25A - SynQor

Technical
Specification
PQ60120QEx25
35-75V
12V
25A
300W
2250V dc
Quarter-brick
Input
Output
Current
Max Power
Isolation
DC-DC Converter
The PQ60120QEx25 PowerQor Exa Quarter-brick
converter is a next-generation, board-mountable,
isolated, fixed switching frequency DC/DC converter.
The Exa series offers industry leading power density for
standard isolated DC/DC converters with both a wide
input range and a tightly regulated output. Targeted
for use in intermediate bus architectures, this module
supplies an isolated step down voltage from 35-75V
to 12V and provides more available power and higher
efficiency than most competitive bus converters. This
converter is available in openframe and baseplated
versions. RoHS Compliant (see last page).
Protection Features
• Input under-voltage lockout disables converter at low Vin conditions
• Output current limit and short circuit protection for converter and
load from damage and consequent hazardous conditions
• Protection from permanent damage and hazardous conditions
• Active back bias limit
• Smooth startup with external load induced pre-bias
• Latching output OVP protects load from damaging voltages
• Thermal shutdown protects converter from abnormal conditions
Mechanical Features
• Industry standard pin-out configuration
• Standard Size Open Frame:1.45" x 2.30" (36.8 x 58.4mm)
• Total Open Frame height only 0.417” (10.59mm)
permits better airflow and smaller card pitch
• Open Frame Weight: 1.5 oz. (42g)
PQ60120QEx25 Model
Operational Features
• High efficiency, >96% at full rated load current
• Delivers 25A of Iout (300W) with minimal derating - no heatsink
required
• Wide input voltage range: 35-75V
• Input voltage transient capability: 100V, 100ms
• Fixed frequency switching provides predictable EMI
• No minimum load requirement
• Wide output voltage trim range (-50% to +5%)
• Flanged pins designed to permit surface mount soldering,
avoid wave solder using FPiP technique on open frame units
Control Features
• On/Off control referenced to input side
• Positive and negative logic options are available
Page No.
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # PQ60120QEx25
Contents
Phone 1-888-567-9596
Mechanical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standards & Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 1
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Open Frame Mechanical Diagram
1.450 [36.8]
.600 [15.24]
.450 [11.43]
.300 [7.62]
.150 [3.81]
.417 ±.024
[10.59 ±0.6]
Overall Height
.180
[4.57]
See Note 3
8 7 6 5 4
2.30 [58.4]
2.00 [50.8]
1
2
3
.14 [3.6]
.43 [10.8]
.030 ±.024
[0.76 ±0.6]
Bottomside
Clearance
.300 [7.62]
.600 [15.24]
NOTES
1)
2)
3)
4)
5)
6)
7)
PIN DESIGNATIONS
Pins 1-3, 5-7 are 0.40" (1.02mm) dia. with 0.080" (2.03mm)
standoff shoulders.
Pins 4 & 8 are 0.062" (1.57mm) dia. with 0.100" (2.54mm)
standoff shoulders.
Other pin extension lengths available.
All Pins: Material - Copper Alloy
Finish: Matte Tin over Nickel Plate
Undimensioned components are shown for visual reference only.
Open Frame Weight: 1.5 oz. (42g)
Workmanship: Meets or exceeds IPC-A-610 Class II
Pin
Name
1
Vin(+)
2
ON/OFF
3
4
5
6
7
8
Vin(-)
Vout(-)
SENSE(–)
TRIM
SENSE(+)
Vout(+)
Function
Positive input voltage
TTL input to turn converter on and off, referenced
to Vin(–), with internal pull up.
Negative input voltage
Negative output voltage
Negative remote sense (See note 1)
Output voltage trim (See note 2)
Positive remote sense (See note 3)
Positive output voltage
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely or at the converter.
Product # PQ60120QEx25
Phone 1-888-567-9596
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.# 005-2QE612J Rev. G
01/14/15
Page 2
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Baseplated Mechanical Diagram
1.45 [36.7]
1.03 [26.2]
.600 [15.24]
.450 [11.43]
.300 [7.62]
.21
[5.3]
.150 [3.81]
.180
[4.57]
SEE NOTE 6
.22
[5.6]
87 6 5 4
SIDE VIEW
TOP VIEW
2.30
[58.4]
2.00
[50.8]
1.86
[47.2]
M3 THREADED INSERTS
4 PLACES
SEE NOTES 1 & 2
1
2
030 ±.024
[0.76 ±0.6]
BOTTOMSIDE
CLEARANCE
3
.14 [3.6]
.496 ±.014
[12.6 ±0.35]
OVERALL HEIGHT (RSS)
.43 [10.8]
.300 [7.62]
.600 [15.24]
NOTES
1)
2)
3)
4)
5)
6)
7)
PIN DESIGNATIONS
M3 screws used to bolt unit's baseplate to other surfaces
such as heatsink must not exceed 0.100" (2.54mm) depth
below the surface of the baseplate.
