20A - SynQor

Technical
Specification
NQ20x20ETx20
9-20 V
0 - 20V
20A
Non-
Eighth-brick
Continuous Input
Outputs
Current
Isolated
DC-DC Converter
The NiQor Eighth-brick dc-dc converter is a non‑isolated buckboost regulator, which employs synchronous rectification to
achieve extremely high conversion efficiency. The High
Non-Isolated
Input Voltage NiQor Brick family of converters can be used
in traditional DPA (distributed power architecture) systems
or provide a regulated output voltage from a battery source
or other variable voltage source. The NiQor Eighth-brick
ET
W20
0
NQ2 V
family can be configured to Buck the input voltage down to
9-2
0
IN
C20
2 0 V OU
0-
T
-NN
S-G
0A
@2
a lower voltage or Boost the input voltage up to a higher
voltage using a single external resistor. These modules are
RoHS 6/6 compliant (see page 12).
NiQor Eighth-brick module
Operational Features
•
•
•
•
•
•
•
•
High efficiency, 95% at full rated load current
Delivers up to 20A of output current
Input Voltage Range: 9-20 Vdc
Output Voltage Range: 0 - 20V (negative output is possible)
Extensive on-board input and output filtering
No minimum load requirement means no preload resistors required
Buck or buck-boost versions available
Adjustable current limit with current monitor (C option)
Protection Features
• Input under-voltage lockout protects the converter at low input
voltage conditions
• Over-current shutdown protects converter from excessive
load current or short circuits
• Input/output over-voltage protection protects load and regulator
from damaging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
Mechanical Features
Safety Features
• Industry standard eighth-brick pin-out configuration
• Sizes: .99" x 2.39" (25.04x60.6 mm)
Flanged - 1.45” x 2.39” (36.8 x 60.6mm)
• Total height only 0.500" (12.7 mm)
● UL 60950-1:2007
● EN60950-1/A12:2011
● CAN/CSA-C22.2 No. 60950-1:2007
• Total weight: 1.7oz (48g)
Flanged: 1.9oz (53g)
Contents
Control Features
•
•
•
•
•
Page No.
On/Off control
Output voltage trim permits custom voltages
Remote Sense (S option, standard)
Current limit trim (C option)
Output voltage trim range from 0 - 20V
Product # NQ20x20ETx20
Phone 1-888-567-9596
Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Baseplated Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Technical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standards & Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Technical Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 1
Input:
Outputs:
Current:
Package
Standard Mechanical Diagram
9-20 V
0 - 20V
20A
Eighth-brick
0.99 (25)
0.600 (15.24)
0.450 (11.43)
0.300 (7.62)
0.500 ±0.025
(12.7 ±0.63)
0.150 (3.81)
Overall height
8 7 6 5 4
2.39
(60.6)
2.00
(50.8)
Top View
0.18
(4.6)
0.19 (4.9)
Side View
0.145
1
2
(3.68)
3
Bottom side Clearance
0.300 (7.62)
0.600 (15.24)
0.020 ±0.010
(0.51 ±0.25)
NOTES
PIN DESIGNATIONS
1) BASEPLATE FLATNESS TOLERANCE IS 0.004" (.10mm)
TIR FOR SURFACE
2) PINS 1-3, 5-7 ARE 0.040" (1.02mm) DIA. WITH
0.080" (2.03mm) DIA. STANDOFF SHOULDERS
3) PINS 4 AND 8 ARE 0.062" (1.57mm) DIA. WITH
0.100" (2.54mm) DIA. STANDOFF SHOULDERS
4) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
