SYNQOR PQ60280FTA26NNS-G

Technical
S pecification
PQ60280FTA26
48V in
28Vout
26Amp
2250Vdc
Full-brick
Input
Output
Current
Isolation
DC/DC Conver ter
The PQ 6028 0FTA26 Po we r Qor ® Te r a c o nve r te r i s a n i s o l ated , fixed s witch ing fre qu en cy DC /DC c on ver ter th at us es
synchronous rectification and a patented topology to
a ch ieve extr emel y high e fficien cy a nd p owe r den s ity. Th is
mo du le is ide al ly s uite d to su p po rt wir el es s b a se sta tion
amplifie rs an d for applicatio ns to drive co ol ing fans us ed in
n et wor ki ng s ys t ems , s erv er s an d da t a s t or a ge un it s . Th e Ter a
s eri es co nver ter s o ffer in d us try l ead in g us ea bl e ou tp ut p ower
for a ny s ta n da r d “ fu ll -b r ick ” mo du l e. Th es e 28 Vou t mod ul es
a r e a v a i l a b l e i n o p e n f r a m e a n d b a s e p l a t e d v e r s i o n s . R oH S
compliant (see page 13 ).
Operational Features
• Ultra-high efficiency, 95% at full rated load current,
96% at half rated load current
• Delivers up to 728 Watts of output power with minimal
derating
• Input voltage range: 36V – 75V, with 100V for 100ms
input transient capability
• Fixed frequency switching provides predictable
EMI performance
• On-board input and output filtering
Mechanical Features
• Industry standard full-brick pin-out configuration
• Industry standard size: 4.6” x 2.4” (116.8 x 61.0mm)
• Total height only 0.50” (12.7mm), open frame unit only
0.43” (10.8mm)
• Total weight: 10.0oz. (284 grams), open frame unit
only 5.0 oz. (142 grams)
Safety Features
• 2250V, 30 MW input-to-output isolation
• UL/cUL 60950-1 recognized (US & Canada), basic
insulation rating
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Product # PQ60280FTA26
Phone 1-888-567-9596
www.synqor.com
PQ60280FTA26 Module
Pr otection Features
• Input under-voltage lockout disables converter at low
input voltage conditions
• Output current limit and short circuit protection protects
converter and load from damage
• Active back bias limit prevents damage to converter
from external load induced pre-bias
• Output over-voltage protection
• Thermal shutdown
Contr ol Features
• Fully isolated On/Off control (positive and negative
logic options are available)
• Remote sense for the output voltage compensates for
output distribution drops
• Output voltage trim permits custom voltages and voltage
margining
• Synchronization feature available (full feature only)
• Paralleling capability
Doc.# 005-2FT628P Rev. C
4/17/08
Page 1
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
2.40
(60.96)
MECHANICAL
DIAGRAM
(open frame)
1.750
(44.45)
4.60
1.400
(116.8)
(35.56)
1.150
(29.21)
4.20
0.900
(106.7)
(22.86)
0.500
(12.7)
0.20
0.45
0.250
(5.1)
(6.35)
(11.4)
0.050
(1.27)
1
2
3
4
Top View
18
17
16
5
15
14
6
1.250 (31.75)
13
7
0.850 (21.59)
8 9 10 11 12
0.150 (3.81)
0.300 (7.62)
0.450 (11.43)
3.150
0.300 (7.62)
(80.01)
0.450 (11.43)
0.150 (3.81)
0.600 (15.24)
0.750 (19.05)
Bottom side
Clearance
0.033 ±0.027
(0.84 ±0.68)
Side View
Overall Height
0.395 ±0.025
0.180
(4.57)
See Note 3
PIN DESIGNATIONS
NOTES
1) Pins 1-4, 7-12 are 0.040” (1.02mm) diameter, with
0.080” (2.03mm) diameter standoff shoulders.
