50A/250W

Technical
Specification
PQ50050HPB50
48V
5.0V
50A
2000V dc
Half-brick
Input
Output
Current
Isolation
DC-DC Converter
The PQ50050HPB50 PowerQor Peta halfbrick converter is a next-generation, boardmountable, isolated, fixed switching frequency
DC/DC converter that uses synchronous
rectification to achieve extremely high
conversion efficiency.The Peta series converters
offer industry leading output current for a
standard half-brick module. RoHS compliant (see
last page).
Operational Features
•
•
•
•
Protection Features
Ultra-high efficiency, 92% at full rated load
Delivers up to 250W of output power with minimal derating
Operating input voltage range: 44-52V
Fixed frequency switching provides predictable EMI performance
• Input under-voltage lockout disables converter at low input
voltage conditions
• Output current limit and short circuit protection
• Active back bias limit prevents damage to converter from external load
induced pre-bias
• Output over-voltage protection
• Thermal shutdown
Control Features
Mechanical Features
•
•
•
•
• On/Off control referenced to input side
(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
• Output voltage trim range of -20%, +10%
Industry standard pin-out configuration
Size: 2.3” x 2.4” (58.4 x 61.0mm)
Total height only 0.50” (12.7mm)
Total weight: 4.3oz. (123 grams)
Safety Features
Contents
Pending
• 2000V, 30MΩ input-to-output isolation
• UL 60950-1 recognized (US & Canada), basic insulation rating
• TUV certified to EN60950-1
• Meets UL94V-0 flammability requirements
Product # PQ50050HPB50
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Page No.
MECHANICAL DIAGRAM (base-plated). . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standards and Qualifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Doc.# 005-0005487 Rev. A
03/18/10
Page 1
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
Baseplate Mechanical Diagram
PIN DESIGNATIONS
NOTES
1)
2)
3)
4)
5)
6)
7)
8)
9)
Applied torque per screw should not exceed 3IN-LB (0.33Nm).
Pin
Name
Function
Baseplate flatness tolerance is 0.004” (.10mm) TIR for surface
1
Vin(+)
Positive input voltage
Pins 1, 2, 4, 6-8 are 0.040” (1.02mm) diameter, with 0.080” (2.03mm)
diameter standoff shoulders.
TTL input to turn converter on and off,
2
ON/OFF
Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125” (3.18mm)
referenced to Vin(–), with internal pull up.
diameter standoff shoulders.
4
Vin(–)
Negative input voltage
Other pin extension lengths available.
5
Vout(-)
Negative
output voltage
All Pins: Material: Copper Alloy
6
SENSE(–)
Negative remote sense(see note 1)
Finish: Matte Tin over Nickel plate
7
TRIM
Output voltage trim (see note 2)
Undimensioned components are shown for visual reference only.
8
SENSE(+)
Positive remote sense (see note 3)
Weight: 4.3oz (123g) for baseplated unit
9
Vout(+)
Positive output voltage
All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
Notes:
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
SENSE(–) should be connected to Vout(–) either remotely or at
1)
the converter.
2)
Leave TRIM pin open for nominal output voltage.
SENSE(+) should be connected to Vout(+) either remotely or
3)
at the converter.
Product # PQ50050HPB50
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Doc.# 005-0005487 Rev. A
03/18/10
Page 2
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
PQ50050HPB50 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +70 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
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
Input Over-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
Response to Input Transient
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (C1\L\C2)
Recommended External Input Capacitance
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 Ceramic
EFFICIENCY
100% Load
50% Load
Product # PQ50050HPB50
Typ.
-40
-55
-2
Max.
