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Technical S pecification
BQ50120QTA20
42-53V
Input
12V
Output
240Watt
Power
2000Vdc
Isolation
Quar ter-brick
DC Bus Conver ter
T he Bu s Qo r TM B Q 5 0 1 2 0 Q T A 2 0 b u s c o n v e r t e r i s a n e x t - g e n e ra tion , bo ar d -mo un ta bl e, is ol ated , fixe d s witchi ng fr eq uen c y d c/d c con verter tha t u se s s y nch r on ou s r ectifi catio n to a ch ieve extr emel y h igh con vers ion effic ien cy. Th e p ower d is sip a t ed b y t he con v er te r is so l ow th a t a h eat s in k is no t r eq ui red , whic h s av es c os t, wei ght , hei ght , an d a p pl ica t ion e ffor t. T he Bu sQ or ser ies p r ov id es a n iso la t ed s t ep d own vol tage fr om 48V to a 1 2V inter med ia te b us with n o regu l a tio n i n a s ta n da r d " q ua rt er - br ick " mod ul e. B us Q or con v er t ers a r e id ea l fo r cu st om ers wh o n eed mu l tip l e ou t p ut s a n d wish to bu il d o r bu y p oin t of loa d co nver ter s to wor k with a 12V rail. RoHS Compliant (see page 12 ). Bus Conver ter
Operational Features
* Ultra-high efficiency, >96% at full rated load current * Delivers up to 20 amps (240 Watts) of output current (power) with minimal derating - no heatsink required * Input voltage range: 42V - 53V * Fixed frequency switching provides predictable EMI performance
BQ50120QTA20 Module
Pr otection Features
* Input under-voltage lockout and over-voltage shutdown protects against abnormal input voltages * Output current limit and short circuit protection * Output over-voltage protection * Thermal shutdown
Mechanical Features
* Industry standard quarter-brick bus converter pin-out * Industry standard size: 1.45" x 2.3" (36.8x58.4mm) * Total height only 0.43" (10.9mm), permits better airflow and smaller card pitch * Total weight: 1.5 oz. (42 grams) * Flanged pins designed to permit surface mount soldering (can avoid wave solder) using FPiP technique
Safety Features
* 2000V, 30 M input-to-output isolation * UL/cUL 60950-1 recognized (US & Canada), basic insulation rating * TUV certified to EN60950-1 * Meets 72/23/EEC and 93/68/EEC directives * Meets UL94V-0 flammability requirements
Contr ol Features
* On/Off control referenced to input side * Current sharing allowed without the use of any external circuitry.
Product # BQ50120QTA20
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Doc.# 005-2BQ512J Rev. E
03/17/06
Page 1
Technical Specification
MECHANICAL DIAGRAM
2.30
(58.4)
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
0.14
(3.6)
2.00
(50.8)
0.43
(10.8)
Top View
0.600
(15.24)
1.45
(36.8)
0.600
(15.24)
0.300
(7.62)
Side View
Bottom side Clearance
See Note 9
0.43
(10.9)
0.060+/-0.030
(1.52+/-0.76)
Lowest Component
Load Board
Flanged Pin See Note 10
0.145
(3.68) See Note 3
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 (6/6 RoHS) - Matte Tin over Nickel plate Finish (5/6 RoHS) - 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: 1.5 oz. (42 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 (allowing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique.
Product # BQ50120QTA20 Phone 1-888-567-9596
PIN DESIGNATIONS
Pin No.