2) Pins 5-6, 13-18 are 0.080” (2.03 mm) diameter with
0.125” (3.18mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
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.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 5 oz. (142 g) typical
8) Workmanship: Meets or exceeds current IPC-A-610 Class II
9) UL/TUV standards require a clearance greater than 0.04” (1.02mm)
between input and output for Basic insulation. This issue should be
considered if any copper traces are on the top side of the user’s
board. Note that the ferrite cores are considered part of the
input/primary circuit.
Pin Designations Notes:
1. Leave TRIM pin open for nominal output voltage.
2. SENSE(+) should be connected to Vout(+) either remotely or at the converter.
3. SENSE(–) should be connected to Vout(–) either remotely or at the converter.
Product # PQ60280FTA26
Phone 1-888-567-9596
(10.03 ±0.63)
Load Board
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
www.synqor.com
Name
SyncIn
SyncOut
+ON/OFF
– ON/OFF
Vin(+)
Vin(–)
Vaux
IOG
PARALLEL
TRIM
SENSE(+)
SENSE(–)
Vout(–)
Vout(–)
Vout(–)
Vout(+)
Vout(+)
Vout(+)
Function
Synchronization Input (full feature versions only)
Synchronization Output (full feature versions only)
Turn converter on and off, referenced to – ON/OFF
Fully isolated ground
Positive input voltage
Negative input voltage
Remote ON/OFF power, referenced to Vout(–)
Power Good or Inverted Operation Good
Current share
Output voltage trim1
Positive remote sense2
Negative remote sense3
Negative output voltage
Negative output voltage
Negative output voltage
Positive output voltage
Positive output voltage
Positive output voltage
Doc.# 005-2FT628P Rev. C
5/21/08
Page 2
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
1.750
MECHANICAL
DIAGRAM
(base-plated)
(44.45)
1.400
(35.56)
1.150
(29.21)
0.900
4.60
(22.86)
(116.8)
0.500
4.20
(12.7)
(106.7)
0.45
0.250
2.000
(6.35)
(50.8)
0.20
(11.4)
0.050
(5.1)
(1.27)
1
2
3
4
Top View
18
17
16
2.40
(60.96)
5
15
0.20
14
6
1.250 (31.75)
(5.1)
13
7
0.850 (21.59)
8 9 10 11 12
0.150 (3.81)
0.300 (7.62)
0.450 (11.43)
3.150
0.300 (7.62)
(80.01)
0.450 (11.43)
0.150 (3.81)
0.600 (15.24)
0.750 (19.05)
Bottom side
Clearance
0.061 +0.019 / -0.022
(1.55 +0.48 / -0.55)
Side View
M3 Non-Threaded or
Threaded Standoff
4 Places
(see Note 10 for
threaded version)
NOTES
1) Pins 1-4, 7-12 are 0.040” (1.02mm) diameter, with
0.080” (2.03mm) diameter standoff shoulders.
2) Pins 5-6, 13-18 are 0.080” (2.03 mm) diameter with
0.125” (3.18mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
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.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 10 oz. (284 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) UL/TUV standards require a clearance greater than 0.04” (1.02mm)
between input and output for Basic insulation. This issue should be
considered if any copper traces are on the top side of the user’s
board. Note that the ferrite cores are considered part of the
input/primary circuit.
10) Applied torque per screw should not exceed 3 in-lb (.33Nm)
Pin Designations Notes:
