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Technical Specification
IQ24500HZx10
18-36 V
Input
Output
50 V
Current
10 A
2250 Vdc
Isolation
DC-DC Converter
Half-brick
TheIQ24500HZx10InQor(R)Zetaconverterisanisolated, fixed switching frequency DC-DC converter that uses synchronous rectification to achieve extremely high efficiencyandpowerdensity.The24Vinmodulesfeature 2,250 Vdc isolation and low common mode noise. The Zeta series converters offer industry leading useable outputpowerforanystandard"half-brick"module.RoHS compliant(seelastpage). Operational Features
* Ultra-highefficiency,94%atfullratedloadcurrent,95% athalfratedloadcurrent * Deliversupto10Aofoutputcurrent(500W) * Wideinputvoltagerange:18-36V,with50V 100msinputvoltagetransientcapability * Fixedfrequencyswitchingprovidespredictable EMIperformance * Nominimumloadrequirementmeansnopreload resistorsrequired * Wideoutputvoltagetrimrange(-50%to+10%), seetrimsection
IQ24500HZC10 Module
Protection Features
* Inputunder-voltagelockoutdisablesconverteratlow inputvoltageconditions * Outputcurrentlimitandshortcircuitprotectionprotects converterandloadfromdamageandconsequent hazardousconditions * Activebackbiaslimitprovidessmoothstartupwith externalloadinducedpre-bias * Latchingoutputover-voltageprotectionprotectsload fromdamagingvoltages * Thermalshutdownprotectsconverterfromabnormal environmentalconditions
Mechanical Features
* Industrystandardhalf-brickpin-outconfiguration * Bricksize:2.39"x2.49"(63.1x60.6mm) * Totalheightonly0.512"(13mm) * Totalweight:4.3oz.(123grams)
Control Features
* On/Offcontrolreferencedtoinputside
Safety Features
* 2250V,30Minput-to-outputisolation * UL60950-1:2003,basicinsulation * CAN/CSA-C22.2No.60950-1:2003 * EN60950-1:2001 * CEMarked * RoHScompliant(seePage12)
Product # IQ24500HZx10 Phone 1-888-567-9596
Contents
MechanicalDiagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 IQ24500HZC10ELECTRICALCHARACTERISTICS. . . . . . . . . . . . . . . . .3-4 StandardscomplianceandQualificationTesting . . . . . . . . . . . . . . . . . . . 4 IQ24500HZC10Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7 ApplicationSection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11 OrderingInformation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PageNo.
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Doc.# 005-HZC2450 Rev. D
06/16/09
Page 1
Technical Specification
Mechanical Diagram
2.486 2.00 1.400 1.000 .700 .400 [ 50.8 ] [ 35.56 ] [ 25.4 ] [ 17.78 ] [ 10.16 ] .243 .020 [ 6.17 0.5 ] .020 [ 63.14 0.5 ]
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
.512
[
+.002 -.005 +0.05 13 -0.12 OVERALL HEIGHT
]
.163 [ 4.14 ]
9
2.386 .020 [ 60.6 0.5 ] 1.90 [ 48.3 ]
8
7
6
5
.243 .020 [ 6.17 0.5 ]
TOP VIEW
1.90 [ 48.3 ]
SIDE VIEW
.233 .020 [ 5.92 0.5 ]
1
2
3
4
.543 .400 1.00 1.400
.020 [ 13.79 0.5 ] [ 10.16 ] [ 25.4 ] [ 35.56 ]
THRU HOLE M3 (SEE NOTE 8) STANDOFFS (4)
.027
+.007 -.010 +0.17 0.69 -0.25 BOTTOMSIDE CLEARANCE
[
]
NOTES
1) APPLIEDTORQUEPERSCREWSHOULDNOTEXCEED6in-lb(0.7Nm). 2) BASEPLATEFLATNESSTOLERANCEIS0.004"(.10mm) TIRFORSURFACE. 3) PINS1-4,6-8ARE0.040"(1.02mm)DIA.WITH0.080"(2.03mm) DIA.STANDOFFSHOULDERS 4) PINS5AND9ARE0.080"(2.03mm)DIA.WITH.125"(3.18)DIA. STANDOFFSHOULDERS 5) ALLPINS:MATERIAL:COPPERALLOY FINISH:MATTETINOVERNICKELPLATE 6) UNDIMENSIONEDCOMPONENTSARESHOWNFORVISUAL REFERENCEONLY 7) WEIGHT:139g/4.9oz 8) THREADEDORNON-THREADEDOPTIONSAVAILABLE 9) ALLDIMENSIONSININCHES(mm)TOLERANCES:X.XXIN+/-0.02 (X.Xmm+/-0.5mmX.XXXIN+/-0.010(X.XXmm+/-0.25mm)
PIN DESIGNATIONS
Pin 1 2 3 4 5 6 7 8 9 Notes: 1) 2) 3) SENSE(-)shouldbeconnectedtoVout(-)either remotelyorattheconverter. LeaveTRIMpinopenfornominaloutputvoltage. SENSE(+)shouldbeconnectedtoVout(+) eitherremotelyorattheconverter.
