PQ48060QNA25NKS [SYNQOR]
DC-DC Regulated Power Supply Module, 1 Output, 100W, Hybrid, QUARTER-BRICK PACKAGE-8;
| 型号： | PQ48060QNA25NKS |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 100W, Hybrid, QUARTER-BRICK PACKAGE-8 |
| 文件： | 总13页 (文件大小：739K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
High Efficiency, No Heatsink, Isolated DC/DC Converter
The PQ48060QNA17 PowerQor™ quarter 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
power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight,
height, and application effort. All of the power and
control components are mounted to the multi-layer PCB
substrate with high-yield surface mount technology.
Since the PowerQor converter has no explicit
thermal connections, it is extremely reliable.
PQ48060QNA17 Module
Operational Features
Protection Features
• Ultra-high efficiency, 88.7% at full rated load current
• Input under-voltage lockout disables converter at
low input voltage conditions
• Delivers up to 100 Watts of output power with mini-
mal derating - no heatsink required
• Output current limit and short circuit protection
protects converter from excessive load current or
short circuits
• Wide input voltage range: 35V – 75V meets or
exceeds all 48V bus standards
• Output over-voltage protection protects load from
• Fixed frequency switching provides predictable EMI
damaging voltages
performance
• Thermal shutdown protects converter from abnor-
mal environmental conditions
• No minimum load requirement means no preload
resistors required
Mechanical Features
Control Features
• Industry standard pin-out configuration (pin for pin
compatible with Lucent QHW series)
• On/Off control referenced to input side (positive
and negative logic options are available)
• Industry standard size: 1.45” x 2.3”
• Remote sense for the output voltage compensates
• Total height less than 0.40”, permits better airflow
for output distribution drops
and smaller card pitch
• Output voltage trim: +10%/-20%, permits custom
voltages and voltage margining
• Total weight: 34 grams (1.2 oz.), lower mass great-
ly reduces vibration and shock problems
Safety Features (cont.)
Safety Features
• Meets 72/23/EEC and 93/68/EEC directives
• 2000V, 10 MΩ input-to-output isolation provides
which facilitates CE Marking in user’s end product
• Board and plastic components meet 94V-0 flamma-
bility requirements
input/output ground separation
• UL 1950 recognized (US & Canada), basic insula-
tion rating
• TUV certified to EN60950
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 1
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
2.30
(58.4)
0.14
(3.6)
2.00
(50.8)
0.300
(7.62)
0.150
(3.81)
0.43
(10.8)
1.45
0.450
0.600
(15.24)
0.600
(36.8)
(11.43)
Top View
(15.24)
0.300
(7.62)
0.110 *
(2.79)
0.40
(10.2)
Shown Actual Size
Side View
* Other pin lengths available
Pin No. Name
Function
Positive input voltage (35V - 75V)
1) All dimensions in inches (mm)
2) Pins 1-3, 5-7 are 0.040” (1.02mm) dia. with
0.080” (2.03mm) dia. standoff shoulders.
3) Pins 4 and 8 are 0.062” (1.57 mm) dia. with 0.100”
(2.54mm) dia. standoff shoulders.
4) All pins are Brass with Tin/Lead plating over Nickel
5) Tolerances: x.xx in. +/-0.02 in. (0.5mm)
x.xxx in. +/-0.010 in. (0.25mm)
1
Vin(+)
2
ON/OFF
TTL input to turn converter
on and off, referenced to
Vin(-), with internal pull up.
Negative input voltage
Negative output voltage
Negative remote sense1
Output voltage trim2
3
4
5
6
7
8
Vin(-)
Vout(-)
SENSE(-)
TRIM
SENSE(+)
Vout(+)
6) Weight: 1.20 oz. (34 g)
7) Workmanship: Meets or exceeds IPC-A-610B Class II
Positive remote sense3
Positive output voltage
ABSOLUTE MAXIMUM RATINGS
Input Voltage:
Non-Operating: 100V continuous
Notes:
Operating:
80V continuous
100V 10
1. Pin 5 must be connected to Vout(-) at load.
2. Leave Pin 6 open for nominal output voltage.
3. Pin 7 must be connected to Vout(+) at load.
µs transients,1% duty cycyle
Input/Output Isolation Voltage: 2000V
Storage Temperature: -55°C to +125°C
Operating Temperature: -40°C to +115°C
Voltage at ON/OFF input pin: +18V / -2V
OPTIONS
SAFETY
The PQ48060QNA17 comes in two versions that differ by The PQ48060QNA17 series of converters are UL 1950
the sense of the logic used for the ON/OFF control signal. recognized (US & Canada) with basic insulation rating
The PQ48060QNA17P version uses positive logic; mean- and TUV certified to EN60950 requirements.