1. Leave TRIM pin open for nominal output voltage.
2. SENSE(+) should be connected to Vout(+) either remotely or at the converter.
3. SENSE(–) should be connected to Vout(–) either remotely or at the converter.
Product # PQ60280FTA26
Phone 1-888-567-9596
0.180
(4.57)
See Note 3
Load Board
Overall Height
0.492 +0.002 / -0.005
(12.5 +0.05 / -0.12)
PIN DESIGNATIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
www.synqor.com
Name
SyncIn
SyncOut
+ON/OFF
– ON/OFF
Vin(+)
Vin(–)
Vaux
IOG
PARALLEL
TRIM
SENSE(+)
SENSE(–)
Vout(–)
Vout(–)
Vout(–)
Vout(+)
Vout(+)
Vout(+)
Function
Synchronization Input (full feature versions only)
Synchronization Output (full feature versions only)
Turn converter on and off, referenced to – ON/OFF
Fully isolated ground
Positive input voltage
Negative input voltage
Remote ON/OFF power, referenced to Vout(–)
Power Good or Inverted Operation Good
Current share
Output voltage trim1
Positive remote sense2
Negative remote sense3
Negative output voltage
Negative output voltage
Negative output voltage
Positive output voltage
Positive output voltage
Positive output voltage
Doc.# 005-2FT628P Rev. C
5/21/08
Page 3
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
PQ60280FTA26 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units
100
80
100
2250
100
125
18
V
V
V
V
°C
°C
V
Notes & Conditions
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
Inrush Current Transient Rating
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (L\C)
Recommended External Input Capacitance
Recommended External Input Capacitor ESR1
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise1
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Back-Drive Current-Limit While Enabled
Back-Drive Current-Limit While Disabled
Current Share Accuracy (2 units paralleled)
Maximum Output Capacitance
-40
-55
-2
36
48
75
V
31.5
29.5
33.3
31.0
2.3
34.7
32.4
V
V
V
A
mA
mA
A 2s
mA
A
A
µH\µF
µF
220
42
3
0.04
27.75
27.50
0
28.0
1.50
0.14
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
For a Step Change in Output Current (5A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Startup Delay:
First Startup Delay:
Restart Inhibit Delay:
Output Voltage Overshoot
EFFICIENCY
100% Load
50% Load
25
22.0
250
65
0.1
60
30
0.2 \ 8.0
200
0.20
1.00
28.00
28.25
+0.05 \ 28 +0.10 \ 28
+0.1 \ 28 +0.2 \ 56
+45
+90
28.50
180
40
30.2
3.40
0.30
2.5
250
50
26
32.0
5.00
0.45
4,000
RMS thru 4.7µH inductor; Figures 11 & 13
RMS; Figures 11 & 12
Fast blow external fuse recommended
Internal values
Typical ESR 0.2W, see Figure 11
100kHz, -40ºC to 100ºC
V
%\mV
%\mV
mV
V
mV
mV
A
A
A
A
A
µF
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 11 & 14
Full Load; see Figures 11 & 14
Full Load; see Figures 11 & 14
Subject to thermal derating; Figures 5 - 6
Output Voltage 10% Low; Figure 22
Negative current drawn from output
Negative current drawn from output
28Vout at 26A Resistive Load
dB
120 Hz; Figure 18
1500
800
150
mV
mV
µs
50-75-50% Iout max; 47µF cap; Figure 9
50-75-50% Iout max; 47µF cap; Figure 10
To within 1% Vout nom
ms
ms
ms
ms
%
Full load, Vout=90% nom.; Figures 7 & 8
4,000 µF load capacitance, Iout = 26A resistive load
%
%
Figures 1 - 4 (Figure 21 for baseplated)
Figures 1 - 4 (Figure 21 for baseplated)
°C
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 6 for derating curve
Applies to baseplated units only
30
2
200
320
0
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Maximum Baseplate Temperature2
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance3
100% Load, 36 Vin
30
35
95
96
ISOLATION CHARACTERISTICS
W
Continuous
Continuous
100ms transient
Basic insulation level, Pollution degree 2
125
125
125
100
2250
30
3300
V
MW
pF
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 2: There is no derating with a baseplate temperature of 100ºC or lower.
Note 3: Higher values of isolation capacitance can be added external to the module.
Product # PQ60280FTA26
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2FT628P Rev. C
5/21/08
Page 4
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control (Option P)
On Current (threshold)
Off Current (threshold)
ON/OFF Control (Option N)
On Current (threshold)
Off Current (threshold)
Maximum allowable current through ON/OFF Pin
Auxiliary Power Supply Voltage
Auxiliary Power Supply Current
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
Min.