Doc.# 005-HZC2450 Rev. D 06/16/09 Page 2
Name Vin(+) ON/OFF Reserved Vout(-) Vout(-) SENSE(-) TRIM SENSE(+) Vout(+)
Function Positiveinputvoltage TTLinputtoturnconverteronandoff, referencedtoVin(-),withinternalpullup. NotConnected Negativeoutputvoltage Negativeoutputvoltage Negativeremotesense1 Outputvoltagetrim2 Positiveremotesense3 Positiveoutputvoltage
Product # IQ24500HZx10
Phone 1-888-567-9596
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Technical Specification
IQ24500HZC10 ELECTRICAL CHARACTERISTICS
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 Maximum Input Current No-Load Input Current Disabled Input Current Response to Input Transient Input Reflected Ripple Current Input Terminal Ripple Current Recommended Input Fuse Input Filter Component Values (L\C) Recommended External Input Capacitance OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Line1 Over Load1 Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise2 Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage3 Back-Drive Current Limit while Enabled Back-Drive Current Limit while Disabled Maximum Output Capacitance DYNAMIC CHARACTERISTICS Output Voltage during Load Current Transient For a Step Change in Output C urrent (0.1 A/s) For a Step Change in Output Current (5 A/s) Settling Time Turn-On Transient Turn-On Time Output Voltage Overshoot EFFICIENCY 100% Load 50% Load TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature Board Temperature Transformer Temperature ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) Isolation Resistance Isolation Capacitance4
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
TA=25C, airflow rate=300 LFM, Vin=24Vdc unless otherwise noted; full operating temperature range is -40C to +100C ambient temperature with appropriate power derating. Specifications subject to change without notice.
Min. Typ. Max.
50 40 50 2250 100 125 18 24 17.0 15.5 1.5 300 100 1.5 10 500 0.34\23 470 48.60 50.00 +0.25\125 +0.25\125 +0.380 48.5 250 60 0 11 2 0 12 20 3 3 36 17.5 16.0 2.0 38 350 125 25 40
Units
V V V V C C V V V V V A mA mA V mA mA A H\F F V %\mV %\mV V V mV mV A A V A mA mF V V ms
Notes & Conditions
Continuous Continuous 100ms transient, square wave Basic insulation, Pollution Degree 2
-40 -55 -2 18 16.5 15.0 1.0
50 V transient for 100 ms
100% Load, 18 Vin, trimmed up 10% 0.25 V/s input transient RMS thru 3.3 H inductor RMS Fast blow external fuse recommended Internal values; see Figure E Typical ESR 0.1-0.2 W
51.35
+1.000 51.45 300 75 10 13 4 7 1
Over sample, line, load, temperature & life 20 MHz bandwidth Full Load Full Load Subject to thermal derating Output Voltage 10% Low Negative current drawn from output source Negative current drawn from output source 10 A Resistive Load 50% to 75% to 50% Iout max, 200 F load cap " To within 1% Vout nom Full load, ON/OFF to Vout=90% nom. No load, 1mF load cap Figures 1 & 2 Figures 1 & 2 Package rated to 150C UL rated max operating temp 130C
2 2 8 24 35 94 95 125 125 125 2250 30 1000 40 2
ms % % % C C C V MW pF
Note Note Note Note
1: 2: 3: 4:
Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference. For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com). If the output voltage falls below the Output DC Current Limit Shutdown Voltage for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time. Higher values of isolation capacitance can be added external to the module.
