PAQ Series
www.murata-ps.com
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Convert
Converter with 2:1 Wide Input Range
Typical units
KEY PRODUCT FEATURES
PRODUCT OVERVIEW
VERVIEW
2:1 Input Voltage Range (36V – 75V)
Murata Power Solutions’ fully isolated Power
Amplifiers Quarter-Brick series of DC-DC converters is used in power radio-applications and is
optimized for the new generation of micro cell
transmitter applications requiring up to 150W. With
an input voltage range of 36 to 75 Volts, the PAQ
Series delivers up to 5 Amps of output current from
a fully regulated 29.8V output.
The PAQ offers a wide output voltage range
with the flexibility to adjust its output voltage with
the range of 23.84 to 32.78V (29.8V nom) that
accommodates multiple power-amplifiers designs,
industry leading efficiency (92.5% @29.8Vout full
load), and optimized design to reduce component
count for increased reliability. Design features
include an optional baseplate that is optimized for
RFPA applications being deployed in sealed box
applications with its heat sink fixed directly to the
host equipment chassis.
Trimmable 23.84 (-20%) to 32.78 (10%) Volts
output (29.8V, nom)
Up to 150W output power @ 36 - 75Vin
Efficiency = 92.5% (typ)
Industry standard 1/4 brick package
Optional Baseplate for conduction cooling
applications
Optional Baseplate to ground connection pin
Positive & negative logic on/off control option
Monotonic startup into pre-bias/pre load output
conditions
Over-current (power limiting); Over-temperature
protection; Over-Voltage Protection
Low output ripple and noise
Strong thermal derating performance
The PAQ is designed as an open-frame ¼ brick,
through-hole mounting, with options for positive
or negative logic and optional baseplate. Intended
markets include Micro Base Stations (Micro Cell
Transmitters, RFPA (radio frequency power amplifiers),
Microwave Radio communications, and Telecom and
Data Equipment applications where a 2:1 input voltage, 23 to 33Vout and isolated power is needed.
The PAQ offers Output over voltage, over current
protection, thermal shutdown, Input under-voltage
lockout, and short circuit protection. The option for
adding a baseplate for cold plate applications is
also available with an optional baseplate to ground
connect pin. The modules are designed to meet
Conducted EMI requirement for class B with an
optional external filter. The PAQ provides voltage
isolation (basic) from input to output of 2250V. The
PAQ series is certified to safety standards UL/EN/
IEC/CSA 60950-1, 2nd edition.
Operational temperature range –40°C to
+100°C (baseplate temperature)
2250V I/O isolation, Basic insulation
Certified to UL/EN 60950-1, CSA-C22.2 No.
60950-1, 2nd edition safety approvals
+Vin
F1
+Vout
Barrier
Baseplate ground
External (B3 option)
DC
Power
Source
Controller
and Power
Open = On
On/Off
Control
Reference and
Error Amplifier
Trim
logic)
-Vin
-Vout
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions recommends an external fuse.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_PAQ Series.A02 Page 1 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
ORDERING GUIDE ➀
Output
Input
R/N (mV
pk-pk)
IOUT
IIN full
Regulation (Max.) ➁
VOUT (Amps, Power
load
VIN Nom. Range
IIN no
Line
Load
(Volts) max.) (Watts) Typ. Max.
(Volts) (Volts) load (mA) (Amps)
Root Model ➀
PAQ-29/5-D48-C
29.8
5
150
40
90
±0.1%
±0.1%
48
➀ Please refer to the part number structure for additional ordering information and options.
➁ All specifications are typical at nominal line voltage and full load, +25°C unless otherwise noted. See
36-75
85
3.36
Efficiency
Min.
Dimensions (open frame)
Typ.
91% 92.5%
(inches)
(mm)
2.3x1.45x0.46
58.4x36.8x11.7
detailed specifications. Output capacitors are 1 μF || 10 μF with a 22μf input capacitor. These caps are
necessary for our test equipment and may not be needed for your application.
