55A/660W

Technical
Specification
PQ50120HZB55
48V
12V
55A
2250V dc
Half-brick
Input
Output
Current
Isolation
DC-DC Converter
The PQ50120HZx50 PowerQor Zeta half-brick converter
is a next-generation, board-mountable, isolated, fixed
switching frequency DC/DC converter. The Zeta series
offers industry leading power density for standard
isolated DC/DC converters with a tightly regulated
output. This 12V module provides 2,250Vdc isolation
and more available power and higher efficiency than
most competitive bus converters. RoHS Compliant
(see last page).
Operational Features
PQ50120HZB55
• High efficiency, 94% at full rated load current
Protection Features
• Delivers up to 55A of output current (660W)
•
•
•
•
Input voltage range: 44-52V
Fixed frequency switching provides predictable EMI performance
No minimum load requirement means no preload resistors required
Wide output voltage trim range (-50%, +10%), see trim section
Mechanical Features
• Input under-voltage lockout disables converter at low input
voltage conditions
• Output current limit and short circuit protection protects converter and
load from permanent damage and consequent hazardous conditions
• Active back bias limit provides smooth startup with external load
induced pre-bias
• Latching output over-voltage protection protects load from
damaging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
• Industry standard half-brick pin-out configuration
• Industry standard size: 2.390" x 2.490" x 0.512"
(60.6 x 63.1 x 13.0mm)
• Height only 0.50” (12.7mm)
Control Features
• On/Off control referenced to input side
(positive and negative logic options are available)
• Weight: 4.3oz (123g)
Contents
Page No.
Safety Features
•
•
•
•
•
2250V, 30MΩ input-to-output isolation
UL 60950-1:2003 Basic Insulation
CAN/CSA-C22.2 No. 60950-1:2003
EN60950-1:2001
RoHS compliant (see last page)
Product # PQ50120HZx55
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MECHANICAL DIAGRAM (base-plated) . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Standards and Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 1
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
MECHANICAL DIAGRAM (base-plated)
2.40 [61 ]
2.00 [50.8]
1.400 [35.56]
1.000 [25.4]
.700 [17.78]
.400 [10.16]
.145 [3.687]
SEE NOTE 6
.02 [5.1]
9
8
7
6
.495 ±.024
[12.57±0.6]
OVERALL HEIGHT
5
2.30
[58.4]
1.90
[48.3]
SIDE VIEW
TOP VIEW
1.90
[48.3]
.19
[4.8 ]
1
2
3
4
.50 [12.7]
.400[10.16]
1.00 [25.4]
1.400 [35.56]
M3 THREADED INSERT
4 PLACES
SEE NOTE 1
NOTES
1)
2)
3)
4)
5)
6)
7)
8)
M3 screws used to bolt unit’s baseplate to other surfaces (such as
heatsink) must not exceed 0.100” (2.54 mm) depth below the surface
of the baseplate.
Applied torque per screw should not exceed 6in-lb. (0.7 Nm)
Baseplate flatness tolerance is 0.004” (.10mm) TIR for surface
Pins 1-4, 6-8 are 0.040” (1.02mm) diameter, with 0.080” (2.03mm)
diameter standoff shoulders.
Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125” (3.18mm)
diameter standoff shoulders.
Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
All Pins: Material: Copper Alloy
Finish (RoHS 6/6): Matte Tin over Nickel plate
Undimensioned components are shown for visual reference only.
9) Weight: 4.3oz (123g)
10) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x
+/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm)
11) Workmanship: Meets or exceeds IPC-A-610C Class II
12) The flanged pins are designed to permit surface mount soldering
(allowing to avoid the wave soldering process) through the use of the
flanged pin-in-paste technique.
.044 ±0.27
[1.12±0.68]
BOTTOMSIDE
CLEARANCE
PIN DESIGNATIONS
Pin
Name
1
Vin(+)
Function
Positive input voltage
2
ON/OFF
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
3
Reserved
Not connected
4
Vin(–)
5
Vout(–)
6
SENSE(–)
7
TRIM
8
SENSE(+)
9
Vout(+)
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.