Typ.
Max.
Units
275
300
325
kHz
0.1
0.5
1
50
mA
µA
0.1
0.5
50
1
4
9.0
20.0
+15
+15
37
µA
mA
mA
V
mA
%
%
V
°C
°C
6.0
0.0
-50
33
35
120
10
833
2.13
1.93
TBD
Notes & Conditions
Regulation and isolation stages
Measured across Pins 9 & 5; Figure C
Measured across Pins 9 & 5
Over full temp range; % of nominal Vout
Average PCB Temperature
See App Note: Output Load Current Calc.
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
STANDARDS COMPLIANCE
Parameter P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950-1
EN60950-1
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
GR-1089-CORE
Telcordia (Bellcore) GR-513
File # E194341, Basic insulation & pollution degree 2
Certified by TUV
Test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
Section 7 - electrical safety, Section 9 - bonding/grounding
• An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety
certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
# Units
32
5
5
10
5
5
5
15 pins
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in z axis
-40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load
85°C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
MIL-STD-883, method 2003 and JESD22-B102D
• Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply
robust, reliable product. Contact the factory for official product family qualification documents.
OPTIONS
PATENTS
SynQor provides various options for this family of dc-dc converters. Please consult the last page for additional information.
SynQor is protected under various patents. Please consult the
last page for further details.
Product # PQ60280FTA26
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2FT628P Rev. C
5/21/08
Page 5
Input:
Output:
Current:
Package:
Technical Specification
100
36-75 V
28 V
26 A
Full-brick
100
98
98
96
96
Efficiency (%)
94
Efficiency (%)
94
92
90
92
90
88
86
88
86
36 Vin
48 Vin
84
25 ºC
40 ºC
75 Vin
82
55 ºC
80
84
0
3
5
8
10
13
16
18
21
23
100
26
200
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C.
400
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C
(nominal input voltage).
50
32
45
30
40
28
Power Dissipation (W)
Power Dissipation (W)
300
Air Flow (LFM)
35
30
25
20
15
36 Vin
10
48 Vin
5
75 Vin
0
26
24
22
20
18
25 ºC
40 ºC
16
55 ºC
14
0
3
5
8
10
13
16
18
21
23
26
100
Load Current (A)
200
300
400
Air Flow (LFM)
Figure 3: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25°C.
Figure 4: Power dissipation at nominal output voltage and 60% rated
power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and
55°C (nominal input voltage).
25
Iout (A)
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0
0
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
Ambient Air Temperature (ºC)
Figure 5: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from pin
1 to pin 2 (nominal input voltage). See Figure 21 for baseplate derating curve.
Product # PQ60280FTA26
Phone 1-888-567-9596
Figure 6: Thermal plot of converter at 14.7 amp load current (411.6W)
with 55°C air flowing at the rate of 200 LFM. Air is flowing from pin 1
to pin 2 (nominal input voltage).
www.synqor.com
Doc.# 005-2FT628P Rev. C
5/21/08
Page 6
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
Figure 7: Turn-on transient at full load (resistive load) (10 ms/div).
Input voltage pre-applied. Top Trace: Vout (10V/div). Bottom Trace:
ON/OFF input (10V/div)
Figure 8: Turn-on transient at zero load (10 ms/div). Top Trace: Vout
(10V/div). Bottom Trace: ON/OFF input (10V/div)
Figure 9: Output voltage response to step-change in load current (50%-75%-
Figure 10: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5A/µ s). Load cap: 47µ F, ceramic output capacitance.
Top trace: Vout (2V/div). Bottom trace: Iout (5A/div).
50% of Iout(max); dI/dt = 0.1A/µ s). Load cap: 47µ F, ceramic output capacitance.
