27A [189W - 297W]

Technical
Specification
BQ55090ETA27
35-55 V
9.6 V
27 A
250 W
2000 V dc
Eighth-brick
Input
Output
Current
Power
Isolation
DC-DC Converter
®
The BusQor® BQ55090ETA27 bus converter is a nextgeneration, 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 ow that a
heatsink is not required, which saves cost, weight, height,
and application effort. The BusQor eries provides an isolated
step down voltage from 48 to 9.6 V 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 compliant (see last
page).
BQ55090ETA27 Model
Operational Features
Mechanical Features
• Ultra-high efficiency, > 95% at full rated load current
• Delivers up to 27 amps of output current with minimal derating - no
heatsink required
• Input voltage range: 35 V - 55 V provides 6.5 V - 11 V bus for
distributed power architectures
• Fixed frequency switching provides predictable EMI performance
• Industry standard eighth-brick bus converter pin-out
• Size: 0.90" x 2.3" (22.9 x 58.4 mm) x 0.484" (12.29 mm)
• Total weight: 0.7 oz. (20 grams)
Protection Features
• Input under-voltage lockout and over-voltage shutdown protects
against abnormal input voltages
• Output current limit and short circuit protection (auto recovery)
• Thermal shutdown
Control Features
• On/Off control referenced to input side
(positive and negative logic options are available)
Contents
Page No.
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # BQ55090ETA27
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Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Compliance & Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 1
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Open Frame Mechanical Diagram
NOTES
PIN DESIGNATIONS
1) PINS 1-3 ARE 0.040" (1.02MM) DIA. WITH 0.080"
(2.03mm) DIA. STANDOFF SHOULDERS
2) PINS 4-5, ARE 0.062" (1.57mm) DIA. WITH 0.100"
(2.54mm) DIA. STANDOFF SHOULDERS
3) OTHER PIN EXTENSION LENGTHS AVAILABLE
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.XXIN +/- 0.02 (X.Xmm +/- 0.5mm)
X.XXXIN +/- 0.010 (X.XXmm =/- 0.25mm)
7) WEIGHT: 0.7 oz. (20g) 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.
Product # BQ55090ETA27
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Pin
Name
Function
1 Vin(+) Input positive (35V - 55V)
2 ON/OFF Logic control input to turn
converter on and off
3 Vin(–) Input Negative
4 Vout(–) Output Negative
5 Vout(+) Output Positive
www.synqor.com
Doc.# 005-2BE559C Rev. F
10/01/15
Page 2
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Specification
BQ55090ETA27 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
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-On Voltage Threshold
Turn-Off 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
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 (3 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
EFFICIENCY
100% Load
50% Load
Product # BQ55090ETA27
Typ.
-1
-40
-45
-2
35
48
Max.
60
56
2000
100
125
18
V
V
V
°C
°C
V
55
V
34.3
32.0
2.4
1.5\2.0
47
V
V
V
V
V
V
A
mA
mA
A²s
mA
mA
A
µH\µF
µF
9.60
V
40/3.8
4.8/460
2/200
11.0
%\V
%\mV
%\mV
V
120
40
27
mV
mV
A
56.9
59.2
15
3.8
250
5.8
0.10
30
0.1
7.0
20
6.3
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Units Notes & Conditions
100
20
0
34
0
±10
10
A
V
3000
95.7
96.1
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Continuous
Continuous
Basic insulation, Pollution Degree 2
100% Load, 35 Vin
RMS through 10 µH inductor; Figures 12 & 14
RMS, full load; Figure 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2 Ω, see Figure 12
48 Vin, no load
Figure 4
Figure 4
Figure 4
Over sample, line, load, temperature & life
20 MHz bandwidth; Figure 12 & 15; See Note 1
Full Load; see Figures 12 & 15
Full Load; see Figures 12 & 15
Subject to thermal derating; Figures 5 & 7
Output Voltage 10% Low; Figure 16
mA
µF
% of rated output current
Negative current drawn from output
9.6 Vout at 27 A Resistive Load
%
%
Figures 1 & 3
Figures 1 & 3
Doc.# 005-2BE559C Rev. F
10/01/15
Page 3
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Specification
BQ55090ETA27 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Typ.
Max.
Units Notes & Conditions
150
200
mV
µs
50% to 75% to 50% Iout max; Figure 11
To within 1% Vout nom
1
20
0
ms
ms
%
Full load, Vout = 90% nom.; Figures 9 & 10
-40 °C to +125 °C
2,500 μF load capacitance, Iout = 0 A
Isolation Voltage (dielectric strength)
2000
V
Isolation Resistance
30
MΩ
Isolation Capacitance (input to output)²
N/A
pF
See Note 2
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
°C
Package rated to 150 °C
Board Temperature
125
°C
UL rated max operating temp 130 °C
Transformer Temperature
125
°C
See Figures 5 & 7 for derating curves
FEATURE CHARACTERISTICS
Switching Frequency
120
150
180
kHz
ON/OFF Control (Option P)
Off-State Voltage
-1.0
0.8
V
On-State Voltage
2.4
18
V
ON/OFF Control (Option N)
Off-State Voltage
2.4
18
V
On-State Voltage
-1.0
0.8
V
ON/OFF Control (Either Option)
Figure B
Pull-Up Voltage
9
V
Pull-Up Resistance
124
kΩ
Over-Temperature Shutdown
140
150
°C
Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis
10
°C
Load Current Scale Factor
1667
See App Note: Output Load Current Calc.
