10A/180W

Technical
Specification
PQ50180HTB10
48V
18V
10A
2000V dc
Half-brick
Input
Output
Current
Isolation
DC-DC Converter
The PQ50180HPB10 PowerQor Tera half-brick converter
is a next-generation, board-mountable, isolated,
fixed switching frequency DC/DC converter that uses
synchronous rectification to achieve extremely high
conversion efficiency.The Tera series converters offer
the maximum usable output current for a standard
“half-brick” module. RoHS compliant (see last page).
Operational Features
•
•
•
•
Ultra-high efficiency, 93% at full rated load
Delivers up to 180W of output power with minimal derating
Operating input voltage range: 44-52V
Fixed frequency switching provides predictable EMI performance
Mechanical Features
•
•
•
•
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)
Protection Features
Control 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%
• 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
Safety Features
Contents
Pending
• 2000V, 30MΩ input-to-output isolation
• UL 60950-1 recognized (US & Canada), basic insulation rating
• TUV certified to EN6095-1
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Product # PQ50180HTB10
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Page No.
MECHANICAL DIAGRAM (base-plated) . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Standards and Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Doc.# 005-0005486 Rev. B
04/14/10
Page 1
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
Baseplated Mechanical Diagram
2.40 [61.0]
1.400 [35.56]
1.000 [35.56]
TOP VIEW
SIDE VIEW
.700
[17.78]
.400 [10.16]
.300 [7.62]
.55
[14.0]
C
9
8
7
6
5
2.30
[58.4]
.20
[5.1]
1.90
[48.3]
1.90
[48.3]
.19
[58.4]
1
2 A B 3
.50 [12.7]
.600 [15.24]
.800 [20.32]
2.00 [50.8]
4
.20 [5.1]
M3 THREADED INSERT
4 PLACES
SEE NOTE 1 & 2
PIN FARSIDE TYPICAL
SEE NOTE 4 - 8
NOTES
1)
2)
3)
4)
5)
.037 +/- .029
[ .94 +/- .74MM]
BOTTOMSIDE
CLEARANCE
PIN DESIGNATIONS
M3 screws used to bolt unit's baseplate to other surfaces (such
as heatshink) must not exceed 0.125" (3.18mm) depth below
the surface of the baseplate.
Applied torque per screw should not exceed 6in-lb (0.68Nm).
Baseplate flatness tolerance is 0.004” (.10mm) TIR for surface
Pins 3, A, B & C only included in full feature models
Pins 1-4, 6-8, A-C are 0.040” (1.02mm) diameter, with 0.080”
(2.03mm) diameter standoff shoulders.
6)
Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125” (3.18mm)
diameter standoff shoulders.
7) Other pin extension lengths available.
8) All Pins: Material: Copper Alloy
Finish: Matte Tin over Nickel plate
9) Undimensioned components are shown for visual reference only.
10) Weight: 4.3oz (123g)
11) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
12) Workmanship: Meets or exceeds IPC-A-610C Class II
Product # PQ50180HTB10
.145
[3.68]
SEE NOTE 5
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Pin
Name
1
Vin(+)
2
ON/OFF
Function
Positive input voltage
TTL input to turn converter on and off,
referenced to Vin(-), with internal pull up.
Single wire parallel signal
3
I share
4
5
6
7
8
9
A
Vin(–)
Vout(-)
SENSE(-)
TRIM
SENSE(+)
Vout(+)
Clock Sync
Negative input voltage
Negative output voltage
Return remote sense
Output voltage trim
Positive remote sense
Positive output voltage
Clock synchronization
B
Start Sync
Startup synchronization
C
OR Drive
External OR-FET drive
Notes: Pins in Italics shaded text are Optional
Doc.# 005-0005486 Rev. B
04/14/10
Page 2
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
PQ50180HTB10 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 # PQ50180HTB10
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
4.5
105
5
0.03
90
2
1.3
5
145
20
2\4\4.1
47
17.85
18.00
±0.05 \ 8
±0.1 \ 15
±45
17.72
50
15
0
10.5
0.1
0
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11.4
12.5
0.4
10
18.15
Continuous
Continuous
Input to output
Baseplate temperature
V
V
V
A
100% Load, 44 Vin
mA
mA
A
V
1000V/ms input transient
mA
RMS thru 10μH inductor
mA
RMS
A
µF\µH\µF internal values
µF
Typical ESR 0.1-0.2 Ω
V
±0.1 \ 15 % \ mV
+0.2 \ 30 % \ mV
±90
mV
18.29
V
Over sample, line, load, temperature & life
20 MHz bandwidth
100
mV
Full load
mV
30
Full load
10
A
Subject to thermal derating
12.3
A
Output voltage 10% Low
V
0.7
A
Negative current drawn from output
50
mA
Negative current drawn from output
3,000
µF
Vout nominal at full load (resistive load)
93
93
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%
%
Doc.# 005-0005486 Rev. B
04/14/10
Page 3
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
PQ50180HTB10 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.
