10A

Technical
Specification
NQ16W50xKA10
6.0-16.0V
0.75-5.0V
10A
Non
SIP
Input
Outputs
Current
Isolated
Single Inline Pins
The NiQor SMT DC/DC converter is a non-isolated buck
regulator, which employs synchronous rectification to
achieve extremely high conversion efficiency. The
NiQor family of converters are used predominately in
DPA systems using a front end DC/DC high power brick
(48Vin to low voltage bus). The non-isolated NiQor
converters are then used at the point of load to create
the low voltage outputs required by the design. The
wide trim module can be programmed to a variety of
output voltages through the use of a single external
resistor. RoHS compliant (see page 13).
Non-Isolated
NiQor wide trim module
Operational Features
•Ultra high efficiency, up to 95% 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
Mechanical Features
•DOSA standard pin-out configuration
•Industry standard size: 2” x 0.5” x 0.288”
(50.8 x 12.7 x 7.32 mm)
•Total weight: 0.3 oz. (9.4 grams), lower mass greatly reduces
vibration and shock problems
•Open frame construction maximizes air flow cooling
•Also available in SMT packaging
Control Features
•On/Off control
•Output voltage trim (industry standard) permits custom voltages
and voltage margining
•Remote Sense (standard option)
Product # NQ16W50xKA10
Phone 1-888-567-9596
www.synqor.com
Protection 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
Safety Features
•UL 60950-1:2007
•CAN/CSA-C22.2 No. 60950-1-07
•EN60950-1/A1:2010
•RoHS compliant (see page 13)
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 1
Input:
Outputs:
Current:
Package:
Technical Specification
MECHANICAL
DIAGRAM
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
Vertical Mount
Side View
Front View
0.288
2.00
(7.32)
(50.8)
0.315 Max
0.185
(8.0 Max)
(4.7)
0.197 Max
(5.0 Max)
0.500
0.050 Ref.
(12.70)
1
2
3
4
5
A
6
7
8
(1.27)
0.160
9 10 11
(4.06)
0.050
0.040 PCB Ref.
(1.27)
(1.02)
0.120
(3.05)
0.025 + 0.003
0.000
(0.00)
0.100
(2.54)
0.200
(5.08)
0.300
(7.62)
0.400
(10.16)
1.300
(33.02)
1.400 1.500 1.600 1.700 1.800
(35.56) (38.10) (40.64) (43.18) (45.72)
NOTES
(0.64 + 0.076)
1.900
SQ. Typ.
(48.26)
PIN DESIGNATIONS
1) All pins are 0.025” (0.64mm) +0.003 (0.076mm) square.
2) All Pins: Material - Copper Alloy
Finish - Tin over Nickel plate
3) Vertical, horizontal, vertical with reverse pins and surface
mount options (future) available.
4) Undimensioned components are shown for visual
reference only.
6) All dimensions in inches (mm)
Tolerances: x.xx +0.02 in. (x.x +0.5mm)
x.xxx +0.010 in. (x.xx +0.25mm)
7) Weight: 0.30 oz. (9.4 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
Pin Connection Notes:
1. Pin 10 - for fixed resistors, connect between Trim and
Common (Ground).
2. Pin 11 - see section on Remote ON/OFF pin for
description of enable logic options.
Pin No.
Name
Function
1
Vout(+)
Positive output voltage
2
Vout(+)
Positive output voltage
3
SENSE(+)
Positive remote sense
4
Vout(+)
Positive output voltage
5
Common
A
N/C
6
Common
7
Vin(+)
Positive input voltage
8
Vin(+)
Positive input voltage
9
N/C
No Connection
10
TRIM1
Output voltage trim (trim-up only)
11
ON/OFF2
LOGIC input to turn the converter
on and off.
No Connection
Pins in Italics Shaded text are Optional
Product # NQ16W50xKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 2
Input:
Outputs:
Current:
Package:
Technical Specification
MECHANICAL
DIAGRAM
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
Horizontal Mount
Front View
Side View
0.288
2.00
(7.32)
(50.8)
0.315 Max
0.185
(8.0 Max)
(4.7)
0.197 Max
(5.0 Max)
0.025 + 0.003
0.550
(0.64 + 0.076)
(13.97)
1
2
3
4
5
A
6
7
8
9
0.050 Ref.
SQ. Typ.