Applied torque per screw should not exceed 6in-lb (0.7Nm).
Baseplate flatness tolerance is 0.004" (.10mm) TIR for surface.
Pins 1-3, 5-7 are 0.40" (1.02mm) dia. with 0.080" (2.03mm)
standoff shoulders.
Pins 4 & 8 are 0.062" (1.57mm) dia. with 0.100" (2.54mm)
standoff shoulders.
Other pin extension lengths available.
All Pins: Material - Copper Alloy
Finish: Matte Tin over Nickel Plate
8)
Undimensioned components are shown for visual reference only.
9)
Weight: 1.6 oz. (46g)
10) All dimensions in inches (mm)
Tolerances: X.XXin +/-0.02 (X.Xmm +/-0.5mm)
10)
X.XXXin +/-0.010 (X.XXmm +/-0.25mm)
11) Workmanship: Meets or exceeds IPC-A-610 Class II
Product # PQ60120QEx25
Phone 1-888-567-9596
Pin
Name
1
Vin(+)
2
ON/OFF
3
4
5
6
7
8
Vin(-)
Vout(-)
SENSE(–)
TRIM
SENSE(+)
Vout(+)
Function
Positive input voltage
TTL input to turn converter on and off, referenced
to Vin(–), with internal pull up.
Negative input voltage
Negative output voltage
Negative remote sense (See note 1)
Output voltage trim (See note 2)
Positive remote sense (See note 3)
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.# 005-2QE612J Rev. G
01/14/15
Page 3
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Technical Specifications
PQ60120QEx25 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage - Input to Output
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Maximum Input Current
No-Load Input Current
Disabled Input Current
Response to Input Transient
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Recommended External Input Capacitance
Input Filter Component Values (C1\L\C2)
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance Electrolytic
EFFICIENCY
100% Load
50% Load
Product # PQ60120QEx25
Typ.
-1
-40
-55
-2
Max.
Units Notes & Conditions
100
80
100
2250
100
125
18
V
V
V
V
°C
°C
V
Continuous
Continuous
100ms transient, square wave
Basic insulation, Pollution Degree 2
100V transient for 100ms
35
48
75
V
31.5
28.0
2.5
33.0
29.5
3.5
34.5
31.0
4.5
10.0
100
40
V
V
V
A
mA
mA
V
mA
mA
A
µF
70
20
1.0
5
60
10
15
100
22\1.5\6.0
11.72
12.00
±1.0\120
±1.0\120
±90
11.58
50
10
0
27
13
0
95.5
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32
5.0
18
0.5
0.25V/μs input transient
RMS thru 4.7μH inductor
RMS
Fast acting external fuse recommended
Typical ESR 0.1-0.2Ω; Figure 13
nF\µH\µF Internal values; see Figure D
12.28
V
±240
12.42
%\mV
%\mV
mV
V
100
40
25
37
96.0
96.5
www.synqor.com
23
1
12
100% Load, 35V Vin, trimmed up 5%
See note 1
See note 1
mV
mV
A
A
V
A
mA
mF
Over sample, line, load, temperature & life
500MHz bandwidth; see Note 2
Full load
Full load
Subject to thermal derating
Output Voltage 10% Low
See note 3
Negative current drawn from output
Negative current drawn from output
Nominal Vout at full load (resistive load)
%
%
Figures 1 - 2
Figures 1 - 2
Doc.# 005-2QE612J Rev. G
01/14/15
Page 4
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Technical Specifications
PQ60120QEx25 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
Step Change in Output Current (0.1A/µs)
Step Change in Output Current (5A/µs)
Settling time
Turn-On Transient
Turn-On Time
24
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance (input to output)
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
FEATURE CHARACTERISTICS
Switching Frequency Regulation Stage
235.6
Switching Frequency Isolation Stage
117.8
ON/OFF Control (Option P)
Off-State Voltage
-2
On-State Voltage
4.0
ON/OFF Control (Option N)
Off-State Voltage
4.0
On-State Voltage
-2
ON/OFF Control (Either Option)
ON/OFF Control Hysteresis
Pull-Up Voltage
4.75
Pull-Up Resistance
Output Voltage Trim Range
-50
Output Over-Voltage Protection
113
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
Note
Note
Note
Note
1:
2:
3:
4:
Max.