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
2.36
106 Hrs. TR-NWT-000332; 80% load,300 LFM, 40 oC Ta
Calculated MTBF (MIL-217) MIL-HDBK-217F
1.79
106 Hrs. MIL-HDBK-217F; 80% load, 300 LFM, 40 oC Ta
Field Demonstrated MTBF
106 Hrs. See our website for values
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Isolation capacitance can be added externally to the module.
Product # BQ55090ETA27
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 4
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Specification
Compliance & Testing
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R2011-12
Basic insulation
EN60950-1/A2:2013
CAN/CSA-C22.2 No. 60950-1/A1:2011
Note: 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.
Parameter
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # BQ55090ETA27
# Units
32
5
5
10
5
5
5
15 pins
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Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x, y and z axis
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
85 °C, 95% RH, 1000 hours, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 5
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Figures
100
Power Dissipation (W)
Efficiency (%)
95
90
85
80
35 Vin
75
70
48 Vin
55 Vin
0
3
6
9
12
15
18
21
24
27
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
35 Vin
48 Vin
55 Vin
0
3
6
9
12
15
18
21
24
27
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25 °C.
Figure 2: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25 °C.
Figure 3: Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25 °C, 40 °C, and 55 °C
(nominal input voltage).
Figure 4: Output voltage regulation vs. load current for minimum,
nominal, and maximum input voltage at 25 °C.
Semiconductor junction temperature is
within 1°C 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 1 to pin 3 (nominal input voltage).
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Figure 6: Thermal plot of converter at 27 amp load current (250 W)
with 55 °C air flowing at the rate of 200 LFM. Air is flowing across the
converter from pin 1 to pin 3 (nominal input voltage).
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 6
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Figures
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 27 amp load current (250 W)
with 55 °C 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 full load (resistive load) (1.0 ms/div).
Input voltage pre-applied. Top Trace: Vout (2 V/div). Bottom Trace:
ON/OFF input (1 V/div).
Figure 10: Turn-on transient at zero load (1.0 ms/div). Top Trace: Vout
(2 V/div). Bottom Trace: ON/OFF input (1 V/div).
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/μs). Load cap: 15 μF, 100 mF ESR tantalum cap
and 1 μF ceramic cap. Top trace: Vout (200 mV/div), Bottom trace: Iout (5 A/div)
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).
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 7
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Figures
Figure 13: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 10 μH source impedance and
47 μF electrolytic capacitor (500 mA/div). See Figure 12.
Figure 14: Input reflected ripple current, is, through a 10 μH source
inductor at nominal input voltage and rated load current (20 mA/div).
See Figure 12.
Figure 15: Output voltage ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 1 μF ceramic capacitor
and 15 μF 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 (50 A/div) as a function of time when the
converter attempts to turn on into a 1 mΩ short circuit. Top trace
(5.0 ms/div) is an expansion of the on-time portion of the bottom trace.
Figure 18: Magnitude of incremental output impedance (Zout =
vout/iout) for minimum, nominal, and maximum input voltage at full
rated power.
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 8
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Technical Figures
Figure 19: Magnitude of incremental forward transmission (FT =
vout/vin) for minimum, nominal, and maximum input voltage at full
rated power.
Figure 20: Magnitude of incremental reverse transmission (RT =
iin/iout) for minimum, nominal, and maximum input voltage at full rated
power.
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.# 005-2BE559C Rev. F
10/01/15
Page 9
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Applications Section
BASIC OPERATION AND FEATURES
CONTROL 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.
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 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.
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(+)
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: 12 V, 9 V, 7.5 V, 5 V, or 3.3 V. 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 9.6 Vout 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 with the input voltage range of the non-isolated
converters being employed.
On/Off
5V
124k
5V
49.9k
TTL
100k
Vin(-)
Figure B: Internal ON/OFF pin circuitry
The BusQor architecture is very scalable, meaning multiple bus
converters can be connected directly in parallel to allow current
sharing for higher power applications.
3.3 V
Front End
48 Vdc
35-55 V
BusQor
Converter
9.6 Vdc
2.5 V
1.8 V
1.5 V
0.9 V
Typical User Board
Converters
Loads
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter
and NiQor non-isolated converters
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 10
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Applications Section
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.