10 11
(1.27)
0.128 Min
0.050
0.040 PCB Ref.
(3.25 Min)
(1.27)
(1.02)
0.330
(8.38)
0.000
(0.00)
0.100
(2.54)
0.200
(5.08)
0.300
(7.62)
0.400
(10.16)
1.300
(33.02)
1.400 1.500 1.600 1.700 1.800
(35.56) (38.10) (40.64) (43.18) (45.72)
1.900
(48.26)
See previous page for notes and pin designations.
Product # NQ16W50xKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 3
Input:
Outputs:
Current:
Package:
Technical Specification
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
ELECTRICAL CHARACTERISTICS - NQ16W50xKA10 Series
TA=25°C, airflow rate=300 LFM, Vin=12Vdc unless otherwise noted; full operating temperature range is -40°C to +105°C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Module
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
All
Operating
All
Operating Temperature
All
Storage Temperature
All
Voltage at ON/OFF input pin
All
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
All
Input Fuse Rating
All
External Input Capacitance
All
Output Voltage
All
Output Current
All
INPUT CHARACTERISTICS
Input Under-Voltage Lockout
Turn-On Voltage Threshold
All
Turn-Off Voltage Threshold
All
Lockout Hysteresis
All
Maximum Input Current
0.75V
“
2.5V
“
5.0V
No-Load Input Current
0.75V
“
2.5V
“
5.0V
Disabled Input Current
All
Inrush Current Transient Rating
All
Input Filter Capacitor Value
All
Input Reflected-Ripple Current
0.75V
“
2.5V
“
5.0V
OUTPUT CHARACTERISTICS
Output Voltage Set Point
0.75V
Output Voltage Range
All
Operating Output Current Range
All
Output Voltage Regulation
Over Line
All
Over Load
All
Over Temperature
All
Total Output Voltage Range
All
life
Output Voltage Ripple and Noise (pk-pk\RMS) 1.0V
“
2.5V
“
5.0V
Output DC Over Current Shutdown
All
External Output Capacitance
All
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
All
Output Voltage during Current Transient
For a Step Change in Output Current (0.1A/µs) All
For a Step Change in Output Current (3A/µs)
All
Settling Time
All
Turn on Transient
Inhibit Time
All
Rise Time
All
Output Voltage Overshoot
All
EFFICIENCY
100% Load
0.75V
“
2.5V
“
5.0V
50% Load
0.75V
“
2.5V
“
5.0V
Product # NQ16W50xKA10
Phone 1-888-567-9596
Min.
Typ.
Max.
0
-40
-55
-3
18
16
105
125
15
V
V
°C
°C
V
6
100
0.75
0
16
20
5.5
10
V
A
µF
V
A
5.35
4.50
5.73
4.73
1
31
71
132
3
30
36
68
98
6.10
4.95
1.6
4.5
8.6
0.1
V
V
V
A
6Vin, 100% load
A
“
A
“
mA
12Vin
mA
“
mA
“
mA
A2s
With min. output capacitance
µF
mA
12Vin, 100% load, pk-pk value
mA “
mA “
0.745
0.75
0
0.75
0.755
5.0
10
V
V
A
12Vin 50% load
Set output by Rtrim-up
0.5
0.5
1
3
%
%
%
%
With sense pin
“
“
With sense pin, over sample, line, load, temp. &
12
0
35\9.0
55\15.0
87\25.0
19
24
5000
mV
mV
mV
A
µF
Full load; 20MHz bandwidth
“
“
50
dB
120Hz
180
180
100
mV
mV
µs
50%-75%-50% Iout max; 100uF
50%-75%-50% Iout max; 470uF
To within 1.5% Vout nom.
2
2
4
6
0
ms
ms
V
Resistive load
“
“
77.0
91.0
95.0
81.0
90.5
94.5
%
%
%
%
%
%
www.synqor.com
Units Notes & Conditions
Continuous
Continuous
Fast blow external fuse recommended
ESR<1.5W
>0.5mW
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 4
Input:
Outputs:
Current:
Package:
Technical Specification
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
ELECTRICAL CHARACTERISTICS (continued) - NQ16W50xKA10 Series
Parameter
Module
Min.
Typ.
Max.
All
All
125
125
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
All
275
300
325
kHz
Half on small duty cycle (e.g. 16Vin;
All
All
All
All
All
All
All
All
All
All
All
1.5
-3.0
-0.2
2.2
0.75
5.6
6.5
V
0.6
V
20
kW
1.0
V
Vin
V
Vin
V
20
kW
5.5
V
6.0
6.4
V
128
°C
10°C
All
All
All
TEMP LIMITS FOR POWER DERATING
Semiconductor Junction Temperature
Board Temperature
FEATURE CHARACTERISTICS
Switching Frequency
0.75Vout)
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
15.6
10.0
Units Notes & Conditions
See Figure A
Open collector/drain input; see Figure A
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
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:2007
Basic insulation
CAN/CSA-C22.2 No. 60950-1:2007
EN60950-1:A1:2010
IEC 61000-4-2
ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new
releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
# Units
32
5
5
10
5
5
5
15 pins
OPTIONS
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x, y and z axis
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
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.
