10A/50W

Technical
Specification
RQ18xxxQMXxxx
Rail Grade DC-DC Power Supply
9-36V
40 V
5.0-24V
50W
2250Vdc
Quarter-brick
Continuous Input
Transient Input
Outputs
Max Power
Isolation
DC-DC Converter
RQ
18
DC
05
9-3 -DC
0
CO
6V
NV Q M
IN 5
.0V ERT C 1
0N
ER
OU
T @
RS
10
-G
A
Protection Features
►Input under-voltage lockout
►Output current limit and short circuit protection
►Active back bias limit
►Output over-voltage protection
►Thermal shutdown
Control Features
Safety Features
►On/Off control referenced to input side
►Remote sense for the output voltage
►Output voltage trim range of -20%, +10%
Operational Features
►High efficiency, 90% at full rated load current
►Delivers full power with minimal derating - no heatsink required
►Operating input voltage range: 9-36V
►Fixed frequency switching provides predictable EMI
► No minimum load requirement
►Meets requirements of standard EN 50155
Mechanical Features
►Industry standard quarter-brick pin-out configuration
►Size: 1.536" x 2.386" (39.01 x 60.6)
►Height: 0.500” (12.7mm)
►Weight: 2.9oz (84g)
Product # RQ18xxxQMXxx
The RailQor® quarter-brick converter series is composed of
next-generation, board-mountable, isolated, fixed switching
frequency dc-dc converters that use synchronous rectification to
achieve extremely high power conversion efficiency, even at low
output power levels. Power dissipation is so low that no heatsink
is necessary to operate at 85°C in an enclosed environment
without airflow. Each module is supplied completely encased
to provide protection from the harsh environments seen in many
industrial and transportation applications.
Phone 1-888-567-9596
► Basic insulation
► Input-to-output isolation 2250V
► UL 60950-1:2007/A2:2014
► CAN/CSA C22.2 No. 60950-1:2007/A2:2014
► EN 60950-1:2006/A2:2013
► RoHS compliant (see last page)
Contents
Family Electrical Characteristics........................................................................2
Electrical Characteristics (5.0Vout) & Figures...................................................4
Electrical Characteristics (12Vout) & Figures....................................................6
Electrical Characteristics (15Vout) & Figures....................................................8
Electrical Characteristics (24Vout) & Figures..................................................10
Application Section...........................................................................................12
Standard Mechanical Diagram..........................................................................17
Flanged Mechanical Diagram...........................................................................18
Standards & Qualification Testing....................................................................19
Ordering Information........................................................................................20
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 1
Technical
Specification
RQ18xxxQMXxxx
RQ18 Family Electrical Characteristics (all output voltages)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 18V dc unless otherwise noted; full operating temperature range is -40 °C to +110 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
-0.5
40
Operating
36
Operating Transient Protection
40
Isolation Voltage
Input to Output
2250
Input to Base-Plate
2250
Output to Base-Plate
2250
Operating Temperature
-40
110
Storage Temperature
-45
125
Voltage at ON/OFF input pin
-2
18
INPUT CHARACTERISTICS
Operating Input Voltage Range
9
18
36
Input Under-Voltage Lockout
Turn-On Voltage Threshold
8.8
9.0
9.2
Turn-Off Voltage Threshold
7.8
8.0
8.2
Lockout Voltage Hysteresis
1.0
Input Over-Voltage Shutdown
Recommended External Input Capacitance
100
Input Filter Component Values (L\C)
0.47\18
DYNAMIC CHARACTERISTICS
Turn-On Transient
Turn-On Time
9
Start-Up Inhibit Time
180
200
220
Output Voltage Overshoot
0
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
100
Isolation Capacitance (input to output)
1000
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
Board Temperature
125
Transformer Temperature
125
Maximum Baseplate Temperature, Tb
110
FEATURE CHARACTERISTICS
Switching Frequency
230
250
270
ON/OFF Control
Off-State Voltage
2.4
18
On-State Voltage
-2
0.8
ON/OFF Control
Pull-Up Voltage
5
Pull-Up Resistance
50
Over-Temperature Shutdown OTP Trip Point
125
Over-Temperature Shutdown Restart Hysteresis
10
RELIABILITY CHARACTERISTICS
Calculated MTBF (MIL-217) MIL-HDBK-217F
1.31
Field Demonstrated MTBF
Note 1: Higher values of isolation capacitance can be added external to the module.
Product # RQ18xxxQMXxx
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Units Notes & Conditions
V
V
V
Continuous
Continuous
1s
V dc
V dc
V dc
°C
°C
V
Baseplate temperature
V
V
V
V
V
µF
µH\µF
Not Available
Typical ESR 0.1-0.2 Ω
Internal values; see Figure D
ms
ms
%
Full load, Vout=90% nom.
