NQ16W50SMA16PSS-G [SYNQOR]
SMT Surface Mount; SMT表面贴装
| 型号： | NQ16W50SMA16PSS-G |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | SMT Surface Mount |
| 文件： | 总13页 (文件大小：510K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Technical
Specification
NQ16W50SMA16
6.0-16.0V
Input
0.75-5.0V
Outputs
16 Amp
Current
Non
Isolated
SMT
Surface Mount
®®
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aacchhiieevvee eexxttrreemmeellyy hhiigghh ccoonnvveerrssiioonn eeffffiicciieennccyy.. TThhee NNiiQQoorr
ffaammiillyy ooff ccoonnvveerrtteerrss aarree uusseedd pprreeddoommiinnaatteellyy iinn DDPPAA ssyysstteemmss
uussiinngg aa ffrroonntt eenndd DDCC//DDCC hhiigghh ppoowweerr bbrriicckk ((4488VViinn ttoo llooww
vvoollttaaggee bbuuss)).. TThhee nnoonn--iissoollaatteedd NNiiQQoorr ccoonnvveerrtteerrss aarree tthheenn
uusseedd aatt tthhee ppooiinntt ooff llooaadd ttoo ccrreeaattee tthhee llooww vvoollttaaggee oouuttppuuttss
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ggrraammmmeedd ttoo aa vvaarriieettyy ooff oouuttppuutt vvoollttaaggeess tthhrroouugghh tthhee uussee ooff
aa ssiinnggllee eexxtteerrnnaall rreessiissttoorr.. RRooHHSS ccoommpplliiaanntt ((sseeee ppaaggee 1122))..
Non-Isolated
NiQor surface mount module
Operational Features
• Ultra high efficiency, up to 94% at full rated load
• Delivers up to 16 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
Protection Features
• No minimum load requirement means no preload resis-
• Input under-voltage lockout disables converter at low
input voltage conditions
tors required
• Temperature compensated over-current shutdown pro-
tects converter from excessive load current or short cir-
cuits
Mechanical Features
• Output over-voltage protection protects load from dam-
• 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)
aging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
• Total weight: 0.18 oz. (5 grams), lower mass great-
ly 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
Control Features
• Meets 72/23/EEC and 93/68/EEC directives which
facilitates CE Marking in user’s end product
• On/Off control
• Board and plastic components meet UL94V-0 flammabil-
ity requirements
• Output voltage trim (industry standard) permits custom
voltages and voltage margining
• Remote Sense (standard option)
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 1
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
MECHANICAL
DIAGRAM
Surface Mount Package
0.288+.018
(7.32+0.45)
1.30
(33.0)
see Note 4
0.025
(0.64)
1
2
3
4
5
0.075
(1.91)
0.063
(1.60)
0.53
0.405
(13.5)
(10.29)
Typ.
7
6
0.012+.007
(0.3+0.17)
0.297
(7.54)
0.063
(1.6)
Bottomside
Clearance
0.048
(1.22)
0.487
(12.37)
0.100
(2.54)
0.677
(17.20)
Typ.
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
SMT CONTACT DESIGNATIONS
1) SMT Contacts: Material - Brass
Pin No. Name
Function
Finish - Gold over Nickel plate
1
2
3
4
5
6
7
N/C
No Connection
2) Undimensioned components are shown for visual
reference only.
GND
Ground
3) All dimensions in inches (mm)
Vout(+)
TRIM
SENSE(+)
Vin(+)
Positive output voltage
Output Voltage Trim
Positive remote sense
Positive input voltage
Input to turn converter on/off
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
ON/OFF
Pins in Italics Shaded text are Optional
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 2
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
ELECTRICAL CHARACTERISTICS - NQ16W50SMA16 Series
TA=25°C, airflow rate=300 LFM, Vin=12Vdc unless otherwise noted; full operating temperature range is -40°C to +105°C ambient tem-
perature with appropriate power derating. Specifications subject to change without notice.
Parameter
Module
Min.
Typ.
Max.
Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
All
All
All
All
All
0
18
16
105
125
15
V
V
Continuous
Continuous
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
Input Fuse Rating
-40
-55
-3
°C
°C
V
All
All
All
All
All
6
16
20
V
A
Fast blow external fuse recommended
ESR<1.5Ω
External Input Capacitance
Output Voltage
Output Current
100
0.75
0
µF
V
5.5
16
A
INPUT CHARACTERISTICS
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis
All
All
5.35
4.50
5.73
4.73
1
6.10
4.95
V
V
All
V
Maximum Input Current
“
0.75V
2.5V
5.0V
0.75V
2.5V
5.0V
All
All
All
0.75V
2.5V
5.0V
2.8
7.5
14.0
A
6Vin, 100% load
A
“
“
A
“
No-Load Input Current
“
31
71
132
3
mA
mA
mA
mA
12Vin
“
“
“
Disabled Input Current
Inrush Current Transient Rating
Input Filter Capacitor Value
Input Reflected-Ripple Current
“
2
0.1
A s
With min. output capacitance
30
36
68
98
µF
mA
mA
mA
12Vin, 100% load, pk-pk value
“
“
“
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Range
Operating Output Current Range
Output Voltage Regulation
Over Line
0.75V
All
0.745
0.75
0
0.75
0.755
5.0
V
V
A
12Vin 50% load
Set output by Rtrim-up
All
16
All
All
0.5
0.5
1
%
%
With sense pin
Over Load
“
“
Over Temperature
All
%
Total Output Voltage Range
Output Voltage Ripple and Noise (pk-pk\RMS)
“
All
3
%
With sense pin, over sample, line, load, temp. & life
1.0V
2.5V
5.0V
All
27\5.0
43\11.6
67\20.4
24
mV
mV
mV
A
Full load; 20MHz bandwidth
“
“
“
Output DC Over Current Shutdown
External Output Capacitance
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage during Current Transient
20
100
28
5000
All
µF
>0.5mΩ
All
50
dB
120Hz
For a Step Change in Output Current (0.1A/
For a Step Change in Output Current (3A/ s)
µs)
All
All
All
180
180
100
mV
mV
µs
50%-75%-50% Iout max; 100uF
50%-75%-50% Iout max; 470uF
To within 1.5% Vout nom.
µ
Settling Time
Turn on Transient
Inhibit Time
All
All
All
2
2
4
6
0
ms
ms
V
Resistive load
Rise Time
“
“
Output Voltage Overshoot
EFFICIENCY
100% Load
0.75V
2.5V
5.0V
0.75V
2.5V
5.0V
77.0
90.0
94.0
81.0
91.5
94.0
%
%
%
%
%
%
“
“
50% Load
“
“
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 3
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
ELECTRICAL CHARACTERISTICS (continued) - NQ16W50SMA16 Series
Parameter
Module
Min.
Typ.
300
20
Max.
Units Notes & Conditions
TEMP LIMITS FOR POWER DERATING
Semiconductor Junction Temperature
Board Temperature
All
All
125
125
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
FEATURE CHARACTERISTICS
Switching Frequency
All
275
325
kHz
Half on small duty cycle (e.g. 16Vin; 0.75Vout)
See Figure A
ON/OFF Control
Open Logic (O) ON/OFF Control
Off-State Voltage
All
All
All
1.5
-3.0
6.5
0.6
V
V
kΩ
On-State Voltage
Input Resistance
Positive Logic (P) ON/OFF Control
Logic Low Voltage Range
Logic High Voltage Range (internal pullup)
Pull-up Voltage
Open collector/drain input; see Figure A
All
All
All
All
All
All
All
All
-0.2
2.2
1.0
Vin
V
V
V
5
100
Pull-up Resistance
kΩ
V
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
0.75
5.6
5.5
6.4
Measured Vout+ to common pins
Over full temp range
Average PCB Temperature
6.0
128
10
V
°C
°C
6
o
o
All
All
All
15.6
10.0
10 Hrs. TR-NWT-000332; 100% load, 200LFM, 40 C T
a
a
6
10 Hrs. MIL-HDBK-217F; 100% load, 200LFM, 40 C T
6
10 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter
P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950-1
File # E194341
Certified by TUV
EN60950-1
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
Test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
GR-1089-CORE
Section 7 - electrical safety, Section 9 - bonding/grounding
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
# Units Test Conditions
QUALIFICATION TESTING
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
Vibration
5
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in 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 5min./day
MIL-STD-883, method 2003
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
5
10
5
5
5
Solderability
15 pins
•
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
PATENTS
SynQor provides various options for Packaging, Enable Logic, SynQor is protected under various patents. Please consult the
and Feature Set for this family of DC/DC converters. Please con- last page for further details.
sult the last page for information on available options.
