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date
11/10/2022
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1 of 8
SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
FEATURES
•
•
•
•
•
•
•
•
•
•
up to 50 W isolated output
2:1 input range (18~36 Vdc, 36~75 Vdc)
single, regulated output
1,500 Vdc isolation
short circuit, over current, input under voltage protection
inverse polarity protection
remote on/off
operating temperature range (-40~85°C)
six sided metal shielding
efficiency up to 91%
MODEL
input
voltage
output
voltage
output
current
output
power
ripple
and noise1
efficiency
typ
(Vdc)
range
(Vdc)
(Vdc)
min
(mA)
max
(A)
max
(W)
max
(mVp-p)
typ
(%)
PQA50-D24-S3-T2
24
18~36
3.3
500
10
33
150
89
PQA50-D24-S5-T
24
18~36
5
500
10
50
150
91
PQA50-D24-S12-T2
24
18~36
12
208
4.167
50
150
91
PQA50-D24-S15-T
2
24
18~36
15
167
3.333
50
150
91
PQA50-D24-S24-T2
24
18~36
24
104
2.083
50
150
91
PQA50-D48-S3-T
48
36~75
3.3
500
10
33
150
89
PQA50-D48-S5-T
48
36~75
5
500
10
50
150
91
PQA50-D48-S12-T
48
36~75
12
208
4.167
50
150
91
PQA50-D48-S15-T
48
36~75
15
167
3.333
50
150
91
PQA50-D48-S24-T
48
36~75
24
104
2.083
50
150
91
2
Notes:
1. Ripple and noise are measured at 20 MHz BW by "parallel cable" method with 1 μF ceramic and 10 μF electrolytic capacitors on the output.
2. Model is not CE certified.
PART NUMBER KEY
PQA50 - DXX - SXX - TX
Base Number
Input Voltage
Output Voltage
Notes:
*Discontinued heatsink versions.
cui.com
Mounting Type
T = Chassis Mount
Heatsink*
"blank" = no heatsink
H = with heatsink
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CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
date 11/10/2022 │ page 2 of 8
INPUT
parameter
conditions/description
min
typ
max
units
operating input voltage
24 Vdc input models
48 Vdc input models
18
36
24
48
36
75
Vdc
Vdc
input under voltage protection
24 Vdc input models
48 Vdc input models
18
36
start-up voltage
under/over voltage shutdown
Vdc
Vdc
input over voltage protection
24 Vdc input models
48 Vdc input models
36
75
Vdc
Vdc
input under voltage protection
24 Vdc input models
48 Vdc input models
16
32
Vdc
Vdc
input over voltage protection
24 Vdc input models
48 Vdc input models
surge voltage
for maximum of 1 second
24 Vdc input models
48 Vdc input models
start-up time
nominal input, constant load
40
81
Vdc
Vdc
-0.7
-0.7
50
100
Vdc
Vdc
10
ms
6
mA
models ON (CTRL open or connect TTL high level, 3~12 Vdc)
CTRL1
models OFF (CTRL connect GND or low level, 0~1.2 Vdc)
input current (models OFF)
filter
pi filter
Note 1. CTRL pin voltage is referenced to GND.
