Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 1
Technical
Specification
SQ60120QPA28
The BusQor® SQ60120QPA28 bus converter is a
next-generation, board-mountable, isolated, fixed switch-
ing frequency dc-dc converter that uses synchronous rec-
tification to achieve extremely high conversion efficiency.
The power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight, height,
and application effort. The SQ BusQor series provides an
isolated step down voltage from 48 V to a semi-regulated
12 V intermediate bus. BusQor converters are ideal for
customers who need multiple outputs and wish to build
or buy point of load converters to work with a 12 V rail.
RoHS Compliant (see last page).
SQ60120QPA28 Module
Bus
Converter
36-75 V 12 V 336 W 2000 Vdc Quarter-brick
Input Output Power Isolation DC Bus Converter
•Ultra-highefficiency,95%atfullratedloadcurrent
•Deliversupto28A(336W)ofoutputcurrent(power)
with minimal derating - no heatsink required
•Inputvoltagerange:36–75V
•FixedfrequencyswitchingprovidespredictableEMIper-
formance
Operational Features
•On/Offcontrolreferencedtoinputside
Control Features
•Industrystandardquarter-brickbusconverterpin-out
(“S”FeatureSet)
•Industrystandardsize:1.45"x2.3"(36.8x58.4mm)
•Totalheightonly0.483"(12.27mm),permitsbetter
airflow and smaller card pitch
•Totalweight:1.5oz.(42grams)
Mechanical Features
•2000V,30MW input-to-output isolation
•UL/cUL60950-1recognized(US&Canada),basic
insulation rating
•TUVcertifiedtoEN60950-1
•Meets72/23/EECand93/68/EECdirectives
•MeetsUL94V-0flammabilityrequirements
Safety Features
•Inputunder-voltagelockoutandover-voltage
shutdown protects against abnormal input voltages
•Outputcurrentlimitandshortcircuitprotection
•Outputover-voltageprotection
•Thermalshutdown
Protection Features
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 2
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
MECHANICAL
DIAGRAM
Top View
Side View
NOTES
1)Pins1-3are0.040”(1.02mm)diameterwith0.080”(2.03mm)
diameter standoff shoulders.
2)Pins4-7are0.062”(1.57mm)diameterwith0.100”(2.54mm)
diameter standoff shoulders.
3)Otherpinlengthsavailable.Recommendedpinlengthis0.03”
(0.76mm)greaterthanthePCBthickness.
4)AllPins: Material-CopperAlloy
Finish(RoHS6/6)-MatteTinoverNickelplate
5)Undimensionedcomponentsareshownforvisualreferenceonly.
6) All dimensions in inches (mm)
Tolerances: x.xx+/-0.02in.(x.x+/-0.5mm)
x.xxx+/-0.010in.(x.xx+/-0.25mm)
7)Weight:1.5oz.(42g)typical
8)Workmanship:MeetsorexceedsIPC-A-610CClassII
9)
UL/TUVstandardsrequireaclearanceof0.04”(1.02mm)
around primary areas of the module.
PinNo. Name Function
1 Vin(+) InputPositive(36V-75V)
2 ON/OFF Logiccontrolinputtoturn
converter on and off.
3 Vin(-) InputNegative
4 Vout(+) Output Positive
5 Vout(-) OutputNegative
6 Vout(+) OutputPositive
7 Vout(-) Output Negative
Pins in Italics Shaded text are Optional
PINDESIGNATIONS
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 3
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
Parameter
Min. Typ. Max. Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
InputVoltage
Non-Operating 0 100 V Continuous
Operating 36 48 75 V Continuous
OperatingTransientProtection 100 V 100ms
IsolationVoltage(inputtooutput) 2000 V Basicinsulation,PollutionDegree2
OperatingTemperature -40 100
°C
StorageTemperature -55 125
°C
VoltageatON/OFFinputpin -2 18 V
INPUT CHARACTERISTICS
OperatingInputVoltageRange 36 48 75 V
InputUnder-VoltageLockout
Turn-OnVoltageThreshold 31 34 V
Turn-OffVoltageThreshold 28 32 V
LockoutVoltageHysteresis 2 4 V
InputOver-VoltageShutdown
Turn-OffVoltageThreshold 105 V Vinwhenunitwillshutdown
Turn-OnVoltageThreshold 95 V Vinwhenunitturnsonaftershutdownevent
MaximumInputCurrent 12 A 100%Load,35Vin
No-LoadInputCurrent 130 mA