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 4
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
100
95
90
85
80
75
70
65
60
6
5
4
3
2
1
0
5.0 Vout
2.5 Vout
0.75 Vout
5.0 Vout
2.5 Vout
0.75 Vout
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for nom-
Figure 2: Power dissipation at nominal output voltage vs. load current
for nominal input voltage at 25 C.
inal input voltage at 25
°C.
°
18
16
14
12
10
8
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
6
4
2
0
Semiconductor junction temperature is
within 1 C of surface temperature
°
0
25
40
55
70
85
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 volt-
age. See Thermal Considerations section for more details.
Figure 4: Thermal plot of 0.75Vo, 1.2Vo converters at nominal Vin and
16 amp load current mounted on a 85
(typical installation).
°C, 6-Layer, 2 oz. copper board
18
16
14
12
10
8
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
6
4
2
0
Semiconductor junction temperature is
within 1 C of surface temperature
0
25
40
55
70
85
°
Ambient Air Temperature (°C)
Figure 5: Maximum output power derating curves for 1.8Vo, 2.5Vo
Figure 6: Thermal plot of 1.8Vo, 2.5Vo converters at nominal Vin and
units under various thermal conditions and nominal input voltage. See
Thermal Considerations section for more details.
16 amp load current mounted on a 70
(typical installation).
°C, 6-Layer, 2 oz. copper board
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 5
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
18
16
14
12
10
8
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
6
4
2
0
Semiconductor junction temperature is
within 1 C of surface temperature
°
0
25
40
55
70
85
Ambient Air Temperature (°C)
Figure 7: Maximum output power derating curves for 3.3Vo, 5.0Vo
Figure 8: Thermal plot of 3.3Vo, 5.0Vo converters at nominal Vin and
units under various thermal conditions and nominal input voltage. See
Thermal Considerations section for more details.
16 amp load current mounted on a 70
(typical installation).
°C, 6-Layer, 2 oz. copper board
5.0Vout
3.3Vout
5.0Vout
3.3Vout
1.8Vout
0.75Vout
1.8Vout
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)
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch 1: ON/OFF input (5V/div)
Ch 2-4: Vout (1V/div)
Ch 2-4: Vout (1V/div)
5.0Vout
2.5Vout
5.0Vout
2.5Vout
1.5Vout
Iout
1.5Vout
Iout
Figure 11: Output voltage response for 1.5V, 2.5V, 5V units to step-change in
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, 100m
ESR tant, 10 F cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (100mV/div).
load current (50-75-50% of Iout max; di/dt=0.1A/
µ
s). Load cap: 100
µ
F,
µ
µ
Ω
100m ESR tant, 10 F cer. Ch 1: Iout (10A/div), Ch 2-4: Vout (100mV/div).
Ω
µ
µ
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 6
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
See Fig. 14
0.9Vout
1.8Vout
1 µH
See Fig. 15
source
impedance
See Fig. 16
DC/DC
Converter
iS
VIN
VOUT
3.3Vout
5.0Vout
VSOURCE
100 µF
22 µF
C*
ceramic
100mΩ ESR
capacitor
tantalum
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, i , through a 1 µH source
s
inductor at nominal input voltage and rated load current (100 mA/div).
See Figure 13.
0.9Vout
1.8Vout
0.9Vout
1.8Vout
3.3Vout
5.0Vout
3.3Vout
5.0Vout
Figure 15: Input Terminal Ripple Voltage at nominal input voltage and
Figure 16: Output Voltage Ripple at nominal input voltage and rated
rated load current (200 mV/div). Load capacitance: 22
and 100
µ
F ceramic cap
load current (50 mV/div). Load capacitance: 22
µF ceramic cap and
µ
F tantalum cap. Bandwidth: 20 MHz. See Figure 13.
100 F tantalum cap.. Bandwidth: 20 MHz. See Figure 13.
µ
1
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0.1
0.01
0.001
0.0001
5 Vout
5 Vout
2.5 Vout
1.5 Vout
2.5 Vout
1.5 Vout
100
1,000
10,000
Hz
100,000
1,000,000
10
100
1,000
Hz
10,000
100,000
Figure 17: Magnitude of incremental output impedance (Z
=
Figure 18: Magnitude of incremental forward transmission (FT =
/v ) for nominal input voltage at full rated power with 100 F tan-
out
/i ) for nominal input voltage at full rated power with 100
v
µ
F tan-
v
µ
out out
out in
talum output capacitor.
talum output capacitor.
