Technical
Specification
PQ60050QGA20
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 1
The PQ60050QGA20 PowerQor® Giga quarter‑brick
converter is a next‑generation, 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 low that a
heatsink is not required, which saves cost, weight,
height, and application effort. All of the power and
control components are mounted to the multi‑layer
PCB substrate with high‑yield surface mount technology.
Since the PowerQor converter has no explicit
thermal connections, it is extremely reliable.
PQ60050QGA20 Module
• Highefficiency,>89%atfullratedloadcurrent
• Deliversupto20Aofoutputcurrent(100W)with
minimal derating ‑ no heatsink required
• Wideinputvoltagerange:35V–75V,with100V100ms
input voltage transient withstand
• Fixedfrequencyswitchingprovidespredictable
EMI performance
• Nominimumloadrequirementmeansnopreload
resistors required
• SeetheBaseplate Addendum web page for more options.
Operational Features
• Inputunder-voltagelockoutdisablesconverteratlow
input voltage conditions
• Outputcurrentlimitandshortcircuitprotectionprotects
converter from excessive load current or short circuits
• Outputover-voltageprotectionprotectsloadfrom
damaging voltages
• Thermalshutdownprotectsconverterfromabnormal
environmental conditions
Protection Features
• 2000V,10MΩinput-to-outputisolationprovidesinput/
output ground separation
• UL/cUL60950-1recognized(US&Canada),basic
insulation rating
• TUVcertifiedtoEN60950-1
• Meets72/23/EECand93/68/EECdirectiveswhich
facilitates CE Marking in user’s end product
• BoardandplasticcomponentsmeetUL94V-0
flammability requirements
Safety Features
• Industrystandardquarter-brickpin-outconfiguration
• Industrystandardsize:1.45”x2.3”
• Totalheightlessthan0.40”,permitsbetterairflowand
smaller card pitch
• Totalweight:1.2oz(34g),lowermassgreatlyreduces
vibration and shock problems
Mechanical Features
• On/Offcontrolreferencedtoinputside(positiveand
negativelogicoptionsareavailable)
• Remotesensefortheoutputvoltagecompensatesfor
output distribution drops
• Outputvoltagetrimpermitscustomvoltagesand
voltage margining
Control Features
48 V 5.0 V 20 A 2000 V dc Quarther-brick
Input Output Current Isolation DC-DC Converter
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 2
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
NOTES
1)Pins1-3,5-7are0.040"(1.02mm)diameterwith
0.080"(2.03mm)diameterstandoffshoulders.
2)Pins4and8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"(0.76mm)greaterthanthePCBthickness.
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.xx+/-0.02in.(x.x+/-0.5mm)
x.xxx+/-0.010in.(x.xx+/-0.25mm)
7)Weight:1.2oz(34g)typical
8)Workmanship:MeetsorexceedsIPC-A-610CClassII
9)
UL/TUVstandardsrequireaclearancegreaterthan0.04"
(1.02mm)betweeninputandoutputforBasicinsulation.This
issue should be considered if any copper traces are on the top
sideoftheuser’sboard.Notethattheferritecoresarecon‑
sidered part of the input/primary circuit.
10)
See the B aseplate Addendum for more options.
PinNo. Name Function
1 Vin(+) Positiveinputvoltage
2 ON/OFF TTLinputtoturnconverter
on and off, referenced to
Vin(-),withinternalpullup.
3 Vin(-) Negativeinputvoltage
4 Vout(-) Negativeoutputvoltage
5 SENSE(-) Negativeremotesense1
6 TRIM Outputvoltagetrim2
7 SENSE(+) Positiveremotesense3
8 Vout(+) Positiveoutputvoltage
Notes:
1.Pin5mustbeconnectedtoVout(-).
2.LeavePin6openfornominaloutputvoltage.
3.Pin7mustbeconnectedtoVout(+).
