240W [22A - 36A]

Technical
Specification
BQ55090QTA27
36-55 V
55 V
Continuous Input Transient Input
9.6 V
240 W
2000 V dc
Quarter-brick
Output
Max Power
Isolation
DC-DC Converter
The BusQor® BQ55090QTA27 bus converter is a nextgeneration, board-mountable, isolated, fixed switching
frequencydc/dc converter that uses synchronous rectification
to achieve extremely high conversion efficiency. The power
dissipated by the converter is so low that a heatsink is not
required, which saves cost, weight, height, and application
Bus
Converter
effort. The BusQor series provides an isolated step down
voltage from 48V to 12 or 9.6V intermediate bus with no
regulation in a standard “quarter-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.
Operational Features
BQ55090QTA27
Module
• High efficiency, 96 % at full rated load current at
full load
• Delivers full power with minimal derating
- no heatsink required
Control Features
• Operating input voltage range: 36-55 V dc
• On/Off control referenced to input side
• Fixed frequency switching provides predictable EMI
• Inherent current share (by droop method) for high
current and parallel applications.
• No minimum load requirement
Safety Features
Mechanical Features
•
•
•
•
•
•
•
• Industry standard quarter-brick pin-out configuration
(two or four output pin option)
• Size: 1.45” x 2.3” (36.8x58.4mm)
• Total height: 0.445” (11.3mm)
• Total weight: 1.5 oz (42 g)
Protection Features
• Input under-voltage lockout and over-voltage
shutdown protects again abnormal input voltages
• Output current limit and short circuit protection
(auto recovery)
• Output over-voltage protection
• Thermal shutdown
Product # BQ55090QTA27
Phone 1-888-567-9596
2000 V input-to-output isolation
UL 60950-1:2003
CAN/CSA-C22.2 No. 60950-1:2003
EN60950-1:2001
EN60950-1:
2001
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
RoHS compliant (see page 14)
Contents
Page No.
MECHANICAL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BQ55090QTA27 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . .3-4
.3-4
BQ55090QTA27 Standards and Qualifications.
Qualifications. . . . . . . . . . . . . . . . . . . . 5
BQ55090QTA27 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9
.6-9
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 1
36-55 V
9.6 V
27A
Quarter-brick
Input:
Output:
Current:
Package:
Technical Specification
MECHANICAL DIAGRAM
1.45 (36.8)
0.16
(4.1)
Overall Height
0.750 (19.05)
0.445+/-0.022
0.600 (15.24)
0.150 (3.81)
(11.3+/-0.55)
Bottom Side
Clearance
Top View
5
See Note 9
0.033+/-0.032
(0.84+/-0.81)
4
2.30
(58.4)
Side View
2.00
(50.8)
1
2
3
0.600 (15.24)
0.145
(3.68)
See Note 3
0.300 (7.62)
0.43 (10.8)
NOTES
1) Pins 1-3 are 0.040” (1.02mm) diameter with 0.080” (2.03 mm)
diameter standoff shoulders.
PIN DESIGNATIONS
Pin
Name
Function
2) Pins 4-5 are 0.062” (1.57 mm) diameter with 0.100” (2.54 mm)
diameter standoff shoulders.
1
Vin(+)
Positive input voltage
3) Other pin lengths available. Recommended pin length is 0.03”
(0.76mm) greater than the PCB thickness.
2
ON/OFF
4) All Pins: Material - Copper Alloy
Finish: Tin over Nickel plate
3
Vin(–)
4
Vout(–)
Negative output
5
Vout(+)
Positive output
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)
Logic control input to turn converter on
and off.
Negative input
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.
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 # BQ55090QTA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 2
Input:
Output:
Current:
Package:
Technical Specification
36-55 V
9.6 V
27A
Quarter-brick
BQ55 FAMILY 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
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
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
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse (see Note 1)
Recommended External Input Capacitance
Input Filter Component Values (C\L\C)
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
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 (with 3mF output capacitance)
Start-Up Inhibit Time
Output Voltage Overshoot
Product # BQ55090QTA27
Min.
Typ.
Max.
