceptable. Since this measurement is done on the Primary area of the converter, a slight non-linearity may be observed over the load current range. Using the Scale Factor referenced above, the error may be on the order of 4%. For more detailed information consult the application note on SynQor's web site titled "Output Load Current Calculations". Current Sharing: BusQor modules are designed to operate in
Input: Output: Current: Package:
35-55 V 12 V 16 A (192W) Eighth-brick
The current share performance of two paralleled modules is illustrated in the graph in Figure J. In this graph the percent deviation from ideal sharing (50%) is plotted for each module versus the total output load current at 48Vin.
2.0% 1.5% 1.0% 0.5% 0.0% -0.5% -1.0% -1.5% -2.0% 4 8 12 16 20 24 28 32 Module 1 Module 2
Deviation from 50/50 Sharing (%)
Total Load Current (A)
Figure G: Location of Sense Resistors
parallel without the use of any external current share circuitry. A typical circuit for paralleling two BusQor modules is shown in Figure H. An output capacitor is recommended across each module and located close to the converter for optimum filtering and noise control performance. Dedicated input inductors are recommended but are considered optional. Input capacitors must be located close to the converter module. PCB layout in the input circuit should be such that high frequency ripple currents of each module is restricted to a loop formed by the input capacitors and the input terminals of the BusQor module. See Figure K for details on PCB layout. Contact SynQor application engineering for further assistance on PCB trace design.
Figure J: Current share performance of 2 paralleled modules
48Vin CM EMI filter
BusQor module
Bulk Cap
BusQor module
(Not shown in Figure H)
Input LC filters
Figure K: Recommended PCB layout for input circuit
1
5
Vin
2 3 1
BusQor module (N logic option)
4
5
BusQor module (N logic option)
2 3 4
RoHS Compliance: The EU led RoHS (Restriction of Hazardous Substances) Directive bans the use of Lead, Cadmium, Hexavalent Chromium, Mercury, Polybrominated Biphenyls 12Vout (PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical 32A and Electronic Equipment. This SynQor product is available as 5/6 RoHS compliant (product with lead) or 6/6 RoHS compliant. For more information please refer to SynQor's RoHS addendum available at our RoHS Compliance / Lead Free Initiative web page or e-mail us at rohs@synqor.com.
Figure H: BusQor Output Paralleling for increased current output.
Product # BQ55120ETL16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE552B Rev. A
03/16/06
Page 12
Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's BusQor DC bus converters follows the format shown in the example below.
BQ 55 120 E T L 16 N N S Options (see Ordering Information) Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family
Model Number
Input: Output: Current: Package:
ORDERING INFORMATION
35-55 V 12 V 16 A (192W) Eighth-brick
The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. To order 6/6 RoHS compliant product please add a "-G" suffix.
Input Voltage 35 - 55 V 43 - 52 V Output Max Output Voltage Current 12 V 16 A 12 V 16 A
BQ55120ETL16xyz BQ50120ETL16xyz
The following option choices must be included in place of the x y z spaces in the model numbers listed above.
Options Description: x y z
Enable Logic P - Positive N - Negative Pin Length K - 0.110" N - 0.145" R - 0.180" Y - 0.250" Feature Set
The first 12 characters comprise the base part number and the last 3 characters indicate available options. Although there are no default values for enable logic and pin length, the most common options are negative logic and 0.145" pins. These part numbers are more likely to be readily available in stock for evaluation and prototype quantities.
S - Auto Recovery
Application Notes
A variety of application notes and technical white papers can be downloaded in pdf format from our website.
Contact SynQor for further information:
Phone: Toll Free: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 power@synqor.com www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA
Phone 1-888-567-9596
Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor.
Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor 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 SynQor.
Doc.# 005-2BE552B Rev. A 03/16/06 Page 13
Product # BQ55120ETL16
www.synqor.com

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