PINCONNECTIONS
MECHANICAL DIAGRAM
0.40
(10.2)
0.145
(3.68)
See Note 3
Top View
Side View
Max. Height
Bottom side Clearance
See Note 9
2.00 (50.8)
2.30 (58.4)
0.43
(10.9)
0.300
(7.62)
0.600
(15.24)
1.45
(36.8)
0.150
(3.81)0.300
(7.62)
0.450
(11.43) 0.600
(15.24)
1
2
34
7
5
8
6
0.14 (3.6)
0.063+/-0.026
(1.60+/-0.66)
Load Board
Lowest
Component
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 3
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
PQ60050QGA20 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 Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating 100 V continuous
Operating 80 V continuous
Operating Transient Protection
100 V
100
ms transient
Isolation Voltage (input to output) 2000 V Basic level, Pollution Degree 2
Operating Temperature -40 100
°C
Storage Temperature -55 125
°C
Voltage at ON/OFF input pin -2 18 V
INPUT CHARACTERISTICS
Operating Input Voltage Range 35 48 75 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 32 33 34 V
Turn-Off Voltage Threshold 28.5 29.5 30.5 V
Lockout Hysteresis Voltage 2.5 3.5 4.5 V
Maximum Input Current 3.5 A 100% Load, 35 Vin
No-Load Input Current 80 120 mA
Disabled Input Current 1.6 3 mA
Inrush Current Transient Rating 0.01 A2s
Response to Input Transient 150 mV 1000V/ms input transient
Input Reflected-Ripple Current 3 mA P-P thru 10
µH inductor; Figs. 13 & 15
Recommended Input Fuse 20 A fast blow external fuse recommended
Input Filter Component Values (C\L) 2.46\4.7
µF\µH internal values, see Figure E
Recommended External Input Capacitance 33 47
µF see Figure 13
OUTPUT CHARACTERISTICS
Output Voltage Set Point 4.950 5.000 5.050 V
Output Voltage Regulation
Over Line +0.05 \ 2 +0.2 \ 10 %\mV
Over Load +0.05 \ 2 +0.2 \ 10 %\mV
Over Temperature +25 +75 mV
Total Output Voltage Range 4.87 5.13 V over sample, line, load, temperature & life
Output Voltage Ripple and Noise 20MHz bandwidth; Fig. 13 & 16
Peak-to-Peak 50 100 mV Full Load, see Figures 13 & 16
RMS 10 20 mV Full Load, see Figures 13 & 16
Operating Output Current Range 0 20 A
Output DC Current-Limit Inception 21 24 26 A Output Voltage 10% Low; Fig. 17
Output DC Current-Limit Shutdown Voltage 3.1 V
Back-Drive Current Limit while Enabled 0.5 1.0 2.0 A Negative current drawn from output
Back-Drive Current Limit while Disabled 0 10 50 mA Negative current drawn from output
Maximum Output Capacitance 6,000
µF
5.0Vout at 20A Resistive Load
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection 71 dB 120 Hz; Fig. 20
Output Voltage During Load Current Transient
Step Change in Output Current (0.1A/µs) 200 mV 50% to 75% to 50% Iout max; Figure 11
Step Change in Output Current (5A/µs) 200 mV 50% to 75% to 50% Iout max; Figure 12
Settling Time 300 µs to within 1% Vout nom
Turn-On Transient
Turn-On Time 4 8 ms Full load, Vout=90% nom.; Figs. 9 & 10
Start-Up Inhibit Time 180 200 240 ms
-40°C to +125°C; Figure F
Output Voltage Overshoot 0 % 10,000 µF load capacitance, Iout = 0A
EFFICIENCY
100% Load 89 % Figures 1 - 4
50% Load 89 % Figures 1 - 4
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 - 8 for derating curves
ISOLATION CHARACTERISTICS
Isolation Voltage 2000 V
Isolation Resistance 30 M
W
Isolation Capacitance 470 pF
48 V
5.0 V
20 A
Quarter-brick
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 4
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
Parameter
P Min. Typ. Max. Units Notes & Conditions
FEATURE CHARACTERISTICS
Switching Frequency 280 300 320 kHz
ON/OFF Control (Option P)
Off-State Voltage -2 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 -2 0.8 V
ON/OFF Control (Either Option) Figures A, B
Pull-Up Voltage Vin/6.5 9.2 V
Pull-Up Resistance 40 k
W
Output Voltage Trim Range -20 +10 % Measured across Pins 8 & 4; Figure C
Output Voltage Remote Sense Range +10 % Measured across Pins 8 & 4
Output Over-Voltage Protection 117 122 127 % Over full temp range; % of nominal Vout
Over-Temperature Shutdown 125 °C Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis 10 °C
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) 2.8 106 Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta
Calculated MTBF (MIL-217) 1.8 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta
Demonstrated MTBF >25 106 Hrs. Field demonstrated MTBF
PQ60050QGA20 ELECTRICAL CHARACTERISTICS (continued)
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.