See Figure E
Maximum Output Capacitance
See Absolute Maximum Ratings
MΩ
pF
See Note 1
°C
°C
°C
°C
Package rated to 150 °C
UL rated max operating temp 130 °C
kHz
Isolation stage switching frequency is the same
V
Application notes Figures A & B
V
kΩ
°C
°C
Average PCB Temperature
106 Hrs. Tb = 70°C
106 Hrs. See our website for details
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 2
Technical
Specification
RQ18xxxQMXxxx
120
Typical Current Limit Inception Point
Output Voltage (%)
100
80
Typical Output Voltage at Shutdown
60
40
Vin min
Vin nom
20
Vin max
0
0
Common Figure 1: Typical startup waveform. Input voltage pre-applied, ON/
OFF Pin on Ch 2.
10
20
30
40
50
60
70
80
90
Load Current (%)
100 110 120 130 140 150
Common Figure 2: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
100,000
10,000
5V
All voltages
15 V
Trim Resistance (kOhms)
Trim Resistance (kOhms)
12 V
10,000
24 V
1,000
100
10
0
1
2
3
4
5
6
7
8
9
10
1,000
100
10
0
Increase in Vout (%)
Common Figure 3: Trim graph for trim-up 5 to 48V outputs.
Product # RQ18xxxQMXxx
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1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Decrease in Vout (%)
Common Figure 4: Trim graph for trim down.
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Doc.# 005-0006162 Rev. F 04/27/2016
Page 3
Input:9-36V
Output:5V
Current:10A
Part No.:RQ18050QMx10
RQ18050QMx10 Electrical Characteristics(5.0 Vout)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 18V dc unless otherwise noted; full operating temperature range is -40 °C to +110 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
INPUT CHARACTERISTICS
Maximum Input Current
8.2
A
Vin min; trim up; in current limit
No-Load Input Current
100
200
mA
Disabled Input Current
4
6
mA
Response to Input Transient
0.23
V
See Figure 6
Input Terminal Ripple Current
200
mA
RMS
Recommended Input Fuse
30
A
Fast acting external fuse recommended
OUTPUT CHARACTERISTICS
Output Voltage Set Point
4.950
5.000
5.050
V
Output Voltage Regulation
Over Line
±0.1
±0.3
%
Over Load
±0.1
±0.3
%
Over Temperature
-75
75
mV
Total Output Voltage Range
4.875
5.125
V
Over sample, line, load, temperature & life
Output Voltage Ripple and Noise
20 MHz bandwidth; see Note 1
Peak-to-Peak
0
60
120
mV
Full load
RMS
10
20
mV
Full load
A
Operating Output Current Range
0
10
Subject to thermal derating
Output DC Current-Limit Inception
11.0
12.0
13.0
A
Output voltage 10% Low
Output DC Current-Limit Shutdown Voltage
2.8
V
Back-Drive Current Limit while Enabled
0.5
A
Negative current drawn from output
Back-Drive Current Limit while Disabled
10
mA
Negative current drawn from output
Maximum Output Capacitance
5,000
µF
Vout nominal at full load (resistive load)
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
210
mV
50% to 75% to 50% Iout max
Settling Time
400
µs
To within 1% Vout nom
Output Voltage Trim Range
-20
10
%
Across Pins 8&4; Common Figures 3-5; see Note 2
Output Voltage Remote Sense Range
10
%
Across Pins 8&4
Output Over-Voltage Protection
5.9
6.1
6.4
V
Over full temp range
EFFICIENCY
100% Load
89
%
See Figure 1 for efficiency curve
50% Load
91
%
See Figure 1 for efficiency curve
Note 1: Output is terminated with 1 µF ceramic and 15 µF low-ESR tantalum capacitors. For applications requiring reduced output voltage ripple and
noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Trim-up range is limited below 10% at low line and full load.
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 4
Input:9-36V
Output:5V
Current:10A
Part No.:RQ18050QMx10
100
7
95
6
Power Dissipation (W)
90
Efficiency (%)
85
80
75
70
9Vin
60
2.0
4.0
6.0
8.0
3
2
1
36Vin
0.0
4
9Vin
18Vin
65
5
18Vin
36Vin
0
10.0
Load Current (A)
0.0
2.0
4.0
6.0
8.0
10.0
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltages at 25°C.
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltages at 25°C.
12
10
10
8
Iout (A)
Iout (A)
8
6
4
4
9Vin
2
2
18Vin
0
36Vin
0
6
50
40
55
70
85
100
60
70
80
90
100
110
120
Baseplate Temperature (°C)
Ambient Air Temperature (°C)
Figure 3: Encased Converter (no heatsink) max. output current derating vs.
ambient air temperature for different Input Voltages and 0 LFM airflow (natural
convection airflow).
Figure 4: Maximum load current vs. baseplate temperature when conductively
cooled. Note: The system design must provide a suitable thermal path that
maintains the baseplate temperature below 110 °C.
Figure 5: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/μs). Load cap: 1 μF ceramic and 15 μF tantalum
capacitors. Ch 1: Vout, Ch 2: Iout (5A/div).