OUTPUT
parameter
conditions/description
typ
max
units
line regulation
full load, input voltage from low to high
min
±0.2
±0.5
%
load regulation
10% to 100% load
±0.5
±1
%
±1
±3
%
voltage accuracy
adjustability
±10
%
switching frequency
PWM mode
320
kHz
transient recovery time
25% load step change
300
500
μs
transient response deviation
25% load step change
±3
±5
%
temperature coefficient
100% load
±0.02
%/°C
PROTECTIONS
parameter
conditions/description
over voltage protection2
3.3 Vdc output models
5 Vdc output models
12 Vdc output models
15 Vdc output models
24 Vdc output models
min
over current protection
short circuit protection
max
units
3.9
6.2
15
18
30
Vdc
Vdc
Vdc
Vdc
Vdc
135
%
110
°C
continuous, automatic recovery, hiccup
over temperature protection
Note
typ
2. Module needs to be re-started after over voltage protection.
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CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
date 11/10/2022 │ page 3 of 8
SAFETY AND COMPLIANCE
parameter
conditions/description
isolation voltage
input to output at 1 mA for 1 minute
1,500
min
typ
isolation resistance
input to output at 500 Vdc
1,000
isolation capacitance
input to output at 100 kHz, 0.1 Vdc
safety approvals
certified to 60950: EN
conducted emissions
CISPR22/EN55022 class B (external circuit required, see figure 1)
radiated emissions
CISPR22/EN55022 class B (external circuit required, see figure 1)
ESD
IEC/EN61000-4-2 class B, contact ± 4kV
radiated immunity
IEC/EN61000-4-3 class A, 10V/m
EFT/burst
IEC/EN61000-4-4 class B, ± 2kV (external circuit required, see figure 1)
surge
IEC/EN61000-4-5 class B, ± 2kV (external circuit required, see figure 1)
conducted immunity
IEC/EN61000-4-6 class A, 3 Vr.m.s
voltage dips & interruptions
IEC/EN61000-4-29 class B, 0%-70%
MTBF
as per MIL-HDBK-217F @ 25°C
RoHS
2011/65/EU
max
units
Vdc
MΩ
2,000
pF
1,000,000
hours
ENVIRONMENTAL
parameter
conditions/description
min
operating temperature
see derating curve
storage temperature
storage humidity
non-condensing
case temperature
at full load, operating temperature curve range
vibration
10~55 Hz, 30 min. along x, y, and z
typ
max
units
-40
85
°C
-55
125
°C
5
95
%
105
°C
10
G
max
units
MECHANICAL
parameter
conditions/description
min
dimensions
chassis mount: 76.0 x 31.5 x 21.2
chassis mount with heatsink: 76.0 x 31.5 x 25.1
case material
aluminum alloy
weight
chassis mount
chassis mount with heatsink
typ
mm
mm
57
65
cui.com
g
g
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CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
date 11/10/2022 │ page 4 of 8
MECHANICAL DRAWING
CHASSIS MOUNT
units: mm[inch]
tolerance: ±0.50[±0.020]
wire range: 24~12 AWG
PIN CONNECTIONS
PIN
Function
1
CTRL
2
GND
3
Vin
4
Trim
5
0V
6
+Vo
Top View
Front View
CHASSIS MOUNT WITH HEATSINK
units: mm[inch]
tolerance: ±0.50[±0.020]
wire range: 24~12 AWG
PIN CONNECTIONS
PIN
Function
1
CTRL
2
GND
3
Vin
4
Trim
5
0V
6
+Vo
Top View
Front View
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CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
date 11/10/2022 │ page 5 of 8
DERATING CURVES
EMC RECOMMENDED CIRCUIT
Figure 1
Table 1
Recommended external circuit components
Vin (Vdc)
24
48
C0
330μF/50V
330μF/100V
CY1, CY2
1nF/2kV
1nF/2kV
LCM
2.2mH
2.2mH
Note:
1. See Table 3 for Cout values.
TEST CONFIGURATION
Figure 2
Table 2
External components
Note:
Lin
4.7μH
Cin
220μF, ESR < 1.0Ω
at 100 kHz
1. Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.
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CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
date 11/10/2022 │ page 6 of 8
APPLICATION NOTES
1. Requirement on output load
To ensure this module can operate efficiently and reliably, the minimum output load cannot be less than 5% of the full load during
operation. If the actual output power is small, please connect a resistor at the output end in parallel to increase the load.
2. 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 3). If you want to further decrease the input/output ripple, you can increase capacitance properly or
choose capacitors with low ESR (see table 3). However, the capacitance must not exceed the maximum capacitive load or a start-up
problem might arise (see table 4).
Figure 3
Table 3
Table 4
Vout
(Vdc)
Cin
(µF)
Cout
(µF)
3.3
100
220
5
100
220
12
100
100
15
100
100
24
100
47
Vout
(Vdc)
Max.
Capacitive Load
(μF)
3.3
27000
5
18900
12
3700
15
2000
24
1000
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CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER
date 11/10/2022 │ page 7 of 8
APPLICATION NOTES (CONTINUED)
1. Output Voltage Trimming
Leave open if not used.
Figure 4
Table 5
VOUT
RTOP
RBOTTOM
RO
VREF
(Vdc)
(kΩ)
(kΩ)
(kΩ)
(V)
3.3
4.788
2.87
15
1.24
5
2.87
2.87
12.1
2.5
12
11
2.87
22
2.5
15
15
3
22
2.5
24
20
2.308
15
2.5
Note:
Value for RTOP, RBOTTOM, RO, and VREF refer to Table 3 (fixed internal values).
RTRIM: Trim resistance
a: User-defined parameter, no actual meanings
VOUT: Nominal output voltage
Notes:
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
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