STANDARDSCOMPLIANCE
Parameter Notes & Conditions
STANDARDS COMPLIANCE
UL/cUL60950-1 File#E194341,Basicinsulation
EN60950-1 CertiedbyTUV
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ofcialsafetycerticatesonnew
releases or download from the SynQor website.
QUALIFICATIONTESTING
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 15pins MIL-STD-883,method2003
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 5
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
60
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16 18 20
Load Current (A)
Efficiency (%)
36 Vin
48 Vin
75 Vin
Figure 1: Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25
°
C.
82
83
84
85
86
87
88
89
90
0 100 200 300 400 500
Air Flow (LFM)
Efficiency (%)
25 C
40 C
55 C
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).
0
2
4
6
8
10
12
14
16
0 2 4 6 8 10 12 14 16 18 20
Load Current (A)
Power Dissipation (W)
36 Vin
48 Vin
75 Vin
Figure 3: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
0 100 200 300 400 500
Air Flow (LFM)
Power Dissipation (W)
25 C
40 C
55 C
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).
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
across the converter from pin 1 to pin 3 (nominal input voltage).
Figure 6: Thermal plot of converter at 15 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
sideways from pin 1 to pin 3 (nominal input voltage).
0
2
4
6
8
10
12
14
16
18
20
0 25 40 55 70 85
Ambient Air Temperature (oC)
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)
0 LFM (0 m/s)
Semiconductor junction temperature is
within 1
°
C of surface temperature
48 V
5.0 V
20 A
Quarter-brick
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 6
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
Figure 7: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
lengthwise from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 15 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from input to output (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load), (2 ms/div).
Ch1: Vout (2V/div)
Ch2: ON/OFF input (5V/div)
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch1: Vout (2V/div)
Ch2: ON/OFF input (5V/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: 10
µ
F, 100 m
Ω
ESR tantalum capaci-
tor and 1
µ
F ceramic capacitor. Ch1: Vout (200mV/div), Ch2: Iout (5A/div).
Figure 12: Output voltage response to step-change in load current (50%-75%-
50% of Iout(max): dI/dt = 5A/
µ
s). Load cap: 470
µ
F, 30 m
Ω
ESR tantalum
capacitor and 1
µ
F ceramic cap. Ch1: Vout (200mV/div), Ch2: Iout (5A/div).
Vin = 48V
Semiconductor junction temperature is
within 1
°
C of surface temperature
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 7
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
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 cur-
rent and nominal input voltage with 10
µ
H source impedance and 47
µ
F
electrolytic capacitor (100 mA/div). See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10
µ
H source
inductor at nominal input voltage and rated load current (10 mA/div).
See Figure 13.
Figure 16: Output voltage ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 1
µ
F ceramic capacitor
and 10
µ
F tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
Figure 17: Output voltage vs. load current showing typical current limit
curves and converter shutdown points. Figure 18: Load current (10A/div) as a function of time when the
converter attempts to turn on into a 10 m
W
short circuit. Top trace
(2.5ms/div) is an expansion of the on-time portion of the bottom trace.