Units Notes & Conditions
100
52
V
V
2000
100
125
18
V dc
°C
°C
V
44
48
52
V
31.5
29.5
2.2
33.3
31
2.3
34.4
32.4
2.4
V
V
V
58.2
56.6
1.5
59.7
58.1
1.6
61.3
59.2
1.8
6.0
120
5
0.04
100
2
350.0
5
200
20
1\3\6.4
47
4.95
5.00
±0.05 \ 3
±0.1 \ 5
±15
4.85
30
5
0
53.7
1.5
0
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57.9
3.5
2.5
20
5.05
Continuous
Continuous
Basic insulation level, Pollution degree 2
Baseplate temperature
V
V
V
A
100% Load, 44 Vin
mA
mA
A
mV
1000V/ms input transient
mA
RMS thru 10μH inductor; Figs. 11 & 13
mA
RMS: Figs. 11 & 12
A
fast blow external fuse recommended
µF\µH\µF internal values, see Figure E
µF
Typical ESR 0.1-0.2 Ω, See Figure 11
V
Factory pre-set with Sense(+), Sense(-) open
±0.1 \ 5 % \ mV
+0.2 \ 10 % \ mV
±30
mV
5.15
V
Over sample, line, load, temperature & life
20 MHz bandwidth; Figs. 11 & 14
60
mV
Full load, see Figures 11 & 14
mV
10
Full load, see Figures 11 & 14
50
A
Subject to thermal derating; Fig. 5
62.1
A
Output voltage 10% Low; Fig. 6
V
3.8
A
Negative current drawn from output
50
mA
Negative current drawn from output
34,000
µF
5Vout at 50A (Resistive Load)
92
93
www.synqor.com
%
%
Figures 1-4
Figures 1-4
Doc.# 005-0005487 Rev. A
03/18/10
Page 3
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
PQ50050HPB50 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +70 °C baseplate temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
60
dB
120 Hz; fig. 17
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
200
mV
50% to 75% to 50% Iout max; figure 9
Step Change in Output Current (5 A/µs)
300
mV
50% to 75% to 50% Iout max; figure 10
Settling Time
100
µs
To within 1% Vout nom
Turn-On Transient
Turn-On Time
22
30
ms
Full load, Vout=90% nom.; Figs. 7 & 8
Start-Up Inhibit Time
180
200
240
ms
-40oC to +125oC; Figure A
Output Voltage Overshoot
0
%
10,000 µF load capacitance, Iout = 0A
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
2000
V
See Absolute Maximum Ratings
Isolation Resistance
30
MΩ
Isolation Capacitance (input to output)
3300
pF
See Note 2
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
°C
Package rated to 150 °C
Board Temperature
125
°C
UL rated max operating temp 130 °C
Transformer Temperature
125
°C
Maximum Baseplate Temperature
100
°C
Applies to baseplated units only
FEATURE CHARACTERISTICS
Switching Frequency
198
220
242
kHz
Regulation and isolation stages
ON/OFF Control (Option P)
Off-State Voltage
-2
0.8
V
On-State voltage
2.7
18
V
ON/OFF Control (Option N)
Off-State Voltage
2.7
18
V
On-State voltage
-2
0.8
V
ON/OFF Control (either Option)
Figures A, B
Pull-Up Voltage
Vin/6
15
V
Pull-Up Resistance
42
kΩ
Output Voltage Trim Range
-20
+10
%
Measured across Pins 9 & 5; Figure C
Output Voltage Remote Sense Range
+10
%
Measured across Pins 9 & 5
Output Over-Voltage Protection
115
120
125
%
Over full temp range; % of nominal Vout
Over-Temperature Shutdown OTP Trip Point
120
°C
Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis
10
°C
Load Current Scale Factor
1200
See App Note: Output Load Current Calc.
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
2.13
106 Hrs. 75% load, 300LFM, 40 °C Ta
Calculated MTBF (MIL-217) MIL-HDBK-217F
1.3
106 Hrs. 75% load, 300LFM, 40 °C Ta
Field Demonstrated MTBF
106 Hrs. See our website for details
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor application support e-mail: [email protected]
Note 2: Higher values of isolation capacitance can be added external to the module.
Product # PQ50050HPB50
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Doc.# 005-0005487 Rev. A
03/18/10
Page 4
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
Standards and Qualifications
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
Pending
UL 60950-1:2003
Basic Insulation
CAN/CSA-C22.2 No. 60950-1:2003
EN60950-1:2001
Needle Flame Test (IEC 695-2-2)
Test on entire assembly; board & plastic components UL94V-0 compliant
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.
Parameter
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # PQ50050HPB50
# Units Test Conditions
32
5
5
10
5
5
5
15 pins
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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 and y axis, 1 drop in z axis
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
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Doc.# 005-0005487 Rev. A
03/18/10
Page 5
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
95
94
90
93
Efficiency (%)
95
Efficiency (%)
100
85
80
92
91
25º C
44 Vin
40º C
90
48 Vin
75
55º C
52 Vin
89
70
0
5
10
15
20
25
30
Load Current (A)
35
40
45
0
50
200
300
Air Flow (LFM)
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).
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
24
14
22
20
13
18
Power Dissipation (W)
Power Dissipation (W)
100
16
14
12
10
8
6
44 Vin
4
11
10
25º C
40º C
9
48 Vin
2
12
55º C
52 Vin
8
0
0
5
10
15
20
25
30
Load Current (A)
35
40
45
0
50
Figure 3: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
100
200
300
Air Flow (LFM)
400
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).
7
50
6
Output Voltage (V)
Iout (A)
40
30
20
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0.0 m/s)
10
5
4
3
2
44 Vin
48 Vin
1
52 Vin
0
0
25
40
55
70
0
85
0
Ambient Air Temperature (oC)
Figure 5: Maximum output power derating curves (no heatsink) vs. ambient air
temperature for airflow rates of 0 LFM through 400 LFM with air flowing from
input to output (nominal input voltage).