Product # IQ24500HZx10
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Doc.# 005-HZC2450 Rev. D
06/16/09
Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS Switching Frequency Regulation Stage Switching Frequency Isolation Stage ON/OFF Control (Option N) Off-State Voltage On-State Voltage ON/OFF Control ON/OFF Control Hysteresis Pull-Up Voltage Pull Up Resistance Output Voltage Trim Range Output Over-Voltage Protection Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis RELIABILITY CHARACTERISTICS Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
Min.
232 116.0 4.0 -2 4.75 -50 113
Typ.
235 117.5
Max.
237 118.5 18 1.0
Units
kHz kHz V V V V kW % % C C 106 Hrs. 106 Hrs. 106 Hrs.
Notes & Conditions
Over sample, temp & life Over sample, temp & life
1.5 5.00 10 118 120 10 TBD TBD
5.25 +10 123
Measured across Pins 9 & 5; see trim section Over full temp range; % of nominal Vout Average PCB Temperature TR-NWT-000332; 80% load,300LFM, 40C Ta MIL-HDBK-217F; 80% load, 300LFM, 40C Ta See website for details
Standards compliance and Qualification Testing
Parameter
STANDARDS COMPLIANCE UL60950-1:2003 CAN/CSA-C22.2No.60950-1:2003 EN60950-1:2001 CEMarked IEC61000-4-2 2006/95/ECLowVoltageDirective ESDtest,8kV-NP,15kVair-NP(NormalPerformance) BasicInsulation
Notes & Conditions
Note:Anexternalinputfusemustalwaysbeusedtomeetthesesafetyrequirements.ContactSynQorforofficialsafetycertificatesonnew releasesordownloadfromtheSynQorwebsite.
Parameter
QUALIFICATION TESTING LifeTest Vibration MechanicalShock TemperatureCycling Power/ThermalCycling DesignMarginality Humidity Solderability
# Units
32 5 5 10 5 5 5 15pins
Test Conditions
95%ratedVinandload,unitsatderatingpoint,1000hours 10-55Hzsweep,0.060"totalexcursion,1min./sweep,120sweepsfor3axis 100gminimum,2dropsinxandyaxis,1dropinzaxis -40Cto100C,unittemp.ramp15C/min.,500cycles Toperating=mintomax,Vin=mintomax,fullload,100cycles Tmin-10CtoTmax+10C,5Csteps,Vin=mintomax,0-105%load 85C,85%RH,1000hours,continuousVinappliedexcept5min/day MIL-STD-883,method2003
Product # IQ24500HZx10
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Doc.# 005-HZC2450 Rev. D
06/16/09
Page 4
Technical Specification
100 95 50 90 60
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
Power Dissipation (W)
18 Vin 24 Vin 36 Vin 0 1 2 3 4 5 6 7 8 9 10
40
Efficiency (%)
85 80 75 70 65 60
30
20 18 Vin 24 Vin 36 Vin 0 0 1 2 3 4 5 6 7 8 9 10
10
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 2: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
10 9 8 7
12
10
8
Iout (A)
5 4 3 2 1 0 25 40 55 70 85
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)
6
6
4 400 LFM (2.0 m/s) 2 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 25 40 55 70 85
Ambient Air Temperature (C)
Ambient Air Temperature (C)
Figure 3: Encased converter (without heatsink) max. output power derating vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows across the converter from input to output (nominal input voltage).
Figure 4: Encased converter (with 1/2" heatsink) max. output power derating vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows across the converter from input to output (nominal input voltage).
Figure 5: Turn-on transient at full load (resistive load) (10 ms/div). Ch 1: Vout (10 V/div) Ch 2: ON/OFF input (5 V/div)
Product # IQ24500HZx10 Phone 1-888-567-9596
Figure 6: Turn-on transient at zero load (10 ms/div). Ch 1: ON/OFF input (5 V/div) Ch 2: Vout (10 V/div)
Doc.# 005-HZC2450 Rev. D 06/16/09 Page 5
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Technical Specification
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
Figure 7: Output voltage response to step-change in load current (50%-75%-50% of Iout(max); dI/dt = 0.1 A/s; 1 ms/div). Load cap: 1 uF ceramic and 330 F, 15 mW ESR electrolytic capacitors. Top trace: Vout (1 V/div). Bottom trace: Iout (5 A/div). Figure 11 3.3 H
Figure 8: Output voltage response to step-change in load current (50%-75%-50% of Iout(max): dI/dt = 5 A/s; 2 ms/div). Load cap: 330 F, 15 mW ESR electrolytic capacitor. Top trace: Vout (1.0 V/div). Bottom trace: Iout 10 A/div).