PART NUMBER STRUCTURE
PAQ - 29 / 5 - D48 N B 3 Lx - C
Power Amplifier
Quarter-Brick
Nominal Output Voltage (29.8V)
Maximum Rated Output
Current in Amps
Input Voltage Range
D48 = 36-75 Volts (48V nominal)
On/Off Control Logic
N = Negative logic
P = Positive logic
RoHS Hazardous Materials compliance
C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Pin length option
Blank = standard pin length 0.190 in. (4.8 mm)
L1 = 0.110 in. (2.79 mm)*
L2 = 0.145 in. (3.68 mm)*
Baseplate Pin 3, see Mechanical Drawings (special order)*
Blank = No pin 3, standard
3 = Pin 3 installed, optional
*Minimum order quantity is required.
Baseplate Option
Samples available with standard pin
Blank = No baseplate, standard
length only.
B = Baseplate installed, optional
Note:
Some model number combinations may
not be available. See website or contact
your local Murata sales representative.
PAQ Pin 3 Baseplate Connection
The PAQ module has an additional pin 3 on special order that connects to the baseplate but is
electrically isolated from the rest of the converter. Please refer to the mechanical drawings.
Pin 3 offers a positive method of controlling the electrical potential of the baseplate, independent of the converter.
The baseplate may be ordered by adding a “B” to the model number tree and pin 3 will be preinstalled by adding a “3.” The two options are separate. Please refer to the Ordering Guide. Do
not order pin 3 without the baseplate. Note that “pin 3” converters may be on limited forecast,
requiring minimum order quantities and scheduled deliveries.
Complete Model Number Example: PAQ-29/5-D48NBL1-C
Negative On/Off logic, baseplate installed, 0.110˝ pin length, RoHS-6 compliance
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MDC_PAQ Series.A02 Page 2 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
FUNCTIONAL SPECIFICATIONS
Conditions ➀ /Comments
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
On/Off Remote Control
Output Power
Minimum
Typical/Nominal
0
100 mS max. duration
Input to output, continuous
Power on, referred to -Vin
Maximum
80
100
2250
13.5
150.49
0
0
Units
Vdc
Vdc
Vdc
Vdc
W
Current-limited, no damage, short-circuit
0
5
A
protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifications Table is not implied or recommended.
Output Current
Conditions ➀ ➂
INPUT
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
Pre-biased startup
Fast blow
Rising input voltage
Falling input voltage
36
48
32.75
31
33.5
32
L-C
Vin = nominal
Vin = minimum
3.36
4.45
0.125
0.2
85
2
25
Iout = 0, unit = ON
Measured at input with specified filter
External output voltage < Vset. Monotonic
75
8
35
34
Vdc
A
Vdc
Vdc
3.45
4.54
0.15
0.3
115
5
30
A
A
A2-Sec.
A
mA
mA
mA, p-p
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (certified to the following
requirements)
Calculated MTBF
Vin = 48V, full load
Vin = min.
91
92
Input to output, continuous
Input to baseplate
Output to baseplate.
Basic
2250
1500
1500
92.5
93
%
%
Vdc
Vdc
Vdc
100
1500
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd edition
Per Telcordia SR-332, issue 1, class 3, ground
fixed, Tambient = +25°C
MΩ
pF
Yes
Hours x 103
TBD
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
180
190
70
70
200
80
80
KHz
mS
mS
60
120
μSec
±300
±400
mV
0
1
Vdc
3.5
13.5
Vdc
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
3% of Vout
same as above
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Base Plate
Case to Ground pin option
ON = Pin connected to -Vin or to external source
OFF = Pin open or connected to external voltage
source
Open collector/drain
ON = Pin open or connected to external voltage
source
OFF = Pin connected to -Vin or to external
voltage
Open collector/drain
"B" suffix
("3" Suffix)
1
mA
3.5
13.5
Vdc
0
1
Vdc
1
mA
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MDC_PAQ Series.A02 Page 3 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
FUNCTIONAL SPECIFICATIONS, (CONT.)
Conditions ➀ /Comments
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation ➄
Total Accuracy:
Line Regulation
Load Regulation
Ripple and Noise
Remote Sense
Temperature Coefficient
Maximum Capacitive Loading
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
98% of Vnom., after warmup
Minimum
Maximum
Units
149
150.49
W
29.502
-1
-20
29.8
38
30.098
1
10
40
Vdc
% of Vnom
% of Vnom.
