SynQor BQ55090ETA27 Eighth-brick dc bus converter Datasheet

Technical
S pecification
BQ55090ETA27
35-55V
9.6V
27A
2000Vdc
Eighth-brick
Input
Output
Current
Isolation
DC Bus Conver ter
The BusQor® BQ55090ETA27 bus converter is a next-generation, board-mountable, isolated, fixed switching frequency
D C / D C c o n ve r t e r t h a t u s e s s y n c h r o n o u s r e c t i f i c a t i o n t o
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 48V to a 9.6V intermediate bus with no regulation
in a standard “eighth-brick” module. BusQor converters are
ideal for creating the mid-bus voltage required to drive pointof-load (non-isolated) converters in intermediate bus architectures. RoHS compliant (see page 12 ).
BQ55090ETA27 Module
Operational 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: 35V – 55V provides 6.5-11V bus
for distributed power architectures
• Fixed frequency switching provides predictable EMI performance
Mechanical Features
• Industry standard eighth-brick bus converter pin-out
• Industry standard size: 0.90” x 2.3” x .484”
(22.9x58.4x11.76mm)
• Total weight: 0.7 oz. (20 grams)
• Flanged pins designed to permit surface mount soldering (avoid wave solder) using FPiP technique
Contr ol Features
• On/Off control referenced to input side (positive and
negative logic options available)
Product # BQ55090ETA27
Phone 1-888-567-9596
Bus
Conver ter
www.synqor.com
Pr otection Features
• Input under-voltage lockout and over-voltage shutdown
protects against abnormal input voltages
• Output current limit and short circuit protection (auto
recovery)
• Output over-voltage protection
• Thermal shutdown
Safety Features
• 2000V, 30 MW 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
Doc.# 005-2BE559C Rev. B
10/10/06
Page 1
Input:
Output:
Current:
Package:
Technical Specification
MECHANICAL
DIAGRAM
35-55 V
9.6 V
27 A
Eighth-brick
2.300
0.140
(58.40)
(3.60)
0.150
(3.80)
2.000
(50.80)
Top View
0.900
(22.90)
0.300
(7.62)
0.600
(15.24)
Side View
Bottom side
Clearance
See Note 9
0.076 ±0.028
Lowest
Component
(1.93 ±0.71)
Load Board
NOTES
(4.57)
See Note 3
Flanged Pin
See Note 10
0.484 ±0.020
(12.29 ±0.50)
PIN DESIGNATIONS
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 (RoHS 5/6) - Tin/Lead over Nickel plate
Finish (RoHS 6/6) - Matte Tin over Nickel plate
5) Unmeasured 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 (allowing to avoid the wave soldering process)
through the use of the flanged pin-in-paste technique.
Product # BQ55090ETA27
0.180
Phone 1-888-567-9596
Pin No.
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. B
10/10/06
Page 2
Input:
Output:
Current:
Package:
Technical Specification
35-55 V
9.6 V
27 A
Eighth-brick
BQ55090ETA27 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc 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.
Typ.
Max.
Units
60
56
2000
100
125
18
V
V
V
°C
°C
V
55
V
Notes & Conditions
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-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
-40
-55
-2
35
34.3
32
2.4
V
V
V
59.2
56.9
V
V
A
A
mA
A 2s
mA
mA
A
µH\µF
µF
15
3.8
250
1.5\2.0
47
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
48
6.3
0
5.8
0.10
30
0.1
7.0
20
9.60
V
40/3.8
4.8/460
2/200
%\V
%\mV
%\mV
V
100
20
34
0
+10
10
11.0
120
40
27
3,000
mV
mV
A
A
V
%
mA
µF
Continuous
Continuous
Basic insulation, Pollution Degree 2
100% Load, 35 Vin
RMS through 10µH inductor; Figures 12 & 14
RMS, full load; Figures 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2W, see Figure 12
48Vin, no load
Figure 4
Figure 4
Figure 4
Over sample, line, load, temperature & life
20MHz bandwidth; Figure 12 & 15
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
% of rated output current
Negative current drawn from output
9.6Vout at 27A Resistive Load
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
EFFICIENCY
100% Load
50% Load
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 = 0A
95.7
96.1
%
%
Figures 1 & 3
Figures 1 & 3
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 & 7 for derating curves
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
125
125
125
2000
30
V
MW
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Product # BQ55090ETA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE559C Rev. B
10/10/06
Page 3
Input:
Output:
Current:
Package:
Technical Specification
35-55 V
9.6 V
27 A
Eighth-brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
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
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
Min.
Typ.
Max.