5) UNDIMENSIONED COMPONENTS ARE SHOWN
FOR VISUAL REFERENCE ONLY
6) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
7) WEIGHT: 1.7oz (48g) TYPICAL
8) WORKMANSHIP: MEETS OR EXCEEDS IPC-A-610 CLASS II
Product # NQ20x20ETx20
Phone 1-888-567-9596
Pin
Label
Function
1
Vin(+)
2
ON/OFF
3
4
Vin(-)
Vout(-)
5
SENSE
(-)
Positive input
TTL input to turn converter on and off,
referenced to Vin(-), with internal pull up
Negative input voltage, internal short to Pin 4
Negative output voltage, internal short to Pin 3
Negative remote sense. See note 1 (S option)
Itrim (C option)
Output voltage trim
Positive remote sense. See note 2 (S option)
Imon (C option)
Positive output voltage
6
TRIM
7
SENSE
(+)
8 Vout(+)
Notes:
1)SENSE(–) should be connected to Vout(–) either remotely or
at the converter
2)SENSE(+) should be connected to Vout(+) either remotely or
at the converter
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 2
Input:
Outputs:
Current:
Package
Flanged Mechanical Diagram
1.45
[36,8 ]
1.27
[32,3 ]
.99
USE W/ 4-40 OR M3 SCREW (6x)
RECOM. TORQUE
3 in.lb
.13[3,3]
OVERALL HEIGHT
.500 .025
[12,7
0,63]
[25 ]
9-20 V
0 - 20V
20A
Eighth-brick
.15 [3,7 ]
SEE NOTE 5 & 6
.01 [0,2]
4
5
6
7
.60
[15,2 ]
.45
[11,4 ]
.30
[7,6 ]
.15
[3,8 ]
8
TOP VIEW
2.07
[52,5 ]
1.66
[42,2 ]
2.39
[60,6 ]
2.00
[50,8 ]
1.01
[25,7 ]
.36
[9,1 ]
3
1
.18
[4,6 ]
.193
.02
[0,6 ]
.34
[8,5 ]
.43
[10,8 ]
[4,9 ]
.13
[3,2 ]
NOTES
1) APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5in-lb (0.7Nm)
(3in-lb RECOMMENDED)
2) BASEPLATE FLATNESS TOLERANCE IS 0.010" (.10mm)
TIR FOR SURFACE
3) PINS 1-3, 5-7 ARE 0.040" (1.02mm) DIA. WITH
0.080" (2.03mm) DIA. STANDOFF SHOULDERS
4) PINS 4 AND 8 ARE 0.062" (1.57mm) DIA. WITH
0.100" (2.54mm) DIA. STANDOFF SHOULDERS
5) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) UNDIMENSIONED COMPONENTS ARE SHOWN
FOR VISUAL REFERENCE ONLY
7) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
8) WEIGHT: 1.9oz (53g) TYPICAL
9) WORKMANSHIP: MEETS OR EXCEEDS IPC-A-610 CLASS II
Product # NQ20x20ETx20
Phone 1-888-567-9596
2
1
.30
BOTTOMSIDE
CLEARANCE
.01 [0,3 ]
[7,6 ]
.60
[15,2 ]
.79
[20,1 ]
PIN DESIGNATIONS
Pin
Label
Function
Vin(+) Positive input
TTL input to turn converter on and off,
2 ON/OFF
referenced to Vin(-), with internal pull up
3
Vin(-) Negative input voltage, internal short to Pin 4
4
Vout(-) Negative output voltage, internal short to Pin 3
SENSE Negative remote sense. See note 1 (S option)
5
(-)
Itrim (C option)
6
TRIM Output voltage trim
SENSE Positive remote sense. See note 2 (S option)
7
(+)
Imon (C option)
8 Vout(+) Positive output voltage
Notes:
1)SENSE(–) should be connected to Vout(–) either remotely or
at the converter.
2)SENSE(+) should be connected to Vout(+) either remotely or
at the converter.
www.synqor.com
1
Doc.# 005-0005380 Rev. K
02/11/14
Page 3
Input:
Outputs:
Current:
Package
Technical Specification
9-20 V
0 - 20V
20A
Eighth-brick
NQ20x20ETx20 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 12 V dc 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
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Storage Temperature
Voltage at ON/OFF input pin
Vout
Min.
All
All
All
All
0
Typ.
-45
-0.5
Max.