source impedance
Figure 10 Figure 12
iS
VSOURCE
iC
DC-DC Converter 1 F
VOUT
100 F,
470 F, 0.2 W ESR
electrolytic capacitor
ceramic 10 mW ESR capacitor electrolytic capacitor
Figure 9: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 10), Input Reflected Ripple Current (Figure 11) and Output Voltage Ripple (Figure 12).
Figure 10: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 3.3 H source impedance and 470 F electrolytic capacitor (200 mA/div; 2 s/div). See Figure 9.
Figure 11: Input reflected ripple current, is, through a 3.3 H source inductor, using a 470 F input capacitor, at nominal input voltage and rated load current (10 mA/div; 2 s/div). See Figure 9.
Product # IQ24500HZx10 Phone 1-888-567-9596
Figure 12: Output voltage ripple at nominal input voltage and rated load current (50 mV/div; 2 s/div). Load capacitance: 1 F ceramic capacitor and 100 F electrolytic capacitor. Bandwidth: 20 MHz. See Figure 9.
Doc.# 005-HZC2450 Rev. D 06/16/09 Page 6
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Technical Specification
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
Figure 13: Output voltage response to step-change in input voltage (18 V to 36 V in 200 s; 400 s/div). Load cap: 470 F, 15 mW ESR electrolytic capacitor. Top trace: Vin (5.0 V/div). Bottom trace: Vout (1.0 V/div), at zero load current.
61 57 53
Figure 14: Load current (5 A/div; 10 ms/div) as a function of time when the converter attempts to turn on into a 1 mW short circuit.
Output Voltage (V)
49 45 41 37 33 29 25 21 -4 -2 0 2 4 6 8 10 12 14 18 Vin 24 Vin 36 Vin
Load Current (A)
Figure 15: Output voltage vs. load current showing typical current limit curves and OVP shutdown point.
Product # IQ24500HZx10
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Doc.# 005-HZC2450 Rev. D
06/16/09
Page 7
Technical Specification
BASIC OPERATION AND FEATURES
The converter series uses a two-stage power conversion topology. The first stage 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 stepdown 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 significantly less energy than Schottky diodes, enabling the converter to achieve high efficiency. The series of half-brick, quarter-brick and eighth-brick converters uses the industry standard footprint and pin-out configuration.
ON/OFF ON/OFF
Input: Output: Current: Package:
CONTROL FEATURES
18-36 V 50 V 10 A (500 W) Half-brick
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(-). The ON/OFF signal is active low (meaning that a low voltage turns the converter on). Figure A details four possible circuits for driving the ON/OFF pin. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter's output pins to the load. Pin 8 should be connected to Vout(+) and Pin 6 should be connected to Vout(-) at the point on the board where regulation is desired. If these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. Note: The output over-voltage protection circuit senses the voltage across the sense leads (pins 8 and 6) to determine when it should trigger, not the voltage across the converter's output pins (pins 9 and 5). OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. SynQor uses industry standard trim equations. To decrease the output voltage, the user should connect a resistor between Pin 7 (TRIM) and Pin 6 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be:
Vin(_)
Remote Enable Circuit
Vin(_)
Negative Logic (Permanently Enabled)
ON/OFF
CMOS
5V ON/OFF
Vin(_)
Open Collector Enable Circuit
Vin(_)
Direct Logic Drive
Rtrim-down =
where
(100%) _ 2
kW
Figure A: Various circuits for driving the ON/OFF pin.
% =
Vnominal - Vdesired Vnominal
x 100%
Product # IQ24500HZx10
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Doc.# 005-HZC2450 Rev. D
06/16/09
Page 8
Technical Specification
To increase the output voltage, the user should connect a resistor between Pin 7 (TRIM) and Pin 8 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be
Input: Output: Current: Package:
PROTECTION FEATURES
18-36 V 50 V 10 A (500 W) Half-brick
Rtrim-up =
( Vnominal - 2 ) x V 1.225
DES
+ VNOM
kW
VDES - VNOM
Figure B graphs the relationship between the trim resistor value, Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down.