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0 5 10 15 20
Load Current (A)
Output Voltage (V)
36 V
48 V
75 V
10
µ
H
source
impedance
DC/DC
Converter
Figure 15
Figure 14
Figure 16
1
µ
F
ceramic
capacitor
10
µ
F,
100m
W
ESR
tantalum
capacitor
47
µ
F,
<1
W
ESR
electrolytic
capacitor
VSOURCE
iSiCVOUT
48 V
5.0 V
20 A
Quarter-brick
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 8
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
0.0001
0.001
0.01
0.1
1
10 100 1,000 10,000 100,000
Hz
Output Impedance (W)
36 Vin
48 Vin
75 Vin
Figure 19: Magnitude of incremental output impedance
(Zout = vout/iout) for minimum, nominal, and maximum input voltage
at full rated power.
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000
Hz
Forward Transmission (dB)
36 Vin
48 Vin
75 Vin
Figure 20: Magnitude of incremental forward transmission
(FT = vout/vin) for minimum, nominal, and maximum input voltage at
full rated power.
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000
Hz
Reverse Transmission (dB)
36 Vin
48 Vin
75 Vin
Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout)
for minimum, nominal, and maximum input voltage at full rated power.
0.1
1
10
100
10 100 1,000 10,000 100,000
Hz
Input Impedance (W)
36 Vin
48 Vin
75 Vin
Figure 22: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input
voltage at full rated power.
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 9
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
BASICOPERATIONANDFEATURES
The PowerQor series converter uses a two‑stage power conversion
topology. The first stage is a buck‑converter that keeps the output
voltage constant over variations in line, load, and temperature. The
second stage uses a transformer to provide the functions of input/
output isolation and voltage step‑down to achieve the low output
voltage required.
Both the first stage and the second stage switch at a fixed frequency
for predictable EMI performance. Rectification of the transformer’s
output is accomplished with synchronous rectifiers. These devices,
whichareMOSFETswithaverylowon-stateresistance,dissipatefar
less energy than Schottky diodes. This is the primary reason that the
PowerQor converter has such high efficiency, even at very low output
voltages and very high output currents.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not required,
the PowerQor converter does not need a metal baseplate or potting
material to help conduct the dissipated energy to the heatsink. The
PowerQor converter can thus be built more simply and reliably using
high yield surface mount techniques on a PCB substrate.
The PowerQor series of half‑brick, quarter‑brick and eighth‑
brick converters uses the industry standard footprint and pin‑out
configuration.
See Product Summary web page for options.
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 refer‑
enced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AdetailsfivepossiblecircuitsfordrivingtheON/OFFpin.
FigureBisadetailedlookoftheinternalON/OFFcircuitry.
REMOTE SENSE(+) (Pins 7 and 5):TheSENSE(+)inputscorrect
for voltage drops along the conductors that connect the converter’s
output pins to the load.
Pin7shouldbeconnectedtoVout(+)andPin5shouldbeconnected
toVout(-) atthe pointon theboard whereregulation isdesired. A
remote connection at the load can adjust for a voltage drop only as
large as that specified in this datasheet, that is
[Vout(+)-Vout(-)]–[Vsense(+)-Vsense(-)] <
SenseRange%xVout
Pins7and5mustbeconnectedforproperregulationoftheoutput
voltage. If these connections are not made, the converter will deliver
an output voltage that is slightly lower than its specified value.
Note: the output over-voltage protection circuit senses the voltage
acrosstheoutput(pins8and4)todeterminewhenitshouldtrigger,
not the voltage across the converter’s sense leads (pins 7 and 5).
Therefore, the resistive drop on the board should be small enough so
thatoutputOVPdoesnottrigger,evenduringloadtransients.
Open Collector Enable Circuit
Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently Enabled)
Positive Logic
(Permanently Enabled)
ON/OFF
Vin(_)
ON/OFF
ON/OFF
Vin(_)
ON/OFF
5V
TTL/
CMOS
Vin(_)
ON/OFF
Vin(_)
Vin(_)
TTL
5V
50k
274k
Vin(+)
ON/OFF
Vin(_)
50k
100pF
48 V
5.0 V
20 A
Quarter-brick
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 10
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the
user to adjust the output voltage across the sense leads up or down
according to the trim range specifications.
