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03/30/2023
page
1 of 7
SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
FEATURES
•
•
•
•
•
•
•
•
•
•
wide input
pin-out compatible with linear regulators
encapsulated
UL & CSA approved
high efficiency up to 96%
no-load input current as low as 0.2 mA
wide operating temp: -40°C to +85°C
supports negative output
short circuit protection on the output
designed to meet EN/BS EN 62368-1
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
(%)
VX7803-1000
24
6~36
3.3
1000
3.3
75
90
VX7805-1000
24
12
8~36
8~27
5
-5
1000
-500
5
2.5
75
75
93
86
VX78039-1000
24
13~36
9
1000
9
75
95
VX78012-1000
24
12
16~36
8~20
12
-12
1000
-300
12
3.6
75
75
96
89
VX7815-1000
24
12
20~36
8~18
15
-15
1000
-300
15
4.5
75
75
96
89
Notes:
1. For input voltages higher than 30 Vdc, a 22 µF / 50 V input capacitor is required.
2. Tested at nominal input, 20~100% load, 20 MHz bandwidth, with 10 µF electrolytic and 1 µF ceramic capacitor on the output. At loads below 20%, the max ripple and
noise of the 3.3 & 5 Vdc outputs will be 100 mVp-p, and the other outputs will be 2% Vo.
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
VX78 XX - 1000
Base Number
Output Voltage
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Output Current
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CUI Inc │ SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 03/30/2023 │ page 2 of 7
INPUT
parameter
conditions/description
operating input voltage1
for positive output applications
for negative output applications
filter
capacitor filter
min
typ
max
units
6
8
24
12
36
27
Vdc
Vdc
0.1
1
mA
typ
max
units
680
330
μF
μF
input reverse polartiy protection no
no-load input current
Note:
positive outputs
1. See Model section on page 1 for specific input voltage ranges.
OUTPUT
parameter
conditions/description
maximum capacitive load2
for positive output applications
for negative output applications
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
±0.2
±0.4
%
load regulation
at nominal input, 10~100% load
±0.4
±0.6
%
switching frequency
at nominal input voltage, full load
3.3/5 Vdc output models
all other models
520
680
620
780
kHz
kHz
transient recovery time
at nominal input voltage, 25% load step change
0.1
1
ms
transient response deviation
at nominal input voltage, 25% load step change
50
300
mV
temperature coefficient
at full load
±0.03
%/°C
Note:
min
420
580
2. The maximum capacitive load was tested at nominal input voltage, full load.
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
certified to 60950-1: UL
designed to meet 62368-1: EN, BS EN
EMI/EMC
EN 55032, EN 55024
conducted emissions
CISPR22/EN55022, class B (external circuit required, see Figure 4-b)
radiated emissions
CISPR22/EN55022, class B (external circuit required, see Figure 4-b)
ESD
IEC/EN61000-4-2, contact ± 4kV, class B
radiated immunity
IEC/EN61000-4-3, 10V/m, class A
EFT/burst
IEC/EN61000-4-4, ± 1kV, class B (external circuit required, see Figure 4-a)
surge
IEC/EN61000-4-5, line-line ± 1kV, class B (external circuit required, see Figure 4-a)
conducted immunity
IEC/EN61000-4-6, 3 Vr.m.s, class A
MTBF
as per MIL-HDBK-217F, 25°C
RoHS
2011/65/EU
2,000,000
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hours
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CUI Inc │ SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 03/30/2023 │ page 3 of 7
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
wave soldering
see wave soldering profile
min
typ
Peak Temp. 260°C Max.
Wave Soldering Time
4 Sec. Max.
250
Temperature (°C)
200
10 Sec. Max.
150
100
50
0
MECHANICAL
Time (sec.)
parameter
conditions/description
dimensions
11.50 x 9.00 x 17.50 [0.453 x 0.354 x 0.689 inch]
min
case material
black flame-retardant heat-proof plastic (UL94V-0)
weight
typ
mm
3.8
MECHANICAL DRAWING
units: mm [inch]
tolerance: ±0.25[±0.010]
pin diameter tolerance: ±0.10[±0.004]
PIN CONNECTIONS
PIN
+OUTPUT
-OUTPUT
1
+VIN
+VIN
2
GND
-VOUT
3
+VOUT
GND
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CUI Inc │ SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
DERATING CURVE
EFFICIENCY CURVES
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date 03/30/2023 │ page 4 of 7
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CUI Inc │ SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
EFFICIENCY CURVES (CONTINUED)
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date 03/30/2023 │ page 5 of 7
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CUI Inc │ SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 03/30/2023 │ page 6 of 7
TYPICAL APPLICATION CIRCUIT
Figure 1
Figure 2
Positive Output Application Circuit
Negative Output Application Circuit
Figure 3
Positive and Negative Output Paralleling Application Circuit
Table 1
External Capacitor Table
Model Number
C1, C3
C2, C4
(ceramic capacitor) (ceramic capacitor)
VX7803-1000
10 μF/50 V
22 μF/10 V
VX7805-1000
10 μF/50 V
22 μF/10 V
VX78039-1000
10 μF/50 V
22 μF/16 V
VX78012-1000
10 μF/50 V
22 μF/25 V
VX7815-1000
10 μF/50 V
22 μF/25 V
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
C3
4.7 µF/50 V
LDM2
12 µH
1. C1 & C2 (C3 & C4) are required and should be connected as close to the module pins as possible.
2. To reduce the output ripple further, C2 & C4 can be increased as needed and the use of tantalum or low ESR electrolytic capacitors would be recommended.
3. When using application circuit in Figure 3, a 10 µH LDM component is recommended to reduce the interference.
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CUI Inc │ SERIES: VX78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR
date 03/30/2023 │ page 7 of 7
REVISION HISTORY
rev.
description
date
1.0
initial release
05/18/2017
1.01
features and safety line updated, packaging removed
01/14/2021
1.02
derating curve, efficiency curves and circuit figures updated
09/21/2021
1.03
safeties updated
12/20/2022
application circuits updated
03/30/2023
1.04
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
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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.