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 7
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
100
10
5
0
-5
-10
-15
-20
-25
-30
1
0.1
0.01
0.001
0.0001
5 Vout
-35
5 Vout
2.5 Vout
2.5 Vout
1.5 Vout
-40
1.5 Vout
-45
10
100
1,000
10,000
100,000
1,000,000
10
100
1,000
Hz
10,000
100,000
Hz
Figure 19: Magnitude of incremental reverse transmission (RT =
/i ) for nominal input voltage at full rated power with 100 F tanta-
lum output capacitor.
Figure 20: Magnitude of incremental input impedance (Z = v /i )
in in in
i
µ
for nominal input voltage at full rated power with 100µF tantalum out-
in out
put capacitor
.
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 8
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
For a desired increase of the nominal output voltage, the value of
the resistor should be:
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.
10500
_
=
(Ω)
Rtrim-up
1000
VDES - 0.7525
or
10500
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.
=
VOUT
(Ω)
0.7525 +
R
trim-up + 1000
where
V
DES = Desired Output Voltage
The NiQor series of SIPs and SMT converters uses the established
industry standard footprint and pin-out configurations.
To maintain the accuracy of the output voltage over load current,
it is vital that any trim-up resistor be terminated directly to the con-
verter's ground foot, not at the connection to the load. A sepa-
rate Kelvin connection to the PCB pad for the ground foot is opti-
mal. Trim-down resistors should be terminated at the converter's
Sense+ pin.
CONTROL FEATURES
REMOTE ON/OFF: The ON/OFF input permits the user to con-
trol 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.
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.
Pin-Open
Float
Voltage
Pin-Open
Converter
State
Option
P Logic Positive/Open
O Logic Negative/Open
Description
Pin Action
Pull Low = Off
Pull High = Off
5
0
On
On
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 appli-
cation 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 VOLTAGE TRIM: The TRIM input permits the user to
adjust the output voltage according to the trim range specifica-
tions 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 set-
point of 0.7525V using an external resistor, connect the resistor
Rtrim-up between the TRIM and the Ground pin according to the
diagram below.
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.
Vout
Vin
Sense+
On/Off
Trim
Gnd
Internal Over-Voltage Protection: To fully protect from
excessive output voltage, the NQ16 series contains an Output
Over-Voltage Shutdown circuitry.
Rtrim-up
This OVP is independent of the trimmed setpoint. As such, the
converter's load is protected from faults in the external trim cir-
cuitry (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 # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 9
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
The shutdown point is fixed on standard option. SMA also offers
adjustable OVP set point. For more detailed information contact
SynQor technical support.
put of the SMA16 series of converters. The VMA16 series has
this capacitance included internally. In many applications, how-
ever, additional external output capacitance is required to reduce
the response to load transients to an allowable level.
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.
The output impedance
of these converters can
be quite accurately
modeled from DC to
about 100kHz as
shown in Figure F.
A
further simplified ver-
sion of it, valid below
40Hz
1kHz, is shown in
Figure G. In the
SMA16 case, the mod-
els depict the minimum
and
above
APPLICATION CONSIDERATIONS
Input Filtering/Capacitance/Damping: The filter circuit of
Figure E is often added to the converter's input to prevent switch-
ing noise from reaching the input voltage bus.
Figure F: NQ16 Passive Output Model
recommended output capacitance, Ct with its resistance Rt. In
the VMA16 family, that capacitor is again included in the con-
verter.
If the dynamic char-
acteristics of the load
are known, any stan-
dard simulator can
use these models to
predict the in-circuit
transient response.
Figure E: NQ16 converter with Input Filter
In the SMA16 (surface mount) converters Cin = 30µF of high
quality ceramic capacitors. With Lin of 1µH, Cd should be 100-
200µF and Rd should be 0.1-0.2Ω, in most applications. For
more information on designing the input filter and choosing prop-
er values, contact SynQor technical support.
Figure G: Simplified NQ16 Output Model
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 capaci-
tors. Just a few nano-Henries of parasitic inductance can create
a resonance (or an overtone) near the converter's switching fre-
quency. Cin has a reactance of 10-20m
Ω at the 300kHz switch-
ing frequency. To avoid this high-frequency resonance, any exter-
nal input filter should exhibit a net source impedance of at least
Figure H: Converter with Additional Output Capacitance
For minimal overshoot upon recovery, Cd should be related to the
minimum in-circuit net ESR.