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5
10
15
20
25
30
35
Load Current (A)
40
45
50
55
60
Figure 6: Output voltage vs. load current showing typical current limit curves
and converter shutdown points.
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Doc.# 005-0005487 Rev. A
03/18/10
Page 6
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
Figure 7: Turn-on transient at full load (resistive load) (10 ms/div). Input voltage
pre-applied. Top Trace: Vout (2V/div). Bottom Trace: ON/OFF input (5V/div)
Figure 8: Turn-on transient at zero load (10 ms/div). Top Trace: Vout (2V/div).
Bottom Trace: 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: 15µF, 450mΩ ESR tantalum cap
and 1µF ceramic cap. Top trace: Vout (200mv/div), Bottom Trace:Iout (20A/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, 15mΩ ESR tantalum cap
and 1µF ceramic cap. Top trace: Vout (200mv/div), Bottom Trace:Iout (20A/div).
Input
Reflected
Ripple
Current
10µH
source
impedance
Input
Terminal
Ripple
Current
iS
VSOURCE
iC
47 µF,
<1Ω ESR
electrolytic
capacitor
Output
Voltage
Ripple
DC-DC
Converter
VOUT
1 µF
15 µF,
ceramic 450m Ω ESR
capacitor
tantalum
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).
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Figure 12: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 10µH source impedance and 47µF electrolytic
capacitor (200mA/div). (See Figure 11).
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Doc.# 005-0005487 Rev. A
03/18/10
Page 7
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
Figure 13: Input reflected ripple current, is, through a 10 µH source inductor at
nominal input voltage and rated load current (5 mA/div). (See Figure 11).
Figure 14: Output voltage ripple at nominal input voltage and rated load current
(10 mV/div). Load capacitance: two 1µF ceramic capacitors and 15µF tantalum
capacitor. Bandwidth: 20 MHz. (See Figure 11).
Figure 15: Load current (20A/div) as a function of time when the converter
attempts to turn on into a 1 mΩ short circuit. Top trace (2.5ms/div) is an
expansion of the on-time portion of the bottom trace.
Product # PQ50050HPB50
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Doc.# 005-0005487 Rev. A
03/18/10
Page 8
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
0
0.1
0.01
0.001
44 Vin
48 Vin
52 Vin
Forward Transmission (dB)
Output Impedance (ohms)
-10
-20
-30
-40
-50
-60
-70
44 Vin
48 Vin
52 Vin
-80
-90
0.0001
-100
10
100
1,000
Hz
10,000
100,000
Figure 16: Magnitude of incremental output impedance (Zout = vout/iout) for
minimum, nominal, and maximum input voltage at full rated power.
10
100
1,000
Hz
10,000
100,000
Figure 17: Magnitude of incremental forward transmission (FT = vout/vin) for
minimum, nominal, and maximum input voltage at full rated power.
100
0
Input Impedance (ohms)
Reverse Transmission (dB)
-10
-20
-30
-40
44 Vin
48 Vin
52 Vin
-50
10
1
44 Vin
48 Vin
52 Vin
0.1
-60
10
100
1,000
10,000
Hz
Figure 18: Magnitude of incremental reverse transmission (RT = iin/iout) for
minimum, nominal, and maximum input voltage at full rated power.
Product # PQ50050HPB50
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10
100,000
100
1,000
10,000
100,000
Hz
Figure 19: Magnitude of incremental input impedance (Zin = vin/iin) for
minimum, nominal, and maximum input voltage at full rated power.
www.synqor.com
Doc.# 005-0005487 Rev. A
03/18/10
Page 9
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The Power
PowerQor series converter 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-down 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(-). 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 Power
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 converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink.
The PowerQor converter can thus be built more simply and reliably
using high yield surface mount techniques on a PCB substrate.
The PowerQor series of half-brick, quarter-brick and eighthbrick converters uses the industry standard footprint and
pin-out configuration.
ON/OFF
Vin(_)
Vin(_)
Remote Enable Circuit
ON/OFF
ON/OFF
Negative Logic
(Permanently
Enabled)
5V
ON/OFF
Vin(_)
Positive Logic
(Permanently
Enabled)
TTL/
CMOS
REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 8 should be connected to Vout(+) and Pin 6 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 8 and 6 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 9 and 5) to determine when it should trigger, not the voltage across the converter’s sense leads (pins 8 and
6). Therefore, the resistive drop on the board should be small
enough so that output OVP does not trigger, even during load
transients.
5V
Vin(+)
274k
Vin(_)
Vin(_)
Open Collector Enable Circuit
ON/OFF
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter on). In the negative logic
version, the ON/OFF signal is active low (meaning that a low
turns the converter on). Figure A details five possible circuits for
driving the ON/OFF pin. Figure B is a detailed look of the internal
ON/OFF circuitry.
ON/OFF
50k
TTL
Direct Logic Drive
100pF
50k
Figure A: Various circuits for driving the ON/OFF pin.