1 2 3 4 5
Name
Vin(+) ON/OFF Vin(-) Vout(-) Vout(+)
Function
Input Positive (42V - 53V) Logic control input to turn converter on and off. Input Negative Output Negative Output Positive
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Doc.# 005-2BQ512J Rev. E
03/17/06
Page 2
Technical Specification
BQ50120QTA20 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-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 12 48 39.5 38.0 1.5 55.0 54.0 7.5 5 75 1\1.5\2 47 12.00 +10 \ 1.2 +4.1 \ 500 +1.7 \ 200 30 15 24.8 8 +10 10 53
Units
V V V C C V V V V V V V A A mA A 2s mA mA A F\H\F F V %\V %\mV %\mV V mV mV A A V % mA F mV s s ms % % %
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
-40 -55 -2 42
INPUT CHARACTERISTICS
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 Fuse1 Input Filter Component Values (C\L\C) Recommended External Input Capacitance Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise2 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 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 100% Load 50% Load Semiconductor Junction Temperature Board Temperature Transformer Temperature
6.3 0.17 15 0.01 100 12
Vin when unit will shut down Vin when unit turns on after shutdown event 100% Load, 42 Vin I2T rating of external fuse should be higher 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 20A 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; Figure E 5,000 F load capacitance, Iout = 0A Figure 1 Figure 1 Package rated to 150C UL rated max operating temp 130C See Figures 5 - 8 for derating curves
OUTPUT CHARACTERISTICS
9.7
13.3 60 20 20
0
3,000
DYNAMIC CHARACTERISTICS
200 100 500 2 5 96.5 96.3 125 125 125 2000 30
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
C C C V M pF
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)3 Isolation Resistance Isolation Capacitance4
470
Note 1: UL's product certification tests were carried out using 20A fast blow fuse. Fuse interruption characteristics have to be taken into account while designing input traces. User should ensure that Input trace is capable of withstanding fault currents until fuse blows. Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com) Note 3: For modules with isolation voltage rating of 2250V, order the Feature Set option C. See last page for ordering details. Note 4: Higher values of isolation capacitance can be added external to the module.
Product # BQ50120QTA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2BQ512J Rev. E 03/17/06 Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
Min.
127.5 -1.0 2.4 2.4 -1.0
Typ.
150
Max.
172 0.8 18 18 0.8
Units
kHz V V V V V C C
Notes & Conditions
Figure B Figure B Over full temp range; no load Average PCB Temperature See App Note: Output Load Current Calc.
Switching Frequency ON/OFF Control (Option P) Off-State Voltage On-State Voltage ON/OFF Control (Option N) Off-State Voltage On-State Voltage Output Over-Voltage Protection Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis Load Current Scale Factor Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF
13.75 120 10 800 2.7 2.0
RELIABILITY CHARACTERISTICS
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
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 60950-1 EN60950-1 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 15 pins
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 for information on available options.
PATENTS
SynQor is protected under various patents, including but not limited to U.S. Patent numbers 5,999,417; 6,222,742 B1; 6,594,159 B2; 6,545,890 B2.
Product # BQ50120QTA20
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Doc.# 005-2BQ512J Rev. E
03/17/06
Page 4
Technical Specification
100 98 10 9
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
Efficiency (%)
94 92 90 88 86 84 82 80 0 2 4 6 8 10 12 14 16 18 20 42 Vin 48 Vin 52 Vin
Power Dissipation (W)
96
8 7 6 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16
42 Vin 48 Vin 52 Vin
18 20
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.
98
15 14
97
Output Voltage (V)
13 12 11 10 42Vin 9 8 0 2 4 6 8 10 12 14 16 18 20 48Vin 52Vin
Efficiency (%)
96
95
94
93
25 C 40 C 55 C
0 100 200 300 400 500
92
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).
20 18 16 14
Figure 4: Output voltage regulation vs. load current for minimum, nominal, and maximum input voltage at 25C.
Iout (A)
12 10 8 6 4 2 0 0 25 40 55 70 85
400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 LFM (0 m/s)
Ambient Air Temperature (oC)
Semiconductor junction temperature is within 1C of surface temperature
Figure 5: Maximum output power derating curves vs. ambient air temperature for airflow rates of 0 LFM through 400 LFM with air flowing from pin 3 to pin 1 (nominal input voltage).
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Figure 6: Thermal plot of converter at 20 amp load current (240W) 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.# 005-2BQ512J Rev. E 03/17/06 Page 5
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Technical Specification
20 18 16 14
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
Iout (A)
12 10 8 6 4 2 0 0 25 40 55 70 85
400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 LFM (0 m/s)
Ambient Air Temperature (oC)
Semiconductor junction temperature is within 1C of surface temperature
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 0 LFM through 400 LFM with air flowing from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 20 amp load current (240W) with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (2 ms/div). Ch 1: Vout (5V/div); Ch 2: ON/OFF Pin (5V/div).
Figure 10: Turn-on transient at zero load (2 ms/div). Ch 1: Vout (5V/div); Ch 2: ON/OFF Pin (5V/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).