Top trace: Vout (1V/div). Bottom trace: Iout (5A/div).
See Fig. 13
4.7 µH
source
impedance
See Fig. 12
iS
VSOURCE
Vin
See Fig. 14
iC
200 µF,
electrolytic
capacitor
DC/DC
Converter
VOUT
15 µF,
2*6.8 µF
ceramic tantalum and
capacitor
1µF ceramic
capacitor
Figure 11: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 12), Input Reflected Ripple Current
(Figure 13) and Output Voltage Ripple (Figure 14).
Product # PQ60280FTA26
Phone 1-888-567-9596
Iin
Figure 12: Input Terminal Ripple Current, ic, at full rated output current and 75V input voltage with 4.7µ H source impedance and 200µ F
electrolytic capacitor (Ch2 5A/div). (See Figure 11).
www.synqor.com
Doc.# 005-2FT628P Rev. C
5/21/08
Page 7
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
0A
13A
26A
Figure 13: Input reflected ripple current, is, through a 4.7 µ H source
inductor at 75V input voltage and rated load current (50 mA/div). (See
Figure 11).
Figure 14: Output voltage ripple at nominal input voltage and rated load
current (200 mV/div). Load capacitance: two 6.8µ F ceramic capacitors
and 15µ F tantalum capacitor. Bandwidth: 20 MHz. (See Figure 11).
Figure 15: Output voltage response to step-change in input voltage
(1000V/ms). Load cap: no output capacitance. Ch 1: Vout (2V/div), Ch 2: Vin
(20V/div).
Figure 16: Load current (20A/div) as a function of time when the converter attempts to turn on into a 1 mW short circuit.
10
0
1
Forward Transmission (dB)
Output Impedance (ohms)
10
0.1
0.01
35 Vin
48 Vin
0.001
-10
-20
-30
35 Vin
48 Vin
-40
75 Vin
75 Vin
-50
0.0001
100
1,000
Hz
10,000
Figure 17: Magnitude of incremental output impedance (Zout =
vout/iout) for minimum, nominal, and maximum input voltage at full
rated power.
Product # PQ60280FTA26
Phone 1-888-567-9596
100
100,000
1,000
10,000
100,000
Hz
Figure 18: Magnitude of incremental forward transmission (FT =
vout/vin) for minimum, nominal, and maximum input voltage at full
rated power.
www.synqor.com
Doc.# 005-2FT628P Rev. C
5/21/08
Page 8
Input:
Output:
Current:
Package:
Technical Specification
15
36-75 V
28 V
26 A
Full-brick
100
5
Input Impedance (ohms)
Reverse Transmission (dB)
10
0
-5
-10
-15
35 Vin
48 Vin
-20
10
1
35 Vin
48 Vin
75 Vin
75 Vin
-25
0.1
10
100
1,000
10,000
100,000
10
100
1,000
Hz
10,000
100,000
Hz
Figure 19: Magnitude of incremental reverse transmission (RT =
iin/iout) for minimum, nominal, and maximum input voltage at full rated
power.
Figure 20: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input voltage at full rated power.
27
35
24
30
Output Voltage (V)
21
Iout (A)
18
15
12
9
400 LFM (2.0 m/s)
6
25
20
15
10
300 LFM (1.5 m/s)
5
200 LFM (1.0 m/s)
3
100 LFM (0.5 m/s)
0
0
0
25
40
55
70
85
-5
Ambient Air Temperature (ºC)
0
5
10
15
20
25
30
35
Load Current (A)
Figure 21: Baseplated unit maximum output power derating curves vs. ambient
air temperature for airflow rates of 100 LFM through 400 LFM with air flowing
from input to output (nominal input voltage). No derating if baseplate is <100ºC.
Figure 22: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
3.5
3.0
Rth (C/W)
2.5
2.0
1.5
1.0
0.5
0.0
0
100
200
300
400
Airflow (LFM)
Figure 23: Thermal resistance (Rthca) plot at 50% output power (baseplated, no-heatsink configuration).