ing that the converter is on when the ON/OFF signal (Pin
The converters also meet 72/23/EEC and 93/68/EEC
2) is high. The PQ48060QNA17N version uses negative
directives as well as 94V-0 flammability requirements for
logic; the converter is on when the ON/OFF signal is low.
board and plastic components.
Logic input is TTL compatible with an internal pull up.
An external input fuse must always be used to meet these
Patents: SynQor is protected under various patents, safety requirements.
including but not limited to U.S. Patent # 5,999,417.
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 2
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
PQ48060QNA17 ELECTRICAL CHARACTERISTICS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40°C to +115°C ambient
temperature with appropriate power derating.)
PARAMETER
NOTES and CONDITIONS
PQ48060QNA17
Min.
35
Typ.
Max.
Units
V
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
48
75
32
28.5
2.5
33
29.5
3.5
34
30.5
4.5
3.5
120
3
V
V
V
100% Load, 35Vin
A
80
1.6
.01
5
mA
mA
Off Converter Input Current
Inrush Current Transient Rating
Input Reflected-Ripple Current
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
2
A s
P-P thru 10µH inductor; Figures 13 & 15
mA
V
5.910
5.79
6.000
6.090
+
+
+
+
2
2
10
10
mV
mV
mV
V
Over Line
+
+
Over Temperature
45
120
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
over sample load, line and temperature
20MHz bandwidth; Figures 13 & 16
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
6.22
50
100
20
mV
mV
A
RMS
10
Operating Output Current Range
Output DC Current-Limit Inception
Short-Circuit Protection (redundant shutdown)
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time to 1%
0
16.67
22
Output Voltage 10% Low; Figure 17
18
43
20
46
A
49
A
120 Hz; Figure 20
470µF load cap, 5A/µs; Figure 12
50% Io to 75% Io
73
dB
240
240
300
mV
mV
µs
75% Io to 50% Io
Turn-On Transient
Turn-On Time
Figures 9 & 10
4
8
12
215
ms
ms
µF
Start-Up Inhibit Period
-40°C to +125°C; Figure F
180
200
Maximum Output Capacitance
EFFICIENCY
Full load; 5% overshoot of Vout at startup
6,000
100% Load
Figure 1
88.7
89.5
%
%
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Package rated to 150°C
Board rated to 165°C
Figures 5 & 7
125
125
125
°C
°C
°C
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage
2000
10
V
Isolation Resistance
M
Ω
Isolation Capacitance
6800
215
pF
FEATURE CHARACTERISTICS
Switching Frequency
195
235
kHz
ON/OFF Control (Option P)
Off-State Voltage
-2
0.8
18
V
V
On-State Voltage
2.4
ON/OFF Control (Option N)
Off-State Voltage
2.4
-2
18
V
V
On-State Voltage
0.8
ON/OFF Control (Either Option)
Pull-Up Voltage
See circuit diagram; Figure E
Pull up to Vin/6
Vin/6.5
40
9.2
V
Pull-Up Resistance
k
Ω
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection
Over-Temperature Shutdown
Across Pins 8 & 4; Figures B & C
Across Pins 7 & 5
-20
+10
+10
127
%
%
%
Over full temp range; % of nominal Vout
Average PCB Temperature
117
122
125
°C
Specifications subject to change without notice.
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 3
Performance Curves
Brick
Quarter
48V 6.0V
16.7A
out
in
95
90
85
80
75
70
65
60
90
89
88
87
86
85
84
83
36 Vin
48 Vin
75 Vin
25 C
40 C
55 C
82
0
100
200
300
400
500
0
2
3
5
7
8
10
12
13
15
17
Air Flow (LFM)
Vin = 48V
Load Current (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
Figure 2: Efficiency at 60% rated power vs. airflow rate for ambient
maximum input voltage at 25
°C .
air temperatures of 25
°
C, 40
°C, and 55
°
C and nominal input voltage.