To decrease the output voltage, the user should connect a resistor
betweenPin6andPin5(SENSE(-)input).Foradesireddecreaseof
the nominal output voltage, the value of the resistor should be
Rtrim‑down =
(
511
)
-10.22 (kΩ)
∆%
where
∆% =
Vnominal–Vdesired
x100%
Vnominal
To increase the output voltage, the user should connect a resistor
betweenPin6andPin7(SENSE(+)input).Foradesiredincreaseof
the nominal output voltage, the value of the resistor should be
Rtrim‑up = (
5.11VOUT(100+∆%) _ 511 _10.22)(kW)
1.225∆% ∆%
where VOUT=NominalOutputVoltage
FigureCgraphstherelationshipbetweenthetrimresistorvalue
andRtrim-upandRtrim-down,showingthetotalrangetheoutput
voltage can be trimmed up or down.
Figure C: Trim Graph for 5.0 Vout module
Note: the TRIM feature does not affect the voltage at which the
output over‑voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over‑voltage protection circuit
to engage, particularly during transients.
It is not necessary for the user to add capacitance at the Trim pin.
The node is internally bypassed to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications,themaximumvariationoftheDCvalueofVout,dueto
both trimming and remote load voltage drops, should not be greater
than that specified for the output voltage trim range.
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compara-
tor 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con-
verterison,theinputvoltagemustfallbelowthetypicalTurn-Off
VoltageThresholdvaluebeforetheconverterwillturnoff.
Output Current Limit: The maximumcurrent limitremains con-
stant as the output voltage drops. However, once the impedance
of the short across the output is small enough to make the output
voltagedropbelowthespecifiedOutputDCCurrent-LimitShutdown
Voltage,theconverterturnsoff.
The converter then enters a “hiccup mode” where it repeatedly
turnsonandoffata5Hz(nominal)frequencywitha5%dutycycle
until the short circuit condition is removed. This prevents excessive
heating of the converter or the load board.
Output Over-Voltage Limit:Ifthevoltageacrosstheoutputpins
exceedstheOutputOver-VoltageProtectionthreshold,theconverter
will immediately stop switching. This prevents damage to the load
circuitdueto1)excessiveseriesresistanceinoutputcurrentpath
fromconverteroutputpinstosensepoint,2)areleaseofashort-
circuitcondition,or 3)arelease ofacurrent limitcondition.Load
capacitance determines exactly how high the output voltage will
rise in response to these conditions. After 200 ms the converter will
automatically restart.
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.
100,000
10,000
1,000
100
100 2 4 6 8 10 12 14 16 18 20
Trim Resistance (kOhms)
% decrease Vout% increase Vout
48 V
5.0 V
20 A
Quarter-brick
48 V
5.0 V
20 A
Quarter-brick
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 11
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
APPLICATIONCONSIDERATIONS
Input System Instability: This
condition can occur because any
DC/DCconverterappearsincrementallyasanegativeresistance
load.Adetailedapplicationnotetitled“InputSystemInstability”
is available on the SynQor web site (www.synqor.com) which
provides an understanding of why this instability arises, and
shows the preferred solution for correcting it.
Application Circuits: Figure D below provides a typical circuit
diagram which details the input filtering and voltage trimming.
Input Filtering and External Capacitance: Figure E below
provides a diagram showing the internal input filter components.
This filter dramatically reduces input terminal ripple current, which
otherwise could exceed the rating of an external input electrolytic
capacitor. The recommended external input capacitance is specified
inthe“InputCharacteristics”section.Moredetailedinformationis
availableintheapplicationnotetitled“EMICharacteristics”onthe
SynQor website.