Product # PQ60280FTA26
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Doc.# 005-2FT628P Rev. C
5/21/08
Page 9
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The PowerQor series converter 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 step-down to achieve the low output voltage
required.
REMOTE ON/OFF (Pin 3): The (+)ON/OFF input, Pin 3, permits the user to control when the converter is on or off. This input
is referenced (-)ON/OFF. There are two versions of the converter
that differ by the sense of the logic used for the ON/OFF input.
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 PowerQor converter has such high efficiency, even at very low output voltages and very high output currents.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not required,
the PowerQor series of converters do not need a metal baseplate
or potting material to help conduct the dissipated energy to the
heatsink. The PowerQor series of converters can thus be built
more simply and reliably using high yield surface mount techniques on a PCB substrate.
The PowerQor series converters use the industry standard footprint and pin-out configuration.
VIN (+)
I ON/OFF
+ON/OFF
-ON/OFF
VOUT (+)
SENSE (+)
SENSE (-)
VOUT (-)
VIN (-)
Figure A: Typical circuit for driving the ON/OFF pin.
VIN (+)
I ON/OFF
+ON/OFF
-ON/OFF
In the positive logic version, the ON/OFF input is active high
(meaning that a high ION/OFF turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning
that a low ION/OFF turns the converter on). Figures A & B detail
two possible circuits for driving the ON/OFF pin.
REMOTE SENSE(+) (Pins 11 and 12): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 11 should be connected to Vout(+) and Pin 12 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
Pins 11 and 12 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 16 and 13) to determine when it should
trigger, not the voltage across the converter’s sense leads (pins 11
and 12). 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 10): 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 10 and Pin 12 (SENSE(-) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be
Rtrim-down =
VOUT (+)
SENSE (+)
SENSE (-)
(732
) - 8.94
D
(kW)
where
VOUT (-)
VIN (-)
D% =
Vnominal – Vdesired
Vnominal
x 100%
Figure B: Another circuit for driving the ON/OFF pin.
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5/21/08
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Input:
Output:
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Package:
Technical Specification
To increase the output voltage, the user should connect a resistor
between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase
of the nominal output voltage, the value of the resistor should be
Rtrim-up =
16000 + 158.4 x (VDES - VNOM)
VDES - VNOM
(kW)
Figure C graphs 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.
1,000,000
SYNCHRONIZATION: The converter’s switching frequency
can be synchronized to an external frequency source that is in the
270 kHz to 330 kHz range. A pulse train at the desired frequency should be applied to the SYNC IN pin (pin 1) with
respect to the INPUT RETURN (pin 6). Its frequency can be anywhere in that range, regardless of the natural frequency of the
power converter. This pulse train should have a duty cycle in the
20% to 80% range. Its low value should be below 0.8V to be
guaranteed to be interpreted as a logic low, and its high value
should be above 2.0V to be guaranteed to be interpreted as a
logic high. The transition time between the two states should be
less than 300ns.
If the converter is not to be synchronized, the SYNC IN pin
should be left open circuit. The converter will then operate in its
free-running mode at a frequency of approximately 300 kHz.
100,000
Trim Resistance (kOhms)
36-75 V
28 V
26 A
Full-brick
10,000
The converter also has a SYNC OUT pin (pin 2). The pulse train
coming out of SYNC OUT has a frequency that matches the
switching frequency of the converter with which it is associated.
This frequency is either the free-running frequency if there is no
synchronization signal at the SYNC IN pin, or the synchronization frequency if there is.
1,000
100
10
1
0
5
10
15
20
25
% Increase in Vout
30
35
40
45
50
% Decrease in Vout
Figure C: Trim Graph for 28Vout module
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 bypassed 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.