Units Notes & Conditions
30
20
125
5.5
V
V
°C
V
Continuous
Continuous
20
25
20
V
A
A
µF
V
A
Turn on at 10V
Fast blow external fuse recommended
Input current max equals output rated current
ESR < 1.5 Ω
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
Input Fuse Rating
All
All
9
All
All
All
100
0
0
All
All
All
All
5
12
20
All
All
9.2
8.1
All
All
0
0
All
3.3
5
20
All
All
±160 mV ±4%*Vout
10
20
40
24
0
5000
Input Current
External Input Capacitance
Output Voltage
Output Current
INPUT CHARACTERISTICS
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis
Input Current Limit
No-Load Input Current
“
“
Disabled Input Current
Input Filter Components Value (C\L\C)
OUTPUT CHARACTERISTICS
Output Voltage Range
Operating Output Current Range
Output Voltage Regulation
Total Output Voltage Range
Output Voltage Ripple and Noise (pk-pk/36Vin)
“
“
Output DC Over Current limit
External Output Capacitance
C Option: Isense voltage
No load
Full load
Output resistance of Isense
C Option: Itrim voltage
Voltage at no load
Voltage at maximum load
Pull-Up Resistance of Itrim Pin
Pull-Up Voltage
C Option: Reverse Current
EFFICIENCY
100% Load; 20 Vin
100% Load; 20 Vin
100% Load; 12 Vin
50% Load; 20 Vin
50% Load; 20 Vin
50% Load; 12 Vin
Product # NQ20x20ETx20
20
20
9.5
8.5
1.0
24
115
140
150
60
20\1.1\60
10
8.9
V
V
V
A
mA
mA
mA
mA
µF\µH\µF
20
20
V
A
1.25
1.83
10
V
V
kΩ
All
All
All
All
All
0.12
2.12
10.2
2.5
V
V
kΩ
V
µA
5
12
20
5
12
20
88
94
95
90
95
95
Phone 1-888-567-9596
www.synqor.com
Set output by Rtrim resistor
Sense pin, over sample, line, load, temp. & life
mV
mV
mV
A
µF
All
All
All
2
Output voltage dependent
%
%
%
%
%
%
10 Vin Full Load; 100uF; 20 MHz b.w.
"
Effective on input, output condition
ESR > 1 mΩ
10 A load
10 A load
Enabled or Disabled
W mode only
W mode only
Doc.# 005-0005380 Rev. K
02/11/14
Page 4
Input:
Outputs:
Current:
Package
Technical Specification
9-20 V
0 - 20V
20A
Eighth-brick
NQ20x20ETx20 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 12 V dc 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
Vout
Min.
Typ.
Max.
Units Notes & Conditions
DYNAMIC CHARACTERISTICS
Output Voltage during Current Transient
For a Step Change in Output Current
Settling Time
Turn on Transient
Startup delay
Rise Rate
Output Voltage Overshoot
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control
Negative Logic (N) ON/OFF Control
Off-State Voltage
On-State Voltage
Pull-Up Voltage
Pull-Up Resistance
Output Voltage Trim Range
Input/Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
TEMP LIMITS FOR POWER DERATING
Semiconductor Junction Temperature
Board Temperature
Baseplate Temperature
RELIABILITY CHARACTERISTICS
Calculated MTBF (TR-NWT-000332; Telcordia)
Calculated MTBF (MIL-HDBK-217F; MIL-217)
Field Demonstrated MTBF
Product # NQ20x20ETx20
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All
1
V
All
5
ms
All
All
All
2
0.2
0
ms
V/ms
V
260
kHz
3.3
0.8
V
V
V
kΩ
V
V
°C
°C
All
240
All
All
All
All
All
All
All
All
1.8
0
250
3.3
10
0
22
24
115
15
All
All
All
All
All
All
20
25
125
125
100
2.5
1.9
www.synqor.com
°C
°C
°C
(0.1 A/µs); 50%-75%-50% Iout max
To within 1.5% Vout nom.
Resistive load
"
"
Measured Vout+ to common pins
Over full temp range
Average PCB Temperature
Package rated to 150 °C
ULrated max operating temp 130 °C
106 Hrs. 100% load, 200LFM, 40 °C Ta
106 Hrs. 100% load, 200LFM, 40 °C Ta
106 Hrs. See our website for details
Doc.# 005-0005380 Rev. K
02/11/14
Page 5
Input:
Outputs:
Current:
Package
Standards & Qualifications
Parameter
9-20 V
0 - 20V
20A
Eighth-brick
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:2007
CAN/CSA-C22.2 No. 60950-1:2007
EN60950-1/A12:2011
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
Test on entire assembly; board & plastic components UL94V-0 compliant
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.
Parameter
# Units
Test Conditions
QUALIFICATION TESTING
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
Vibration
5
10-55 Hz sweep, 0.060” total excursion, 1 min./sweep, 120 sweeps for 3 axis
Mechanical Shock
5
100g minimum, 2 drops in x, y, and z axis
Temperature Cycling
10
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Power/Thermal Cycling
5
Toperating = min to max, Vin = min to max, full load, 100 cycles
Design Marginality
5
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
Humidity
5
85 °C, 95% RH, 1000 hours, continuous Vin applied except 5 min/day
Solderability
15 pins
MIL-STD-883, method 2003
Altitude
2
70,000 feet (21 km), see Note
Note: A conductive cooling design is generally needed for high altitude applications because of naturally poor convective cooling at rare atmospheres.