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
16
14
12
10
8
6
4
36 Vin
48 Vin
75 Vin
25 C
40 C
55 C
2
0
0
2
3
5
7
8
10
12
13
15
17
0
100
200
300
400
500
Vin = 48V
Air Flow (LFM)
Load Current (A)
Figure 3: Power dissipation vs. load current for minimum, nominal,
Figure 4: Power dissipation at 60% rated power vs. airflow rate for
and maximum input voltage at 25
°C.
ambient air temperatures of 25
voltage.
°C, 40°C, and 55°C and nominal input
16
14
12
10
8
6
4
2
0
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 m/s)
Semiconductor junction temperature is
within 2 C of surface temperature
°
0
25
40
55
70
85
Ambient Air Temperature (oC)
Vin = 48V
Figure 5: Maximum output power-derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
across the converter from pin 1 to pin 3. (nominal input voltage).
Figure 6: Thermal plot of converter at 13.2 amp load current with 55°C
air flowing at the rate of 200 LFM. Air is flowing across the converter
sideways from pin 1 to pin 3 (nominal input voltage).
Product # PQ48060QNA17
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9/5/01
Page 4
Performance Curves
Brick
Quarter
48V 6.0V
16.7A
out
in
16
14
12
10
8
6
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 m/s)
4
2
0
Semiconductor junction temperature is
within 2 C of surface temperature
0
25
40
55
70
85
°
Ambient Air Temperature (oC)
Vin = 48V
Figure 7: Maximum output power-derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
lengthwise from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 13.3 amp load current with 55°C
air flowing at the rate of 200 LFM. Air is flowing across the converter
in the long direction from input to output (nominal input voltage).
Figure 9: Turn-on transient at full rated load current (resistive load), (2
ms/div). Top Trace: Vout; 2V/div
Figure 10: Turn-on transient at zero load current (2 ms/div).
Top Trace: Vout; 2V/div
Bottom Trace: ON/OFF input; 5V/div
Bottom Trace: ON/OFF input; 5V/div
Figure 11: Output voltage response to step-change in load current (50%-75%-50%
Figure 12: Output voltage response to step-change in load current (50%-75%-
of Imax; dI/dt = 0.1A/
µ
s). Load cap: 10
µ
F, 100 m
W
ESR tantalum capacitor and
50% of Imax: dI/dt = 5A/µs). Load cap: 470µF, 30 mW ESR tantalum capacitor
1µF ceramic capacitor. Top trace: Vout (200mV/div), Bottom trace: Iout (5A/div).
and 1
µF ceramic capacitor. Top trace: Vout (200mV/div), Bottom trace: Iout
Product # PQ48060QNA17 Phone 1-888-567-9596
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9/5/01
Page 5
Performance Curves
Brick
Quarter
48V 6.0V
16.7A
out
in
Figure 15
10
µH
Figure 14
source
impedance
Figure 16
iS
iC
DC/DC
Converter
VOUT
VSOURCE
10
µ
Ω
F,
ESR
1 µF
47 µF,
ceramic
100m
<1
Ω ESR
capacitor
tantalum
electrolytic
capacitor
capacitor
Figure 13: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 14), Input Reflected Ripple Current
(Figure 15) and Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, i , at full rated output current
c
and nominal input voltage with 10
µH source impedance and 47µF elec-
trolytic capacitor (200 mA/div). (See Figure 13)
Figure 15: Input reflected ripple current, i , through a 10
µ
H source
Figure 16: Output voltage ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 1 F ceramic capacitor
and 10 F tantalum capacitor. Bandwidth: 20 MHz. (See Figure 13)
s
inductor at nominal input voltage and rated load current (10 mA/div).
(See Figure 13)
µ
µ
8.0
7.0
6.0
5.0
4.0
3.0
2.0
36 V
1.0
0.0
48 V
75 V
0
2.5
5
7.5
10
12.5
15
17.5
20
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit
Figure 18: Load current (10A/div) as a function of time when the con-
verter attempts to turn on into a 10 m short circuit. Top trace is an
expansion of the on-time portion of the bottom trace.
curves and converter shutdown points.