Current Share (pin 9): The active current share feature allows
for N+1 and parallel applications. To achieve load sharing,
directly connect the I share pins of multiple units. The load current
will share equally among the multiple units. It is important that
the Vin(-) pins of the sharing units be directly connected and NOT
placed outside of an EMI filter or other impedance path. The voltage at the I Share pin will range from 1 to 2.4 volts (at full rated
current), referenced to the primary-side ground, Vin(-)
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5/21/08
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Input:
Output:
Current:
Package:
Technical Specification
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to
turn off when the input voltage is too low, helping avoid an input
system instability problem, described in more detail in the application note titled “Input System Instability”. The lockout circuitry
is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical “Turn-On Voltage Threshold”
value* 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: If the output current exceeds the
"Output DC Current Limit Inception" point*, then a fast linear current limit controller will reduce the output voltage to maintain a
constant output current. There is no minimum operating output
voltage. The converter will run with low on-board power dissipation down to zero output voltage. A redundant circuit will shutdown the converter if the primary current limit fails.
36-75 V
28 V
26 A
Full-brick
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.
Start-up Inhibit Period: If any protection feature causes the
converter to shut down, the converter will attempt to restart after
320ms (typical), the "Restart Inhibit Period".* On initial application of input voltage, the first startup delay is about 200ms
from input voltage valid to unit output rising. With the on/off pin
set to enable the converter, the "Turn-On Time"* will increase by
only 2ms.
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. The
full I-V output characteristic can be seen in Figure 19.
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.
* See specifications page for details.
Product # PQ60280FTA26
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Input:
Output:
Current:
Package:
Technical Specification
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 D below provides a typical circuit diagram which details the input filtering and voltage trimming.
Input Filtering and External Input Capacitance: 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. More detailed information is available in the application note titled “EMI
Characteristics” on the SynQor website.
36-75 V
28 V
26 A
Full-brick
Output Filtering and External Output Capacitance:
Figure E below shows the internal output filter components. This
filter dramatically reduces output voltage ripple. However, some
minimum external output capacitance is required, as specified in
the Output Characteristics section on the Electrical Specifications
page. No damage will occur without this capacitor connected,
but peak output voltage ripple will be much higher.
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 available as
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]
2 x 4.7µF
local ceramic
Vin(+)
Electrolytic
Capacitor
Vin
External
Input
Filter
Vout(+)
Vsense(+)
100µF
ESR @ 0.2W
ON/OFF
Trim
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Product # PQ60280FTA26
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Doc.# 005-2FT628P Rev. C
5/21/08
Page 13
Input:
Output:
Current:
Package:
Technical Specification
36-75 V
28 V
26 A
Full-brick
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s PowerQor DC/DC
converters follows the format shown in the example below.
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant.
PQ 60 280 F T A 26 N N S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Thermal Design
Model Number
Input Voltage
PQ60280FTw 26xyz -G
36 - 75 V
Output Max Output
Voltage
Current
28.0 V
26 A
Performance Level
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Package Size
Output Voltage
Input Voltage
Options Description: w x y z
Thermal
Design
Enable
Logic
A - Open Frame
B - Threaded Baseplate
F - Non-Threaded Baseplate
P - Positive
N - Negative
Product Family
The first 12 characters comprise the base part number and the
last 3 characters indicate available options. Although there
are no default values for enable logic and pin length, the most
common options are negative logic and 0.145” pins. These
part numbers are more likely to be readily available in stock
for evaluation and prototype quantities. A “-G” suffix indicates the product is 6/6 RoHS compliant.
Pin
Length
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
Feature
Set
S - Standard
F - Full Feature
PATENTS
SynQor holds the following patents, one or more of which
might apply to this product:
5,999,417
6,594,159
6,927,987
7,119,524
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
6,222,742
6,731,520
7,050,309
7,269,034
6,545,890
6,894,468
7,072,190
7,272,021
6,577,109
6,896,526
7,085,146
7,272,023
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ60280FTA26
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
www.synqor.com
Doc.# 005-2FT628P Rev. C
5/21/08
Page 14