Product # PQ50120HZx55
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Doc.# 005-0005483 Rev. 1
03/31/10
Page 2
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
PQ50120HZB55 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
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
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Recommended External Input Capacitance
Input Filter Component Values (L\C)
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 # PQ50120HZx55
Typ.
-40
-55
-2
Max.
Units Notes & Conditions
100
60
V
V
2250
100
125
18
V
°C
°C
V
44
48
52
V
31.5
29.0
1.5
33.0
30.5
2.5
34.5
32.0
3.5
21.0
200
40
20
V
V
V
A
mA
mA
mA
mA
A
µF
µH\µF
125
20
5
220
30
220
0.75\11
11.72
12.00
±1.0\120
±1.0\120
±90
11.60
90
20
0
60.0
15
0
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65.0
5.0
20
3
12.28
V
±240
12.40
%\mV
%\mV
mV
V
150
30
55
70.0
25
4
12
94
95
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Continuous
Continuous
In Current Limit, Vin min, trimmed up 10%
RMS thru 4.7μH inductor
RMS
Fast acting external fuse recommended
Typical ESR 0.1-0.2Ω; Figure 13
Internal values
See note 1
See note 1
mV
mV
A
A
V
A
mA
mF
Over sample, line, load, temperature & life
20MHz 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.# 005-0005483 Rev. 1
03/31/10
Page 3
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
PQ50120HZB55 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.
Max.
Units Notes & Conditions
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
Step Change in Output Current (0.1A/µs)
350
mV
50% to 75% to 50% Iout max, 470 μF load cap
Step Change in Output Current (5A/µs)
500
mV
Settling time
1
ms
To within 1% Vout nom
Turn-On Transient
Turn-On Time
29
ms
Full load, Vout=90% nom; Figures 5 & 6
Output Voltage Overshoot
2
%
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
2250
V
See Absolute Maximum Ratings
Isolation Resistance
30
MΩ
Isolation Capacitance (input to output)
1000
pF
See Note 4
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
FEATURE CHARACTERISTICS
Switching Frequency Regulation Stage
230
240
250
kHz
Switching Frequency Isolation Stage
115
120
125
kHz
ON/OFF Control (Option P)
Off-State Voltage
-2.0
1.0
V
On-State Voltage
4.0
18.0
ON/OFF Control (Option N)
Off-State Voltage
4.0
18
V
On-State Voltage
-2.0
1.0
ON/OFF Control (Either Option)
Application notes; Figure A
ON/OFF Control Hysteresis
1.5
V
Pull-Up Voltage
4.75
5.00
5.25
V
Pull-Up Resistance
10
kΩ
Output Voltage Trim Range
-50
10
%
Measured across Pins 8 & 4; Figure B
Output Over-Voltage Protection
13.6
14.2
14.8
V
Over Full Temperature Range
Over-Temperature Shutdown
125
°C
Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis
10
°C
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
2.1
106 Hrs. TR-NWT-000332; 80% load, 300LFM, 40°C Ta
Calculated MTBF (MIL-217)
1.9
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40°C Ta
Field Demonstrated MTBF
106 Hrs. See our website for details
Note 1: Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference.
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 3: 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 500ms off-time.
Note 4: Higher values of isolation capacitance can be added external to the module.
Product # PQ50120HZx55
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 4
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
Standards and Qualifications
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:2003
Basic Insulation
CAN/CSA-C22.2 No. 60950-1:2003
EN60950-1:2001
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 # PQ50120HZx55
# Units Test Conditions
32
5
5
10
5
5
5
15 pins
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.# 005-0005483 Rev. 1
03/31/10
Page 5
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
60
100
95
50
Power Dissipation (W)
Efficiency (%)
90
85
80
75
70
44 Vin
30
20
44 Vin
10
48 Vin
65
40
48 Vin
52 Vin
52 Vin
60
0
5
10
15
20
25
30
35
Load Current (A)
40
45
50
0
55
0
5
10
15
20
25
30
35
Load Current (A)
40
45
50
55
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
50
45
40
Iout (A)
35
30
25
20
400 LFM
300 LFM
200 LFM
15
10
100 LFM
50 LFM
5
0
25
40
55
70
85
Semiconductor junction temperature is
within 1°C of surface temperature
Ambient Temperature (C)
Figure 3: Maximum output power-derating curve vs. ambient air temperature
for airflow rates of 100LFM through 400LFM with air flowing from pin 4 to pin
1 (nominal input voltage).