Product # NQ16W50xKA10
Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents. Please consult the
last page for further details.
www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 5
Input:
Outputs:
Current:
Package:
Technical Specification
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
Figure 1: Efficiency at nominal output voltage vs. load current for
nominal input voltage at 25°C.
Figure 2: Power dissipation at nominal output voltage vs. load current
for nominal input voltage at 25°C.
Figure 3: Maximum output power derating curves for 0.75Vo, 1.2Vo,
1.5Vo units under various thermal conditions and nominal input voltage.
Figure 4: Thermal plot of 0.75Vo, 1.2Vo converters at nominal Vin and
10 amp load current mounted on a 85°C, 6-Layer, 2 oz. copper board
(typical installation).
Figure 5: Maximum output power derating curves for 1.8Vo, 2.5Vo
units under various thermal conditions and nominal input voltage.
Figure 6: Thermal plot of 1.8Vo, 2.5Vo converters at nominal Vin and
10 amp load current mounted on a 70°C, 6-Layer, 2 oz. copper board
(typical installation).
Product # NQ16W50xKA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 6
Input:
Outputs:
Current:
Package:
Technical Specification
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 7: Maximum output power derating curves for 3.3Vo, 5.0Vo
units under various thermal conditions and nominal input voltage.
Figure 8: Thermal plot of 3.3Vo, 5.0Vo converters at nominal Vin and
10 amp load current mounted on a 70°C, 6-Layer, 2 oz. copper board
(typical installation).
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)
Figure 11: Output voltage response for 0.9V, 1.8V, 5V units to step-change
Figure 12: Output voltage response for 0.9V, 1.8V, 5V units to step-change in
in load current (50-75-50% of Iout max; di/dt=0.1A/µs). Load cap: 100µF,
100mW ESR tant, 10µF cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (100mV/div).
Product # NQ16W50xKA10
Phone 1-888-567-9596
load current (50-75-50% of Iout max; di/dt=3A/µs). Load cap: 470µF, 100mW
ESR tant, 10µF cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (100mV/div).
www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 7
Input:
Outputs:
Current:
Package:
Technical Specification
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
See Fig. 14
1 µH
See Fig. 15
source
impedance
See Fig. 16
iS
VSOURCE
VIN
C*
DC/DC
Converter
VOUT
22 µF
ceramic
capacitor
* See values for recommended external input capacitance. Inductor optional as needed.
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 µH source
inductor at nominal input voltage and rated load current (100 mA/div).
See Figure 13.
Figure 15: Input Terminal Ripple Voltage at nominal input voltage and
rated load current (200 mV/div). Load capacitance: 22µF ceramic cap.
Bandwidth: 20 MHz. See Figure 13.
Figure 16: Output Voltage Ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 22µF ceramic cap.
Bandwidth: 20 MHz. See Figure 13.
Figure 17: Magnitude of incremental output impedance (Zout = vout/
iout) for nominal input voltage at full rated power.
Figure 18: Magnitude of incremental forward transmission (FT = vout/
vin) for nominal input voltage at full rated power.
Product # NQ16W50xKA10
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Doc.# 005-2NK12WE Rev. C
01/16/12
Page 8
Input:
Outputs:
Current:
Package:
Technical Specification
Figure 19: Magnitude of incremental reverse transmission (RT = iin/
iout) for nominal input voltage at full rated power.
Product # NQ16W50xKA10
Phone 1-888-567-9596
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
Figure 20: Magnitude of incremental input impedance (Zin = vin/iin)
for nominal input voltage at full rated power.
www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 9
Input:
Outputs:
Current:
Package:
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.
For a desired increase of the nominal output voltage, the value
of the resistor should be:
Rtrim-up
=
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.
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
Rtrimup
10500
VDES - 0.7525
_ 1000 (W)
or
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.
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
VOUT = 0.7525 +
where
10500
Rtrim-up + 1000
(W )
VDES = Desired Output Voltage
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.
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
over-current protection. When the over-current protection is
triggered, the unit enters hiccup mode. The units operate normally once the fault condition is removed.