Product # NQ20x20ETx20
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Doc.# 005-0005380 Rev. K
02/11/14
Page 6
Input:
Outputs:
Current:
Package
Technical Charts
100
20
12Vin 20Vout
12Vin 5Vout
12Vin 3.3Vout
20Vin 12Vout
20Vin 5Vout
20Vin 3.3Vout
95
Power Dissipation (W)
90
Efficiency (%)
9-20 V
0 - 20V
20A
Eighth-brick
85
80
75
12Vin 20Vout
12Vin 5Vout
12Vin 3.3Vout
20Vin 12Vout
20Vin 5Vout
20Vin 3.3Vout
70
65
60
15
10
5
0
0
4
8
12
16
20
0
4
8
12
16
20
Load Current (A)
Load Current (A)
Figure 1: Efficiency at different output voltage vs. load current for different input
voltage at 25 °C.
Figure 2: Power dissipation at different output voltage vs. load current for
different input voltage at 25 °C.
21
1 µH
Derated Output Current (A)
18
source
impedance
15
12
i
S
9
See Fig. 5
See Fig. 6
i
C
Converter
Tb=100 C; Vout=5 V
V
Tb=80 C; Vout=12 V
SOURCE
Tb=100 C; Vout=12 V
3
Dc-dc
IN
Tb=80 C; Vout=5 V
6
V
Tb=100 C; Vout=20 V
8
10
12
14
16
Input Voltage (V)
18
* See values for recommended external input capacitance.
Inductor optional as needed.
20
OUT
100 µF
100mΩ ESR
C*
Tb=80 C; Vout=20 V
0
V
tantalum
capacitor
Figure 3: Maximum output power derating curve with a controlled baseplate
temperature of 80ºC and 100ºC.
Figure 4: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Fig 5), and Output Voltage Ripple (Fig 6).
Figure 5: Input Terminal Ripple Current at 10 V input voltage and rated load
current (500 mA/div). Bandwidth: 20 MHz. (See Figure 4)
Figure 6: Output Voltage Ripple at 10 V input voltage and rated load current
(20mV/div). Zero load capacitance. Bandwidth: 20 MHz. (See Figure 4)
Product # NQ20x20ETx20
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Doc.# 005-0005380 Rev. K
02/11/14
Page 7
Input:
Outputs:
Current:
Package
Technical Charts
Figure 7: Turn-on transient at zero load (50 ms/div).
ON/OFF input (5 V/div)
Ch 1-4: Vout (5 V/div)
9-20 V
0 - 20V
20A
Eighth-brick
Figure 8: Turn-on transient at full load (50 ms/div).
ON/OFF input (5 V/div)
Ch 1-4: Vout (5 V/div)
1.9
2.5
1.8
2.0
1.6
Itrim (V)
IMON (V)
1.7
1.5
1.5
1.0
1.4
0.5
1.3
1.2
0.0
0
5
10
Load (A)
15
20
Figure 9: Imon pin voltage vs. load current at 16 V input and 13.8 V output.
Load capacitance: 100µF electrolytic cap. C option only.
0
5
10
15
Current Limit (A)
20
25
Figure 10: Current limit vs. Itrim pin voltage with 16 V input and 13.8 V output.
Load capacitance: 100µF electrolytic cap. C option only.
Figure 11: Output voltage response for 3.3 V, 5 V, 12 V, 20 V units to step‑change
in load current (50-75-50% of Iout max; di/dt=0.1A/µs). Load cap: 100µF,
100mΩ ESR tant, Ch 1-4: Vout (1 V/div);(5ms/div).
Product # NQ20x20ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 8
Input:
Outputs:
Current:
Package
Application Section
9-20 V
0 - 20V
20A
Eighth-brick
BASIC OPERATION AND FEATURES
PROTECTION FEATURES
These converters use a digital controller for the buck stage
and the boost stage. It automatically changes operating mode
(buck or boost) when the line voltage or output set point
changes. Both stages are accomplished with synchronous
rectifiers. Very high efficiency is maintained over wide input
and output voltage ranges by the change in operational mode
and the use of synchronous rectifiers.
Input Under-Voltage Lockout:
The converter is
designed to turn off when the input voltage is too low,
which helps to 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.
The converter runs at a fixed frequency with a predictable
EMI performance.
Note: Since this converter supports a wide range of input and
output voltage, the current rating and current limit function
affect both input and output current, whichever is higher at
the time. When in buck mode, the output current is higher. In
boost mode the input current is higher.