Figure 6: Output voltage response to step-change in input voltage (250 V/ms,
Vnom-Vmax-Vnom). Load cap: 1 μF ceramic and 15 μF tantalum capacitors. Ch
1: Vout, Ch 2: Vin.
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 5
Input:9-36V
Output:12V
Current:4.1A
Part No.:RQ18120QMx04
RQ18120QMx04 Electrical Characteristics(12.0 Vout)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 18V dc unless otherwise noted; full operating temperature range is -40 °C to +110 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
INPUT CHARACTERISTICS
Maximum Input Current
7.3
A
Vin min; Vout nom; in current limit
No-Load Input Current
100
200
mA
Disabled Input Current
4
6
mA
Response to Input Transient
0.5
V
See Figure 6
Input Terminal Ripple Current
200
mA
RMS
Recommended Input Fuse
30
A
Fast acting external fuse recommended
OUTPUT CHARACTERISTICS
Output Voltage Set Point
11.88
12.00
12.12
V
Output Voltage Regulation
Over Line
±0.1
±0.3
%
Over Load
±0.1
±0.3
%
Over Temperature
-180
180
mV
Total Output Voltage Range
11.70
12.30
V
Over sample, line, load, temperature & life
Output Voltage Ripple and Noise
20 MHz bandwidth; see Note 1
Peak-to-Peak
0
40
80
mV
Full load
RMS
10
20
mV
Full load
A
Operating Output Current Range
0
4.1
Subject to thermal derating
Output DC Current-Limit Inception
4.5
4.9
5.3
A
Output voltage 10% Low
Output DC Current-Limit Shutdown Voltage
5.2
V
Back-Drive Current Limit while Enabled
0.4
A
Negative current drawn from output
Back-Drive Current Limit while Disabled
10
mA
Negative current drawn from output
Maximum Output Capacitance
800
µF
Vout nominal at full load (resistive load)
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
415
mV
50% to 75% to 50% Iout max
Settling Time
400
µs
To within 1% Vout nom
Output Voltage Trim Range
-20
10
%
Across Pins 8&4; Common Figures 3-5; see Note 2
Output Voltage Remote Sense Range
10
%
Across Pins 8&4
Output Over-Voltage Protection
14.0
14.6
15.2
V
Over full temp range
EFFICIENCY
100% Load
90
%
See Figure 1 for efficiency curve
50% Load
89
%
See Figure 1 for efficiency curve
Note 1: Output is terminated with 1 µF ceramic and 15 µF low-ESR tantalum capacitors. For applications requiring reduced output voltage ripple and
noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Trim-up range is limited below 10% at low line and full load.
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 6
Input:9-36V
Output:12V
Current:4.1A
Part No.:RQ18120QMx04
100
6
95
5
Power Dissipation (W)
Efficiency (%)
90
85
80
75
9Vin
70
18Vin
60
3
2
9Vin
1
36Vin
65
4
18Vin
36Vin
0
1
2
3
0
4
Load Current (A)
0
1
2
3
4
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
5
4
4
Iout (A)
Iout (A)
3
2
18Vin
0
36Vin
0
2
1
9Vin
1
3
40
55
70
85
100
50
60
70
80
90
100
110
120
Baseplate Temperature (°C)
Ambient Air Temperature (°C)
Figure 3: Encased Converter (no heatsink) max. output current derating vs.
ambient air temperature for different Input Voltages and 0 LFM airflow (natural
convection airflow).
Figure 4: Maximum load current vs. baseplate temperature when conductively
cooled. Note: The system design must provide a suitable thermal path that
maintains the baseplate temperature below 110 °C.
Figure 5: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/μs). Load cap: 1 μF ceramic and 15 μF tantalum
capacitors. Ch 1: Vout, Ch 2: Iout (1A/div).
Figure 6: Output voltage response to step-change in input voltage (250 V/ms,
Vnom-Vmax-Vnom). Load cap: 1 μF ceramic and 15 μF tantalum capacitors. Ch
1: Vout, Ch 2: Vin.