DisabledInputCurrent 8.5 mA
InputReflected-RippleCurrent 7.5 14.0 mA RMSthrough10
µHinductor;Figures12&14
InputTerminal-RippleCurrent 600 1000 mA RMS,fullload;
Figures12&1
RecommendedInputFuse1 15 A Fastblowexternalfuserecommended
InputFilterComponentValues(C\L) 6.6\0.22
µF\µH Internalvalues
RecommendedExternalInputCapacitance 47
µF TypicalESR0.1-0.2
W
;seeFigure12
OUTPUT CHARACTERISTICS
OutputVoltageSetPoint 12.35 V 48Vin,noload
OutputVoltageRegulation
OverLine +0.48\-1.8 V Figure4
OverLoad +0\-0.6 V Figure4
OverTemperature ±300 mV Figure4
TotalOutputVoltageRange 10.6 12.7 V Oversample,line,load,temperature&life
OutputVoltageRippleandNoise2 20MHzbandwidth;Figures
12
&15
Peak-to-Peak 150 300 mV FullLoad;seeFigures
12
&15
RMS 40 100 mV FullLoad;seeFigures
12
&15
OperatingOutputCurrentRange 0 28 A Subjecttothermalderating;Figures5-8
OutputDCCurrent-LimitInception 35 A OutputVoltage10%Low;Figure16
OutputDCCurrent-LimitShutdownVoltage 7 V
Back-DriveCurrentLimitwhileDisabled 50 mA Negativecurrentdrawnfromoutput
MaximumOutputCapacitance 3,000 µF 12Voutat28AResistiveLoad
DYNAMIC CHARACTERISTICS
OutputVoltageduringLoadCurrentTransient
ForaStepChangeinOutputCurrent(0.1A/µs) 1500 2250 mV 50%to75%to50%Ioutmax;Figure11
SettlingTime 250 350 µs Towithin1%Voutnom
Turn-OnTransient
Turn-OnTime 8 10 ms Fullload,Vout=90%nom.;Figures9&10
Start-UpInhibitTime 200 ms -40°Cto+125°C;FigureE
OutputVoltageOvershoot 0 % 3mFloadcapacitance,Iout=0A
EFFICIENCY
100%Load 95 % Figure1
50%Load 95 % Figure1
TEMPERATURE LIMITS FOR POWER DERATING CURVES
SemiconductorJunctionTemperature 125 °C Packageratedto150°C
BoardTemperature 125 °C ULratedmaxoperatingtemp130°C
TransformerTemperature 125 °C SeeFigures
5-8
for derating curves
ISOLATION CHARACTERISTICS
IsolationVoltage(dielectricstrength) 2000 V
IsolationResistance 30 M
W
IsolationCapacitance
3
470 pF
SQ60120QPA28ELECTRICALCHARACTERISTICS
TA=25°C,airflowrate=300LFM,Vin=48Vdcunless otherwisenoted;fulloperatingtemperaturerangeis-40°Cto+100°C ambient
temperature with appropriate power derating.
Specificationssubjecttochangewithoutnotice.
Note1:UL’sproductcertificationtestswerecarriedoutusing15Afastblowfuse.Fuseinterruptioncharacteristicshavetobetakenintoaccountwhile
designinginputtraces.UsershouldensurethatInputtraceiscapableofwithstandingfaultcurrentsuntilfuseblows.
Note2:Forapplicationsrequiringreducedoutputvoltagerippleandnoise,consultSynQorapplicationssupport(e-mail:support@synqor.com)
Note3:Highervaluesofisolationcapacitancecanbeaddedexternaltothemodule.
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 4
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
Parameter
P Min. Typ. Max. Units Notes & Conditions
FEATURE CHARACTERISTICS
SwitchingFrequency 260 300 340 kHz
ON/OFFControl(OptionP) FigureB
Off-StateVoltage -1.0 0.8 V
On-StateVoltage 2.4 18 V
ON/OFFControl(OptionN) FigureB
Off-StateVoltage 2.4 18 V
On-StateVoltage -1.0 0.8 V
OutputOver-VoltageProtection 16 V Overfulltemprange;noload
Over-TemperatureShutdown 140 150 °C AveragePCBTemperature
Over-TemperatureShutdownRestartHysteresis 10 °C
RELIABILITY CHARACTERISTICS
CalculatedMTBF(Telcordia) 2.6 106 Hrs. TR-NWT-000332;80%load,300LFM,40oC Ta
CalculatedMTBF(MIL-217) 2.1 106 Hrs. MIL-HDBK-217F;80%load,300LFM,40oC Ta
FieldDemonstratedMTBF 106 Hrs. See our website for details
STANDARDSCOMPLIANCE
Parameter
P Notes
STANDARDS COMPLIANCE
UL/cUL60950-1 File#E194341,Basicinsulation&pollutiondegree2
EN60950-1 CertifiedbyTUV
72/23/EEC
93/68/EEC
NeedleFlameTest(IEC695-2-2) Testonentireassembly;board&plasticcomponentsUL94V-0compliant
IEC61000-4-2 ESDtest,8kV-NP,15kVair-NP(NormalPerformance)
GR-1089-CORE Section7-electricalsafety,Section9-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.