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
70
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
700
Step Change in Output Current (5 A/µs)
700
Settling Time
300
Turn-On Transient
Turn-On Time
20
30
Start-Up Inhibit Time
180
200
240
Output Voltage Overshoot
0
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
2000
Isolation Resistance
30
Isolation Capacitance (input to output)
3300
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
Board Temperature
125
Transformer Temperature
125
Maximum Baseplate Temperature
100
FEATURE CHARACTERISTICS
Switching Frequency
205
230
255
ON/OFF Control (Option P)
Off-State Voltage
-2
0.8
On-State voltage
2.7
18
ON/OFF Control (Option N)
Off-State Voltage
2.7
18
On-State voltage
-2
0.8
ON/OFF Control (either Option)
Pull-Up Voltage
Vin/6
15
Pull-Up Resistance
42
Output Voltage Trim Range
-20
+10
Output Voltage Remote Sense Range
+10
Output Over-Voltage Protection
117
122
127
Over-Temperature Shutdown OTP Trip Point
120
Over-Temperature Shutdown Restart Hysteresis
10
Load Current Scale Factor
178
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
2.2
Calculated MTBF (MIL-217) MIL-HDBK-217F
1.3
Field Demonstrated MTBF
Note 2: Higher values of isolation capacitance can be added external to the module.
Product # PQ50180HTB10
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Units Notes & Conditions
dB
120 Hz
mV
mV
µs
50% to 75% to 50% Iout max
50% to 75% to 50% Iout max
To within 1% Vout nom
ms
ms
%
Full load, Vout=90% nom.
V
MΩ
pF
See Absolute Maximum Ratings
°C
°C
°C
°C
Package rated to 150 °C
UL rated max operating temp 130 °C
kHz
Regulation and isolation stages
3,000 µF load capacitance, Iout = 0A
See Note 2
Applies to baseplated units only
V
V
V
V
V
kΩ
%
%
%
°C
°C
Measured across Pins 10 & 5; Figure C
Measured across Pins 10 & 5
Over full temp range; % of nominal Vout
Average PCB Temperature
See App Note: Output Load Current Calc.
106 Hrs. 75% load, 300LFM, 40 °C Ta
106 Hrs. 75% load, 300LFM, 40 °C Ta
106 Hrs. See our website for details
Doc.# 005-0005486 Rev. B
04/14/10
Page 4
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
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 # PQ50180HTB10
# 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.# 005-0005486 Rev. B
04/14/10
Page 5
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
95
94
90
93
Efficiency (%)
95
Efficiency (%)
100
85
80
92
91
44 Vin
25º C
48 Vin
75
52 Vin
70
0
1
2
3
4
5
6
Load Current (A)
7
8
9
0
100
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).
18
12
16
11
Power Dissipation (W)
14
Power Dissipation (W)
55º C
89
10
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
12
10
8
6
4
44 Vin
48 Vin
2
0
1
2
3
4
5
6
Load Current (A)
7
8
9
10
9
8
7
6
25º C
40º C
5
52 Vin
0
55º C
4
10
Figure 3: Power dissipation at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
0
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).