100,000.0 100,000.0 10,000.0 10,000.0
Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping to avoid an input system instability problem, which is described in more detail in the application note titled "Input System Instability" on the SynQor website. 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* 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. Output Current Limit: If the output current exceeds the "Output DC Current Limit Inception" point*, then a fast linear current limit controller will reduce the output voltage to maintain a constant output current. If as a result, the output voltage falls below the "Output DC Current Limit Shutdown Voltage"* for more than 50 ms, then the unit will enter into hiccup mode, with a 500 ms off-time. The unit will then automatically attempt to restart. Back-Drive Current Limit: If there is negative output current of a magnitude larger than the "Back-Drive Current Limit while Enabled" specification*, then a fast back-drive limit controller will increase the output voltage to maintain a constant output current. If this results in the output voltage exceeding the "Output OverVoltage Protection" threshold*, then the unit will shut down. The full I-V output characteristics can be seen in Figure 15. Output Over-Voltage Limit: If the voltage directly across the output pins exceeds the "Output Over-Voltage Protection" threshold*, the converter will immediately stop switching. This shutdown is latching; unlike other shutdown types, the converter will not restart unless the input power is cycled or the ON/OFF input is toggled. 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*.
Trim Resistance (kOhms)
1,000.0 1,000.0 100.0 100.0 10.0 10.0 1.0 1.0 0.1 0.1 0.0 0.0 0 0
5
10
15
20
25
30
35
40
45 45
50 50
% Increase in Vout
% Decrease in Vout
Figure B: Trim Graph for 28 Vout module 50 Vout module Figure B: Trim Graph
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 filtered 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.
* See Electrical Characteristics page.
Product # IQ24500HZx10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-HZC2450 Rev. D 06/16/09 Page 9
Technical Specification
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 website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits: Figure C below provides a typical circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Input Capacitance: Figure D below shows the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. The recommended external input capacitance is specified in the Input Characteristics section on the Electrical Specifications page. More detailed information is available in the application note titled "EMI Characteristics" on the SynQor website.
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
Output Filtering and External Output Capacitance: Figure D below shows the internal output filter components. This filter dramatically reduces output voltage ripple. However, some minimum external output capacitance is required, as specified in the Output Characteristics section on the Electrical Specifications page. No damage will occur without this capacitor connected, but peak output voltage ripple will be much higher.
Vin
External Input Filter
Electrolytic Capacitor
Vin(+)
Vout(+) Vsense(+) Rtrim-up
or
ON/OFF
Trim
Vsense(_) Vin(_) Vout(_)
Rtrim-down
Cload
Iload
Figure C: Typical application circuit (negative logic unit, permanently enabled).
Lin
Vin(+) C1 Vin(_) C2
Regulation Stage Isolation Stage
Vout(+)
Current Sense
Vout(_)
Figure D: Internal Input and Output Filter Diagram (component values listed on specifications page).
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Technical Specification
Startup Inhibit Period:TheStartupInhibitPeriodensures that the converter will remain off for approximately 200 ms when it is shut down for any reason. When an output shortispresent,thisgeneratesa5Hz"hiccupmode,"which prevents the converter from overheating. In all, there are sevenwaysthattheconvertercanbeshutdown,initiatinga StartupInhibitPeriod: *InputUnder-VoltageLockout *OutputOver-VoltageProtection
Input: Output: Current: Package:
18-36 V 50 V 10 A (500 W) Half-brick
WhentheON/OFFpingoeshighaftert2,theStartupInhibit Period has elapsed, and the output turns on within the typicalTurn-OnTime. Thermal Considerations:Themaximumoperatingbaseplate temperature, TB, is 100 C. As long as the user's thermal system keeps TB < 100 C, the converter can deliveritsfullratedpower.