QUALIFICATIONTESTING
Parameter
P # Units Test Conditions
QUALIFICATION TESTING
LifeTest 32 95%ratedVin and load, units at derating point, 1000 hours
Vibration 5 10-55Hzsweep,0.060”totalexcursion,1min./sweep,120sweepsfor3axis
MechanicalShock 5 100gminimum,2dropsinxandyaxis,1dropinzaxis
TemperatureCycling 10 -40°Cto100°C,unittemp.ramp15°C/min.,500cycles
Power/ThermalCycling 5 Toperating=mintomax,Vin=mintomax,fullload,100cycles
DesignMarginality 5 Tmin-10°C to Tmax+10°C,5°Csteps,Vin=mintomax,0-105%load
Humidity 5 85°C,85%RH,1000hours,2minutesonand6hoursoff
Solderability 15pins MIL-STD-883,method2003andJESD22-B102D
•
ExtensivecharacterizationtestingofallSynQorproductsandmanufacturingprocessesisperformedtoensurethatwe
supply robust, reliable product. Contact the factory for official product family qualification documents.
ELECTRICALCHARACTERISTICS(Continued)
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 5
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
70
75
80
85
90
95
100
0 4 8 12 16 20 24 28
Load Current (A)
Efficiency (%)
36 Vin
48 Vin
75 Vin
0
5
10
15
20
25
30
04812 16 20 24 28
Load Current (A)
Power Dissipation (W)
36 Vin
48 Vin
75 Vin
Figure 2: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
91
92
93
94
95
96
97
100 200 300 400
Air Flow (LFM)
Efficiency (%)
25 ºC
40 ºC
55 ºC
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).
7
8
9
10
11
12
13
14
0 4 8 12 16 20 24 28
Load Current (A)
Output Voltage (V)
36V
48V
75V
Figure 4: Output voltage regulation vs. load current for minimum,
nominal, and maximum input voltage at 25
°
C.
0
5
10
15
20
25
30
25 40 55 70 85
Ambient Air Temperature (°C)
Iout (A)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from pin 3 to pin 1 (nominal input voltage).
Figure 6: Thermal plot of converter at 23.3 amp load current (279.6W)
with 55
°
C air flowing at the rate of 200 LFM. Air is flowing across the
converter from pin 3 to pin 1 (nominal input voltage).
Figure 1: Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25
°
C.
Semiconductor junction temperature is
within 1
°
C of surface temperature
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 6
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
0
5
10
15
20
25
30
25 35 45 55 65 75 85
Ambient Air Tem perature (oC)
IOUT (A)
400
300
200
100
Figure 7: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 21.9 amp load current (262.8W)
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 half load (resistive load) and 3mF out-
put capacitance (2.0 ms/div). Input voltage pre-applied. Channel 1:
Vout (5V/div). Channel 2: ON/OFF input (2V/div).
Figure 10: Turn-on transient at zero load and 3mF output capaci-
tance (2.0ms/div). Input voltage pre-applied. Channel 1: Vout (5V/div).
Channel 2: ON/OFF input (2V/div).
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: 100
µ
F, 100 m
W
ESR tantalum cap. Top trace: Vout (2V/div), Bottom trace: Iout (10A/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).
Semiconductor junction temperature is
within 1
°
C of surface temperature
10
µ
H
source
impedance
DC-DC
Converter
See Fig. 14
See Fig. 13
See Fig. 15
1
µ
F
ceramic
capacitor
15
µ
F,
450m
W
ESR
tantalum
capacitor
47
µ
F,
<1
W
ESR
electrolytic
capacitor
VSOURCE
iSiCVOUT
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 7
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
Figure 13: Input Terminal Ripple Current, ic, at full rated output cur-
rent and nominal input voltage with 5
µ
H source impedance and 47
µ
F
electrolytic capacitor (500mA/div). See Figure 12.
Figure 14: Input reflected ripple current, is, through a 5
µ
H source
inductor at nominal input voltage and rated load current (10mA/div).
See Figure 12.
Figure 15: Output voltage ripple at nominal input voltage and rated
load current (50mV/div). Load capacitance: 1
µ
F ceramic capacitor and
15
µ
F tantalum capacitor. Bandwidth: 20MHz. See Figure 12.