Vin(_)
Figure B: Internal ON/OFF pin circuitry
Product # PQ50050HPB50
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Doc.# 005-0005487 Rev. A
03/18/10
Page 10
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
OUTPUT VOLTAGE TRIM (Pin 7): 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 7 and Pin
6 (SENSE(-) input). For a desired decrease of the nominal output
voltage, the value of the resistor should be
Rtrim-down =
-2
(100%
D )
(kW)
where
D% =
Vnominal – Vdesired
Vnominal
x 100%
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
nominal – 2
(V1.225
)xV
Rtrim-up =
DES
+ VNOM
(kW)
VDES - VNOM
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.
Trim
Resistance
(kOhms)
Trim
Resistance(kOhms)
100,000
10,000
10,000
1,000
100
100
1010
1
0
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” on the SynQor website.
The lockout circuitry is a comparator with DC hysteresis. When the
input voltage is rising, it must exceed the typical Turn-On Voltage
Threshold value (listed on the specification page) before the converter will turn on. Once the converter is on, the input voltage must
fall below the typical Turn-Off Voltage Threshold value before the
converter will turn off.
Input Over-Voltage Shutdown: Available on PQ48 models
only. The converter turns off when the input voltage is too high,
allowing the converter to withstand an input voltage as high as
100V without destruction. The shutdown circuitry is a comparator
with DC hysteresis. When the input voltage exceeds the typical
Input Over-Voltage Shutdown value, the converter will turn off.
Once the converter is off, it will turn back on when the input voltage
falls below the minimum Input Over-Voltage Shutdown value.
Output Current Limit: The maximum current limit remains constant as the output voltage drops. However, once the impedance
of the short across the output is small enough to make the output
voltage drop below the specified Output DC Current-Limit 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.
1,000
1
PROTECTION FEATURES
0
2
2
4
4
6
8
10
6
8
10
% increase Vout
% increase Vout
12
14
16
12
14
16
% decrease Vout
% decrease Vout
18
18
20
20
Figure C: Trim Graph
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.
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 Over-Temperature
Shutdown value. It will allow the converter to turn on again when
the temperature of the sensed location falls by the amount of the
Over-Temperature Shutdown Restart Hysteresis value.
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.
Product # PQ50050HPB50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005487 Rev. A
03/18/10
Page 11
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
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 Capacitance: Figure E below
provides a diagram showing 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.
Vout(+)
Vin(+)
Vin
Electrolytic
Capacitor
External
Input
Filter
Vsense(+)
Trim
ON/OFF
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+)
C2
C1
Vin(_)
Figure E: Internal Input Filter Diagram (component values listed on page 3).
Product # PQ50050HPB50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005487 Rev. A
03/18/10
Page 12
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200ms when it is
shut down for any reason. When an output short is present, this
generates a 5Hz “hiccup mode,” which prevents the converter from
overheating. In all, there are seven ways that the converter can be
shut down, initiating a Startup Inhibit Period:
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-brick)
• Output Over-Voltage Protection
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
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.
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.
• Over Temperature Shutdown
• Current Limit
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical TurnOn Time.
• Short Circuit Protection
• Turned off by the ON/OFF input
Vin
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(Positive
logic)
ON
OFF ON
OFF
ON
25 ms
200ms
Vout
(typical turn on time)
(typical turn
start-up inhibit
period time)
t1
t0
200ms
200ms
t2
t
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ50050HPB50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005487 Rev. A
03/18/10
Page 13
Input:44-52V
Output:5.0V
Current:50A
Part No.:PQ50050HPB50
Technical Specification
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s dc-dc converters
follows the format shown in the example below.
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
PQ
50 050 H P B 50 N N S - G
6/6 RoHS
Options (see
Ordering Information)
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
PQ50050HPB50NNS
44-52V
5.0V
50A
Output Current
Thermal Design
Performance Level
Options
Description:
z
The following options
must
be includedwinx yplace
of the w x y z
Package Size
Output Voltage
Thermal Design
Enable Logic
B - Baseplated
N - Negative
Pin Style
Feature Set
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
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]
N - 0.145"
S - Standard
Not all combinations make valid part numbers, please contact
SynQor for availability. See the Product Summary web page for
more options. Many operational functions of this converter are
programmable. Contact the factory regarding customizing.
PATENTS
SynQor holds the following U.S. patents, one or more of which
apply to each product listed in this document. Additional patent
applications may be pending or filed in the future.
5,999,417
6,731,520
7,072,190
7,272,023
6,222,742
6,894,468
7,085,146
7,558,083
6,545,890 6,577,109 6,594,159
6,896,526 6,927,987 7,050,309
7,119,524 7,269,034 7,272,021
7,564,702
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ50050HPB50
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.# 005-0005487 Rev. A
03/18/10
Page 14
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