CONTROL FEATURES
REMOTE ON/OFF: The On/Off input permits the user to
control when the converter is on or off. Only Negative ON/
OFF logic is available in this power module series.
The negative logic ON/OFF signal turns the module OFF when
it is high (leave the pin floating or set its voltage between
1.8~3.3 V) and turns the module ON when it is low (below
0.8V with respect to Vin-).
OUTPUT VOLTAGE TRIM: The output voltage can be
programmed to any voltage between 0Vdc and Vrated by
connecting one resistor between the Pin 6 (TRIM) pin and
Pin 5 [Sense(-)](S-version) or Pin 4 [Vout(-)](C-version). For a
desired output voltage, the value of the resistor is:
RVtrim(Vout) =
[(
) ]
( )
12465 x Vrated
Vtrim + 0.0569 x Vrated
_ 10912
(Ω)
Output Current Shutdown: To provide protection in an
output short condition, the unit is equipped with internal
short circuit protection. When the short circuit protection is
triggered, the unit first shuts down. After an approximately
16 ms inhibit time, the unit turns on again. If the short
circuit condition remains, the current limit circuit will control
the output current. The unit will operate normally once the
fault condition is removed.
Internal Over-Voltage Protection (OVP): To protect
the load against an excessive output voltage, an output
over-voltage shutdown feature is included. This OVP is fixed
and independent of the output voltage set point.
Over-Temperature Shutdown: A temperature sensor
on the converter senses the average temperature of the
module. The over temperature 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.
Alternatively, the TRIM pin can be driven from an external
voltage source:
Vpin6 = 2.366 – 2.180
Vtrim
Vrated
Where, for both approaches:
Vtrim = desired output voltage setpoint
Vrated = rated output voltage
Vpin6 = trim pin voltage (when driven externally)
RVtrim = resistor value to set Vout
Note: To maintain the accuracy of the output voltage over
load current, it is vital that any trim resistor be connected to
the converter’s Sense(-) pin (for the S-option) or Vout(-) pin
(for the C-option), locally at the converter, not at a remote
location nearer to the load. A separate Kelvin connection to
the PCB pad for the Vout(-) is optimal for the C-option.
Product # NQ20x20ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 9
Input:
Outputs:
Current:
Package
Application Section
9-20 V
0 - 20V
20A
Eighth-brick
APPLICATION CONSIDERATIONS
Limited output voltage resolution: The internal voltage
control feedback loop is digital and has limited resolution.
Therefore, the output voltage will exhibit discrete steps as
the loop responds to changes in line, load, trim, or remote
sense. For instance, on close examination, the startup ramp
has a “stair-step” shape. Likewise, a load transient response
will be composed of multiple discrete steps.
Input filtering: These modules should be connected to a
low-impedance source. A highly inductive source can affect
the stability of the module. An input capacitor with an ESR
must be placed directly adjacent to the input pin of the
module to minimize input ripple voltage and ensure module
stability.
Negative output: This series of converters can be
connected to achieve a negative output from a positive
input as shown in Fig A.
Vin+
1
Cin1
Vin-/
Vout+
Cin2
Vout+
SENSE+
2 ENABLE
TRIM
DC-DC SENSE3 Vin- Converter VoutVin+
8
7
6
5
4
Cout1
RVtrim
Vout-
Figure A: Negative output setup
See application note: Input System Instability
(http://www.synqor.com/documents/appnotes/appnt_System_Instability.pdf)
Output capacitance: No extra external capacitor is
required. However, to reduce the output ripple and
improve dynamic response to a step load change additional
capacitance at the output can be used. Low ESR polymer
and ceramic capacitors are recommended to improve the
dynamic response of the module. The addition of external
output capacitance may cause the start-up time to change.
Using this negative output configuration impacts the available
output voltage range and current limit.
The output voltage range becomes 0 to (Vmax - Vin), and
the current limit (for either the buck or boost modes) is
scaled by:
Irated(neg) =
Vin
(Vin + Vout)
* Irated
Remote sense (S-option only): Vout remote sensing
is provided to achieve proper regulation at the load points
and reduce effects of distribution losses on output line. The
module can correct for a total of 10% drop in the output
lines. In the event of an open remote sense line, the
module will maintain regulation through an internal resistor
connection.