Vdc
5
6.8
5
8.2
A
A
1.5
2
A
30.69
±0.1
±0.1
90
Vdc
% of Vout
% of Vout
mV pk-pk
%
% of Vout./°C
μF
0
5.5
Hiccup technique, autorecovery within 1.25%
of Vout
Output shorted to ground, no damage;
continuous
Current limiting
Over line, load (0-5A), and temp.
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
Typical/Nominal
0
28.906
40
10
±0.02
1
At all outputs
Low ESR, resistive load only
2200
MECHANICAL
Outline Dimensions (open frame)
(Please refer to outline drawing)
Outline Dimensions (with baseplate)
Weight
2.3 x 1.45 x 0.46
58.4 x 36.8 x 11.7
2.3 x 1.45 x 0.5
58.4 x 36.8 x 12.7
1.56
43.8
2.13
60.5
0.04 & 0.062
1.016 & 1.575
Copper alloy
50
5
Open frame
With baseblate
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
pins (1-4,6-8) & (5,9)
Nickel subplate
Gold overplate
Inches
mm
Inches
mm
Ounces
Grams
Ounces
Grams
Inches
mm
μ-inches
μ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Baseplate Temperature
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating
With Derating
No derating,
Vin = Zero (no power)
-40
-40
-55
115
125
85
100
125
130
°C
°C
°C
°C
External filter is required
Class B
RoHS-6
Notes
➀ Unless otherwise noted, all specifications apply at Vin = nominal, nominal output voltage and full
output load. General conditions are near sea level altitude, no base plate installed and natural convection airflow unless otherwise specified. All models are tested and specified with external parallel 1 μF and 10 μF output capacitors and a 22μf external input capacitor (see Technical Notes). All
capacitors are low-ESR types wired close to the converter. These capacitors are necessary for our
test equipment and may not be needed in the user’s application.
➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cin = 33 μF/100V, Cbus = 220μF/100V and Lbus = 12 μH.
➂ All models are stable and regulate to specification under no load.
➃ The Remote On/Off Control is referred to -Vin.
➄ Regulation specifications describe the output voltage changes as the line voltage or load current
is varied from its nominal or midpoint value to either extreme. The load step is ±25% of full load
current.
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MDC_PAQ Series.A02 Page 4 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
PERFORMANCE DATA
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
95
14
12
Power Dissipation (Watts)
Efficiency (%)
90
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
85
80
8
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
6
4
2
75
70
0.5
10
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
1
1.5
2
12.5
3
3.5
4
4.5
5
Output Load Curre nt (Amps)
5
Load Curre nt (Amps)
Vout
Output Current Limit vs. Output Voltage (at various input line voltages)
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
VIN = 75V
VIN = 36V
VIN = 60V
VIN = 48V
5 5.1 5.3 5.4 5.6 5.7 5.9 6.0 6.2 6.3 6.5 6.6 6.7 6.9 7.0 7.2 7.3 7.5 7.6 7.8 7.9
Amps
Output Power Derating in Conduction Cooling (Cold Baseplate) Applications
(Vin = 36-75V, Ambient Temperature = 85°C) See technical notes section, figure 8.