0
2
4
6
8
10
12
14
0 5 10 15 20 25 30 35 40 45
Load Current (A)
Output Voltage (V)
35 Vin
48 Vin
75 Vin
Figure 16: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
Figure 17: Load current (10A/div) as a function of time when the con-
verter attempts to turn on into a 1m
W
short circuit. Top trace (500
µ
s/
div) is an expansion of the on-time portion of the bottom trace.
0.01
0.1
1
10 100 1,000 10,000 100,000 1,000,000
Hz
Output Impedance (ohms)
36V 28A
48V 28A
75V 28A
Figure 18: Magnitude of incremental output impedance (Zout = vout/
iout) for minimum, nominal, and maximum input voltage at full rated
power.
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 8
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000 1,000,000
Hz
Forward Transmission (dB)
36V 28A
48V 28A
75V 28A
Figure 19: Magnitude of incremental forward transmission (FT = vout/
vin) for minimum, nominal, and maximum input voltage at full rated
power.
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000 1,000,000
Hz
Reverse Transmission (dB)
35 Vin
48 Vin
55 Vin
Figure 20: Magnitude of incremental reverse transmission (RT = iin/
iout) for minimum, nominal, and maximum input voltage at full rated
power.
0.1
1
10
100
1000
10 100 1,000 10,000 100,000 1,000,000
Hz
Input Impedance (ohms)
35 Vin
48 Vin
55 Vin
Figure 21: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input
voltage at full rated power.
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 9
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
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 sys tems requiring multiple low voltages. IBA systems
separate the role of is olation and voltage sc aling from reg ulation
and sensing. The BusQ or series bus converter provi des isolation
and a coarse voltage step down in one compact module, leaving
regulation to si mpler, less expensive non-isolated converte rs.
In Figure A below, the BusQor module provides the isolation stage
of the IBA system. The isola ted bus then di stributes powe r to the
non-isolated buck regulato rs to generate the required v oltage lev-
els 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, signifi-
cant savings can be achieved in board space and overall system
costs.
When designing an IBA syst em with bus converters, the d esigner
can select from a variety of bus voltages. While there is no univer-
sally ideal bus v oltage, most designs employ on e of the following:
12V, 9V , 7. 5V, 5V , o r 3 .3V. H igh er bus v olta ges can l ead t o
lower efficiency for the buck regulators but are more efficient for
the bus converter and provide lower board level distribution cur-
rent. Low er bus voltages offer the opposite trade offs.
SynQor’s SQ BusQor modules accept the full 48/60V telecom
bus voltage and have a narrow output voltage range compatible
with many non-isolated point of load converters. When used in
IBA systems, the output variation of the BusQor must be in accor-
dance with the input voltage range of the non-isolated converters
being empl oyed.
3.3 V
2.5 V
48Vdc
42-53V 1.8 V
1.5 V
0.9 V
Loads
Typical User Board
48Vdc
Front
End
Figure A: Example of Intermediate Bus Architecture using
BusQor bus converter and NiQor non-isolated converters
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 converte r on). In the negative logic
version, the ON/OFF signal is acti ve low (meaning that a l ow
turns the converter on). Figure B is a detailed look o f the internal
ON/OFF circuitry.
Vin+ +5V 5V
124k
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” available on the
SynQor website. The lockout circuitry is a comparator with DC
12Vdc
BusQor
Converter hysteresis. When the input voltage is rising, it must exceed the
typical Turn-On Voltage Threshold value (listed on the specifica-
tion 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.
NiQor
Converters 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 of the BusQor
will shutdow n to ze ro volts afte r the 1 ms hav e elaps ed (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
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 10
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
Output
Current
40A
28A
Output
Voltage
12V
0V
1 ms
Figure C: Output Overload protection diagram (not to scale)
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 opera tion once the overload
is removed. The BusQor is designe d to surv ive i n this mode
indefinitely without damage and without human intervention.
Output Short Circuit Protection: When the output
of the B usQor module is shorte d, a peak current of typically 40 A
will flow into the short circuit for a time of about 1 ms. The output of
the BusQor will shutdown to zero volts after the 1 ms have elapsed
(Figure D). The shutdown period lasts for a time of 200 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 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 short circuit is removed.
The BusQor is designed to survive in this mode indefinitely without
damage and without human intervention.
In the Auto reset ting 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 ex ternal fault. It is important that copper traces
and pads from the output circuit be designed to withstand the short
term peaks, alth ough the average current into t he fault may be as
low as 50 mA typical. See Figure 17 for appropriate waveform.
