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date
09/12/2023
page
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SERIES: PXO78-500-M │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
FEATURES
•
•
•
•
•
•
•
ultra-thin SMD package
open frame
efficiency up to 95%
no-load input current as low as 0.2 mA
-40°C ~ 85°C temperature range
designed to meet EN/UKCA 62368
output short circuit protection
MODEL
input
voltage1
output
voltage
output
current
output
power
ripple
& noise2
efficiency3
typ
(Vdc)
range
(Vdc)
(Vdc)
max
(mA)
max
(W)
max
(mVp-p)
typ
(%)
PXO7803-500-M-TR
24
4.75~36
3.3
500
1.65
100
85
PXO7805-500-M-TR
24
6.5~36
5
500
2.5
100
90
PXO7806-500-M-TR
24
8~36
6.5
500
3.25
100
91
PXO7809-500-M-TR
24
12~36
9
500
4.5
100
93
PXO7812-500-M-TR
24
15~36
12
500
6.0
100
94
PXO7815-500-M-TR
24
19~36
15
500
7.5
100
95
Notes:
1. For input voltages higher than 30 Vdc, a 22 µF / 50 V input capacitor is required.
2. Tested at nominal input, 30~100% load for 3.3 Vdc model, 20 MHz bandwidth.
At loads below 30%, the max ripple and noise of the 3.3 Vdc output will be 200 mVp-p, and a load below 20% for the other outputs the levels increase to 250 mVp-p..
3. Measured at min Vin, full load.
4. All specifications are measured at Ta=25°C, humidity < 75%, nominal input voltage, and rated output load unless otherwise specified.
PART NUMBER KEY
PXO78 XX - 500 - M - TR
Base Number
Output Voltage
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Output Current
Packaging:
TR = Tape and Reel
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CUI Inc │ SERIES: PXO78-500-M │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 09/12/2023 │ page 2 of 6
INPUT
parameter
conditions/description
min
operating input voltage
typ
max
units
24
36
Vdc
5.0
0.2
8.0
1.5
mA
mA
typ
max
units
680
μF
input reverse polarity protection no
no-load input current
3.3 Vdc output model
all other output models
filter
capacitor filter
OUTPUT
parameter
conditions/description
min
maximum capacitive load
voltage accuracy
at full load, input voltage range
3.3 Vdc output model
all other models
±2
±2
±4
±3
%
%
line regulation
at full load, input voltage range
±0.3
±0.5
%
load regulation
at nominal input, 10~100% load
±0.6
±1
%
switching frequency
at nominal input voltage, full load
3.3 Vdc output model
all other output models
750
700
1,250
kHz
kHz
transient recovery time
at nominal input voltage, 25% load step change
0.2
1
ms
transient response deviation
at nominal input voltage, 25% load step change
±50
±250
temperature coefficient
at full load
±0.02
mV
%/°C
PROTECTIONS
parameter
conditions/description
short circuit protection
continuous, auto recovery
min
typ
max
units
min
typ
max
units
SAFETY AND COMPLIANCE
parameter
conditions/description
safety approvals
designed to meet 62368: EN/IEC/UKCA
conducted emissions5
CISPR32/EN55032 CLASS B (see Fig. 4-2 for recommended circuit)
radiated emissions
CISPR32/EN55032 CLASS B (see Fig. 4-2 for recommended circuit)
ESD
IEC/EN 61000-4-2 Contact ±4kV, perf. Criteria B
radiated immunity
IEC/EN 61000-4-3 10V/m, perf. Criteria B
EFT/burst
IEC/EN 61000-4-4 100kHz±1kV (see Fig. 4-1 for recommended circuit), perf. Criteria B
surge
IEC/EN 61000-4-5 ±1kV (see Fig. 4-1 for recommended circuit), perf. Criteria B
conducted immunity
IEC/EN 61000-4-6 3Vr.m.s, perf. Criteria B
MTBF
as per MIL-HDBK-217F, 25°C
RoHS
yes
5
Note:
2,000 000
3. CISPR22/EN55022, class A for the 3.3 Vdc output model.
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hours
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CUI Inc │ SERIES: PXO78-500-M │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 09/12/2023 │ page 3 of 6
ENVIRONMENTAL
parameter
conditions/description
min
max
units
operating temperature
see derating curve
-40
85
°C
-55
125
°C
5
95
%
max
units
260
°C
max
units
storage temperature
storage humidity
non-condensing
typ
SOLDERABILITY
parameter
conditions/description
min
reflow soldering
Peak temp. ≤245°C, maximum duration time ≤60s
over 217°C. Please refer to IPC/JEDEC J-STD-020D.1
typ
MECHANICAL
parameter
conditions/description
dimensions
12 x 12 x 4.5 [0.472 x 0.472 x 0.177 inch]
min
weight
cooling method
typ
mm
0.75
g
natural convection
MECHANICAL DRAWING
units: mm [inch]
tolerance: ±0.25[±0.010]
PIN-OUT
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PIN
FUNCTION
1
+Vin
2
NC
3
+Vo
4
GND
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CUI Inc │ SERIES: PXO78-500-M │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
DERATING CURVE
Figure 1
EFFICIENCY CURVES
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date 09/12/2023 │ page 4 of 6
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CUI Inc │ SERIES: PXO78-500-M │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 09/12/2023 │ page 5 of 6
TYPICAL APPLICATION CIRCUIT
Figure 2
Table 1
External Capacitor Table
Model Number
Note:
1.
2.
3.
4.
C1
C2
(ceramic capacitor) (ceramic capacitor)
PXO7803-500-M-TR
10 μF/50 V
22 μF/10 V
PXO7805-500-M-TR
10 μF/50 V
22 μF/10 V
PXO7806-500-M-TR
10 μF/50 V
22 μF/16 V
PXO7809-500-M-TR
10 μF/50 V
22 μF/16 V
PXO7812-500-M-TR
10 μF/50 V
22 μF/25 V
PXO7815-500-M-TR
10 μF/50 V
22 μF/25 V
The required C1 and C2 capacitors must be connected as close as possible to the terminals of the module.
Refer to Table 1 for C1 and C2 capacitor values. For certain applications, increased values and/or tantalum or low ESR electrolytic capacitors may also be used instead.
Converter cannot be used for hot swap or with output in parallel.
To further reduce the output ripple and noise, we suggested the use of a “LC” filter at the output terminals, with an inductor value (L) of 10µH-47µH.
Figure 3
External “LC” output filter circuit diagram
EMC RECOMMENDED CIRCUIT
Figure 4
Table 2
Recommended external circuit components
Note:
FUSE
choose according to actual input current
MOV
S20K30
LDM1
82 µH
C0
680 µF/50 V
C1 / C2
see Table 1
C5
4.7 µF/50 V
LDM2
22 µH
For EMC tests we use Part ① in Fig. 4 for immunity and part ➁ for emissions test. Selecting based on needs.
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CUI Inc │ SERIES: PXO78-500-M │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 09/12/2023 │ page 6 of 6
REVISION HISTORY
rev.
description
date
1.0
initial release
08/30/2022
1.01
switching frequency, no load input current, ripple & noise, and
emissions updated for 3.3 Vdc output model
05/23/2023
efficiency curves updated
09/12/2023
1.02
The revision history provided is for informational purposes only and is believed to be accurate.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a
life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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