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 7
Input:9-36V
Output:15V
Current:3.3A
Part No.:RQ18150QMx03
RQ18150QMx03 Electrical Characteristics(15.0 Vout)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 18V dc unless otherwise noted; full operating temperature range is -40 °C to +110 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
INPUT CHARACTERISTICS
Maximum Input Current
8.1
A
Vin min; Vout nom; in current limit
No-Load Input Current
100
200
mA
Disabled Input Current
4
6
mA
Response to Input Transient
1
V
See Figure 6
Input Terminal Ripple Current
200
mA
RMS
Recommended Input Fuse
30
A
Fast acting external fuse recommended
OUTPUT CHARACTERISTICS
Output Voltage Set Point
14.85
15.00
15.15
V
Output Voltage Regulation
Over Line
±0.1
±0.3
%
Over Load
±0.1
±0.3
%
Over Temperature
-225
225
mV
Total Output Voltage Range
14.62
15.38
V
Over sample, line, load, temperature & life
Output Voltage Ripple and Noise
20 MHz bandwidth; see Note 1
Peak-to-Peak
0
40
80
mV
Full load
RMS
10
20
mV
Full load
A
Operating Output Current Range
0
3.3
Subject to thermal derating
Output DC Current-Limit Inception
3.6
4.0
4.3
A
Output voltage 10% Low
Output DC Current-Limit Shutdown Voltage
8.5
V
Back-Drive Current Limit while Enabled
0.25
A
Negative current drawn from output
Back-Drive Current Limit while Disabled
10
mA
Negative current drawn from output
Maximum Output Capacitance
500
µF
Vout nominal at full load (resistive load)
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
600
mV
50% to 75% to 50% Iout max
Settling Time
400
µs
To within 1% Vout nom
Output Voltage Trim Range
-20
10
%
Across Pins 8&4; Common Figures 3-5; see Note 2
Output Voltage Remote Sense Range
10
%
Across Pins 8&4
Output Over-Voltage Protection
16.9
18.1
19.4
V
Over full temp range
EFFICIENCY
100% Load
90
%
See Figure 1 for efficiency curve
50% Load
89
%
See Figure 1 for efficiency curve
Note 1: Output is terminated with 1 µF ceramic and 15 µF low-ESR tantalum capacitors. For applications requiring reduced output voltage ripple and
noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Trim-up range is limited below 10% at low line and full load.
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 8
Input:9-36V
Output:15V
Current:3.3A
Part No.:RQ18150QMx03
100
7
95
6
Power Dissipation (W)
Efficiency (%)
90
85
80
75
9Vin
70
18Vin
60
4
3
2
9Vin
36Vin
65
5
1
18Vin
36Vin
0
1
2
0
3
Load Current (A)
1
0
2
3
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
3.5
3
2
Iout (A)
Iout (A)
2.5
1
9Vin
1.5
0.5
18Vin
36Vin
0
-0.5
40
55
70
85
50
100
60
70
80
90
100
110
120
Baseplate Temperature (°C)
Ambient Air Temperature (°C)
Figure 3: Encased Converter (no heatsink) max. output current derating vs.
ambient air temperature for different Input Voltages and 0 LFM airflow (natural
convection airflow).
Figure 4: Maximum load current vs. baseplate temperature when conductively
cooled. Note: The system design must provide a suitable thermal path that
maintains the baseplate temperature below 110 °C.
Figure 5: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/μs). Load cap: 1 μF ceramic and 15 μF tantalum
capacitors. Ch 1: Vout, Ch 2: Iout (1A/div).
Figure 6: Output voltage response to step-change in input voltage (250 V/ms,
Vnom-Vmax-Vnom). Load cap: 1 μF ceramic and 15 μF tantalum capacitors. Ch
1: Vout, Ch 2: Vin.
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
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Doc.# 005-0006162 Rev. F 04/27/2016
Page 9
Input:9-36V
Output:24V
Current:2A
Part No.:RQ18240QMx02
RQ18240QMx02 Electrical Characteristics(24.0 Vout)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 18V dc unless otherwise noted; full operating temperature range is -40 °C to +110 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
INPUT CHARACTERISTICS
Maximum Input Current
7.8
A
Vin min; trim up; in current limit
No-Load Input Current
100
200
mA
Disabled Input Current
4
6
mA
Response to Input Transient
1.3
V
See Figure 6
Input Terminal Ripple Current
200
mA
RMS
Recommended Input Fuse
30
A
Fast acting external fuse recommended
OUTPUT CHARACTERISTICS
Output Voltage Set Point
23.76
24.00
24.24
V
Output Voltage Regulation
Over Line
±0.1
±0.3
%
Over Load
±0.1
±0.3
%
Over Temperature
-360
360
mV
Total Output Voltage Range
23.40
24.60
V
Over sample, line, load, temperature & life
Output Voltage Ripple and Noise
20 MHz bandwidth; see Note 1
Peak-to-Peak
0
45
90
mV
Full load
RMS
10
20
mV
Full load
A
Operating Output Current Range
0
2
Subject to thermal derating
Output DC Current-Limit Inception
2.2
2.4
2.6
A
Output voltage 10% Low
Output DC Current-Limit Shutdown Voltage
12
V
Back-Drive Current Limit while Enabled
0.11
A
Negative current drawn from output
Back-Drive Current Limit while Disabled
10
mA
Negative current drawn from output
Maximum Output Capacitance
150
µF
Vout nominal at full load (resistive load)
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
1100
mV
50% to 75% to 50% Iout max
Settling Time
400
µs
To within 1% Vout nom
Output Voltage Trim Range
-20
10
%
Across Pins 8&4; Common Figures 3-5
Output Voltage Remote Sense Range
10
%
Across Pins 8&4
Output Over-Voltage Protection
28.1
29.3
30.5
V
Over full temp range
EFFICIENCY
100% Load
90
%
See Figure 1 for efficiency curve
50% Load
91
%
See Figure 1 for efficiency curve
Note 1: Output is terminated with 1 µF ceramic capacitor. For applications requiring reduced output voltage ripple and noise, consult SynQor applications
support (e-mail: [email protected])
Product # RQ18xxxQMXxx
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 10
Input:9-36V
Output:24V
Current:2A
Part No.:RQ18240QMx02
100
6
95
5
Power Dissipation (W)
Efficiency (%)
90
85
80
75
70
9Vin
60
3
2
9Vin
1
18Vin
65
4
18Vin
36Vin
0.0
0.5
1.0
36Vin
1.5
0
2.0
0.0
0.5
1.0
1.5
2.0
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
2.5
2.0
2
Iout (A)
Iout (A)
1.5
1.0
1
0.5
9Vin
0.5
1.5
18Vin
0
36Vin
0.0
40
55
70
85
100
50
60
70
80
90
100
110
120
Baseplate Temperature (°C)
Ambient Air Temperature (°C)
Figure 3: Encased Converter (no heatsink) max. output current derating vs.