Output
Current 40A peak
Time
Output
Voltage
<12V
0V Time
220 ms 20 ms
Figure D: Output Short Circuit and Auto-Resetting protection
diagram (not to scale)
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 11
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
Over-Temper ature Shutdo wn: A temperature sensor on the
converter senses the average temperature of the module. The ther-
mal shutdown circuit is designed to turn the converter off when the
temperature at the sensed location reaches the Over-Temperature
Shutdown val ue. It will al low the converter to turn on again w hen
the temperat ure of the sensed location falls b y the amount of the
Over-Temperature Shutdown Restart Hysteresis value.
Vin
UVLO
On/Off
(N logic)
OFF
ON t0
Vout
12V
200 ms
12 ms
Figure E: Power Up/Down Diagram (not to scale) showing
Start-Up Inhibit Period.
APPLICATION CONSIDERATIONS
Start-Up Inhi bit Per iod: Figure E details the Start-Up Inhibit
Period for the BusQor modulewhen Vin is applied with the On/
Off pin asserted (enabled). Before time t 1, when the input voltage
is below the UVL threshold, the unit is disabled by the Input Under-
Voltage Lockout feature. When the input voltage ris es above the
UVL threshold, the Input Under-Voltage Lockout is released, and a
typical Startup Inhibit Period of 8 ms from a Vin start-up. Once
the module recognizes it should b e on it waits an addi tional 4 ms
before it starts. When starting from an on/off event the module
has an inhibit time of 200 ms li ke our standard products. The
output builds up to 90% or higher of the nominal v oltage an d
stabilizes to its nominal output voltage in a tot al time of 8 ms
typical. The the module has a Vout rise time of 4 ms typically.
At time t2, w hen the On/Off pi n is de-assert ed (disabled ), the
BusQor module stops switching immediately. Fall time from 12 V to 0
V is dependent on output capacitance load current, and any parasitic
trace inductance in the output load circuit.
tt1t2t3At time t3, when the On/Off pin is re-asserted (enabled), the
BusQor module output begins to build up after the inhibit period
of 200 ms typical.
Refer to the Control Features section of the data sheet for details on
enabling and disabling metho ds for N and P logic type modules.
Time
208 ms
Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. A 08/21/08 Page 12
Input:
Output:
Current:
Package:
36-75 V
12 V
28 A
Quarter-brick
Technical Specification
PART NUMBERING SYSTEM
ThepartnumberingsystemforSynQor’sBusQorDCbuscon-
verters follows the format shown in the example below.
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,
themostcommonoptionsarenegativelogicand0.145”pins.
These part numbers are more likely to be readily available in
stockforevaluation andprototypequantities. A“-G” suffix
indicatestheproductis6/6RoHScompliant.
PATENTS
SynQor holds the following patents, one or more of which
mightapplytothisproduct:
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
ORDERING INFORMATION
The tables below show the valid model numbers and ordering
optionsforconvertersinthisproductfamily.Whenordering
SynQor converters, please ensure that you use the complete
15characterpartnumberconsistingofthe12characterbase
part number and the additional 3 characters for options.
A“-G”suffixindicatestheproductis6/6RoHScompliant.
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
RoHS Compliance:TheEUledRoHS(RestrictionofHazardous
Substances)DirectivebanstheuseofLead,Cadmium,Hexavalent
Chromium, Mercury, Polybrominated Biphenyls (PBB), and
PolybrominatedDiphenylEther(PBDE)inElectricalandElectronic
Equipment. This SynQor product is available as 6/6 RoHS
compliant.FormoreinformationpleaserefertoSynQor’sRoHS
addendum available at our RoHS Compliance / Lead Free
Initiativewebpageore-mailusatrohs@synqor.com.
Warranty
SynQoroffersathree(3)yearlimitedwarranty.Completewarranty
information is listed on our website or is available upon request from
SynQor.
InformationfurnishedbySynQorisbelievedtobeaccurateandreliable.
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
fromitsuse.Nolicenseisgrantedbyimplicationorotherwiseunderany
patent or patent rights of SynQor.
Contact SynQor for further information:
Phone: 978-849-0600
TollFree: 888-567-9596
Fax: 978-849-0602
E-mail: power@synqor.com
Web: www.synqor.com
Address: 155SwansonRoad
Boxborough,MA01719
USA
SQ 60 120 Q P A 28 N N S - G
ProductFamily
PackageSize
PerformanceLevel
ThermalDesign
OutputCurrent
6/6RoHS
Options (see
OrderingInformation)
InputVoltage
OutputVoltage
Options Description: x y z
Enable Logic* Pin Length Feature Set
P - Positive
N - Negative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
2 Pin
4 - Two sets of
Output Pins