Units
120
150
180
kHz
-1.0
2.4
0.8
18
V
V
2.4
-1.0
18
0.8
V
V
140
9
124
11.6
10
1667
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
150
V
kW
V
°C
°C
Notes & Conditions
Figures A & B
Over full temp range; no load
Average PCB Temperature
See App Note: Output Load Current Calc.
10 Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta
106 Hrs. See our website for values
6
2.36
1.79
STANDARDS COMPLIANCE
Parameter P
Notes
STANDARDS COMPLIANCE
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
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
• 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
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
# Units
32
5
5
10
5
5
5
3
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in 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, 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
PATENTS
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.
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 # BQ55090ETA27
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Doc.# 005-2BE559C Rev. B
10/10/06
Page 4
Input:
Output:
Current:
Package:
Technical Specification
100
Power Dissipation (W)
Efficiency (%)
95
90
85
80
35 Vin
75
48 Vin
55 Vin
70
0
3
6
9
12
15
18
21
24
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
35 Vin
48 Vin
55 Vin
0
27
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.
98
12
11
Output Voltage (V)
97
Efficiency (%)
35-55 V
9.6 V
27 A
Eighth-brick
96
95
94
25 C
40 C
55 C
93
100
200
300
9
8
7
35V
6
48V
5
55V
4
92
0
10
0
400
5
10
15
20
25
Load Current (A)
Air Flow (LFM)
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.
25
IOUT (A)
20
15
400 LFM
10
300 LFM
200 LFM
5
100 LFM
0
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
Ambient Air Temperature (oC)
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).
Product # BQ55090ETA27
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Figure 6: Thermal plot of converter at 27 amp load current (250W)
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).
www.synqor.com
Doc.# 005-2BE559C Rev. B
10/10/06
Page 5
Input:
Output:
Current:
Package:
Technical Specification
35-55 V
9.6 V
27 A
Eighth-brick
25
IOUT (A)
20
15
400 LFM
10
300 LFM
200 LFM
5
100 LFM
0
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
o
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 27 amp load current (250W)
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 (2V/div). Bottom Trace:
ON/OFF input (1V/div).
Figure 10: Turn-on transient at zero load (1.0 ms/div). Top Trace: Vout
(2V/div). Bottom Trace: ON/OFF input (1V/div).
See Fig. 14
10 µH
source
impedance
See Fig. 13
See Fig. 15
iS
VSOURCE
iC
DC/DC
Converter
47 µF,
<1W ESR
electrolytic
capacitor
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/µ s). Load cap: 15µ F, 100 mW ESR tantalum cap
and 1µ F ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (5A/div).
Product # BQ55090ETA27
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VOUT
1 µF
15 µF,
ceramic 450mW ESR
capacitor
tantalum
capacitor
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. B
10/10/06
Page 6
Input:
Output:
Current:
Package:
Technical Specification
Figure 14: Input reflected ripple current, is, through a 10 µ H source
inductor at nominal input voltage and rated load current (20mA/div).
See Figure 12.
Output Voltage (V)
Figure 13: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10µ H source impedance and 47µ F
electrolytic capacitor (500 mA/div). See Figure 12.
35-55 V
9.6 V
27 A
Eighth-brick
12
11
10
9
8
7
6
5
4
3
2
1
0
35V
48V
55V
0
5
10
15
20
25
30
35
Load Current (A)
Figure 15: Output voltage ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 1µ F ceramic capacitor
and 15µ F 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
Output Impedance (ohms)
48 Vin
55 Vin
0.1
0.01
10
100
1,000
10,000
100,000
Hz
Figure 17: Load current (50A/div) as a function of time when the converter attempts to turn on into a 1 mW short circuit. Top trace
(5.0ms/div) is an expansion of the on-time portion of the bottom trace.
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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. B
10/10/06
Page 7
Input:
Output:
Current:
Package:
Technical Specification
35-55 V
9.6 V
27 A
Eighth-brick
10
0
0
-20
Reverse Transmission (dB)
Forward Transmission (dB)
-10
-30
-40
-50
-60
35 Vin
-70
48 Vin
-80
-10
-20
-30
35 Vin
-40
48 Vin
55 Vin
55 Vin
-50
-90
10
100
1,000
10,000
10
100,000
Hz
100
1,000
10,000
100,000
Hz
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.
10000
Input Impedance (ohms)
1000
100
10
35 Vin
1
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.
Product # BQ55090ETA27
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Doc.# 005-2BE559C Rev. B
10/10/06
Page 8
Input:
Output:
Current:
Package:
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 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.
35-55 V
9.6 V
27 A
Eighth-brick
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.
Vin+
5V
124k
On/Off
SynQor’s 9.6Vout 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.
