1. ripple and noise are measured at 20 MHz BW by “parallel cable” method
PART NUMBER KEY
PQM3 - DXX - SXX - M -
X
Base Number
Input Voltage
Output Voltage
Packaging Style
SMT
Package Options
"blank" = standard
TR = Tape & Reel
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CUI Inc
│
SERIES:
PQM3-M
│
DESCRIPTION:
DC-DC CONVERTER
date
03/19/2013
│
page
2 of 6
INPUT
parameter
operating input voltage
conditions/description
12 V input models
24 V input models
48 V input models
12 V input models
24 V input models
48 V input models
for maximum of 1 second
12 V input models
24 V input models
48 V input models
pi filter
min
9
18
36
4.5
11
24
-0.7
-0.7
-0.7
typ
12
24
48
8
16
33
max
18
36
75
9
18
36
25
50
100
units
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
start-up voltage
surge voltage
filter
OUTPUT
parameter
line regulation
load regulation
voltage accuracy
no-load output voltage accuracy
switching frequency
transient recovery time
transient response deviation
temperature coeffecient
conditions/description
full load, input voltage from low to high
5% to 100% load
5% to 100% load
5V models
all other models
100% load, nominal input voltage
25% load step change
25% load step change
100% load
min
typ
±0.2
±0.2
±1
±1.5
±1.5
350
0.5
±2
±0.02
1
±5
±0.03
max
±0.4
±0.75
±3
±5
±3
units
%
%
%
%
%
KHz
ms
%
%/°C
PROTECTIONS
parameter
short circuit protection
over current protection
conditions/description
continuous, automatic recovery
120
%
min
typ
max
units
SAFETY AND COMPLIANCE
parameter
isolation voltage
isolation resistance
conducted emissions
ESD
radiated immunity
EFT/burst
surge
conducted immunity
voltage dips & interruptions
MTBF
RoHS compliant
conditions/description
for 1 minute at 1 mA max.
at 500 Vdc
IEC/EN61000-4-2, class B, contact ± 4kV/ air ± 8kV
IEC/EN61000-4-3, class A, 10V/m
IEC/EN61000-4-4, class B, ± 2kV (external circuit required, see Figure 1-a)
IEC/EN61000-4-5, class B, ± 2kV (external circuit required, see Figure 1-a)
IEC/EN61000-4-6, class A, 3 Vr.m.s
IEC/EN61000-4-29, class B, 0%-70%
as per MIL-HDBK-217F @ 25°C
yes
1,000,000
hours
min
1,500
1,000
typ
max
units
Vdc
MΩ
CISPR22/EN55022, class B (external circuit required, see Figure 1-b)
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CUI Inc
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SERIES:
PQM3-M
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DESCRIPTION:
DC-DC CONVERTER
date
03/19/2013
│
page
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ENVIRONMENTAL
parameter
operating temperature
storage temperature
storage humidity
temperature rise
non-condensing
at full load, Ta=25°C
25
conditions/description
see derating curve
min
-40
-55
typ
max
105
125
95
units
°C
°C
%
°C
SOLDERABILITY
parameter
hand soldering
reflow soldering
conditions/description
1.5 mm from case for 10 seconds
see reflow soldering profile
min
typ
max
300
245
units
°C
°C
MECHANICAL
parameter
dimensions
case material
weight
conditions/description
23.86 x 13.70 x 8.00 (0.939 x 0.539 x 0.315 inch)
epoxy resin (UL94-V0)
5.2
g
min
typ
max
units
mm
MECHANICAL DRAWING
units: mm[inch]
tolerance: ±0.25[±0.010]
pin section tolerance: ±0.10[±0.004]
23.86[0.939]
3.04[0.120]
15.24[0.600]
2.54[0.100]
13.70[0.539]
18.10[0.713]
16
10 9
A
A
18.10 [0.713]
Side View
0.25[0.010]
1
Top View
7
8
5 max
1.40±0.20
[0.055±0.008]
7.50
[0.295]
8.00
[0.315]
PIN CONNECTIONS
PIN
1
7
8
9
2.10 [0.083]
1.02[0.040]
Front View
0.50[0.020]
Function
GND
NC
NC
+Vo
0V
Vin
16
17.20 [0.677]
10 9
Grid Size:
2.54mm x 2.54mm
10
16
1
7
8
PCB Layout
Top View
1.00[0.039]
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SERIES:
PQM3-M
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DESCRIPTION:
DC-DC CONVERTER
date
03/19/2013
│
page
4 of 6
DERATING CURVES
Reflow Soldering Profile
25 0
24 5
21 7
20 0
Temperature Derating Curve
Peak .Temp 245
˚C
( Max.)