Output Load Current (Amps)
6
5
Ta= 85°C
4
3
2
1
0
45
50
55
60
70
75
80
85
90
95
100
105
Baseplate Temperature (°C)
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MDC_PAQ Series.A02 Page 5 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
PERFORMANCE DATA
Maximum Current Temperature Derating at sea level
(Vin = 36V, airflow from pin 1 to pin 4, with baseplate)
6
6
5
5
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 36V, airflow from pin 1 to pin 4, without baseplate)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
4
3
2
1
0
0.3 m/s (60 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM),
1.5 m/s (300 LFM),
2.0 m/s (400 LFM)
4
3
2
1
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
Ambient Temperature (°C)
5
5
Output Current (Amps)
Output Current (Amps)
6
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2
1
0
3
70
75
80
85
80
85
80
85
2
1
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
5
5
Output Current (Amps)
6
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
3
55
60
65
70
75
Maximum Current Temperature Derating at sea level
(Vin = 60V, airflow from pin 1 to pin 4, with baseplate)
6
4
50
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 60V, airflow from pin 1 to pin 4, without baseplate)
Output Current (Amps)
65
0.3 m/s (60 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM),
1.5 m/s (300 LFM),
2.0 m/s (400 LFM)
4
Ambient Temperature (°C)
2
1
0
60
Maximum Current Temperature Derating at sea level
(Vin = 48V, airflow from pin 1 to pin 4, with baseplate)
6
3
55
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 48V, airflow from pin 1 to pin 4, without baseplate)
4
50
4
0.3 m/s (60 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM),
1.5 m/s (300 LFM),
2.0 m/s (400 LFM)
3
2
1
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
0
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_PAQ Series.A02 Page 6 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
PERFORMANCE DATA
Start up Delay (Vin = 48V, Vout = nom, Iout = 5A, Co = 2200μf, Ta = +25°C)
Ch1 = Vin, Ch2 = Vout
Enable Start up Delay (Vin = 48V, Vout = nom, Iout = 5A, Co = 2200μf, Ta = +25°C)
Ch1 = Enable, Ch2 = Vout
Step load Transient Response (Vin = 48V, Vout = nom, Cload = 10μf || 1μf,
Iout = 50-75-50% of full load (2A/div) , Ta = +25°C) Ch2 = Vout, Ch4 = Iout
Output Ripple and Noise (Vin = 48V, Iout = 0A, Cload = 1μf||10μf, Ta = +25°C)
Output Ripple and Noise (Vin = 48V, Iout = 5A, Cload = 1μf||10μf, Ta = +25°C)
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MDC_PAQ Series.A02 Page 7 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
MECHANICAL SPECIFICATIONS: OPEN FRAME
MATERIAL:
0.040 PI
NS: COPPER ALLOY
0.060 PINS: COPPER ALLOY
FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
TOP VIEW
4.8
.19
(NOTE 1)
0.25
.010 MIN BETWEEN
MTG PLANE AND
COMPONENTS
END
VIEW
47.24
1.860
11.7
0.46
58.4
2.30
36.8
1.45
1° MAX
(ALL PINS)
13.08
0.515
CL
26.16
1.030
23.62
0.930
END
VIEW
2x
CL
0.177
Mtg Plane
SIDE VIEW
1.02±0.05
0.040±0.002
@ PINS 1,2,4, 6-8
AND 3 WHEN SPECIFIED
25.4
1.00
CL
50.80
2.000
3.81
0.150
4
15.24
0.600
7.62
0.300
5
6
7
8
9
2
1
1. ALTERNATE PIN LENGTHS AVAILABLE
(SEE PART NUMBER STRUCTURE)
2. COMPONENTS SHOWN FOR REF ONLY
3. DIMENSIONS ARE IN INCHES [mm]
4. PIN LOCATION DIMENSIONS APPLY AT
CIRCUIT BOARD LEVEL
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
1.57±0.05
0.062±0.002
@ PINS 5 & 9
CL
3.81
0.150
BOTTOM VIEW
INPUT/OUTPUT CONNECTIONS
Pin
Function
1
+ Vin
2
Remote On/Off *
3
No pin
4
- Vin
5
- Vout
6
- Sense
7
Trim
8
+ Sense
9
+ Vout
*The Remote On/Off can be provided
with either positive (P suffix) or
negative (N suffix) logic.