Figure 4: Thermal plot of converter at 36A load current (432W) with 55°C air
flowing at the rate of 200LFM. Air is flowing across the converter from pin 4 to
pin 1 (nominal input voltage).
Figure 5: Turn-on transient at full load (resistive load) (10 ms/div).
Ch 1: Vout (5 V/div)
Ch 2: ON/OFF input (5 V/div)
Figure 6: Turn-on transient at zero load (10 ms/div).
Ch 1: Vout (5 V/div)
Ch 2: ON/OFF input (5 V/div)
Product # PQ50120HZx55
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Doc.# 005-0005483 Rev. 1
03/31/10
Page 6
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
Figure 7: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/μ s; 1 ms/div). Load cap: 1uF ceramic and 470
μF electrolitic capacitors. Top trace: Vout (500 mV/div). Bottom trace: Iout (10
A/div)..
Input
Reflected
Ripple
Current
source
impedance
Input
Terminal
Ripple
Current
iS
iC
Figure 8: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5 A/μ s; 1 ms/div). Load cap: 470 μF electrolitic
capacitor. Top trace: Vout (500 mV/div). Bottom trace: Iout (10 A/div).
Output
Voltage
Ripple
DC-DC
Converter
VOUT
VSOURCE
electrolytic
capacitor
ceramic electrolytic
capacitor capacitor
Figure 9: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 10), Input Reflected Ripple Current (Figure 11) and
Output Voltage Ripple (Figure 12).
Figure 10: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 4.7 μH source impedance and 220 μF electrolytic
capacitor (1 A/div; 2 μs/div). See Figure 9.
Figure 11: Input reflected ripple current, is, through a 4.7 μH source inductor,
using a 220 μF input capacitor, at nominal input voltage and rated load current
(10 mA/div; 2 μs/div). See Figure 9.
Figure 12: Output voltage ripple at nominal input voltage and rated load current
(50 mV/div; 2 μs/div). Load capacitance: 1 μF ceramic capacitor and 15 μF
tantalum capacitor. Bandwidth: 20 MHz. See Figure 9.
Product # PQ50120HZx55
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Doc.# 005-0005483 Rev. 1
03/31/10
Page 7
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
16
14
Output Voltage (V)
12
10
8
6
4
48Vin
2
0
-30
-20
-10
0
10
20
30
40
50
60
70
Load Current (A)
Figure 13: Load current (10 A/div; 10 ms/div) as a function of time when the
converter attempts to turn on into a 1 mW short circuit.
Product # PQ50120HZx55
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Figure 14: Output voltage vs. load current showing typical current limit curves
and OVP shutdown point.
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 8
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The PowerQor Zeta 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 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(-). The
converter is available with either positive or negative 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 significantly less energy than
Schottky diodes, enabling the PowerQor converter to achieve
high efficiency.
The PowerQor series of half-brick, quarter-brick and eighth-brick
converters uses the industry standard footprint and pin-out
configuration.
In the positive logic version, the ON/OFF input is active high
(meaning that a high voltage turns the converter on). In the
negative logic version, the ON/OFF signal is active low (meaning
that a low voltage turns the converter on). Figure A details five
possible circuits for driving the ON/OFF pin.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 7 should be connected to Vout(+) and Pin 5 should be
connected to Vout(-) at the point on the board where regulation
is desired. 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 sense leads (pins 7 and 5) to determine when
it should trigger, not the voltage across the converter’s output
pins (pins 8 and 4).
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
Vin(_)
Positive Logic
(Permanently
Enabled)
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:
Rtrim-down =
(100%
)_2
D
kW
where
ON/OFF
D% =
Vnominal – Vdesired
Vnominal
x 100%
Vin(_)
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Product # PQ50120HZx55
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Doc.# 005-0005483 Rev. 1
03/31/10
Page 9
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
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
Rtrim- =
up
– 2) x V
( Vnominal
1.225
DES
+ VNOM
VDES – VNOM
kW
Figure B graphs the relationship between the trim resistor value,
Rtrim-up and Rtrim-down, showing the total range the output
voltage can be trimmed up or down.