Tem peratur e (
˚C
)
60 Sec Max
( >217
˚C
)
100
80
60
40
20
15 0
Load (%)
10 0
Safe operating area
50
0
Tim e (se c.)
-40
-20
0
20
40
60
85
105
120
Ambient Temperature (°C)
EMC RECOMMENDED CIRCUIT
FUSE
LDM1
+
MO V
-INPUT
TVS
C0
C1
C2
LDM2
C3
VIN
+Vo
+INPUT
Figure 1
EUT
G ND
0V
LO AD
(a)
(b)
C4
Recommended external circuit components
Vin (Vdc)
FUSE
MOV
LDM1
TVS
C0
LDM2
C1
C2
C3
C4
12
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
24
10D560
56μH
SMCJ48A
120μF/50V
12μH
475K/50V
475K/50V
--
--
48
10D101
56μH
SMCJ90A
120μF/100V
12μH
475K/100V
475K/100V
--
--
choose according to practical input current
TEST CONFIGURATION
Oscilloscope
Lin
Cin
Current
Probe
External components
DC DC
Load
Lin
Cin
4.7μH
220μF, ESR < 1.0Ω
at 100 KHz
Note: Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.
Lin(4.7µH)
Cin(220µF, ESR < 1.0Ω at 100 KHz)
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CUI Inc
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SERIES:
PQM3-M
│
DESCRIPTION:
DC-DC CONVERTER
date
03/19/2013
│
page
5 of 6
APPLICATION NOTES
1.
Output load requirement
To ensure this module can operate efficiently and reliably, the minimum output load may not be less than 5% of the full load during
operation. If the actual output power is low, connect a resistor at the output end in parallel to increase the load.
Recommended circuit
This series has been tested according to the following recommended testing circuit before leaving the factory. This series should be
tested under load (see Figure 2). If you want to further decrease the input/output ripple, you can increase the capacitance accordingly
or choose capacitors with low ESR. However, the capacitance of the output filter capacitor must be appropriate. If the capacitance is
too high, a startup problem might arise. For every channel of the output, to ensure safe and reliable operation, the maximum capaci-
tance must be less than the maximum capacitive load (see Table 1).
Vin
+Vo
C in
2.
Figure 2
GND
DC
DC
Co ut
0V
Vin
(Vdc)
Table 1
12
24
48
Cin
(µF)
100
10~47
10~47
Cout
(µF/mA)
10/100
10/100
10/100
3.
Input Current
When it is used in an unregulated condition, make sure that the input fluctuations and ripple voltage do not exceed the module stan-
dard. Refer to Figure 3 for the startup current of this dc-dc module.
Input Current(A)
Ip
Vin
(Vdc)
12
24
Input Voltage
Range
Ip
(mA)
600
300
150
Figure 3
48
Input Voltage (V)
Note:
1. Minimum load shouldn't be less than 5%, otherwise ripple may increase dramatically. Operation under minimum load will not damage the converter, however, they may
not meet all specifications listed.
2. Maximum capacitive load is tested at input voltage range and full load.
3. All specifications are measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.
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