0
36
48
60
55
N/A
V
V
V
2000
100
125
18
V
°C
°C
V
55
V
-40
-55
-2
36
48
34.3
32
2.4
47
1\6.6
V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
µH\µF
9.6
V
40\3.8
5.2\500
2\200
%\V
%\mV
%\mV
V
59.2
56.9
15.0
10
140
8.5
110
30.0
20
20
6.550
Phone 1-888-567-9596
Units Notes & Conditions
11.000
50
20
0
90
36
48
5
10
3,000
200
100
2
200
0
www.synqor.com
3
mV
mV
A
A
V
mA
µF
Continuous
Continuous
100 ms transient, square wave
RMS through 10µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal values; see Figure E
Over sample, line, load, temperature & life
20 MHz bandwidth; see Note 2
Full load
Full load
at 7.2 Vout, 36Vin; Subject to thermal derating
36Vin, Output Voltage 10% Low
Negative current drawn from output
9.6Vout at 27 A Resistive Load
mV
µs
50% to 75% to 50% Iout max
To within 1% Vout nom
ms
ms
%
Full load, Vout=90% nom.
-40 °C to +125 °C; Figure F
3 mF load capacitance
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 3
Input:
Output:
Current:
Package:
Technical Specification
36-55 V
9.6 V
27A
Quarter-brick
BQ55 FAMILY 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.
Typ.
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance (input to output)
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Maximum Baseplate Temperature, Tb
EFFICIENCY
100% Load
50% Load
FEATURE CHARACTERISTICS
Switching Frequency
131
ON/OFF Control (Option P)
Off-State Voltage
-1
On-State Voltage
2.4
ON/OFF Controll (Option N)
Pull-Up Voltage
2.4
Pull-Up Resistance
-1
Output Over-Voltage Protection
Over-Temperature Shutdown OTP Trip Point
140
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
Calculated MTBF (MIL-217) MIL-HDBK-217F
Field Demonstrated MTBF
Max.
2000
30
470
Units Notes & Conditions
V
MΩ
pF
See Absolute Maximum Ratings
Package rated to 150 °C
UL rated max operating temp 130 °C
N/A
°C
°C
°C
°C
96
96
%
%
125
125
125
155
178
kHz
0.8
18
V
V
18
0.8
V
V
V
°C
°C
See Note 3
Application notes Figures A & B
7.5
150
10
1
TBD
Over full temp range; no load
Average PCB Temperature
106 Hrs. 80% load, 200LFM, 40 °C Ta
106 Hrs. 80% load, 200LFM, 40 °C Ta
106 Hrs. See our website for details
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
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 3: Isolation capacitance can be added external to the module.
Product # BQ55090QTA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 4
Input:
Output:
Current:
Package:
Technical Specification
36-55 V
9.6 V
27A
Quarter-brick
BQ55090QTA27 Standards and Qualifications
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:2003
CAN/CSA-C22.2 No. 60950-1:2003
EN60950-1:2001
Needle Flame Test (IEC 695-2-2)
Test on entire assembly; board & plastic components UL94V-0 compliant
IEC 61000-4-2
ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
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
# Units
Test Conditions
QUALIFICATION TESTING
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
Vibration
5
10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
Mechanical Shock
5
100g minimum, 2 drops in x and y axis, 1 drop in z axis
Temperature Cycling
10
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Power/Thermal Cycling
5
Toperating = min to max, Vin = min to max, full load, 100 cycles
Design Marginality
5
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
Humidity
5
85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day
Solderability
Product # BQ55090QTA27
15 pins
Phone 1-888-567-9596
MIL-STD-883, method 2003
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 5
Input:
Output:
Current:
Package:
Technical Specification
95
96.5
90
96.0
Efficiency (%)
97.0
Efficiency (%)
100
85
80
35 Vin
48 Vin
55 Vin
75
10
20
30
95.5
95.0
25º C
40º C
55º C
94.5
70
0
36-55 V
9.6 V
27A
Quarter-brick
94.0
40
100
Load Current (A)
200
Air Flow (LFM)
300
400
Figure 2: 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 1: Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
14
8
10
Power Dissipation (W)
Power Dissipation (W)
12
8
6
4
35 Vin
48 Vin
2
7
6
5
25º C
40º C
55º C
55 Vin
0
0
10
20
30
4
40
100
Load Current (A)
Figure 3: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
200
Air Flow (LFM)
300
400
Figure 4: Power dissipation 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).
40
Iout (A)
30
20
400 LFM (2.0 m/s)
10
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
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 curve 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 # BQ55090QTA27
Phone 1-888-567-9596
Figure 6: Thermal plot of converter at 30 A load current (268 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).