Current limit: The available power is limited by an output
current limit in buck mode (when Vin>Vout) and by an input
current limit in boost mode (when Vin<Vout).
for Vin >Vout:
Ilimit = 1.2 x Imax
for Vin < Vout:
Ilimit = 1.2 x Imax x
( Vout )
Vin
where Imax = maximum rated output current
Product # NQ20x20ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 10
Input:
Outputs:
Current:
Package
Application Section
C-FEATURE
SET
(Current
monitor/
trimmable current limit (C-option)
In addition to voltage trim, the C-option offers an adjustable
current limit trim and a current monitor Imon pin. It does
not have remote sense.
Output current limit trim: The output current limit can
be set to any value between zero and Irated by choosing the
value of RItrim as follows:
RItrim =
Zero back-drive current: The C-option includes an ideal
diode circuit in series with the Vout+ pin that prevents
reverse current flow. This enables applications such as
battery charging, current sharing, and current monitoring.
DC-DC
Converter
1
Cin
Vin-
Vin+
2 ENABLE
3 Vin-
1.153 Irated - Itrim
) ]
10200 - 10
(Ω)
Where I
trim = desired current limit setpoint
Irated = rated maximum converter current
V(pin5) = 2.085(Itrim/Irated) + 0.0953
Vout+
Vout+ 8
IMON 7
TRIM 6
ITRIM 5
Vout- 4
[(
0.0469 Irated + Itrim
Alternatively, the Itrim pin can be driven from an external
voltage source:
C-Option Connection
Vin+
9-20 V
0 - 20V
20A
Eighth-brick
IMON
Output
Cout
RItrim RVtrim
Vout-
Figure B: Current monitor/trimmable current limit setup
Output voltage trim: The RVtrim resistor increases the
output voltage, identical in function to the S-option (p.9).
Output current limit: There are three levels of current
that must be understood when considering the term
“Output Current Limit” as listed below:
IOCL = over-current limit (from datasheet Output Characteristics: Output DC Over Current Limit). This is a built in
fixed value of current at which the converter will limit.
where Itrim is the desired current limit setpoint
Note: It is possible to choose RItrim such as that Itrim
is greater than Irated, but SynQor does not recommend
continuous operation above Irated.
Note: When in boost-mode, the output current could still
be limited by the maximum current limit, IOCL, applied to
the input current.
Current monitor: The Imon pin voltage tracks the output
current, as shown in figure 9. Zero load current is 1.25V and
maximum rated load current is 1.83V. This pin has a 49.9
Ohm output impedance.
1.25V
49.9Ω
Imon
Figure D: Current monitor circuit
Irated = rated current of the converter (input or output)
Itrim = desired output current limit
Figure C shows the relationship among these three currents.
I
OCL
Irated
Itrim
Figure C: Relationship of output current terms.
Product # NQ20x20ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 11
Input:
Outputs:
Current:
Package
Ordering Information
9-20 V
0 - 20V
20A
Eighth-brick
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s 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.
Add “-G” to the model number for 6/6 RoHS compliance.
NQ 2 0 W 2 0 E T C 2 0
N N S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
Output Current
NQ20w20ETx20Nyz-G
Input
Voltage
9-20 V
Output
Voltage
0 - 20V
Max Output
Current
20A
Thermal Design
The following options must be included in place of the w x y z
spaces in the model numbers listed above.
Performance Level
Package Size
Output Voltage
Mode: w
Mode (see Ordering Information)
Input Voltage
Product Family
The first 12 characters comprise the base part number and
the last 3 characters indicate available options. The “-G”
suffix indicates 6/6 RoHS compliance.
T - Buck
W - Buck /
Boost
Options Description: x y z
Enable
Thermal Design
Pin Style
Feature Set
Logic
C - Encased
V - Encased
with Flanged
Baseplate
NNegative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
C - Current
monitor
output /
Trimmable
current limit
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium,
Hexavalent Chromium, Mercury, Polybrominated Biphenyls
(PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical
and Electronic Equipment. This SynQor product is 6/6 RoHS
compliant. For more information please refer to SynQor’s
RoHS addendum available at our RoHS Compliance / Lead Free
Initiative web page or e-mail us at [email protected]
Not all combinations make valid part numbers, please contact
SynQor for availability. See the Product Summary web page for
more options.
PATENTS
SynQor holds the following U.S. patents, one or more of which
apply to 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
8,149,597
8,493,751
Contact SynQor for further information and to order:
Phone: 978-849-0600
Toll Free:1-888-567-9596
Fax:
978-849-0602
E-mail: [email protected]
Web:
www.synqor.com
Address: 155 Swanson Road
Boxborough, MA 01719
USA
Product # NQ20x20ETx20
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.
www.synqor.com
Doc.# 005-0005380 Rev. K
02/11/14
Page 12