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MDC_PAQ Series.A02 Page 8 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
MECHANICAL SPECIFICATIONS: WITH BASEPLATE
MATERIAL:
0.040 PINS: COPPER ALLOY
0.060 PINS: COPPER ALLOY
FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
TOP VIEW
4.6
.18
(NOTE 1)
0.25
.010 MIN BETWEEN
MTG PLANE AND
COMPONENTS
END
VIEW
47.24
1.860
58.4
2.30
12.7
0.50
2x
5.08
0.200
36.8
1.45
1° MAX
(ALL PINS)
13.08
0.515
CL
26.16
1.030
23.62
0.930
END
VIEW
0.126±0.003
THRU
(NO THREADS)
2x
CL
Mtg Plane
SIDE VIEW
1.02±0.05
0.040±0.002
@ PINS 1,2,4, 6-8
AND 3 WHEN SPECIFIED
25.4
1.00
CL
50.80
2.000
3.81
0.150
4
15.24
0.600
5
3
7.62
0.300
6
7
8
9
2
1
1. ALTERNATE PIN LENGTHS AVAILABLE
(SEE PART NUMBER STRUCTURE)
2. COMPONENTS SHOWN FOR REF ONLY
3. DIMENSIONS ARE IN INCHES [mm]
4. PIN LOCATION DIMENSIONS APPLY AT
CIRCUIT BOARD LEVEL
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
1.57±0.05
0.062±0.002
@ PINS 5 & 9
CL
3.81
0.150
BOTTOM VIEW
INPUT/OUTPUT CONNECTIONS
Pin
Function
1
+ Vin
2
Remote On/Off *
3
Baseplate Gnd (Optional)
4
- Vin
5
- Vout
6
- Sense
7
Trim
8
+ Sense
9
+ Vout
*The Remote On/Off can be provided
with either positive (P suffix) or
negative (N suffix) logic.
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MDC_PAQ Series.A02 Page 9 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
MECHANICAL SPECIFICATIONS: RECOMMENDED FOOTPRINT (VIEW THROUGH CONVERTER)
TOP VIEW
FINISHED HOLE SIZES
@ PINS 1-4, 6-8
(PER IPC-D-275, LEVEL C)
23.62
.930
.048-.062
(PRI)
(SEC)
9
8
7
1
37.3
1.47
2
CL
3 (When Applicable)
4
3.81
.150
5.72 CLEARANCE FOR
2x .225 MOUNTING
STANDOFFS
MIN
47.24
1.860
25.4
1.00
2x
3.00 MOUNTING
HOLES
.118
3.81
.150
7.62
.300
7.62
.300
6
5
13.08
.515
CL
26.16
1.030
3.81
.150
FINISHED HOLE SIZES
@ PINS 5 & 9
(PER IPC-D-275, LEVEL C)
CL
.070-.084
50.80
2.000
58.9
2.32
IT IS RECOMMENDED THAT NO PARTS
BE PLACED BENEATH CONVERTER
(HATCHED AREA)
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
www.murata-ps.com/support
MDC_PAQ Series.A02 Page 10 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
STANDARD PACKAGING
9.92
(251.97)
REF
9.92
(251.97)
REF
Each static dissipative polyethylene
foam tray accommodates
15 converters in a 3 x 5 array.
0.88 (22.35)
REF
2.75 (69.85) ±.25
closed height
11.00 (279.4) ±.25
10.50 (266.7) ±.25
Carton accommodates two (2) trays yielding 30 converters per carton
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
www.murata-ps.com/support
MDC_PAQ Series.A02 Page 11 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the +Vin input
supply line.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout StartUp Delay (see Specifications) is the time interval between the point when the rising
input voltage crosses the Start-Up Threshold and the fully loaded regulated output
voltage enters and remains within its specified regulation band. Actual measured
times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to VOUT regulated assumes
that the converter already has its input voltage stabilized above the Start-Up
Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified regulation band.
The specification assumes that the output is fully loaded at maximum rated
current.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance. Since real-world
voltage sources have finite impedance, performance is improved by adding
external filter components. Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to totally characterize all applications, some experimentation may be needed. Note that external input capacitors must accept
high speed switching currents.
Because of the switching nature of DC/DC converters, the input of these
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation specifies that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (CIN in the figure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current ratings. In the figure below, the
CBUS and LBUS components simulate a typical DC voltage bus. Specific system
configurations may require additional considerations. Please note that the values of CIN, LBUS and CBUS may vary according to the specific converter model.