10,000.0
Trim Resistance (kOhms)
1,000.0
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping to avoid
an input system instability problem, which is described in more
detail in the application note titled “Input System Instability”
on 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* 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. If as a result, 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 500ms
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. The
full I-V output characteristics can be seen in the figures.
100.0
10.0
1.0
0.1
0.0
0
5
10
15
20
25
% Increase in Vout
30
35
40
45
50
% Decrease in Vout
Figure B: Trim Graph for 12Vout 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 filtered to eliminate noise.
Output Over-Voltage Limit: If the voltage directly across
the output pins exceeds the “Output Over-Voltage Protection”
threshold*, the converter will immediately stop switching. This
shutdown is latching; unlike other shutdown types, the converter
will not restart unless the input power is cycled or the ON/OFF
input is toggled.
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*.
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.
* See Electrical Characteristics page.
Product # PQ50120HZx55
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 10
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
APPLICATION CONSIDERATIONS
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 C. A close-up picture of a single step is shown in Figure D.
Stepping will not occur under steady state conditions.
Current share and 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 voltage, it will cause a limit cycle oscillation. For this
reason, external feedback using the sense and trim pins is not
recommended.
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.
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 C: Output voltage resolution.
Figure D: Smallest possible Vout step at 48Vin and 12Vout.
* See Electrical Characteristics page.
Product # PQ50120HZx55
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 11
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
Application Circuits: Figure E below provides a typical circuit
diagram which details the input filtering and voltage trimming.
Input Filtering and External Input Capacitance: Figure
F below shows the internal input filter components. This filter
dramatically reduces input terminal ripple current, which otherwise
could exceed the rating of an external electrolytic input capacitor.
The recommended external input capacitance is specified in the
Input Characteristics section on the Electrical Specifications page.
More detailed information is available in the application note titled
“EMI Characteristics” on the SynQor website.
Output Filtering and External Output Capacitance: Figure
F 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.
Vin(+)
Electrolytic
Capacitor
External
Input
Filter
Vin
220µF
ESR @ 0.2W
Vout(+)
Vsense(+)
Trim
ON/OFF
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure E: Typical application circuit (negative logic unit, permanently enabled).
Lin
Vin(+)
Vout(+)
C1
C2
Regulation
Stage
Current
Sense
Isolation
Stage
Vin(_)
Vout(-)
Figure F: Internal Input and Output Filter Diagram (component values listed on specifications page).
Product # PQ50120HZx55
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 12
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
Technical Specification
Thermal Considerations: The maximum operating base-plate
temperature, TB, is 100 ºC. As long as the user’s thermal system
keeps TB < 100 ºC, the converter can deliver its full rated power.
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 base-plate and the ambient air for a given airflow
rate. This information is usually available from the heatsink
vendor. The following formula can the be used to determine the
maximum power the converter can dissipate for a given thermal
condition if its base-plate is to be no higher than 100 ºC.
max
Pdiss =
100 ºC - TA
RTHBA
This value of power dissipation can then be used in conjunction
with the data shown in Figure 2 to determine the maximum load
current (and power) that the converter can deliver in the given
thermal condition.
Product # PQ50120HZx55
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005483 Rev. 1
03/31/10
Page 13
Input:44-52V
Output:12V
Current:55A
Part No.:PQ50120HZB55
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 5 0 1 2 0 H ZB 5 0 P N S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Thermal Design
Model Number
Input Voltage
Output
Voltage
Max Output
Current
PQ50120HZB55PNS-G
44-52V
12V
55A
Performance Level
The following optionsOptions
must beDescription
included in place of the x y z
Thermal
Design
Enable Logic
Pin Style
Feature Set
spaces
in the
model numbers
listed above.
Package Size
Output Voltage
Input Voltage
B - Baseplate
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]
P - Positive
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
6,222,742
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
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ50120HZx55
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.# 005-0005483 Rev. 1
03/31/10
Page 14
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