20
10
18
9
16
8
Output Voltage (V)
7
Iout (A)
40º C
90
6
5
4
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)
3
2
1
25
10
8
6
44 Vin
48 Vin
2
40
55
70
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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52 Vin
0
85
0
Ambient Air Temperature (oC)
Product # PQ50180HTB10
12
4
0
0
14
2
4
6
Load Current (A)
8
10
12
Figure 6: Output voltage vs. load current showing typical current limit curves and
converter shutdown points.
www.synqor.com
Doc.# 005-0005486 Rev. B
04/14/10
Page 6
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
Figure 7: Turn-on transient at full load (resistive load) (10 ms/div). Input voltage
pre-applied. Top Trace: Vout (5V/div). Bottom Trace: ON/OFF input (5V/div)
Figure 8: Turn-on transient at zero load (10 ms/div). Top Trace: Vout (5V/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 (500mv/div), Bottom Trace:Iout (5A/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 (500mv/div), Bottom Trace:Iout (5A/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).
Product # PQ50180HTB10
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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
(100mA/div). (See Figure 11).
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Doc.# 005-0005486 Rev. B
04/14/10
Page 7
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
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
(20 mV/div). Load capacitance: two 1µF ceramic capacitors and 15µF tantalum
capacitor. Bandwidth: 20 MHz. (See Figure 11).
Figure 15: Load current (10A/div) as a function of time when the converter attempts
to turn on into a 1 mΩ short circuit. Top trace (2ms/div) is an expansion of the
on-time portion of the bottom trace.
Product # PQ50180HTB10
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Doc.# 005-0005486 Rev. B
04/14/10
Page 8
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
0
10
1
0.1
44 Vin
48 Vin
52 Vin
0.01
-20
Forward Transmission (dB)
Output Impedance (ohms)
-10
-30
-40
-50
-60
-70
44 Vin
48 Vin
52 Vin
-80
-90
0.001
-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.
10
100
Input Impedance (ohms)
Reverse Transmission (dB)
0
-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
10
100,000
Hz
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1,000
10,000
100,000
Hz
Figure 18: Magnitude of incremental reverse transmission (RT = iin/iout) for
minimum, nominal, and maximum input voltage at full rated power.
Product # PQ50180HTB10
100
Figure 19: Magnitude of incremental input impedance (Zin = vin/iin) for minimum,
nominal, and maximum input voltage at full rated power.
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Doc.# 005-0005486 Rev. B
04/14/10
Page 9
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
Technical Specification
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The 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 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
TTL/
CMOS
Vin(_)
Open Collector Enable Circuit
Vin(_)
Positive Logic
(Permanently
Enabled)
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.
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
162k
Vin(_)
ON/OFF
50k
50k
TTL
Direct Logic Drive
100pF
100k
50k
Figure A: Various circuits for driving the ON/OFF pin.
Vin(_)
Figure B: Internal ON/OFF pin circuitry
Product # PQ50180HTB10
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Doc.# 005-0005486 Rev. B
04/14/10
Page 10
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
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)
100,000
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” 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.
10,000
1,000
100
10
1
0
2
4
6
8
% increase Vout
10
12
14
16
18
20
% decrease Vout
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 # PQ50180HTB10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005486 Rev. B
04/14/10
Page 11
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
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 # PQ50180HTB10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005486 Rev. B
04/14/10
Page 12
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
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 # PQ50180HTB10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005486 Rev. B
04/14/10
Page 13
Input:44-52V
Output:18V
Current:10A
Part No.:PQ50180HTB10
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 8 0 H T B 1 0 N N S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
Output Current
Thermal Design
PQ50180HTB10NNS
Input
Output
Max Output
Voltage
Voltage
Current
44-52V
18V
10A
Performance Level
Package Size
Output Voltage
Options Description: w x y z
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]
Thermal Design
Enable Logic
Pin Style
B - Baseplated
N - Negative
N - 0.145"
Feature Set
S - Standard
Not all combinations make valid part numbers, please contact
SynQor for availability. See the Product Summary web page for
more options. 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
6,896,526 6,927,987
7,119,524 7,269,034
7,564,702
6,594,159
7,050,309
7,272,021
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ50180HTB10
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.# 005-0005486 Rev. B
04/14/10
Page 14
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