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 10 ms typical (see Figure C). The
shutdown period lasts for a typical period of 250 ms (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 3% (On) and 97%
(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
34 A
27 A
Output
Voltage
9.6 V
0V
10 ms
Time
Figure C: Output Overload protection diagram (not to scale)
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Output
Current
70 A
peak
Output
Voltage
< 9.6V
0V
Time
250 ms
10 ms
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to
scale)
Output Short Circuit Protection: When the output of the
BusQor module is shorted, a peak current of typically 34 A will
flow into the short circuit for a period of about 10 ms. The
output of the BusQor will shutdown to zero volts for the same
period (Figure E). The shutdown period lasts for a period of
250 ms, at the end of which the BusQor module tries to power
up again. If the short circuit persists, the output voltage will
go through repeat ed cycles of shutdown and restart with a
duty cycle of 3% (On) and 97% (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 48 V 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 2 A 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
Over- Temperature 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.
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Doc.# 005-2BE559C Rev. F
10/01/15
Page 11
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Applications Section
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 3 ms is initiated. The output
builds up to 90% or higher of the nominal voltage and stabilizes
at the nominal value of 9.6 V. The rise time from 0 V to 90% is
4.5 ms typical.
At time t2, when the On/Off pin is de-asserted (disabled), the
BusQor output instantly drops to 0V. Fall time from 9.6 V to 0
V 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 2.5 ms 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.
Vin
UVLO
On/Off
(N logic)
OFF
ON
t0
t1
t2
t3
Vout
t
Vout
Start-up
Inhibit
Fault Inhibit
Time
Start-Up
Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit
Period
Figure F: Keep Out Areas for BusQor module
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.
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. 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.
Product # BQ55090ETA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE559C Rev. F
10/01/15
Page 12
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Applications Section
Figure G: Location of Sense Resistor
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.
Iload = (VRsense(load) - VRsense(no load) ) x 1667
where:
Iload = output load current
VRsense(load) = voltage across the sense resistor with
converter under load
VRsense(no load) = voltage across the sense resistor with
converter at zero load
The number 1667 is a “Load Current Scale Factor” for this
product, valid only for Vin = 48 V. Hence, measurement should
be made at this input voltage. The voltage drop across the
sense resistor is about 16.2 mV at full load of 27 A. Therefore,
proper measuring techniques must be used to ensure accuracy.
A calibrated DMM set to 300 mV 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”.
+
1
Vin
2
3
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 J for details on PCB layout. Contact SynQor application
engineering for further assistance on PCB trace design.
The current share performance of two paralleled modules is
illustrated in the graph in Figure I. In this graph the percent
deviation from ideal sharing (50%) is plotted for each module
versus the total output load current at 48 Vin.
+
BusQor
module
(N logic
option)
5
9.6 Vout
54 A
4
—
BusQor module
—
1
2
3
BusQor
module
(N logic
option)
CM EMI
filter
5
(Not shown
in Figure H)
Bulk
Cap
BusQor module
4
Figure H: BusQor Output Paralleling for increased current output
Product # BQ55090ETA27
Figure I: Current share performance of 2 paralleled modules
Phone 1-888-567-9596
Input LC filters
Figure J: Recommended PCB layout for input circuit
www.synqor.com
Doc.# 005-2BE559C Rev. F
10/01/15
Page 13
Input: 35-55 V
Output: 9.6 V
Current: 27A
Package: Eighth-brick
Ordering Information
Part Numbering System
Ordering Information
The part numbering system for SynQor’s dc-dc converters follows the format
shown in the example below.
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 characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
BQ 5 5 0 9 0 E T A 2 7 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
Input Voltage
BQ55090ETw27xyz
35 - 55 V
Output
Voltage
9.6 V
Max Output
Current
27 A
Output Current
Thermal Design
Performance Level
Package Size
The following options must be included in place of the w x y z spaces in the
model numbers listed above.
Output Voltage
Input Voltage
Product Family
Thermal Design
Options Description: w x y z
Enable Logic
Pin Length
Feature Set
K - 0.110"
P - Positive *
N - 0.145"
A - Open Frame
S - Standard
N - Negative
R - 0.180"
Y - 0.250"
* Consult the factory before ordering the P logic option
The first 12 characters comprise the base part number and the last 3
characters indicate available options. The “-G” suffix indicates 6/6 RoHS
compliance.
Application Notes
A variety of application notes and technical white papers can be downloaded
in pdf format from our website.
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 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 [email protected]
Not all combinations make valid part numbers, please contact SynQor for
availability.
Contact SynQor for further information and to order:
PATENTS
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # BQ55090ETA27
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
SynQor holds numerous U.S. patents, one or more of which apply to most of its power converter
products. Any that apply to the product(s) listed in this document are identified by markings on
the product(s) or on internal components of the product(s) in accordance with U.S. patent laws.
SynQor’s patents include the following:
5,999,417
6,222,742
6,545,890
6,594,159
6,731,520
6,894,468
6,896,526
6,927,987
7,050,309
7,072,190
7,085,146
7,119,524
7,269,034
7,272,021
7,272,023
7,558,083
7,564,702
7,765,687
7,787,261
8,023,290
8,149,597
8,493,751
8,644,027
9,143,042
WARRANTY
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from SynQor.
www.synqor.com
Doc.# 005-2BE559C Rev. F
10/01/15
Page 14
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