350
350
1
mV
mV
ms
50% to 75% to 50% Iout max
50% to 75% to 50% Iout max, 470 μF load cap
To within 1% Vout nom
ms
%
Full load, ON/OFF to Vout=90% nom.
12 mF load capacitance, Iout = 0A
V
MΩ
pF
See Note 4
125
125
125
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 3 - 6 for derating curves
240.4
120.2
kHz
kHz
Over sample, temp & life
Over sample, temp & life
1.0
18
V
18
1.0
V
27
2
30
2250
30
1000
238.0
119.0
Units Notes & Conditions
Application notes; Figures A & B
1.5
5
10
118
120
10
5.25
+5
123
2.7
2.5
°C
V
kΩ
%
%
°C
°C
Measured across Pins 8 & 4; see trim section
Over Full Temperature Range; % of nominial Vout
Average PCB Temperature
106 Hrs. TR-NWT-000332; 80% load, 300LFM, 40°C Ta
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40°C Ta
106 Hrs. See our website for details
Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference.
For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
If the output voltage falls below the Output DC Current Limit Shutdown Voltage for more than 50ms, then the unit will enter into hiccup mode, with a
Higher values of isolation capacitance can be added external to the module.
Product # PQ60120QEx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 5
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Technical Specifications
Standards Compliance & Qualification Testing
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R2011-12
Basic insulation
EN60950-1/A2:2013
CAN/CSA-C22.2 No. 60950-1/A1:2011
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
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # PQ60120QEx25
# Units
32
5
5
10
5
5
5
15 pins
Phone 1-888-567-9596
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x, y and z axis
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
85 °C, 95% RH, 1000 hours, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
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Doc.# 005-2QE612J Rev. G
01/14/15
Page 6
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Technical Figures
100
18
16
14
Power Dissipation (W)
Efficiency (%)
95
90
85
35Vin
48Vin
12
10
8
6
4
35Vin
48Vin
2
75Vin
75Vin
0
80
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
0
25
Load Current (A)
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
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.
Figure 3: Maximum output power derating curves vs. ambient air temperature
for airflow rates of 100 LFM through 400 LFM with air flowing across the
converter from pin 1 to pin 3 (nominal input voltage).
Figure 4: Thermal plot of converter at 24A load current (288W) with 55°C air
flowing at the rate of 200 LFM. Air is flowing across the converter sideways from
pin 1 to pin 3 (nominal input voltage).
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 5: Maximum output power derating curves vs. ambient air temperature
for airflow rates of 100 LFM through 400 LFM with air flowing from from input
to output (nominal input voltage).
Product # PQ60120QEx25
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Figure 6: Thermal plot of converter at 23A load current (276W) with 55°C air
flowing at the rate of 200 LFM. Air is flowing across the converter from input to
output (nominal input voltage).
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Doc.# 005-2QE612J Rev. G
01/14/15
Page 7
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Technical Figures
Figure 7: Turn-on transient at full load (resistive load) (10 ms/div).
Ch 1: Vout (5V/div)
Ch 2: ON/OFF input (5V/div)
Figure 8: Turn-on transient at zero load (10 ms/div).
Ch 1: Vout (5V/div)
Ch 2: ON/OFF input (5V/div)
Figure 9: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/μs). Load cap: 1uF ceramic and 10uF tantalum
capacitors. Top trace: Vout (500mV/div), Bottom trace: Iout (10A/div).
Figure 10: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5A/μs). Load cap: 470μF, 15 mΩ ESR tantalum
capacitor. Top trace: Vout (500mV/div), Bottom trace: Iout (10A/div).
Figure 13
4.7 µH
source
impedance
Figure 12
Figure 14
iS
VSOURCE
iC
100 µF,
0.2Ω ESR
electrolytic
capacitor
DC/DC
Converter
VOUT
1 µF
10 µF,
ceramic 100mΩ ESR
capacitor
tantalum
capacitor
Figure 11: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Fig 12), Input Reflected Ripple Current
(Fig 13) and Output Voltage Ripple (Fig 14).
Product # PQ60120QEx25
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Figure 12: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 4.7μH source impedance and 100μF electrolytic
capacitor (100 mA/div). See Figure 11.
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Doc.# 005-2QE612J Rev. G
01/14/15
Page 8
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Technical Figures
Figure 14: Output voltage ripple at nominal input voltage and rated load current
(20 mV/div). Load capacitance: 1μF ceramic capacitor and 10μF tantalum
capacitor. Bandwidth: 500 MHz. See Figure 11.