TO
OSCILLOSCOPE
CURRENT
PROBE
+Vin
VIN
+
–
+
–
LBUS
CBUS
CIN
−Vin
CIN = 33μF, ESR < 200mΩ @ 100kHz
CBUS = 220μF, 100V
LBUS = 12μH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple and noise (also referred to as periodic and
random deviations or PARD) may be reduced by adding filter elements such
as multiple external capacitors. Be sure to calculate component temperature
rise from reflected AC current dissipated inside capacitor ESR. In figure 3, the
two copper strips simulate real-world printed circuit impedances between the
power supply and its load. In order to minimize circuit errors and standardize
tests between units, scope measurements should be made using BNC connectors or the probe ground should not exceed one half inch and soldered directly
to the fixture.
+Vout
C1
C2
SCOPE
RLOAD
−Vout
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
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MDC_PAQ Series.A02 Page 12 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Specifications).
These leakages consist of both an AC stray capacitance coupling component
and a DC leakage resistance. When using the isolation feature, do not allow
the isolation voltage to exceed specifications. Otherwise the converter may
be damaged. Designers will normally use the negative output (-Output) as
the ground return of the load circuit. You can however use the positive output
(+Output) as the ground return to effectively reverse the output polarity.
Minimum Output Loading Requirements
These converters employ a synchronous rectifier design topology. All models
regulate within specification and are stable under no load to full load conditions.
Operation under no load might however slightly increase output ripple and noise.
Thermal Shutdown
To protect against thermal over-stress, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/
DC’s to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit.
When the temperature decreases below the turn-on threshold, the converter
will automatically restart. There is a small amount of hysteresis to prevent
rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the
converter may shut down suddenly without warning. Be sure to thoroughly test
your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature
and decreasing maximum output current which is acceptable under increasing
forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are
AVERAGE measurements. The converter will accept brief increases in temperature
and/or current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter itself
which is obviously running at higher temperature than the outside air. Also note
that “natural convection” is defined as very low flow rates which are not using
fan-forced airflow. Depending on the application, “natural convection” is usually about 30-65 LFM but is not equal to still air (0 LFM).
Output Overvoltage Protection (OVP)
This converter monitors its output voltage for an over-voltage condition using
an on-board electronic comparator. If the output exceeds OVP limits, the sensing circuit will power down the unit, and the output voltage will decrease. After
a time-out period, the PWM will automatically attempt to restart, causing the
output voltage to ramp up to its rated value. It is not necessary to power down
and reset the converter for this automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive levels,
the OVP circuitry will initiate another shutdown cycle. This on/off cycling is
referred to as “hiccup” mode.
Current Limiting (Power limit with current mode control)
As power demand increases on the output and enters the specified “limit
inception range” limiting circuitry activates in the DC-DC converter to limit/
restrict the maximum current or total power available. Once the current
reaches a certain range the output voltage will start to decrease while the
output current continues to increase, thereby maintaining constant power, until
a minimum voltage set is reached and the converter enters a “hiccup” (on off
cycling) mode of operation until the load is reduced below the threshold level,
whereupon it will return to a normal mode of operation. Current limit inception
is defined as the point where the output voltage has decreased by a pre-specified percentage (usually a 2% decrease from nominal).
Short Circuit Condition (Current mode control)
The short circuit condition is an extension of the “Current Limiting” condition.
When the monitored peak current signal reaches a certain range, the PWM
controller’s outputs are shut off thereby turning the converter “off.” This is
followed by an extended time out period. This period can vary depending on
other conditions such as the input voltage level. Following this time out period,
the PWM controller will attempt to re-start the converter by initiating a “normal
start cycle” which includes softstart. If the “fault condition” persists, another
“hiccup” cycle is initiated. This “cycle” can and will continue indefinitely until
such time as the “fault condition” is removed, at which time the converter will
resume “normal operation.” Operating in the “hiccup” mode during a fault
condition is advantageous in that average input and output power levels are
held low preventing excessive internal increases in temperature.
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. Both thermocouples and an infrared
camera system are used to observe thermal performance. Sometimes it is
possible to estimate the effective airflow if you thoroughly understand the
enclosure geometry, entry/exit orifice areas and the fan flowrate specifications.