W
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C 9/5/01
Page 6
Performance Curves
Brick
Quarter
48V 6.0V
16.7A
out
in
1
0.1
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
36 Vin
48 Vin
75 Vin
36 Vin
48 Vin
75 Vin
0.01
0.001
0.0001
-110
10
10
100
1,000
Hz
10,000
100,000
100
1,000
Hz
10,000
100,000
Figure 19: Output impedance (Z
= V /I ) for minimum, nomi-
Figure 20: Forward Transmission (FT = V /V ) for minimum, nomi-
out
out out
out in
nal, and maximum input voltage at full rated power.
nal, and maximum input voltage at full rated power.
0
-10
-20
-30
-40
-50
-60
100
10
36 Vin
48 Vin
75 Vin
36 Vin
48 Vin
75 Vin
1
0.1
10
100
1,000
Hz
10,000
100,000
10
100
1,000
Hz
10,000
100,000
Figure 21: Reverse Transmission (RT = I /I ) for minimum, nomi-
Figure 22: Input impedance (Z = V /I ) for minimum, nominal, and
in in in
in out
nal, and maximum input voltage at full rated power.
maximum input voltage at full rated power.
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 7
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
the converter. Because the PowerQor converter is much
lighter, vibration and shock-induced problems are greatly
reduced. Moreover, due to the lack of failure-prone explicit
thermal connections and the lack of potting material the
PowerQor converter is more reliable than conventional
dc/dc converters.
BASIC OPERATION AND
FEATURES
The PowerQor series converter uses a two-stage power cir-
cuit 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.
The PowerQor series converter uses the industry standard
pin-out configuration used by other vendors of comparably
sized and rated dc/dc converters. The unit is pin for pin
compatible with the Lucent QW series.
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 used in conventional dc/dc converters. This
is the primary reason that the PowerQor converter has such
high efficiency—even at very low output voltages and very
high output currents.
The PowerQor converter has many standard control and
protection features. All shutdown features are non-latching,
meaning that the converter shuts off for 200ms before
restarting. (see Figure F)
• An ON/OFF input permits the user to control when the
converter is on and off in order to properly sequence dif-
ferent power supplies and to reduce power consumption
during a standby condition.
Dissipation throughout the converter is so low that the
PowerQor converter requires no heatsink to deliver
a greater level of power than can be delivered by a con-
ventional, Schottky-diode-based dc/dc converter with a
0.5” high heatsink. At equivalent ambient air temperature,
airflow rate, and output power level, the hottest semicon-
ductor junction temperature and the hottest PCB temperature
within the PowerQor converter are cooler than those found
in conventional dc/dc converters with a 0.5” high heatsink
attached.
• Remote sense inputs permit the user to maintain an
accurate voltage at the load despite distribution voltage
drops between the converter’s output and the load.
• An output voltage trim input permits the user to trim
the output voltage up or down to achieve a custom volt-
age level or to do voltage margining.
• An input under-voltage lockout avoids input system
instability problems while the input voltage is rising.
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 using
high yield surface mount techniques on a PCB substrate.
• The output current limit protects both the converter
and the board on which it is mounted against a short cir-
cuit condition.
• An output over-voltage limit circuit shuts the unit
down if the output voltage at the output pins gets too
high.
Unlike conventional dc/dc converters, which have critical
thermal connections between the power components and the
baseplate, and between the baseplate and the heatsink, the
PowerQor converter has no explicit, failure-prone thermal
connections.
• A sensor located in a central spot of the PCB provides a
PCB temperature limit. If, due to an abnormal con-
dition, this spot gets too hot, the converter will turn off.
Once the converter has cooled, it will automatically turn
on again without the need to recycle the input power.