Figure 15: Output voltage response to step-change in input voltage (50V to 100V
in 200μs). Load cap: 470μF, 15 mΩ ESR tantalum capacitor. Ch 1: Vout (500mV/
div), Ch 2: Vin (20V/div), at zero load current.
Figure 16: Load current (10A/div) as a function of time when the converter
attempts to turn on into a 10 mΩ short circuit. Bottom trace (10ms/div) is an
expansion of the on-time portion of the top trace (100ms/div).
Output Voltage (V)
Figure 13: Input reflected ripple current, is, through a 4.7μH source inductor,
using a 100μF input capacitor, at nominal input voltage and rated load current
(10 mA/div). See Figure 11.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OVP Shutdown
36Vin
48Vin
75Vin
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit curves
and OVP shutdown point.
Product # PQ60120QEx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 9
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Applications Section
BASIC OPERATION AND FEATURES
CONTROL FEATURES
This converter series uses a two-stage power conversion topology.
The first stage 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 stepdown to achieve the low 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
significantly less energy than Schottky diodes, enabling the
converter to achieve high efficiency.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation in many applications; however,
adding a heatsink provides improved thermal derating performance
in extreme situations. To further withstand harsh environments
and thermally demanding applications, certain models are available
baseplated or totally encased. See Ordering Information page for
available thermal design options.
SynQor quarter-brick converters use the industry standard footprint
and pin-out.
ON/OFF
Vin(_)
Vin(_)
Remote Enable Circuit
ON/OFF
ON/OFF
Negative Logic
(Permanently
Enabled)
5V
ON/OFF
TTL/
CMOS
Vin(_)
Open Collector Enable Circuit
REMOTE SENSE Pins 7(+) and 5(-): The SENSE(+) and
SENSE(-) inputs correct for voltage drops along the conductors that
connect the converter’s output pins to the load.
Pin 7 should connect to Vout(+) and Pin 5 should connect to Vout() at the point on the board where regulation is desired. 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.
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. SynQor uses industry
standard trim equations.
To decrease the output voltage, the user should connect a resistor
between Pin 6 (TRIM) and Pin 5 (SENSE(-) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be:
Positive Logic
(Permanently
Enabled)
Rtrim-down =
where
ON/OFF
Vin(_)
Vin(_)
In negative logic versions, the ON/OFF signal is active low (meaning
that a low voltage turns the converter on). In positive logic versions,
the ON/OFF input is active high (meaning that a high voltage turns
the converter on). Fig A details possible circuits for driving the ON/
OFF pin. See Ordering Information page for available enable logics.
Direct Logic Drive
(
511%
– 10.22
Δ%
) kΩ
Vnominal – Vdesired
× 100%
Vnominal
To increase the output voltage, the user should connect a resistor
between Pin 6 (TRIM) and Pin 7 (SENSE(+) input). For a desired
increase of the nominal output voltage, the value of the resistor
should be:
Δ% =
Rtrim-up = 5.11
Figure A: Various Circuits for Driving the ON/OFF Pin.
[
|
(
|
Vnominal
1.225
–2
) × Vdesired + Vnominal
Vdesired – Vnominal
]
kΩ
The Trim Graph in Figure B shows 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.
Product # PQ60120QEx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 10
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Applications Section
0
5
10
15
20
25
30
35
40
45
50
1,000,000.0
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.
100,000.0
Trim Resistance (kOhms)
It is not necessary for the user to add capacitance at the TRIM pin.
The node is internally filtered to eliminate noise.
10,000.0
1,000.0
100.0
10.0
1.0
0.1
% Increase in Vout
% Decrease in Vout
Figure B: Trim Graph.
PROTECTION FEATURES
Input Under-Voltage Lockout (UVLO): 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 the SynQor website. When the input is rising, it must exceed the
typical “Turn-On Voltage Threshold”* before the converter will turn
on. Once the converter is on, the input must fall below the typical
"Turn-Off Voltage Threshold"* before the converter will turn off.
Output Current Limit (OCP): If the output current exceeds
the “Output DC Current Limit Inception” value*, then a fast linear
current limit controller will reduce the output voltage to maintain
a constant output current. If as a result, the output voltage falls
below the “Output DC Current Limit Shutdown Voltage”* for more
than 50 ms, then the unit will enter into hiccup mode, with a 500
ms off-time. The unit will then automatically attempt to restart.
Back-Drive Current Limit: If there is negative output current
of a magnitude larger than the “Back-Drive Current Limit while
Enabled” specification*, then a fast back-drive limit controller will
increase the output voltage to maintain a constant output current.
If this results in the output voltage exceeding the “Output OverVoltage Protection” threshold*, then the unit will shut down.