ambient air temperature for different Input Voltages and 0 LFM airflow (natural
convection airflow).
Figure 4: Maximum load current vs. baseplate temperature when conductively
cooled. Note: The system design must provide a suitable thermal path that
maintains the baseplate temperature below 110 °C.
Figure 5: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/μs). Load cap: 1 μF ceramic capacitor. Ch 1:
Vout, Ch 2: Iout (1A/div).
Figure 6: Output voltage response to step-change in input voltage (250 V/ms,
Vnom-Vmax-Vnom). Load cap: 1 μF ceramic capacitor. Ch 1: Vout, Ch 2: Vin.
Product # RQ18xxxQMXxx
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Page 11
Technical
Specification
Application Section
RQ18xxxQMXxxx
BASIC OPERATION AND FEATURES
CONTROL FEATURES
This converter series uses a two-stage power conversion topology.
The first stage is a buck-converter that keeps the output voltage
constant over variations in line, load, and temperature. The second
stage uses a transformer to provide the functions of input/output
isolation and voltage step-up or step-down to achieve the output
voltage required.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is on or off. This input is
referenced to the return terminal of the input bus, Vin(-).
Both the first stage and the second stage switch at a fixed frequency
for predictable EMI performance. Rectification of the transformer’s
output is accomplished with synchronous rectifiers. These devices,
which are MOSFETs with a very low on-state resistance, dissipate
far less energy than Schottky diodes. This is the primary reason
that the converter has such high efficiency, even at very low output
voltages and very high output currents.
These converters are offered totally encased to withstand harsh
environments and thermally demanding applications. Conductive
cooling design can be used with heat sink or cold plate cooling
systems. Full power is available with baseplate temperature up
to 110°C.
This series of converters use the industry standard footprint and
pin-out configuration.
ON/OFF
The ON/OFF signal is active low (meaning that a low voltage turns
the converter on). Figure A details four possible circuits for driving
the ON/OFF pin.
REMOTE SENSE(±) (Pins 7 and 5): The SENSE(±) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 7 should be connected to Vout(+) and Pin 5 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(+) - Vout(-)] – [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
Pins 7 and 5 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 8 and 4) to determine when it
should trigger, not the voltage across the converter’s sense leads
(pins 7 and 5). Therefore, the resistive drop on the board should
be small enough so that output OVP does not trigger, even during
load transients.
ON/OFF
5V
Vin(_)
Vin(_)
Remote Enable Circuit
ON/
OFF
Negative Logic
(Permanently Enabled)
5V
ON/OFF
TTL/
CMOS
Open Collector Enable Circuit
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TTL
100pF
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Product # RQ18xxxQMXxx
50k
ON/OFF
Vin(_)
Vin(_ )
50k
-Vin
Figure B: Internal ON/OFF pin circuitry
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Doc.# 005-0006162 Rev. F 04/27/2016
Page 12
Technical
Specification
Application Section
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the
user to adjust the output voltage across the sense leads up or
down according to the trim range specifications.
To decrease the output voltage, the user should connect a resistor
between Pin 6 and Pin 5 (SENSE(-) input). For a desired decrease
of the nominal output voltage, the value of the resistor should be:
Rtrim-down =
(
Δ% =
|
) - 10.22 [kΩ]
511
Δ%
where
Vnominal – Vdesired
Vnominal
| x 100%
To increase the output voltage, the user should connect a resistor
between Pin 6 and Pin 7 (SENSE(+) input). For a desired increase
of the nominal output voltage, the value of the resistor should be:
Rtrim-up =
(
5.11VOUT x (100+Δ%)
1.225Δ%
-
511
Δ%
- 10.22
)
[kΩ]
Trim graphs show the relationship between the trim resistor value
and Rtrim-up and Rtrim-down, showing the total range the output
voltage can be trimmed up or down.
Note: The TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection
circuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the Trim pin.
The node is internally filtered to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout, due
to both trimming and remote load voltage drops, should not be
greater than that specified for the output voltage trim range.