Trimming Output Voltage
PAQ converters have a trim capability that enables users to adjust the output
voltage from +10% to –20% (refer to the trim equations). Adjustments to the
output voltage can be accomplished with a single fixed resistor as shown in
Figures 4 and 5. A single fixed resistor can increase or decrease the output
voltage depending on its connection. Resistors should be located close to
the converter and have TCR’s less than 100ppm/°C to minimize sensitivity
to changes in temperature. If the trim function is not used, leave the trim pin
open.
CAUTION: If these Derating guidelines are exceeded, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Standard PAQ’s have a “positive trim” where a single resistor connected from
the Trim pin to the +Sense will increase the output voltage. A resistor connected from the Trim Pin to the –Sense will decrease the output voltage.
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MDC_PAQ Series.A02 Page 13 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
Trim adjustments greater than the specified +10%/–20% can have an adverse
affect on the converter’s performance and are not recommended. Excessive
voltage differences between VOUT and Sense, in conjunction with trim adjustment of the output voltage, can cause the overvoltage protection circuitry to
activate (see Performance Specifications for overvoltage limits).
Temperature/power derating is based on maximum output current and voltage
at the converter’s output pins. Use of the trim and sense functions can cause
output voltages to increase, thereby increasing output power beyond the PAQ’s
specified rating, or cause output voltages to climb into the output overvoltage
region. Therefore:
(VOUT at pins) x (IOUT) d rated output power
+Vin
+Vout
+SENSE
ON/OFF
CONTROL
TRIM
LOAD
RTRIM DOWN
–SENSE
–Vin
–Vout
Figure 5. Trim Connections To Decrease Output Voltages Using Fixed Resistors
The Trim pin (pin 6) is a relatively high impedance node that can be susceptible
to noise pickup when connected to long conductors in noisy environments.
Trim Equations
Trim Down
Connect trim resistor between
trim pin and −Sense
RTrimDn (k Ω) = 5.11 − 10.22
'
Remote Sense Input
Use the Sense inputs with caution. Sense is normally connected at the load.
Sense inputs compensate for output voltage inaccuracy delivered at the load.
This is done by correcting IR voltage drops along the output wiring and the
current carrying capacity of PC board etch. This output drop (the difference
between Sense and Vout when measured at the converter) should not exceed
0.5V. Consider using heavier wire if this drop is excessive. Sense inputs also
improve the stability of the converter and load system by optimizing the control
loop phase margin.
Note: The Sense input and power Vout lines are internally connected through
low value resistors to their respective polarities so that the converter can
operate without external connection to the Sense. Nevertheless, if the Sense
function is not used for remote regulation, the user should connect +Sense to
+Vout and –Sense to –Vout at the converter pins.
Trim Up
Connect trim resistor between
trim pin and +Sense
RTrimUp (k Ω) = 5.11 × VNOM × (1+' − 5.11 − 10.22
'
1.225 × '
The remote Sense lines carry very little current. They are also capacitively
coupled to the output lines and therefore are in the feedback control loop to
regulate and stabilize the output. As such, they are not low impedance inputs
and must be treated with care in PC board layouts. Sense lines on the PCB
should run adjacent to DC signals, preferably Ground. In cables and discrete
wiring, use twisted pair, shielded tubing or similar techniques.
Where,
' _VNOM − VOUT) / VNOM _
VNOM is the nominal, untrimmed output voltage.
VOUT is the desired new output voltage.
Do not exceed the specified trim range or maximum power ratings when
adjusting trim. Use 1% precision resistors mounted close to the converter
on short leads.
Any long, distributed wiring and/or significant inductance introduced into the
Sense control loop can adversely affect overall system stability. If in doubt, test
Contact and PCB resistance
losses due to IR drops
+Vin
+Vout
+Vin
+Vout
I OUT
+SENSE
ON/OFF
CONTROL
+SENSE
Sense Current
TRIM
LOAD
RTRIM UP
–SENSE
–Vin
ON/OFF
CONTROL
TRIM
LOAD
Sense Return
−SENSE
–Vout
I OUT Return
Figure 4. Trim Connections To Increase Output Voltages Using Fixed Resistors
–Vin
-Vout
Contact and PCB resistance
losses due to IR drops
Figure 6. Remote Sense Circuit Configuration
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MDC_PAQ Series.A02 Page 14 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
your applications by observing the converter’s output transient response during
step loads. There should not be any appreciable ringing or oscillation. You
may also adjust the output trim slightly to compensate for voltage loss in any
external filter elements. Do not exceed maximum power ratings.