49.9k
TTL
100k
Vin-
Figure B: Internal ON/OFF pin circuitry
3.3 V
PROTECTION FEATURES
2.5 V
48Vdc
35-55V
BusQor
9.6Vdc
Converter
1.8 V
1.5 V
0.9 V
Typical User Board
Point of Load Loads
Converters
48Vdc
Front
End
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.
Figure A: Example of Intermediate Bus Architecture using
BusQor bus converter and point of load non-isolated converters
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Doc.# 005-2BE559C Rev. B
10/10/06
Page 9
Input:
Output:
Current:
Package:
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 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 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
35-55 V
9.6 V
27 A
Eighth-brick
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 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 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.
34A
27A
Output
Voltage
9.6V
APPLICATION CONSIDERATIONS
0V
10mS
Time
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
the short circuit persists, the output voltage will go through repeatOutput
Current
70A
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 9.6V. The rise time from 0V to 90% is 4.5mS typical.
At time t2, when the On/Off pin is de-asserted (disabled), the
BusQor output instantly drops to 0V. Fall time from 9.6V 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 2.5mS typical.
Output
Voltage
Refer to the Control Features section of the data sheet for details
on enabling and disabling methods for N and P logic type modules.
9.6V
0V
Time
250mS
10mS
Figure D: Output Short Circuit and Auto-Resetting protection
diagram (not to scale)
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Doc.# 005-2BE559C Rev. B
10/10/06
Page 10
Input:
Output:
Current:
Package:
Technical Specification
35-55 V
9.6 V
27 A
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.
Vin
UVLO
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.
On/Off
(N logic)
OFF
ON
t0
t1
t2
t3
t
Vout
9.6V
2.5ms
3ms
7ms
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.
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.
Iload
= (VRsense(full load) - VRsense(no load)) * 1667
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
Figure F: Keep Out Areas for BusQor module
converter at zero load
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.
Product # BQ55090ETA27
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The number 1667 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 16.2mV at
full load of 27A. Therefore, proper measuring techniques must
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Doc.# 005-2BE559C Rev. B
10/10/06
Page 11
Input:
Output:
Current:
Package:
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 website
titled “Output Load Current Calculations”.
35-55 V
9.6 V
27 A
Eighth-brick
from ideal sharing (50%) is plotted for each module versus the
total output load current at 48Vin.
5
1
Vin
2
3
4
5
1
2
3
9.6Vout
54A
BusQor module
(N logic option)
BusQor module
(N logic option)
4
Figure H: BusQor Output Paralleling for increased current output.
Figure G: Location of Sense Resistors
BusQor module
Input capacitor: We recommend a suitable aluminum electrolytic capacitor across the input terminals of the converter, to
decouple source inductance and provide damping for the input
circuit to avoid input instability. The capacitor must have a ripple
current rating consistent with the "input terminal ripple current"
specification of the converter in order to avoid premature failure
of the capacitor. The examples below are of the recommended
type and have ripple current ratings above the converter's input
terminal ripple current rating, to provide design margin and
extend the lifetime of the capacitor.
Nichicon
CM EMI
filter
8%
Description
56uF, 100V, 460mA rms ripple current rating at
105C, 10x20mm (dia x height) package
47uF, 63V, 405 mA rms, 8x12 mm package
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 K. In this graph the percent deviation
Product # BQ55090ETA27
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Input LC filters
Figure J: Recommended PCB layout for input circuit
UPJ2A470MHD 47uF, 100V, 402mA rms ripple current rating at
105C, 12x15mm package (lower height)
Panasonic EEUFC1J470
BusQor module
Bulk
Cap
(Not shown
in Figure H)
Deviation from 50/50 Sharing (%)
Vendor
Part Number
Panasonic EEUFC2A560
48Vin
6%
4%
2%
0%
-2%
-4%
Unit 1
-6%
Unit 2
-8%
5
10
15
20
25
30
35
40
45
50
54
Total Load Current (A)
Figure K: Current share performance of 2 paralleled modules
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 [email protected].
www.synqor.com
Doc.# 005-2BE559C Rev. B
10/10/06
Page 12
Input:
Output:
Current:
Package:
Technical Specification
35-55 V
9.6 V
27 A
Eighth-brick
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s BusQor DC bus 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 3 characters for options. To
order 6/6 RoHS compliant product please add a “-G” suffix.
BQ 55 090 E T A 27 N N S
Options
(see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Model Number
Input Voltage
BQ55090ETA27 xyz
35 - 55 V
Output Max Output
Voltage
Current
9.6 V
27 A
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Output Voltage
Input Voltage
Product Family
Options Description: x y z
Enable
Logic
Pin
Feature
Length
Set
K - 0.110"
P - Positive
N - 0.145"
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. 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.
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:
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
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.
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Doc.# 005-2BE559C Rev. B
10/10/06
Page 13
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