20m
Ω resistive through this frequency range. This requirement is
easily met with the damping elements discussed above. Adding
a small amount (a few µF) of high-frequency external ceramic will
not violate it.
parallel (L1, L2)
Cd >
2
ESRd
min
If using converters at higher powers, consider the ripple current
rating of Cd. Contact SynQor technical support for details.
For more detailed derivations of these values contact SynQor
technical support.
Output Capacitance: It is recommended to add at least
100µF of capacitance, with an ESR in the 0.1
Ω range, to the out-
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 10
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
Thermal Performance (SMA16): While impossible to be
exact, a simplified thermal model for the mounted converter is
detailed below.
SURFACE MOUNT INFORMATION
PCB Layout Considerations: SynQor recommends that the
customer use a non-solder mask defined pad design. The mini-
mum 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 elimi-
nate 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 place-
ment 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
o
3 C/W for converters running at higher output voltage, and
o
about 4 C/W for lower voltage converters.
• Rt_Pcb-Amb models the power dissipation from converter PCB
o
to the air stream. It ranges from about 15 C/W at 400LFM to
o
about 25 C/W 100LFM.
• Rt_Pcb-Feet expresses the thermal path from the converter's
o
PCB though its mounting feet; it is about 3 C/W.
• Rt_spread models the heat spreading on the PCB to which the
converter is mounted and is largely dependent upon the con-
struction 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 per-
formance should be verified with the unit mounted in its intend-
ed manner and powered in circuit with all neighboring circuit-
ry active. Attach a thermocouple to the converter's hotspot as
shown in Figures 4, 6, and 8 in the Performance Curves sec-
tion.
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 11
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
Reflow Soldering Guidelines: Figure J
shows a typical reflow profile for a eutectic sol-
der process. Due to variations in customer
applications, materials and processes, it is not
feasible for SynQor to recommend a specific
reflow profile. The customer should use this pro-
file as a guideline only. Since the NiQor sur-
face mount modules have a larger thermal mass
and lower thermal resistance than standard
SMT components, it may be necessary to opti-
mize the solder reflow profile based on limita-
tions of the other components on the customer
board. Sufficient reflow time must be allowed to
fuse the plating on the connection to ensure a
reliable solder joint. The solder reflow profile
should be confirmed by accurately measuring
the SMT interconnect leads. Maximum case
temperature of 260°C (exposure for 5 seconds
or less) is not exceeded for the NiQor units.
Maximum Temperature (+210-260oC)
Eutectic Solder Melting Point (+183oC)
(+150-155oC)
Pre-heat
Reflow
Cool Down
Soak
0.5-0.6oC/sec
•
•
1.3-1.6oC/sec
•
•
60 to 90 sec.,
typ., 2 min max
30 to 60 sec., typ.,
90 sec max
•
< 2.5oC/sec
2 to 4 min.
Figure J: Typical Eutectic (96.5Sn/3.0Ag/0.5Cu) Solder Profile
RoHS Compliance:
The EU led RoHS (Restriction of
Moisture Sensitivity: The NiQor surface mount modules have
an MSL rating 1 per IPC/JEDEC J-STD-033A.
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.
Cleaning and Drying: When possible, a no-clean solder
paste system should be used to solder the NiQor SMT units to
their application board. The modules are suitable for aqueous
washing, however, the user must ensure sufficient drying to
remove all water from the converter before powering up.
Inadequate cleaning and drying can affect the reliability of the
converter and the testing of the final assembly.
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 12
Input:
Outputs:
Current:
Package:
6.0 - 16.0V
0.75 - 5.0V
16A
SMT
Technical Specification
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s NiQor DC/DC con-
verters 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.
NQ 16 W50 S M A 16 P S S - G
6/6 RoHS
Options (see
Ordering Information)
Output Max Output
Output Current
Model Number
Input Voltage
Voltage
NQ16W50SMA16xyz -G 6.0 - 16.0 V 0.75-5.0 V
Current
16 A
Thermal Design
Performance Level
Package Size
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Output Voltage
Input Voltage
Options Description: x y z
Product Family
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
O - Neg./Open
S - Sense
N - None
S - Standard
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:
Warranty
Phone:
978-849-0600
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Toll Free: 888-567-9596
Fax:
978-849-0602
E-mail:
Web:
power@synqor.com
www.synqor.com
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.
Address: 155 Swanson Road
Boxborough, MA 01719
USA
Product # NQ16W50SMA16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2NS12WE Rev. A
11/26/07
Page 13
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