Output Over-Voltage Limit (OVP): 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 500 ms the converter will automatically restart
for all but the S Feature Set option, which is latching and will not
restart until input power is cycled or the ON/OFF input is toggled.
During an output over-voltage condition, the converter's LED will
illuminate. For units with latching OVP (S Feature Set), once the
over-voltage condition has been removed the LED will flash steadily
until the input power or the ON/OFF input is toggled.
Over-Temperature Shutdown (OTP): A thermister 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”*.
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 500 ms when it is
shut down due to a fault. This generates a 2 Hz “hiccup mode,”
preventing the converter from overheating. There are multiple ways
the converter can be shut down, initiating a Startup Inhibit Period:
•
•
•
•
Output Over-Voltage Protection
Current Limit
Short Circuit Protection
Disabling via ON/OFF input (excluding PQ60120QE & PQ60120QZ)
* See Electrical Characteristics section.
Product # PQ60120QEx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 11
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Applications 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: A typical circuit diagram, Figure C below
details the input filtering and voltage trimming.
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 of the Electrical Specifications. More
detailed information is available in the application note titled “EMI
Characteristics” on the SynQor website.
Output Filtering and External Output Capacitance: The
internal output filter components are shown in Figure D below. This
filter dramatically reduces output voltage ripple. Some minimum
external output capacitance is required, as specified in the Output
Characteristics area of the Electrical Characteristics section. No
damage will occur without this capacitor connected, but peak
output voltage ripple will be much higher.
Thermal Considerations: For baseplated and encased versions,
the max operating baseplate temperature, TB, is 100 ºC. Refer to
the Thermal Derating Curves in the Technical Figures section to
see the available output current at baseplate temperatures below
100 ºC.
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, RTHBA, of the chosen heatsink
between the baseplate 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 100 ºC.
Pdiss
max
Vin
100 ºC - TA
RTHBA
This value of maximum power dissipation can then be used in
conjunction with the data shown in the Power Dissipation Curves
in the Technical Figures section to determine the maximum load
current (and power) that the converter can deliver in the given
thermal condition.
For convenience, Thermal Derating Curves are provided in the
Technical Figures section.
Vin(+)
Vout(+)
Vsense(+)
Electrolytic
Capacitor
External
Input
Filter
=
ON/OFF
Trim
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure C: Typical Application Circuit (negative logic unit, permanently enabled).
Lin
Vin(+)
Vout(+)
C1
C2
Regulation
Stage
Current
Sense
Isolation
Stage
Vin(_)
Vout(-)
Figure D: Internal Input and Output Filter Diagram (component values listed
in Electrical Characteristics section).
Product # PQ60120QEx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 12
Input: 35-75V
Output: 12V
Current: 25A
Package: Quarter-brick
Applications Section
140
Vout Step Size (mV)
120
100
80
60
40
= 12.0 Vout
= 10.0 Vout
20
≤ 8.75 Vout
0
35
40
45
50
55
60
65
70
75
Vin (V)
Figure E: Output Voltage Resolution example for 12Vout units.
Figure F: Smallest Possible Vout Step example for 12Vout unit at 48Vin..
Limited Output Voltage Resolution: The internal voltage
control feedback loop 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.
The size of each step is well determined, and is shown in Figure E.
A close-up picture of a single step is shown in Figure F. Stepping
will not occur under steady state conditions.
Active Trim Not Recommended: It is important to note that
external feedback control using the sense or trim pins will cause
sustained stepping. External current share or active trim circuits
contain a separate reference voltage. After this external feedback
has taken control, the actual output voltage can still differ from
the external reference voltage by as much as the step size. If the
external feedback loop integrates this error volt-age, it will cause a
limit cycle oscillation. For this reason, external feedback using the
sense and trim pins is not recommended.
Product # PQ60120QEx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QE612J Rev. G
01/14/15
Page 13
Technical
Specification
PQ60120QEx25
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.
PQ 6 0 1 2 0 Q E A 2 5 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
Input Voltage
PQ60120QEw25xyz-G
35-75V
Output
Voltage
12V
Max Output
Current
25A
Output Current
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
Options Description: w x y z
Thermal Design
Enable Logic Pin Style
Package Size
Output Voltage
A - Open Frame
B - Threaded Baseplated
Input Voltage
N - Negative
P - Positive
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.
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
Feature Set
S - Standard
Not all combinations make valid part numbers, please contact SynQor for
availability. See the Product Summary web page for more options.
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]
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.
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ60120QEx25
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
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
8,644,027
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.# 005-2QE612J Rev. G
01/14/15
Page 14