RQ18xxxQMXxxx
Protection Features
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping to avoid
an input system instability problem, which is described in more
detail in the application note titled “Input System Instability” on
www.synqor.com. The lockout circuitry is a comparator with DC
hysteresis. When the input voltage is rising, it must exceed the
typical “Turn-On Voltage Threshold” value* before the converter
will turn on. Once the converter is on, the input voltage must
fall below the typical Turn-Off Voltage Threshold value before the
converter will turn off.
Output Current Limit: The maximum current limit remains
constant as the output voltage drops. However, once the
impedance of the load across the output is small enough to make
the output voltage drop below the specified Output DC CurrentLimit Shutdown Voltage, the converter turns off.
The converter then enters a “hiccup mode” where it repeatedly
turns on and off at a 5 Hz (nominal) frequency with a 5% duty
cycle until the short circuit condition is removed. This prevents
excessive heating of the converter or the load board.
Output Over-Voltage Limit: If the voltage across the output
pins exceeds the Output Over-Voltage Protection threshold, the
converter will immediately stop switching. This prevents damage
to the load circuit due to 1) excessive series resistance in output
current path from converter output pins to sense point, 2) a
release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high the
output voltage will rise in response to these conditions. After 200
ms the converter will automatically restart.
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*.
Transient and Surge Protection: The wide input range of the
RailQor line of converters covers all transient requirements of EN
50155. For short duration transients and surges found in other
standards (such as RIA 12) that exceed the maximum input voltage
rating of the converter, SynQor has provided a design guide for a
transient suppression circuit. Please consult the application note
"Rail Power Applications" on our website www.synqor.com.
* See Electrical Characteristics page.
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Page 13
Technical
Specification
RQ18xxxQMXxxx
Application Section
APPLICATION CONSIDERATIONS
Input System Instability: This condition can occur because any
DC-DC converter appears incrementally as a negative resistance
load. A detailed application note titled “Input System Instability” is
available on the SynQor website which provides an understanding
of why this instability arises, and shows the preferred solution for
correcting it.
Application Circuits: Figure C below provides a typical circuit
diagram which details the input filtering and voltage trimming.
Vout(+)
Vin(+)
Vin
External
Input
Filter
Electrolytic
Capacitor
Vsense(+)
Rtrim-up
Trim
ON/OFF
or
Rtrim-down
Vsense(_)
Vin(_)
Cload
Iload
Vout(_)
Figure C: Typical application circuit (negative logic unit, permanently enabled).
Input Filtering and External Input Capacitance: Figure
D below shows the internal input filter components. This filter
dramatically reduces input terminal ripple current, which otherwise
could exceed the rating of an external electrolytic input capacitor.
The recommended external input capacitance is specified in the
Input Characteristics section on the Electrical Specifications page.
More detailed information is available in the application note
titled “EMI Characteristics” on the SynQor website.
L
Vin(+)
C
Vin(_)
Figure D: Internal Input and Output Filter Diagram (component values listed on specifications page).
L
Vin(+)
C
Product # RQ18xxxQMXxx
Vin(_)
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Page 14
Technical
Specification
RQ18xxxQMXxxx
Application Section
Startup Inhibit Period: The Startup Inhibit Period ensures that the
converter will remain off for approximately 200 ms when it is shut down for
any reason. When an output short is present, this generates a 5 Hz “hiccup
mode,” which prevents the converter from overheating. In all, there are
six ways that the converter can be shut down, initiating a Startup Inhibit
Period:
•
•
•
•
•
•
When the ON/OFF pin goes high after t2, the Startup Inhibit Period has
elapsed, and the output turns on within the typical Turn-On Time.
Thermal Considerations: The maximum operating base-plate
temperature, TB, is 110 ºC. As long as the user’s thermal system keeps TB
< 110 ºC, the converter can deliver its full rated power.
Input Under-Voltage Lockout
Output Over-Voltage Protection
Over Temperature Shutdown
Current Limit
Short Circuit Protection
Turned off by the ON/OFF input
A power derating curve can be calculated for any heatsink that is attached
to the base-plate of the converter. It is only necessary to determine the
thermal resistance, RTH-BA, of the chosen heatsink between the base-plate
and the ambient air for a given airflow rate. This information is usually
available from the heatsink vendor. The following formula can the be used
to determine the maximum power the converter can dissipate for a given
thermal condition if its base-plate is to be no higher than 110 ºC.
Figure E shows three turn-on scenarios, where a Startup Inhibit Period is
initiated at t0, t1, and t2:
Pdiss
max
=
110 ºC - TA
RTH-BA
Before time t0, when the input voltage is below the UVL threshold, the
unit is disabled by the Input Under-Voltage Lockout feature. When the
input voltage rises above the UVL threshold, the Input Under-Voltage
Lockout is released, and a Startup Inhibit Period is initiated. At the end
of this delay, the ON/OFF pin is evaluated, and since it is active, the unit
turns on.
This value of power dissipation can then be used in conjunction with the
data shown in Figure 2 to determine the maximum load current (and
power) that the converter can deliver in the given thermal condition.