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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.# 005-2BQ512J Rev. E 03/17/06 Page 6
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Technical Specification
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-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 (100 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 (5 mA/div). See Figure 12.
14 13
Output Voltage (V)
12 11 10 9 8 0 5 10 15 20 25
Load Current (A)
43V 48V 53V
Figure 15: Output voltage ripple at nominal input voltage and rated load current (20 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.
Figure 17: Load current (20A/div) as a function of time when the converter attempts to turn on into a 1 m short circuit. Top trace (200s/div) is an expansion of the on-time portion of the bottom trace.
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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 a coarse 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 point 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, the output variation of the BusQor must be in accordance
3.3 V
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
with the input voltage range of the non-isolated converters being employed. The BusQor architecture is very scalable, meaning 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.
Control
Vin+ P-channel FET
N-channel FET
Vref (8V) 30 k 5 k On/Off 13V 100 k Vin-
2.5 V
48Vdc 42-53V
Figure B: Internal ON/OFF pin circuitry
BusQor
Converter
12Vdc
1.8 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" available on the SynQor website. 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.# 005-2BQ512J Rev. E 03/17/06 Page 8
1.5 V
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 volt in a period of 40s 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 40s (On) and 250ms (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 20A
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
the short circuit persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 350s (On) and 250ms (Off) respectively. The BusQor module returns (auto resetting) 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 resetting 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 50mA 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 40s 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 350s is initiated. The output builds up to 90% or higher of the nominal voltage and stabilizes at the nominal value of 12V in a period of 420s typical. The rise time from 0V to 90% is 70s typical. At time t2, when the On/Off pin is de-asserted (disabled), the BusQor output instantly drops to 0V. Fall time from 12V 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 350s 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 40 A will flow into the short circuit for a period of about 300s. The output of the BusQor will shutdown to zero volts for the same period (Figure D). 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 40A peak
Output Voltage <12V
0V Time 250ms 300s
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:
42-53 V 12 V 20 A Quarter-brick
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. 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.
t0 t1 t2 t3
On/Off
(N logic)
OFF ON
t
Vout 12V
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. 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.
16ms 2ms 16.1ms
Time
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.
0.01"
0.023"
Iload = (VRsense(load) - VRsense(no load) ) x 800
0.01" Bridging Capacitor
where:
1.50" Primary Secondary
Iload = output load current
VRsense(load) = voltage across the sense resistor with
converter under load
Figure F: Keep Out Areas for BusQor module
VRsense(no load) = voltage across the sense resistor with
converter at zero load
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Technical Specification
The number 800 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 25mV at full load of 20A. Therefore, proper measuring techniques must 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 website titled "Output Load Current Calculations".
Input: Output: Current: Package:
42-53 V 12 V 20 A Quarter-brick
for further assistance on PCB trace design. 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.
Deviation from 50/50 Sharing (%)
10% 8% 6% 4% 2% 0% -2% -4% -6% -8% 5 10 15 20 25 30 35 40
Module 1 Module 2
Total Load Current (A)
Figure J: Current share performance of 2 paralleled modules
Figure G: Location of Sense Resistors
Current Sharing: BusQor modules are designed to operate in 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
1 5
BusQor module (N logic option)
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
Vin
2 3
12Vout 40A
4
1
BusQor module (N logic option)
5
2 3
4
Figure H: BusQor Output Paralleling for increased current output.
Product # BQ50120QTA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2BQ512J Rev. E 03/17/06 Page 11
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 50 120 Q T A 20 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
42-53 V 12 V 20 A Quarter-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 36 - 55 V 42 - 53 V 42 - 53 V Output Max Output Voltage Current 9.6 V 27 A 12 V 20 A 12 V 25 A
BQ55090QTA27xyz BQ50120QTA20xyz BQ50120QTA25xyz
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 Pin Length 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. A "-G" suffix indicates 6/6 RoHS compliance.
K - 0.110" S - Standard P - Positive N - 0.145" C - no common N - Negative R - 0.180" mode capacitor Y - 0.250"
Units with option C for the Feature Set are a standard unit with the common mode capacitor removed. The isolation voltage rating of the C option unit is 2250Vdc.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous Substances) Directive bans the use of Lead, Cadmium, Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical 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.
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.# 005-2BQ512J Rev. E 03/17/06 Page 12
Product # BQ50120QTA20
www.synqor.com

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