Compared to a conventional Schottky-diode-based dc/dc
converter with a 0.5” high heatsink, the PowerQor convert-
er is more efficient and therefore it dissipates less than half
the energy. Additionally, because the PowerQor converter is
thinner (0.4” vs. 1.0”), the board-to-board pitch in a rack
can be much smaller, and cooling airflow is less impeded by
CONTROL PIN DESCRIPTIONS
Pin 2 (ON/OFF): The ON/OFF input, Pin 2, permits the
user to control when the converter is on or off. This input is
Product # PQ48060QNA17
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Page 8
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
referenced to the return terminal of the 48V input bus. There
are two versions of the PowerQor series converter that differ
by the sense of the logic used for the ON/OFF input. In the
PQxxyyyQNAzzPxx version, the ON/OFF input is active
high (meaning that a high turns the converter on). In the
PQxxyyyQNAzzNxx 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.
it should trigger, not the voltage across the converter’s sense
pins (pins 7 and 5). Therefore, the resistive drop on the
board should be small enough so that output OVP does not
trigger, even during load transients.
Pin 6 (TRIM): The TRIM input permits the user to adjust the
output voltage across the sense leads up or down. To lower
the output voltage, the user should connect a resistor
between Pin 6 and Pin 5, which is the SENSE(-) input. To
raise the output voltage, the user should connect a resistor
between Pin 6 and Pin 7, which is the SENSE(+) input.
Pins 7 and 5 (SENSE(+)): The SENSE(+) inputs correct
for voltage drops along the conductors that connect the con-
verter’s output pins to the load.
A resistor connected between Pin 6 and Pin 5 will decrease
the output voltage. For a desired decrease of ∆ percent of
the nominal output voltage, the value of this resistor should
be
Pin 7 should be connected to Vout(+) and Pin 5 should be
connected to Vout(-) at the point on the board where regu-
lation is desired. That is,
[Vout(+) - Vout(-)] – [SENSE(+) - SENSE (-)] < 10%Vout
511
R
(kΩ)
- 10.22
=
trim-down
(∆% )
Pins 7 and 5 must be connected for proper regulation of the
output voltage. However, if these connections are not made,
nothing catastrophic will happen to the converter under nor-
mal operating conditions—the converter will simply deliver
an output voltage that is slightly higher than its specified
value.
where
and
VNOM – VDES
=
x 100%
∆
( )
VNOM
VNOM = Nominal Voltage
VDES = Desired Voltage
Note: the output over-voltage protection circuit senses the
voltage across the output (pins 8 and 4) to determine when
ON/OFF
ON/OFF
ON/OFF
_
_
_
Vin( )
Vin( )
Vin( )
Negative Logic
(Permanently Enabled)
Positive Logic
(Permanently Enabled)
Remote Enable Circuit
ON/OFF
5V
TTL/
CMOS
ON/OFF
_
_
Vin( )
Vin( )
Open Collector Enable Circuit
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
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Page 9
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
Figure B graphs this relationship between R
The output voltage can be trimmed down as much as 20%.
and ∆.
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 tran-
sients.
trim-down
10,000
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 +10%/-20%
1,000
100
10
PROTECTION FEATURES
0
2
4
6
8
10
12
14
16
18
20
Input Under-Voltage Lockout: The converter is
designed to turn off when the input voltage is too low, help-
ing avoid an input system instability problem, described in
more detail below. The lockout circuitry is a comparator with
dc hysteresis. When the input voltage is rising, it must
exceed a typical value of 33V before the converter will turn
on. Once the converter is on, the input voltage must fall
below a typical value of 29.5V before the converter will turn
off.
% Decrease in Output Voltage
Figure B: Trim Down Graph for 6.0Vout
A resistor connected between Pin 6 and Pin 7 will increase
the output voltage. For a desired increase of ∆ percent of the
nominal output voltage, the value of this resistor should be
5.11VOUT(100+∆%)
1.225∆%
511
Output Current Limit: The current limit does not change
appreciably 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 approximately 60% of
its nominal value, the converter turns off.
_
_
R
=
trim-up
where
(kΩ)
10.22
)
(
∆%
VOUT = Nominal Output Voltage
The converter then enters a 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 pre-
vents excessive heating of the converter or the load board
(see Figure 18).
Figure C graphs this relationship between Rtrim-up and ∆.
The output voltage can be trimmed up as much as 10%.
100,000
10,000
1,000
100
Output Over-Voltage Limit: If the voltage across the
output pins exceeds the O.V. threshold, the converter will
immediately stop switching. This prevents damage to the
load circuit due to 1) a sudden unloading of the converter,
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.