At time t1, the unit is disabled by the ON/OFF pin, and it cannot be
enabled again until the Startup Inhibit Period has elapsed.
For convenience, power derating curves for an encased converter without
a heatsink are provided for each output voltage.
Vin
Under-Voltage Lockout
Turn-On Threshold
ON/OFF
(neg logic)
ON
OFF ON
OFF
ON
9ms
(initial start-up
inhibit period)
Vout
200ms
215ms
t1
t0
(typical turn on time)
(typical start-up
inhibit period)
200ms
t2
t
Figure E: Startup Inhibit Period (turn-on time not to scale)
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Page 15
Technical
Specification
Application Section
Designing for Maximizing Available Power: RailQor products
have been designed for full power operation in demanding thermal
environments. However, there are techniques that can be applied
external to the converter to ensure the best possible thermal
performance. These include correctly applying a heatsink to the
baseplate of the converter and maximizing the heat transferred
through the pins. The following discussions are only guidelines
and may not be necessary depending on the application
Optimal Heatsink Application: There are two key components
to maximizing the thermal dissipation when using a heatsink. One
is minimizing the thermal resistance between the converter and
the heatsink itself. There are imperfections between the mating
surfaces that reduce contact area between the two. A suitable
thermally conductive interface material should be used to maintain
a good thermal connection. A commonly used example is thermal
grease. When utilizing the threaded inserts on the baseplate of
a SynQor converter, care must be taken not to exceed the torque
or screw depth guidelines found in the mechanical diagram. Two,
airflow must be directed to pass between the fins of the heatsink
to maximize the surface area for heat removal.
Heatsinks are often available with both transverse and longitudinal
fin direction to allow system flexibility. Care should be taken to
avoid large external components surrounding the converter from
blocking airflow.
Figure F: Example of properly soldered pin joint
Product # RQ18xxxQMXxx
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RQ18xxxQMXxxx
Layout Considerations: Significant performance improvement
can be made by designing a printed circuit board to properly sink
heat away from the converter through its pins. The first step is
to ensure a correctly formed solder joint at each pin. A smooth
fillet and complete barrel fill should be observed at the boundary
of pin and mounting hole to ensure maximum heat conduction
from pin to board (Figure F). It is worth noting here that encased
SynQor products are not compatible with reflow processes as it
may disrupt the placement of internal components.
The board itself should also have as many layers and as high of
copper weight as is practical for the application. Large ground
and power planes are best as the most heat will be conducted
through the large power pins of the converter on both input
and output sides. The heat must also have a path to conduct
from the copper planes of the board to the outside environment.
The typical FR4 material used in construction of a printed circuit
board is greater than 1000 times less thermally conductive than
copper and will act as an insulator between each copper plane.
To mitigate this, generous use of thermal vias is recommended
in the board area surrounding and below the converter. A proper
density of vias allows heat to conduct from the board to the air
while maintaining a large amount of copper area to conduct to
the vias. For reference, boards used in SynQor thermal testing
are 6 layer, 2 oz. copper boards with 50 mil diameter thermal
vias at a density of 36/in2 (Figure G).
Figure G: Image of thermal via layout surrounding converter in test board
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 16
Technical
Specification
Standard Mechanical Diagram
1.536 [39.01]
1.030 [26.16]
RQ18xxxQMXxxx
0.450 [11.43]
SEATING
PLANE HEIGHT
0.500 0.025
[12.7
0.63]
PIN EXTENSION
0.180
[4.57]
0.150 [3.81]
4
5
6
7
8
TOP VIEW
1.860 2.386
[47.24] [60.60]
2.000
[50.80]
0.004 [0.10]
0.08
[2.0]
3
1
0.215
[5.46
0.020
0.50]
1
0.300 [7.62]
0.600 [15.24]
THREADED INSERT
SEE NOTE 1
(4 PLCS)
NOTES
1) APPLIED TORQUE SHOULD NOT EXCEED 6in-lb (0.7Nm).
M3 SCREW SHOULD NOT EXCEED 0.100" (2.54mm) DEPTH
BELOW THE SURFACE OF THE BASEPLATE.
PIN DESIGNATIONS
Pin
Name
Function
1
Vin(+)
Positive input voltage
2
ON/OFF
3
Vin(–)
2) BASEPLATE FLATNESS TOLERANCE IS 0.004" (.10mm)
3) PINS 1-3. 5-7 ARE 0.040" (1.02mm) DIA. WITH 0.080"
(2.03mm) DIA. STANDOFFS.
4) PINS 4 AND 8 ARE 0.062" (1.57mm) DIA. WITH 0.100"
(2.54mm) DIA STANDOFFS
5) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) WEIGHT: 2.9 oz. (84g)
7) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
Product # RQ18xxxQMXxx
2
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4
5
6
7
8
Vout(–)
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
Negative input voltage
Negative output voltage
SENSE(–) Negative remote sense (See note 1)
TRIM
Output voltage trim (See note 2)
SENSE(+) Positive remote sense (See note 3)
Vout(+)
Positive output voltage
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely
or at the converter.