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200ms when it is
shutdownforanyreason.Whenanoutputshortispresent,this
generatesa5Hz“hiccupmode,”whichpreventstheconverterfrom
overheating. In all, there are seven ways that the converter can be
shutdown,initiatingaStartupInhibitPeriod:
•InputUnder-VoltageLockout
•InputOver-VoltageShutdown(notpresentinQuarter-brick)
•OutputOver-VoltageProtection
•OverTemperatureShutdown
•CurrentLimit
•ShortCircuitProtection
•TurnedoffbytheON/OFFinput
Vin
External
Input
Filter
Trim
Vin(+)
Iload
Cload
L
Vout(+)
Rtrim-up
or
Rtrim-down
Vsense(+)
ON/OFF
Vin(_)
Vin(+)
Vin(_)
Vout(_)
Vsense(_)
Electrolytic
Capacitor
33µF
ESR ≅ 1Ω
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Figure E: Internal Input Filter Diagram (component values listed on page 3).
C
48 V
5.0 V
20 A
Quarter-brick
48 V
5.0 V
20 A
Quarter-brick
48 V
5.0 V
20 A
Quarter-brick
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 12
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
FigureFshowsthreeturn-onscenarios,whereaStartupInhibit
Period is initiated at t0, t1, and t2:
Before time t0,whentheinputvoltageisbelowtheUVLthresh-
old,theunitisdisabledbytheInputUnder-VoltageLockoutfea-
ture.WhentheinputvoltagerisesabovetheUVLthreshold,the
InputUnder-VoltageLockoutisreleased,andaStartupInhibit
Periodisinitiated.Attheendofthisdelay,theON/OFFpinis
evaluated, and since it is active, the unit turns on.
At time t1,theunitisdisabledbytheON/OFFpin,anditcannot
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-OnTime.
Figure F: Startup Inhibit Period (turn-on time not to scale)
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(pos logic)
Vout
Vin
200ms 200ms
200ms
(typical start-up
inhibit period)
t0t1t2t
4ms (typical
turn on time)
ON ON ON
OFF OFF
Product # PQ60050QGA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG650D Rev. E 07/15/09 Page 13
Technical Specification
Input:
Output:
Current:
Package:
48 V
5.0 V
20 A
Quarter-brick
PART NUMBERING SYSTEM
The part numbering system for SynQor’s dc‑dc converters
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. 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
rohs@synqor.com
.
ORDERING INFORMATION
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.
The following options must be included in place of the
w x y z
spaces in the model numbers listed above.
Not all combinations make valid part numbers, please contact
SynQor for availability. See the Product Summary web page for
more options.
PATENTS
SynQorholdsthefollowingU.S.patents,oneormoreof
which apply to this product. 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
Warranty
SynQor offers a three(3)yearlimitedwarranty.Completewarrantyinforma‑
tion 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.
Product Family
Package Size
Performance Level
Thermal Design
Output Current
6/6 RoHS
Options (see
Ordering Information)
Input Voltage
Output Voltage
Contact SynQor for further information:
Phone: 978-849-0600
TollFree: 888-567-9596
Fax: 978-849-0602
E‑mail: power@synqor.com
Web:
www.synqor.com
Address: 155SwansonRoad
Boxborough,MA01719
USA
PQ 60 050 Q G A 20 NKS - G
Model Number Input Voltage Output Voltage Maximum
Output Current
PQ60015QGA25
xyz
-G 35 - 75 V 1.5 V 25 A
PQ60018QGA25
xyz
-G 35 - 75 V 1.8 V 25 A
PQ60020QGA25
xyz
-G 35 - 75 V 2.0 V 25 A
PQ60025QGA25
xyz
-G 35 - 75 V 2.5 V 25 A
PQ60033QGA25
xyz
-G 35 - 75 V 3.3 V 25 A
PQ60050QGA20
xyz
-G 35 - 75 V 5.0 V 20 A
PQ60060QGA17
xyz
-G 35 - 75 V 6.0 V 16.7 A
PQ60120QGA08
xyz
-G 35 - 75 V 12 V 8.3 A
PQ60150QGA07
xyz
-G 35 - 75 V 15 V 6.7 A
PQ60180QGA06
xyz
-G 35 - 75 V 18 V 5.6 A
PQ65180QGA06
xyz
-G 40 - 75 V 18 V 5.6 A
Options Description: x y z
Enable Logic Pin Style Feature Set
P - Positive
N - Negative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard