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Technical S pecification
NQ16W50SKA10
6.0-16.0V Input 0.75-5.0V Outputs 10 Amp Current Non Isolated SMT
Sur face Mount
Th e N iQo r (R) S M T D C / D C c o n v e r t e r i s a n o n - i s o l a t e d b u c k re gu la tor, wh ich e mplo ys synchro no us recti ficat ion to ach i ev e ext rem ely h i gh c onv ers ion eff i ci enc y. T h e N iQor fa m ily o f c on v e rt e rs are us ed p re d om i n at e ly i n D PA sys t em s usi ng a front end DC /DC high p ower br ick (48 Vin to low vo l ta ge bu s) . Th e n o n -i so la te d Ni Qo r c on v e rt e rs a re t h e n used a t t he poi n t of load t o crea t e t h e low v olt a ge out p ut s requ ired by t h e desi gn . T he wi de t ri m m odu le ca n b e pro gram m ed t o a v ari et y of ou t pu t v olt a ges t hr ough t he u se of a single external resistor. RoHS compliant (see page 12 ).
Operational Features
* Ultra high efficiency, up to 94.5% at full rated load * Delivers up to 10 Amps of output current with minimal derating - no heatsink required * Input Voltage Range : 6.0 - 16.0V * Fast transient response time * On-board input and output filter capacitor * No minimum load requirement means no preload resistors required
Non-Isolated
NiQor surface mount module
Pr otection Features
* Input under-voltage lockout disables converter at low input voltage conditions * Temperature compensated over-current shutdown 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
Mechanical Features
* DOSA standard SMT pin-out configuration
* Industry standard size: 1.3" x 0.53" x 0.29" (33 x 13.5 x 7.3 mm) * Total weight: 0.18 oz. (5 grams), lower mass greatly reduces vibration and shock problems * Open frame construction maximizes air flow cooling * Also available in SIP packaging
Safety Features
* UL/cUL 60950-1 recognized (US & Canada) * 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
Contr ol Features
* On/Off control * Output voltage trim (industry standard) permits custom voltages and voltage margining * Remote Sense (standard option)
Product # NQ16W50SKA10
Phone 1-888-567-9596
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Doc.# 005-NS15W10 Rev. A
11/26/07
Page 1
Technical Specification
MECHANICAL DIAGRAM
Surface Mount Package
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
1.30
(33.0)
0.288+.018
(7.32+0.45)
see Note 4 0.025
(0.64)
1
0.063
(1.60)
2
3
4
5
0.075
(1.91)
0.405
(10.29)
0.53
(13.5)
Typ.
6
0.297
(7.54)
7
0.012+.007
(0.3+0.17)
0.100
(2.54)
0.487
(12.37)
0.048
(1.22)
0.063
(1.6)
Bottomside Clearance
Typ.
0.677
(17.20)
0.867
(22.02)
Side View
1.057
(26.85)
1.177
(29.90)
Bottom View
Recommended SMT Pad Size: Minimum: 0.074" x 0.122" (1.88mm x 3.1mm) Maximum: 0.095" x 0.140" (2.41mm x 3.56mm)
NOTES
1) SMT Contacts: Material - Brass Finish - Gold over Nickel plate 2) Undimensioned components are shown for visual reference only. 3) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 4) Coplanarity for pins 1-7 is 0.004" max 5) Weight: 0.18 oz. (5 g) typical 6) Workmanship: Meets or exceeds IPC-A-610C Class II
SMT CONTACT DESIGNATIONS
Pin No. Name Function
1 2 3 4 5 6 7
N/C GND Vout(+) TRIM SENSE(+) Vin(+) ON/OFF
No Connection Ground Positive output voltage Output Voltage Trim Positive remote sense Positive input voltage Input to turn converter on/off
Pins in Italics Shaded text are Optional
Product # NQ16W50SKA10
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Doc.# 005-NS15W10 Rev. A
11/26/07
Page 2
Technical Specification
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
TA=25C, airflow rate=300 LFM, Vin=12Vdc unless otherwise noted; full operating temperature range is -40C to +105C ambient temperature with appropriate power derating. Specifications subject to change without notice.
ELECTRICAL CHARACTERISTICS - NQ16W50SKA10 Series
Parameter
Module
All All All All All All All All All All All All All 0.75V 2.5V 5.0V 0.75V 2.5V 5.0V All All All 0.75V 2.5V 5.0V 0.75V All All All All All All 1.0V 2.5V 5.0V All All All All All All All All All 0.75V 2.5V 5.0V 0.75V 2.5V 5.0V 2 2 78.0 91.0 94.5 81.0 91.0 92.5
Min.
0 -40 -55 -3 6 100 0.75 0 5.35 4.50
Typ.
Max.
18 16 105 125 15 16 20 5.5 16
Units
V V C C V V A F V A V V V A A A mA mA mA mA A 2s F mA mA mA V V A % % % % mV mV mV A F dB mV mV s
Notes & Conditions
Continuous Continuous
ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating Operating Operating Temperature Storage Temperature Voltage at ON/OFF input pin RECOMMENDED OPERATING CONDITIONS Input Voltage Range Input Fuse Rating External Input Capacitance Output Voltage Output Current INPUT CHARACTERISTICS Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Maximum Input Current " " No-Load Input Current " " Disabled Input Current Inrush Current Transient Rating Input Filter Capacitor Value Input Reflected-Ripple Current " " OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Range Operating Output Current Range Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise (pk-pk\RMS) " " Output DC Over Current Shutdown External Output Capacitance DYNAMIC CHARACTERISTICS Input Voltage Ripple Rejection Output Voltage during Current Transient For a Step Change in Output Current (0.1A/s) For a Step Change in Output Current (3A/s) Settling Time Turn on Transient Inhibit Time Rise Time Output Voltage Overshoot EFFICIENCY 100% Load " " 50% Load " "
Fast blow external fuse recommended ESR<1.5W
5.73 4.73 1
6.10 4.95 1.6 4.5 8.6
31 71 132 3 0.1 30 36 68 98 0.745 0.75 0 0.75 0.755 5.0 10 0.5 0.5 1 3 27\5.0 43\11.6 67\20.4 19 50 180 180 100 4 6 0
6Vin, 100% load " " 12Vin " " With min. output capacitance 12Vin, 100% load, pk-pk value " " 12Vin 50% load Set output by Rtrim-up With sense pin " " With sense pin, over sample, line, load, temp. & life Full load; 20MHz bandwidth " " >0.5mW 120Hz 50%-75%-50% Iout max; 100uF 50%-75%-50% Iout max; 470uF To within 1.5% Vout nom. Resistive load " "
12 100
24 5000
ms ms V % % % % % %
Product # NQ16W50SKA10
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Doc.# 005-NS15W10 Rev. A
11/26/07
Page 3
Technical Specification
Parameter
Module
All All All All All All All All All All All All All All All All All 275 1.5 -3.0 20 -0.2 2.2 5 100 0.75 5.6 6.0 128 10 TBD TBD 5.5 6.4 1.0 Vin 300
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
ELECTRICAL CHARACTERISTICS (continued) - NQ16W50SKA10 Series
Min. Typ. Max.
125 125 325 6.5 0.6
Units
C C kHz V V kW
Notes & Conditions
Package rated to 150C UL rated max operating temp 130C Half on small duty cycle (e.g. 16Vin; 0.75Vout) See Figure A
TEMP LIMITS FOR POWER DERATING Semiconductor Junction Temperature Board Temperature FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control Open Logic (O) ON/OFF Control Off-State Voltage On-State Voltage Input Resistance Positive Logic (P) ON/OFF Control Logic Low Voltage Range Logic High Voltage Range (internal pullup) 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
Open collector/drain input; see Figure A V V V kW V V C C
Measured Vout+ to common pins Over full temp range Average PCB Temperature
106 Hrs. TR-NWT-000332; 100% load, 200LFM, 40oC Ta 106 Hrs. MIL-HDBK-217F; 100% load, 200LFM, 40oC Ta 106 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter P
STANDARDS COMPLIANCE
Notes
File # E194341 Certified by TUV Test on entire assembly; board & plastic components UL94V-0 compliant ESD test, 8kV - NP, 15kV air - NP (Normal Performance) Section 7 - electrical safety, Section 9 - bonding/grounding
UL/cUL 60950-1 EN60950-1 72/23/EEC 93/68/EEC Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 GR-1089-CORE Telcordia (Bellcore) GR-513
* An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
# Units
32 5 5 10 5 5 5 15 pins
Test Conditions
10-55Hz sweep, 0.060" total excursion,1 min./sweep, 120 sweeps for 3 axis
Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability
95% rated Vin and load, units at derating point, 1000 hours
100g minimum, 2 drops in x and y axis, 1 drop in z axis -40C to 100C, unit temp. ramp 15C/min., 500 cycles Toperating = min to max, Vin = min to max, full load, 100 cycles Tmin-10C to Tmax+10C, 5C steps, Vin = min to max, 0-105% load 85C, 85% RH, 1000 hours, continuous Vin applied except 5min./day MIL-STD-883, method 2003
* Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply
robust, reliable product. Contact the factory for official product family qualification documents.
OPTIONS
SynQor provides various options for Packaging, Enable Logic, and Feature Set for this family of DC/DC converters. Please consult the last page for information on available options.
PATENTS
SynQor is protected under various patents. Please consult the last page for further details.
Product # NQ16W50SKA10
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Doc.# 005-NS15W10 Rev. A
11/26/07
Page 4
Technical Specification
100 95 5 90 6
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
Power Dissipation (W)
4
Efficiency (%)
85 80 75 70 65 60 0 1 2 3 4 5 6 7 8 9 10
3
2 5.0 Vout 2.5 Vout 0.75 Vout 0 0 1 2 3 4 5 6 7 8 9 10
5.0 Vout 2.5 Vout 0.75 Vout
1
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for nominal input voltage at 25C.
Figure 2: Power dissipation at nominal output voltage vs. load current for nominal input voltage at 25C.
12
10
8
Iout (A)
6
4
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 layers 2oz cu board
2
0 0 25 40 55 70 85
Semiconductor junction temperature is within 1C of surface temperature
Ambient Air Temperature (C)
Figure 3: Maximum output power derating curves for 0.75Vo, 1.2Vo, 1.5Vo units under various thermal conditions and nominal input voltage. See Thermal Considerations section for more details.
12
Figure 4: Thermal plot of 0.75Vo, 1.2Vo converters at nominal Vin and 10 amp load current mounted on a 85C, 6-Layer, 2 oz. copper board (typical installation).
10
8
Iout (A)
6
4
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 layers 2oz cu board
2
0 0 25 40 55 70 85
Semiconductor junction temperature is within 1C of surface temperature
Ambient Air Temperature (C)
Figure 5: Maximum output power derating curves for 1.8Vo, 2.5Vo units under various thermal conditions and nominal input voltage. See Thermal Considerations section for more details.
Product # NQ16W50SKA10 Phone 1-888-567-9596
Figure 6: Thermal plot of 1.8Vo, 2.5Vo converters at nominal Vin and 10 amp load current mounted on a 70C, 6-Layer, 2 oz. copper board (typical installation).
Doc.# 005-NS15W10 Rev. A 11/26/07 Page 5
www.synqor.com
Technical Specification
12
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
10
8
Iout (A)
6
4
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 layers 2oz cu board
2
0 0 25 40 55 70 85
Semiconductor junction temperature is within 1C of surface temperature
Ambient Air Temperature (C)
Figure 7: Maximum output power derating curves for 3.3Vo, 5.0Vo units under various thermal conditions and nominal input voltage. See Thermal Considerations section for more details.
Figure 8: Thermal plot of 3.3Vo, 5.0Vo converters at nominal Vin and 10 amp load current mounted on a 70C, 6-Layer, 2 oz. copper board (typical installation).
5.0Vout
5.0Vout
3.3Vout
3.3Vout
1.8Vout
1.8Vout 0.75Vout
0.75Vout
on/off
on/off
Figure 9: Turn-on transient at full load (resistive load) (2 ms/div). Ch 1: ON/OFF input (5V/div) Ch 2-4: Vout (1V/div)
Figure 10: Turn-on transient at zero load (2 ms/div). Ch 1: ON/OFF input (5V/div) Ch 2-4: Vout (1V/div)
5.0Vout
5.0Vout
2.5Vout
2.5Vout
1.5Vout
1.5Vout
Iout
Iout
Figure 11: Output voltage response for 1.5V, 2.5V, 5V units to step-change in load current (50-75-50% of Iout max; di/dt=0.1A/ s). Load cap: 100 F, 100mW ESR tant, 10 F cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (100mV/div).
Product # NQ16W50SKA10 Phone 1-888-567-9596
Figure 12: Output voltage response for 1.5V, 2.5V, 5V units to step-change in load current (50-75-50% of Iout max; di/dt=3A/ s). Load cap: 470 F, 100mW ESR tant, 10 F cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (100mV/div).
Doc.# 005-NS15W10 Rev. A 11/26/07 Page 6
www.synqor.com
Technical Specification
See Fig. 14
source impedance
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
1 H
See Fig. 15 See Fig. 16
0.9Vout
iS
VSOURCE
VIN
DC/DC Converter
1.8Vout
VOUT
3.3Vout
ceramic 100mW ESR capacitor tantalum capacitor * See values for recommended external input capacitance. Inductor optional as needed.
C*
22 F
100 F
5.0Vout
Figure 13: Test set-up diagram showing measurement points for Input Reflected Ripple Current (Figure 14), Input Terminal Ripple Voltage (Figure 15), and Output Voltage Ripple (Figure 16).
Figure 14: Input Reflected Ripple Current, is, through a 1 H source inductor at nominal input voltage and rated load current (100 mA/div). See Figure 13.
0.9Vout
0.9Vout
1.8Vout 1.8Vout
3.3Vout 3.3Vout
5.0Vout
5.0Vout
Figure 15: Input Terminal Ripple Voltage at nominal input voltage and rated load current (200 mV/div). Load capacitance: 22 F ceramic cap and 100 F tantalum cap. Bandwidth: 20 MHz. See Figure 13.
1
Figure 16: Output Voltage Ripple at nominal input voltage and rated load current (50 mV/div). Load capacitance: 22 F ceramic cap and 100 F tantalum cap.. Bandwidth: 20 MHz. See Figure 13.
0 -10
Forward Transmission (dB)
Output Impedance (ohms)
0.1
-20 -30 -40 -50 -60 -70 -80 -90 5 Vout 2.5 Vout 1.5 Vout 1,000 10,000 100,000 1,000,000
0.01
0.001 5 Vout 2.5 Vout 1.5 Vout 0.0001 10 100 1,000 10,000 100,000
100
Hz
Hz
Figure 17: Magnitude of incremental output impedance (Zout = vout/iout) for nominal input voltage at full rated power with 100 F tantalum output capacitor.
Product # NQ16W50SKA10 Phone 1-888-567-9596
Figure 18: Magnitude of incremental forward transmission (FT = vout/vin) for nominal input voltage at full rated power with 100 F tantalum output capacitor.
Doc.# 005-NS15W10 Rev. A 11/26/07 Page 7
www.synqor.com
Technical Specification
5 0
100
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
Reverse Transmission (dB)
-5 -10 -15 -20 -25 -30 -35 -40 -45 10 100 1,000 10,000 100,000 1,000,000 5 Vout 2.5 Vout 1.5 Vout
10
Input Impedance (ohms)
1
0.1
0.01 5 Vout 2.5 Vout 1.5 Vout 0.0001 10 100 1,000 10,000 100,000
0.001
Hz
Hz
Figure 19: Magnitude of incremental reverse transmission (RT = iin/iout) for nominal input voltage at full rated power with 100 F tantalum output capacitor.
Figure 20: Magnitude of incremental input impedance (Zin = vin/iin) for nominal input voltage at full rated power with 100 F tantalum output capacitor.
Product # NQ16W50SKA10
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Doc.# 005-NS15W10 Rev. A
11/26/07
Page 8
Technical Specification
BASIC OPERATION AND FEATURES
The NiQor series non-isolated converter uses a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The NiQor modules employ synchronous rectification for very high efficiency. Dissipation throughout the converter is so low that it does not require a heatsink or metal baseplate for operation. The NiQor converter can thus be built more simply and reliably using high yield surface mount techniques on a single PCB substrate. The NiQor series of SIPs and SMT converters uses the established industry standard footprint and pin-out configurations.
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
For a desired increase of the nominal output voltage, the value of the resistor should be:
Rtrim-up =
10500 VDES - 0.7525 or
_ 1000 (W)
VOUT = 0.7525 +
10500 Rtrim-up + 1000
(W)
where
VDES = Desired Output Voltage
CONTROL FEATURES
REMOTE ON/OFF: The ON/OFF input permits the user to control when the converter is on or off. There are currently two options available for the ON/OFF input described in the table below. Others may become available if demand exists.
Pin-Open Float Voltage 5 0 Pin-Open Converter State On On
To maintain the accuracy of the output voltage over load current, it is vital that any trim-up resistor be terminated directly to the converter's ground foot, not at the connection to the load. A separate Kelvin connection to the PCB pad for the ground foot is optimal. Trim-down resistors should be terminated at the converter's Sense+ pin. We do not recommend bypassing the trim pin directly to ground with a capacitor. The voltage gain from the trim pin to output is rather large, 15:1. Ground bounce through a bypass capacitor could introduce significant noise to the converter's control circuit.
Option P Logic O Logic
Description Positive/Open Negative/Open
Pin Action Pull Low = Off Pull High = Off
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. Output Current Limiting: To provide protection in an output over load fault condition, the unit is equipped with internal overcurrent protection. When the over-current protection is triggered, the unit enters hiccup mode. The units operate normally once the fault condition is removed.
OUTPUT VOLTAGE TRIM: The TRIM input permits the user to adjust the output voltage according to the trim range specifications by using an external resistor. If the TRIM feature is not being used, leave the TRIM pin disconnected. TRIM-UP: To increase the output voltage from the nominal setpoint of 0.7525V using an external resistor, connect the resistor Rtrim-up between the TRIM and the Ground pin according to the diagram below.
Vout Sense+
Vin
On/Off Gnd
Trim
Rtrim-up
Internal Over-Voltage Protection: To fully protect from excessive output voltage, the NQ16 series contains an Output Over-Voltage Shutdown circuitry. This OVP is independent of the trimmed setpoint. As such, the converter's load is protected from faults in the external trim circuitry (such as a trim pin shorted to ground). Since the setpoint of this OVP does not track trim, it is set at 6.0V, in the wide-trim W50 model.
Product # NQ16W50SKA10
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Doc.# 005-NS15W10 Rev. A
11/26/07
Page 9
Technical Specification
The shutdown point is fixed on standard option. SKA also offers adjustable OVP set point. For more detailed information contact SynQor technical support. 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 OverTemperature 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.
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
put of the SKA10 series of converters. The VMA16 series has this capacitance included internally. In many applications, however, additional external output capacitance is required to reduce the response to load transients to an allowable level. The output impedance of these converters can be quite accurately modeled from DC to about 100kHz as shown in Figure F. A further simplified version of it, valid below 40Hz and above 1kHz, is shown in Figure G. In the Figure F: NQ16 Passive Output Model SKA10 case, the models depict the minimum recommended output capacitance, Ct with its resistance Rt. In the VMA16 family, that capacitor is again included in the converter. If the dynamic characteristics of the load are known, any standard simulator can use these models to predict the in-circuit transient response.
APPLICATION CONSIDERATIONS
Input Filtering/Capacitance/Damping: The filter circuit of Figure E is often added to the converter's input to prevent switching noise from reaching the input voltage bus.
Figure E: NQ16 converter with Input Filter
In the SKA10 (surface mount) converters Cin = 30F of high quality ceramic capacitors. With Lin of 1H, Cd should be 100200F and Rd should be 0.1-0.2W, in most applications. For more information on designing the input filter and choosing proper values, contact SynQor technical support. Adding significant external pure ceramic capacitance directly across the converter's input pins is not recommended. Parasitic inductance associated with the input pin geometry and PCB traces can create a high-Q CLC circuit with any external capacitors. Just a few nano-Henries of parasitic inductance can create a resonance (or an overtone) near the converter's switching frequency. Cin has a reactance of 10-20mW at the 300kHz switching frequency. To avoid this high-frequency resonance, any external input filter should exhibit a net source impedance of at least 20mW resistive through this frequency range. This requirement is easily met with the damping elements discussed above. Adding a small amount (a few F) of high-frequency external ceramic will not violate it. If using converters at higher powers, consider the ripple current rating of Cd. Contact SynQor technical support for details. Output Capacitance: It is recommended to add at least 100F of capacitance, with an ESR in the 0.1W range, to the outProduct # NQ16W50SKA10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-NS15W10 Rev. A
Figure G: Simplified NQ16 Output Model
Figure H: Converter with Additional Output Capacitance
For minimal overshoot upon recovery, Cd should be related to the minimum in-circuit net ESR. parallel (L1, L2) Cd > ESRdmin2 For more detailed derivations of these values contact SynQor technical support.
11/26/07
Page 10
Technical Specification
Thermal Performance (SKA10): While impossible to be exact, a simplified thermal model for the mounted converter is detailed below.
Input: Outputs: Current: Package:
6.0 - 16.0V 0.75 - 5.0V 10A SMT
SURFACE MOUNT INFORMATION
PCB Layout Considerations: SynQor recommends that the customer use a non-solder mask defined pad design. The minimum recommended pad size is 0.074" x 0.122" (1.88mm x 3.1mm) and the maximum pad size is 0.095" x 0.140" (2.41mm x 3.56mm), see the mechanical diagram on page 2. Interconnection to internal power planes is typically required. This can be accomplished by placing a number of vias between the SMT pad and the relevant plane. The number and location of the vias should be determined based on electrical resistance, current and thermal requirements. "Via-in-pad" design should be avoided in the SMT pads. Solder mask should be used to eliminate solder wicking into the vias. Pick and Place: The NiQor surface mount modules are designed for automated assembly using standard SMT pick and place equipment. The modules have a centrally located inductor component with a flat surface area to be used for component pick-up. The units use open frame construction and have a low mass that is within the capability of standard pick and place equipment. Those modules however have a larger mass than most conventional SMT components and so variables such as nozzle size, tip style, handling speed, and placement pressure should be optimized for best results. A conformal tipped placement nozzle design is recommended. Coplanarity of better than 0.004" (0.1mm) is achieved through the SMT NiQor's terminal design.
Figure I: Thermal Model for NQ16 Surface Mount
* Rt_J-Pcb models the conduction of heat from the converter's
hottest junction to the converter's PCB at large. It is about 3oC/W for converters running at higher output voltage, and about 4oC/W for lower voltage converters.
* Rt_Pcb-Amb models the power dissipation from converter PCB
to the air stream. It ranges from about 15oC/W at 400LFM to about 25oC/W 100LFM. PCB though its mounting feet; it is about 3oC/W.
* Rt_Pcb-Feet expresses the thermal path from the converter's * Rt_spread models the heat spreading on the PCB to which the
converter is mounted and is largely dependent upon the construction and layout of that PCB.
* T_mount is the temperature of that PCB in the greater vicinity of
the converter. As is evident, the values for Rt_spread and T_mount will have great effect upon the thermal operation of the converter. With Rt_Pcb-Amb being 5 to 8 times as large as Rt_Pcb-Feet, in most applications these converters will be predominantly cooled via thermal conduction through their feet. Airflow and T_Amb will have only a minimal cooling effect.
* Rt_spread should be minimized. Attach the converter to large
copper planes, on multiple layers, with multiple vias near the mounting feet.
* T_mount should also be minimized. Place the converter far
enough away from other sources of heat on the PCB so that it is as cool as practical.
* If operation near derating limits is even suspected, thermal performance should be verified with the unit mounted in its intended manner and powered in circuit with all neighboring circuitry active. Attach a thermocouple to the converter's hotspot as shown in Figures 4, 6, and 8 in the Performance Curves section.
Product # NQ16W50SKA10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-NS15W10 Rev. A 11/26/07 Page 11
Technical Specification
Input: Outputs: Current: Package:
o
6.0 - 16.0V 0.75 - 5.0V 10A SMT
Reflow Soldering Guidelines: Figure J Maximum Temperature (+210-260 C) shows a typical reflow profile for a eutectic solder process. Due to variations in customer applications, materials and processes, it is not Eutectic Solder Melting Point (+183 C) feasible for SynQor to recommend a specific reflow profile. The customer should use this profile as a guideline only. Since the NiQor sur(+150-155 C) face mount modules have a larger thermal mass and lower thermal resistance than standard Pre-heat Reflow Cool Down Soak SMT components, it may be necessary to optimize the solder reflow profile based on limita* 0.5-0.6 C/sec * 1.3-1.6 C/sec tions of the other components on the customer * 60 to 90 sec., * 30 to 60 sec., typ., * < 2.5 C/sec typ., 2 min max 90 sec max board. Sufficient reflow time must be allowed to fuse the plating on the connection to ensure a reliable solder joint. The solder reflow profile 2 to 4 min. should be confirmed by accurately measuring the SMT interconnect leads. Maximum case temperature of 260C (exposure for 5 seconds Figure J: Typical Eutectic (96.5Sn/3.0Ag/0.5Cu) Solder Profile or less) is not exceeded for the NiQor units. RoHS Compliance: The EU led RoHS (Restriction of Moisture Sensitivity: The NiQor surface mount modules have Hazardous Substances) Directive bans the use of Lead, an MSL rating 1 per IPC/JEDEC J-STD-033A. Cadmium, Hexavalent Chromium, Mercury, Polybrominated Cleaning and Drying: When possible, a no-clean solder Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE) in paste system should be used to solder the NiQor SMT units to Electrical and Electronic Equipment. This SynQor product is 6/6 their application board. The modules are suitable for aqueous RoHS compliant. For more information please refer to SynQor's washing, however, the user must ensure sufficient drying to RoHS addendum available at our RoHS Compliance / Lead Free remove all water from the converter before powering up. Initiative web page or e-mail us at rohs@synqor.com. Inadequate cleaning and drying can affect the reliability of the converter and the testing of the final assembly.
o o o o o
Product # NQ16W50SKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-NS15W10 Rev. A
11/26/07
Page 12
Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's NiQor DC/DC converters follows the format shown in the example below.
NQ 16 W50 S K A 10 P S S - G 6/6 RoHS Options (see Ordering Information) Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family
Input: Outputs: Current: Package:
ORDERING INFORMATION
6.0 - 16.0V 0.75 - 5.0V 10A SMT
The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. A "-G" suffix indicates the product is 6/6 RoHS compliant.
Model Number NQ16W50SKA10xyz -G Input Voltage 6.0 - 16.0 V Output Max Output Voltage Current 0.75-5.0 V 10 A
The following option choices must be included in place of the x y z spaces in the model numbers listed above.
Options Description: x y z
Enable Logic Pin Style Feature Set
The first 12 characters comprise the base part number and the last 3 characters indicate available options. A "-G" suffix indicates the product is 6/6 RoHS compliant.
P - Pos./Open S - Standard O - Neg./Open
S - Sense N - None
Application Notes
A variety of application notes and technical white papers can be downloaded in pdf format from our website.
PATENTS (additional patent applications may be filed)
SynQor holds the following patents, one or more of which might apply to this product: 5,999,417 6,594,159 6,927,987 6,222,742 6,731,520 7,050,309 6,545,890 6,894,468 7,072,190 6,577,109 6,896,526 7,085,146
Contact SynQor for further information:
Phone: Toll Free: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 power@synqor.com www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA
Phone 1-888-567-9596
Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor.
Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor.
Doc.# 005-NS15W10 Rev. A 11/26/07 Page 13
Product # NQ16W50SKA10
www.synqor.com

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