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 6
Input:
Output:
Current:
Package:
Technical Specification
36-55 V
9.6 V
27A
Quarter-brick
40
Iout (A)
30
20
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0
25
40
55
70
85
Semiconductor junction temperature is
within 1°C of surface temperature
Ambient Air Temperature (ºC)
Figure 7: Maximum output power derating curves vs. ambient air
temperature for airflow rates of 100 LFM through 400 LFM with air
flowing across the converter from output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 30 A load current (268 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 ms/div). Load
cap: 3 mF output capacitance. Input voltage pre-applied. Ch 1: Vout (5 V/
div), Ch 2: ON/OFF input (2 V/div).
Figure 10: Turn-on transient at zero load (1 ms/div). Load cap: 3 mF
output capacitance. Ch 1: Vout (5 mV/div), Ch 2: ON/OFF input (2 V/div).
Figure 11: Output voltage response to step-change in load current (50%75%-50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF tantalum cap
and 1µF ceramic cap. Ch 1: Vout (200mV/div), Ch 2: Iout (10A/div).
Figure 12: Output voltage response to step-change in load current (50%75%-50% of Iout(max): dI/dt = 1A/µs). Load cap: 470µF, 30 mΩ ESR
tantalum cap and 1µF ceramic cap. Ch 1: Vout (200mV/div), Ch 2: Iout
(10A/div).
Product # BQ55090QTA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 7
Input:
Output:
Current:
Package:
Technical Specification
See
Fig. 15
10 µH
source
impedance
See
Fig. 14
iS
VSOURCE
iC
47 µF,
<1W ESR
<1
electrolytic
capacitor
36-55 V
9.6 V
27A
Quarter-brick
See
Fig. 16
DC-DC
Converter
VOUT
1 µF
15 µF,
ceramic 450mW
450mW ESR
capacitor
tantalum
capacitor
Figure 13: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 14), Input Reflected Ripple Current
(Figure 15) and Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, ic, at full rated output current
and nominal input voltage with 10µH source impedance and 47µF
electrolytic capacitor (200 mA/div). See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10 µH source
inductor, using a 47µF electrolytic input capacitor (20 mA/div). See Figure
13.
Figure 16: Output voltage ripple at nominal input voltage and rated load
current (50 mV/div). Load capacitance: 1µF ceramic capacitor and 15µF
tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
Figure 17: Output voltage response to step-change in input voltage (48V to
55V), at rated load current. Load cap: 15µF tantalum capacitor and 1uF
ceramic cap. Ch 1: Vout (5 V/div), Ch 2: Vin (20V/div).
Figure 18: 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 (10 ms/div) is an
expansionof the on-time portion of the bottom trace.
Product # BQ55090QTA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 8
Input:
Output:
Current:
Package:
Technical Specification
0
Forward Transmission (dB)
Output Impedance (ohms)
1
36-55 V
9.6 V
27A
Quarter-brick
0.1
-10
0.01
-20
35 Vin
0.001
-30
48 Vin
35 Vin
48 Vin
55 Vin
55 Vin
0.0001
-40
10
100
1,000
10,000
Hz
100,000
10
100
1,000
10,000
100,000
Hz
Figure 19: Magnitude of incremental output impedance (Zout = Vout/Iout)
for minimum, nominal, and maximum input voltage at full rated power.
Figure 20: Magnitude of incremental forward transmission (FT = Vout/Vin)
for minimum, nominal, and maximum input voltage at full rated power.
1000
5
Input Impedance (ohms)
Reverse Transmission (dB)
-5
-15
-25
-35
35 Vin
-45
100
10
35 Vin
1
48 Vin
48 Vin
55 Vin
55 Vin
0.1
-55
10
100
1,000
10
100,000
10,000
100
1,000
Hz
10,000
100,000
Hz
Figure 21: Magnitude of incremental reverse transmission (RT = Iin/Iout)
for minimum, nominal, and maximum input voltage at full rated power.
Figure 22: Magnitude of incremental input impedance (Zin = Vin/Iin) for
minimum, nominal, and maximum input voltage at full rated power.
12
Output Voltage (V)
10
8
6
4
35 Vin
2
48 Vin
55 Vin
0
0
10
20
Load Current (A)
30
40
Figure 23: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
Product # BQ55090QTA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 9
Input:
Output:
Current:
Package:
Technical Specification
36-55 V
9.6 V
27A
Quarter-brick
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 nonisolated 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+
124k
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 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.