Apowerderatingcurvecanbecalculatedforanyheatsink thatisattachedtothebase-plateoftheconverter.Itisonly *OverTemperatureShutdown necessarytodeterminethethermalresistance,RTHBA,ofthe chosenheatsinkbetweenthebase-plateandtheambientair *CurrentLimit foragivenairflowrate.Thisinformationisusuallyavailable *ShortCircuitProtection fromtheheatsinkvendor.Thefollowingformulacanthebe *TurnedoffbytheON/OFFinput used to determine the maximum power the converter can Figure E shows three turn-on scenarios, where a Startup dissipateforagiventhermalconditionifitsbase-plateisto benohigherthan100C. InhibitPeriodisinitiatedatt0,t1,andt2: Before time t0, 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 UVLthreshold,theInputUnder-VoltageLockoutisreleased, andaStartupInhibitPeriodisinitiated.Attheendofthis delay, the ON/OFF pin is evaluated, and since it is active, theunitturnson. 100C-TA max Pdiss = RTHBA This value of power dissipation can then be used in conjunction with the data shown in Figure 2 to determine themaximumloadcurrent(andpower)thattheconverter candeliverinthegiventhermalcondition.
At time t1, the unit is disabled by the ON/OFF pin, and it For convenience, Figures 3 and 4 provide Power derating cannot be enabled again until the Startup Inhibit Period curves for an encased converter without a heatsink and haselapsed. withatypicalheatsink.
Vin
Under-Voltage LockoutTurnOnThreshold
ON/OFF
(neglogic)
ON
OFF ON
OFF
ON 9ms(typical
Vout
(typicalstart-up inhibitperiod)
200ms
turnontime)
200ms
200ms
t0
t1
t2
t
Figure E: Startup Inhibit Period (turn-on time not to scale)
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Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's dc-dc converters followstheformatshownintheexamplebelow.
IQ 2 4 500 H Z C 10 N R S - G 6/6 RoHS
(see Ordering Information)
Input: Output: Current: Package:
ORDERING INFORMATION
18-36 V 50 V 10 A (500 W) Half-brick
Thetablesbelowshowthevalidmodelnumbersandordering optionsforconvertersinthisproductfamily.Whenordering SynQorconverters,pleaseensurethatyouusethecomplete 15 character part number consisting of the 12 character basepartnumberandtheadditionalcharactersforoptions. Add"-G"tothemodelnumberfor6/6RoHScompliance.
Model Number IQ24280HZw18NRS-G IQ24500HZw10NRS-G Input Voltage 18 - 36 V 18 - 36 V Output Voltage 28 V 50 V Max Output Current 18 A 10 A
Options
Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family
The following options must be included in place of the w x y z spaces in the model numbers listed above.
Options Description: w x y z Thermal Design Enable Logic Pin Style Feature Set
The first 12 characters comprise the base part number and the last 3 characters indicate available options. The "-G" suffixindicates6/6RoHScompliance.
C - Encased with Threaded Baseplate D - Encased with Non-Threaded Baseplate
N - Negative
R - 0.180"
S - Standard
Application Notes
Avarietyofapplicationnotesandtechnicalwhitepaperscan bedownloadedinpdfformatfromourwebsite.
RoHS Compliance:TheEUledRoHS(RestrictionofHazardous Substances)DirectivebanstheuseofLead,Cadmium,Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and PolybrominatedDiphenylEther(PBDE)inElectricalandElectronic 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 pageore-mailusatrohs@synqor.com.
Not all combinations make valid part numbers, please contact SynQorforavailability. SeetheProductSummarywebpagefor moreoptions.
PATENTS
SynQorholdsthefollowingpatents,oneormoreofwhich mightapplytothisproduct: 5,999,417 6,594,159 6,927,987 7,119,524 6,222,742 6,731,520 7,050,309 7,269,034 6,545,890 6,894,468 7,072,190 7,272,021 6,577,109 6,896,526 7,085,146 7,272,023
Contact SynQor for further information:

Phone: TollFree: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 power@synqor.com www.synqor.com 155SwansonRoad Boxborough,MA01719 USA
Phone 1-888-567-9596
Warranty SynQoroffersatwo(2)yearlimitedwarranty.Completewarranty informationislistedonourwebsiteorisavailableuponrequestfrom SynQor. InformationfurnishedbySynQorisbelievedtobeaccurateandreliable. However,noresponsibilityisassumedbySynQorforitsuse,norforany infringementsofpatentsorotherrightsofthirdpartieswhichmayresult fromitsuse.Nolicenseisgrantedbyimplicationorotherwiseunderany patentorpatentrightsofSynQor.
Product # IQ24500HZx10
www.synqor.com
Doc.# 005-HZC2450 Rev. D
06/16/09
Page 12

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