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 # NQ16W50xKA10
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www.synqor.com
Doc.# 005-2NK12WE Rev. C
01/16/12
Page 10
Input:
Outputs:
Current:
Package:
Technical Specification
The shutdown point is fixed on standard option. These converters also offer 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
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.
APPLICATION CONSIDERATIONS
Input and Output Filtering: SynQor recommends an external
input capacitor of either a tantalum, polymer or aluminum
electrolytic type on the input of the NQ16 series non-isolated
converters. This capacitance and resistance primarily provides
damping of the input filter, reduces the source impedance and
guarantees input stability (see SynQor application note “Input
System Instability”). The input filter is formed by any source or
wiring inductance and the converter’s input capacitance. The
external capacitance also provides an additional benefit of
ripple voltage reduction.
A modest sized capacitor would suffice in most conditions,
such as a 330µF, 16V tantalum, with an ESR of approximately
50 mW. The NiQor family converters have an internal ceramic
input capacitor to reduce ripple current stress on the external capacitors. An external ceramic capacitor of similar size
(330µF) with a series resistor of approximately 50 mW would
also suffice and would provide the filter damping.
Additional ceramic capacitance may be needed on the input,
in parallel with the tantalum capacitor, to relieve ripple current
stress on the tantalum capacitors. The external capacitance
forms a current divider with the 40µF internal ceramic capacitance. At 300 kHz., the impedance of the internal capacitance
is about 15mW capacitive. At that frequency, an SMT 330µF
tantalum capacitor would have an impedance of about 50mW
resistive, essentially just the ESR.
In this example, at full load, that would stress the tantalum input
capacitor to about 3A rms ripple current, possibly beyond its
rating. Placing an additional 40µF of ceramic in parallel with
that capacitor would reduce the ripple current to about 1.5A,
probably within its rating at 85oC. The input ripple current is
proportional to load current, so this example should be scaled
down according to the actual load current.
Additional input capacitance equal to half of the output capacitance is recommended when operating with more than 1000uF
of output capacitance on lower voltage outputs when trimming
down by more than half of the trim-down allowance (e.g., further than -2.5% on a 0.9V, or -5% on a 1.2V).
Product # NQ16W50xKA10
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6.0 - 16.0V
0.75 - 5.0V
10A
SIP
Input inductance should be reduced for maintaining input
stability when operating with large output capacitance
(>1000µF). Reducing input inductance to <0.3µH provides
for good phase margin with up to the 4000µF maximum output
capacitance. If the input inductance must be increased up to
1µH even with large output capacitance (>1000µF), an input
capacitance equal to or greater than the output capacitance
may be needed to compensate the input impedance.
If no inductor is used to isolate the input ripple of the NiQor
converters from the source or from inputs of other NiQor
converters, then this external capacitance might be provided
by the DC/DC converter used as the power source. SynQor’s
PowerQor series converters typically have tantalum and
ceramic output capacitors that would provide the damping.
An input inductor would help isolate the ripple currents and
voltages from the source or other NiQor style converters
on the voltage supply rail. If an input inductor is used, the
recommended capacitance should guarantee stability and
control the ripple current for up to 1.0µH of input inductance.
The input inductor need not have very high inductance. A
value of 250 nanohenries would equate to almost 500 miliohm
of series impedance at the switching frequency of 300 kHz. This would be working against an assumed capacitive ESR of
30mW on the supply side of the inductor, providing significant
isolation and ripple reduction.
No external capacitance is required at the output, however,
the ripple voltage can be further reduced if ceramic and
tantalum capacitors are added at the output. Since the
internal output capacitance is about 50µF, approximately
that amount of ceramic capacitance would be needed
to produce a noticeable reduction in output ripple. The
value of the tantalum capacitors is both to provide a high
capacitance for pulsed loads and to provide damping of the
distribution network with their inherent ESR, which is low, but
higher than ceramics. Additional output capacitance in the
range of 300-500µF is beneficial for reducing the deviation
in response to a fast load transient.
Input Over-Voltage Prevention: The power system designer
must take precautions to prevent damaging the NiQor converters by input overvoltage. This is another reason to be careful
about damping the input filter so that no ringing occurs from
an underdamped filter. The voltage must be prevented from
exceeding the absolute maximum voltage indicated in the
Electrical Specifications section of the data sheet under all
conditions of turn-on, turn-off and load transients and fault
conditions. The power source should have an over voltage
shutdown threshold as close as reasonably possible to the
operating point.