2)
Leave TRIM pin open for nominal output voltage.
3)
SENSE(+) should be connected to Vout(+) either remotely
or at the converter.
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Doc.# 005-0006162 Rev. F 04/27/2016
Page 17
Technical
Specification
Flanged Mechanical Diagram
2.200 [55.88]
2.000 [50.80]
1.536 [39.01]
RQ18xxxQMXxxx
0.450 [11.4]
PIN
EXTENSION
0.180
[4.6]
SEATING
PLANE HEIGHT
.500±.025
[12.7±0.63]
0.150 [3.8]
4 5 6 7 8
0.010 [0.25]
TOP VIEW
2.386
[60.60]
1.300
[33.02]
0.36
[9.1]
2.000
[50.8]
2.066
[52.48]
3
2
1
1
0.70
[17.8]
0.300 [7.6]
FLANGE
THICKNESS
0.125
[3.2]
.130 [3.30]
SEE NOTE 1
(6 PLCS)
0.600 [15.2]
NOTES
PIN DESIGNATIONS
1) APPLIED TORQUE SHOULD NOT EXCEED 6in-lb (0.7Nm)
Pin
Name
Function
1
Vin(+)
Positive input voltage
2
ON/OFF
3
Vin(–)
2) BASEPLATE FLATNESS TOLERANCE IS 0.010" (.25mm) TIR FOR
SURFACE.
3) PINS 1-3. 5-7 ARE 0.040" (1.02mm) DIA. WITH 0.080"
(2.03mm) DIA. STANDOFFS.
4) PINS 1-3. 5-7 ARE 0.040" (1.02mm) DIA. WITH 0.080" (2.03mm)
DIA. STANDOFFS.
5) PINS 4 AND 8 ARE 0.062" (1.57mm) DIA. WITH 0.100"
(2.54mm) DIA STANDOFFS
6) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
7) WEIGHT: 3.2 oz (90 g)
8) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
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4
5
Vout(–)
7
Negative input voltage
Negative output voltage
SENSE(–) Negative remote sense (See note 1)
6
8
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
TRIM
Output voltage trim (See note 2)
SENSE(+) Positive remote sense (See note 3)
Vout(+)
Positive output voltage
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely
or at the converter.
2)
Leave TRIM pin open for nominal output voltage.
3)
SENSE(+) should be connected to Vout(+) either remotely
or at the converter.
www.SynQor.com
Doc.# 005-0006162 Rev. F 04/27/2016
Page 18
Technical
Specification
Standards & Qualifications
RQ18xxxQMXxxx
STANDARDS COMPLIANCE
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
EN 60950-1:2006/A2:2013
Basic insulation
UL 60950-1:2007/A2:2014
CAN/CSA C22.2 No. 60950-1:2007/A2:2014
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
# Units
Test Conditions
QUALIFICATION TESTING
Vibration
5
EN 61373:1999 Category I, Class B, Body mounted
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
Cold
5
EN 60068-2-1:2007
Dry Heat
5
EN 60068-2-2:2007
Mechanical Shock
5
EN 61373:1999 Category I, Class B, Body mounted
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
Damp Heat, Cyclic
5
EN 60068-2-30:2005
Solderability
15 pins
MIL-STD-883, method 2003
Note: Governing Standard BS EN 50155:2007 Railway applications - Electronic equipment used on rolling stock
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Page 19
Technical
Specification
RQ18xxxQMXxxx
Ordering Information
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 characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
RQ 1 8 0 5 0 Q M C 1 0 N R S - G
6/6 RoHS
Input
Voltage
Output
Voltage
RQ18050QMw10xyz
RQ18120QMw04xyz
RQ18150QMw03xyz
9-36V
9-36V
9-36V
5V
12V
15V
Max
Output
Current
10A
4.1A
3.3A
RQ18240QMw02xyz
9-36V
24V
2A
Model Number
Options
(see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Output Voltage
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.
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
The following options must be included in place of the w x y z spaces in the
model numbers listed above. Not all combinations make valid part numbers,
please contact SynQor for availability.
Thermal Design
Options Description
Enable Logic
Pin Style
C - Encased
V - Encased with Flanged
Baseplate
N - Negative
R - 0.180"
Feature Set
S - Standard
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].
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # RQ18xxxQMXxx
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
PATENTS
SynQor holds numerous U.S. patents, one or more of which apply to most of its power conversion
products. Any that apply to the product(s) listed in this document are identified by markings on
the product(s) or on internal components of the product(s) in accordance with U.S. patent laws.
SynQor’s patents include the following:
5,999,417
6,222,742
6,545,890
6,594,159
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
8,644,027
9,143,042
WARRANTY
SynQor offers a two (2) year limited warranty. Complete warranty information
is listed on our website or is available upon request from SynQor.
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Doc.# 005-0006162 Rev. F 04/27/2016
Page 20