+VCC
Please observe Sense inputs tolerance to avoid improper operation:
ON/OFF
CONTROL
[Vout(+) −Vout(-)] − [Sense(+) −Sense(-)] ≤ 10% of Vout
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore excessive voltage differences between Vout and Sense
together with trim adjustment of the output can cause the overvoltage protection circuit to activate and shut down the output.
-Vin
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage. Therefore the designer must
ensure:
Figure 7. Driving the On/Off Control Pin (suggested circuit)
(Vout at pins) x (Iout) ≤ (Max. rated output power)
Cold Wall Cooling Test Method (cold baseplate applications)
Remote On/Off Control
On the input side, a remote On/Off Control can be specified with either positive
or negative logic as follows:
Murata Power Solutions’ cold wall cooling test is implemented with the
baseplate of the UUT (unit under test) mounted to the large aluminum block
(see figure 8). Thermocouples are attached to the known hot spots on the UUT
as well as the aluminum block and still air space. The environment chamber
regulates the aluminum block and baseplate temperature at a fixed value up
to 100°C. The still air chamber is manually regulated to 85°C by the attached
heaters. Output load is applied to the UUT and it is monitored to ensure safe
operating limits at all input voltages.
Models are on (enabled) when the On/Off is grounded or brought to within
a low voltage (see Specifications) with respect to –VIN. The device is off
(disabled) when the On/Off is left open or is pulled high to +13.5VDC Max. with
respect to –VIN.
Dynamic control of the On/Off function should be able to sink the specified
signal current when brought low and withstand specified voltage when brought
high. Be aware too that there is a finite time in milliseconds (see Specifications)
between the time of On/Off Control activation and stable, regulated output. This
time will vary slightly with output load type and current and input conditions.
There are two CAUTIONs for the On/Off Control:
Thermal insulation
Still air chamber
thermocouple
Still air chamber
Unit under test
Still air chamber
heater
Environment
chamber
Still air chamber
heater
CAUTION: While it is possible to control the On/Off with external logic if you
carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor or a relay (which can thereupon be controlled
by logic). The On/Off prefers to be set at approx. +13.5V (open pin) for the ON
state, assuming positive logic.
Thermocouple
Aluminum block
CAUTION: Do not apply voltages to the On/Off pin when there is no input power
voltage. Otherwise the converter may be permanently damaged.
Figure 8. Cold Wall Test Fixture Equipment
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MDC_PAQ Series.A02 Page 15 of 16
PAQ Series
Up to 150W 29.8V Nom Output Quarter-Brick Isolated
DC-DC Converter with 2:1 Wide Input Range
Vertical Wind Tunnel
IR Transparent
optical window
Variable
speed fan
Unit under
test (UUT)
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airflow and heat dissipation analysis of power products.
The system includes a precision low flow-rate anemometer,
variable speed fan, power supply input and load controls,
temperature gauges, and adjustable heating element.
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
IR Video
Camera
Heating
element
Precision
low-rate
anemometer
3” below UUT
Both through-hole and surface mount converters are soldered down to a 10" by 10" host carrier board for realistic
heat absorption and spreading. Both longitudinal and transverse airflow studies are possible by rotation of this carrier
board since there are often significant differences in the heat
dissipation in the two airflow directions. The combination of
adjustable airflow, adjustable ambient heat, and adjustable
Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
The collimator reduces the amount of turbulence adjacent to
the UUT by minimizing airflow turbulence. Such turbulence
influences the effective heat transfer characteristics and
gives false readings. Excess turbulence removes more heat
from some surfaces and less heat from others, possibly
causing uneven overheating.
Ambient
temperature
sensor
Airflow
collimator
Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating element and
fan, built-in temperature gauges, and no-contact IR camera mean
that power supplies are tested in real-world conditions.
Figure 9. Vertical Wind Tunnel
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
For Sn/Pb based solders:
Maximum Preheat Temperature
115° C.
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2013 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_PAQ Series.A02 Page 16 of 16