Additional protection can come from additional input
capacitance, perhaps on the order of 1,000µF, but contingent
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Input:
Outputs:
Current:
Package:
Technical Specification
on the source inductance value. A large source inductance
would require more capacitance to keep the input voltage
below the absolute maximum, if the load current were
interrupted suddenly. This can be caused by either a shutdown
of the NiQor from a fault or from the load itself, for example
when a card is hot-swapped out, suddenly dropping the load
to zero. This is further justification for keeping the source
inductance low, as mentioned above. When the power source
is configured with remote sensing, the series resistance of the
filter inductor and any other conductors or devices between the
source and the sense point will result in a voltage drop which,
in the event of a load current interruption, would add to the
NiQor input voltage.
A TVS device could also be used to clamp the voltage level during these conditions, but the relatively narrow range between
operating voltage and the absolute maximum voltage restrict
the use of these devices to lower source current levels that will
not drive the transient voltage suppressor above the voltage
limit when all the source current is flowing into the clamp. A
TVS would be a good supplemental control, in addition to careful selection of inductance and capacitance values.
Equivalent Model for Input Ripple: A simple but reasonably
accurate model of input ripple is to treat the NiQor input as a
pulsed AC current source at 300 kHz.in parallel with a very
low ESR capacitor, see Figure E. The peak-to-peak current of
the source model is equal to the NiQor load current, representing the peak current in the NiQor’s smoothing choke. The
capacitor represents the 40µF input ceramic capacitance of
the NiQor converter, with a nearly negligible ESR of less than
1 mW. A further refinement can be made by setting the duty
cycle of the pulsed source to the output voltage divided by the
input voltage.
The only error in this simplified model is that it ignores the
ripple current in the choke, usually less than 20% of the load
current, and it ignores the resistive losses inside the NiQor converter, which would alter the duty cycle very slightly.
The model is a good guide for calculating the effects of external input capacitors and other filter elements on ripple voltage
and ripple current stress on capacitors.
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
30µF
I p-p
INPUT
<1mW
I p-p = I Load
Figure E: Equivalent model for input ripple
OPTIONAL FEATURES
REMOTE SENSE(+) (Pin 3 - Optional): The optional SENSE(+)
input corrects for voltage drops along the conductors that connect the converter’s output pins to the load.
Pin 3 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(+) – SENSE(+) < Sense Range % x Vout
Pin 3 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 higher than its specified
value.
Note: the output over-voltage protection circuit senses the voltage across the output (pins 1, 2 and 4) to determine when it
should trigger, not the voltage across the converter’s sense
lead (pin 3).
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 [email protected]
Layout Suggestion: When using a fixed output NiQor converter, the designer may chose to use the trim function and would
thus be required to reserve board space for a trim resistor.
It is suggested that even if the designer does not plan to use
the trim function, additional space should be reserved on the
board for a trim resistor. This will allow the flexibility to use the
wide output voltage trim range NiQor module at a later date.
Any trim resistor should connect to the ground or output node
at one of the respective pins of the NiQor, so as to prevent
the trim level from being affected by load drops through the
ground or power planes.
Product # NQ16W50xKA10
Phone 1-888-567-9596
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Doc.# 005-2NK12WE Rev. C
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Input:
Outputs:
Current:
Package:
Technical Specification
6.0 - 16.0V
0.75 - 5.0V
10A
SIP
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s NiQor DC/DC
converters follows the format shown in the example below.
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant.
N Q 1 6 W5 0 V K A 1 0 P R S -G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Thermal Design
Performance Level
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
NQ16W50pKA10xyz-G
6.0 - 16V
0.75 - 5.0V
10A
The following option choices must be included in place of
the x y z spaces in the model numbers listed above.
Package Size
Output Voltage
Packaging: p
Input Voltage
Product Family
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.
Options Description: xyz
Packaging
Enable Logic
Pin Style
V- Vert Mount SIP
H- Horiz. Mount SIP
P- Pos./Open
O- Neg./Open
R - 0.160"
(Standard)
Feature Set
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
SynQor holds the following U.S. patents, one or more of which apply to
each product listed in this document. Additional patent applications may
be pending or filed in the future.
5,999,417
6,222,742
6,545,890
6,577,109
6,594,159
6,731,520
6,894,468
6,896,526
6,927,987
7,050,309
7,072,190
7,085,146
7,119,524
7,269,034
7,272,021
7,272,023
7,558,083
7,564,702
7,765,687
7,787,261
8,023,290
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # NQ16W50xKA10
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
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.
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Doc.# 005-2NK12WE Rev. C
01/16/12
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