Thermal Shutdown: The PowerQor series has a temper-
ature sensor located such that it senses the average temper-
ature of the converter. The thermal shutdown circuit is
designed to turn the converter off when the temperature at
0
1
2
3
4
5
6
7
8
9
10
% Increase in Output Voltage
Figure C: Trim Up Graph for 6.0Vout
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 10
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
the sensed location reaches 115°C. It will allow the con-
verter to turn on again when the temperature of the sensed
location falls below 110°C.
APPLICATION CONSIDERATIONS
Input System Instability: This condition can occur
because a dc/dc converter appears incrementally as a
negative resistance load. A detailed application note titled
“Input System Instability” is available on the SynQor web
site (www.synqor.com) which provides an understanding
of why this instability arises, and shows the preferred solu-
tion for correcting it.
Application Circuits: Figure D below provides a typical
circuit diagram which is useful when using input filtering
and voltage trimming. Figure E is a detailed look of the inter-
nal ON/OFF circuitry that is shown in Figure A.
Input Filtering
Vin(+)
Vout(+)
Vsense(+)
Electrolytic
Capacitor
33µF
Rtrim-up
or
ESR
1Ω
Trim
ON/OFF
Rtrim-down
Cload
Iload
_
35V < Vin < 75V
Vsense( )
_
_
Vin( )
Vout( )
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Vin(+)
5V
274k
50k
ON/OFF
TTL
100pF
50k
_
Vin( )
Figure E: Internal ON/OFF pin circuitry
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 11
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
STARTUP INHIBIT PERIOD
Figure F shows three turn-on scenarios, where a Startup
Inhibit Period is initiated at t0, t1, and t2:
The Startup Inhibit Period ensures that the converter will
remain off for at least 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 over-
heating. In all, there are seven ways that the converter can
be shut down, initiating a Startup Inhibit Period:
Before time t0, when the input voltage is below 34V (typ.),
the unit is disabled by the Input Under-Voltage Lockout fea-
ture. When the input voltage rises above 34V, 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.
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-
brick)
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.
• Output Over-Voltage Protection
• 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 4ms
(typ.) "Turn On Time."
• Short Circuit Protection
• Turned off by the ON/OFF input
V
in
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(pos logic)
ON
OFF ON
OFF
ON
V
4ms (typical
turn on time)
out
200ms
(typical start-up
inhibit period)
200ms
200ms
t
t0
t1
t2
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 12
Technical Specification
Quarter
48V 6.0V
16.7A
out
in
Brick
PART NUMBERING SYSTEM
The part numbering system for SynQor’s PowerQor DC/DC
converters has the following format:
Quarter-Brick Product Family and Part Numbering Scheme
Output
Voltage
Performance
Series
Thermal
Design
"Rated"
Output Current
Pos./Neg.
Logic
Product Family Input Voltage
Package Size
Pin Length
Features
PQ
48
033
Q
N
A
25
N
N
S
015 - 1.5V
018 - 1.8V
020 - 2.0V
025 - 2.5V
033 - 3.3V
050 - 5.0V
060 - 6.0V
120 - 12V
150 - 15V
25 - 25 Amps
K - 0.110"
A - Open Frame
B - Baseplate
P - Positive N - 0.145"
N - Negative R - 0.180"
Y - 0.250"
PQ - PowerQor 48 - (35v-75v)
Q - Quarter Brick N - Normal
S - Standard
20 - 20 Amps
17 - 16.67 Amps
08 - 8.33 Amps
07 - 6.67 Amps
Base Part Number
Options
Example part #: PQ48033QNA25NNS
This part number indicates a PowerQor converter with
48Vin, 3.3Vout, quarter-brick size, normal performance
level, open air design, 25 amps output current, negative
logic, 0.145” pins, and the standard feature set.
When ordering SynQor converters, please ensure that you
use the complete 15 character part number.
Contact SynQor for further information:
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our web site or is available upon request from
SynQor.
Phone:
Toll Free: 888-567-9596
Fax:
978-567-9596
978-567-9599
E-mail:
Web:
sales@synqor.com
www.synqor.com
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.
Address: 188 Central Street
Hudson, MA 01749
Product # PQ48060QNA17
Phone 1-888-567-9596
Doc.# 005-2QN460D_C
9/5/01
Page 13
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