The BusQor architecture is very scalable, meaning multiple bus
converters can be connected directly in parallel to allow current
sharing for higher power applications.
Typical User Board
3.3 V
2.5 V
48Vdc
42-53V
48Vdc
Front
End
BusQor
Converter
9.6Vdc
1.8 V
1.5 V
0.9 V
Ni
NiQor
Loads
Converters
Figure A: Example of Intermediate Bus Architecture using BusQor bus
converter and NiQor non-isolated converters
Product # BQ55090QTA27
Phone 1-888-567-9596
5V
On/Off
49.9k
TTL
100k
Vin-
Figure B: Internal ON/OFF pin circuitry
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 1ms typical (see Figure C). The shutdown
period lasts for a typical period of 200 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 20 ms (On) and 200 ms (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.
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 10
36-55 V
9.6 V
27A
Quarter-brick
Input:
Output:
Current:
Package:
Technical Specification
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.
Output
Current
33A
27A
Output
Voltage
APPLICATION CONSIDERATIONS
9.6V
0V
1ms
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 95 A will
flow into the short circuit for a period of about 20ms. The output
of the BusQor will shutdown to zero volts for the same period
(Figure E). The shutdown period lasts for a period of 200ms, 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
20ms (On) and 200ms (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 cop- per
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 100mA typical. See Figure 18 for appropriate
waveform.
Output
Current
95A peak
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 9.6 V in a period of 3.6ms typical. The
rise time from 0V to 90% is 600µs typical (with 3mF external
output capacitance at no load). 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. 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
Output
Voltage
t0
t1
t2
t
t3
Vout
<9.6V
9.6V
0V
220ms
20ms
2.5ms
Time
Figure D: Output Short Circuit and Auto-Resetting protection diagram
(not to scale)
Product # BQ55090QTA27
Phone 1-888-567-9596
3ms
Time
3.1ms
Figure E: Power Up/Down Diagram (not to scale) showing Start-Up
Inhibit Period.
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 11
Input:
Output:
Current:
Package:
Technical Specification
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.
36-55 V
9.6 V
27A
Quarter-brick
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 833
where:
Iload = output load current
0.01”
VRsense(load) = voltage across the sense resistor with
converter under load
VRsense(no load) = voltage across the sense resistor with
converter at zero load
0.023”
Bridging
Capacitor
0.01”
1.50”
Primary
Secondary
Figure F: Keep Out Areas for BusQor module
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 # BQ55090QTA27
Phone 1-888-567-9596
Figure G: Location of Sense Resistors
The number 833 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 32.4mV at full load of 27A. 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
web site titled “Output Load Current Calculations”.
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
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/110
Page 12
Input:
Output:
Current:
Package:
Technical Specification
1
5
BusQor module
(N logic option)
Vin
36-55 V
9.6 V
27A
Quarter-brick
9Vout
50A
2
3
4
1
5
BusQor module
(N logic option)
2
3
4
Figure H: BusQor Output Paralleling for increased current output.
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
48Vin
BusQor module
CM EMI
filter
(Not shown
in Figure H)
Bulk
Cap
BusQor module
Input LC filters
Figure J: Recommended PCB layout for input circuit
Figure I: Current share performance of 2 paralleled modules
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 48Vin.
Product # BQ55090QTA27
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 13
Input:
Output:
Current:
Package:
Technical Specification
36-55 V
9.6 V
27A
Quarter-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 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant.
BQ 5 5 09 0 Q T A 2 7 N N S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Thermal Design
Performance Level
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
BQ55090QTA27xyz-G
BQ55090QTA27
-G
36-55 V
9.6 V
27A
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Package Size
Output Voltage
Input Voltage
Options Description: x y z
Product Family
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 the product is 6/6 RoHS compliant.
PATENTS
SynQor holds the following U.S. patents, one or more of which apply
to each product listed in this document. Additional patent applications
may be pending or filed in the future.
5,999,417
6,222,742
6,545,890
6,577,109
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
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # BQ55090QTA27
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
Enable Logic*
Pin Length
Feature Set
P - Positive
N - Negative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Auto Recovery
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 available as 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]
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.
www.synqor.com
Doc.# 005-2BQ559J Rev. E
09/24/11
Page 14
Similar pages