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date 03/21/2014
page 1 of 6
SERIES: V78-1500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
date 03/21/2014
page 1 of 6
FEATURES
• 1.5 A current output
• extremely high efficiency up to 97%
• no heat sink required
• pin compatible to LM78XX linear regulators
• available in straight and right angle SIP packages
• low ripple and noise
• short circuit protection, thermal shutdown
• wide temperature (-40~85°C)
PART NUMBER KEY
MODEL input
voltage
output
voltage
output
current
ripple
and noise1
effi ciency
typ
(Vdc)
range
(Vdc) (Vdc)
max
(mA)
max
(mVp-p)
Vin max
(%)
V7802-1500* 12 4.75~18 2.5 1,500 45 85
V7803-1500 12 4.75~18 3.3 1,500 45 88
V7805-1500 12 6.5~18 5 1,500 45 91
V7806-1500 12 8~18 6.5 1,500 45 93
Notes: 1. ripple and noise are measured at 20 MHz BW
*. Discontinued
V78 XX - 1500 X
Output Voltage Output Current
Base Number "blank" = straight pins
R = 90° pins
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CUI Inc │ SERIES: V78-1500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR date 03/21/2014 │ page 2 of 6
INPUT
parameter conditions/description min typ max units
operating input voltage
2.5 and 3.3 V outputs
5 V output
6.5 V output
4.75
6.5
8
12
12
12
18
18
18
Vdc
Vdc
Vdc
OUTPUT
parameter conditions/description min typ max units
line regulation Vin = min ~ max, at full load ±0.5 ±0.75 %
load regulation measured from 10% load to full load ±0.5 ±1.0 %
voltage accuracy 100% load ±2 ±3 %
switching frequency 100% load, input voltage range 300 340 380 kHz
temperature coeffi cient ±0.02 %/°C
PROTECTIONS
parameter conditions/description min typ max units
short circuit protection continuous, automatic recovery
thermal shutdown 150 °C
SAFETY AND COMPLIANCE
parameter conditions/description min typ max units
EMI/EMC EN 55022 class B, EN 61000-4-2 class A
MTBF 2,000,000 hours
RoHS 2011/65/EU
ENVIRONMENTAL
parameter conditions/description min typ max units
operating temperature -40 85 °C
storage temperature -55 125 °C
case temperature 100 °C
storage humidity non-condensing 95 %
temperature rise at full load 25 °C
lead temperature 1.5 mm from case for 10 seconds 300 °C
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CUI Inc │ SERIES: V78-1500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR date 03/21/2014 │ page 3 of 6
MECHANICAL
parameter conditions/description min typ max units
dimensions 0.689 x 0.354 x 0.453 (11.50 x 9.00 x 17.50 mm) inch
case material plastic (UL94-V0)
weight 4.0 g
0.30 [0.012]
0.50 [0.020]
4.10 [0.161]
17.50 [0.689]
0.50 [0.020]
2.15
[0.085]
5.08 [0.200]
12 3
9.00 [0.354]
11.50[0.453]
V78XX-1500
(Bottom View) (Bottom View)
9.00 [0.354]
2.15
[0.085]
4.10[0.161]
V78XX-1500R
17.50 [0.689]
0.50 [0.020]
5.08[0.200]
11.50[0.453]
1.50
[0.059]
123
2.54 [0.100]
1.00 [0.039]
12 3
2.54 [0.100]
2.15 [0.085]
5.08 [0.200]
1.00 [0.039]
5.08 [0.200]
1.35 [0.053]
1
2
3
MECHANICAL DRAWING
PIN CONNECTIONS
PIN FUNCTION
1 +Vin
2 GND
3+Vo
units: mm [inches]
tolerance: ±0.25 [±0.010]
pin section tolerance: ±0.10 mm [±0.004]
100
80
60
40
20
Ambient Temperature (°C)
Load (%)
-40 -20 0 20 40 60 71 85 100 120
DERATING CURVES
1. output power vs. ambient temperature
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CUI Inc │ SERIES: V78-1500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR date 03/21/2014 │ page 4 of 6
EXTERNAL CAPACITOR TABLE
TYPICAL APPLICATION CIRCUIT APPLICATION EXAMPLE
Part Number C1 (Ceramic capacitor) C2 (Ceramic capacitor)
V7802-1500 10μF/25V 22μF/6.3V
V7803-1500 10μF/25V 22μF/6.3V
V7805-1500 10μF/25V 22μF/16V
V7806-1500 10μF/25V 22μF/16V
V78XX-1500(R)
1
2
3
Vin
GND
+Vout
C2C1
Positive Output
V78XX-1500(R)
Negative Output
1
2
3
+Vin
GND
-Vout
C2
C1
GND
GND
V78XX-1500(R)
1
2
3
+Vin
GND
-Vou
t
C2
GND
V78XX-1500(R)
1
2
3+Vout
C3 C4
Note:
1. C1 and C2 are required and should be fitted close to the converter
pins.
2. The capacitance of C1and C2 sees external capacitor table, it can
be increased properly if required, and tantalum or low ESR
electrolytic capacitors may also suffice.
3. No parallel connection or plug and play.
C1
INPUT FILTER CIRCUIT
OUTPUT FILTER CIRCUIT
Vin
GND
10uF
10uH-47u
H
10uF
Vin Vo
GND
Vout
GND
Vin
GND
10uF
10uH-47u
H
22uF
Vin Vo
GND
10uF RL
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CUI Inc │ SERIES: V78-1500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR date 03/21/2014 │ page 5 of 6
EMC RECOMMENDED CIRCUIT
TEST CONFIGURATION
Vin
GND
2.2uF
1mH
1uF
Vin Vo
GND
1mH
330uF
Vout
GND
Efficiency and Output Voltage Ripple Test
Scope
Ceramic
3
Vin
GND
+Vout
C2
C1
25.4m
m
1
2.54 mm
DC/DC
Converter
2
25.4mm
12.7mm
1F 10 F
Ta n ta l um
Copper strip
Copper strip
Load
Start-up and Load Transient Response Test
3
Vin +Vout
C2
C1
50.8 mm
1
2.54 mm
DC/DC
Converter
2Scope
Copper strip
Load
GND
stripCopper
EFFICIENCY AND RIPPLE CURVES
V7802-1500
V7803-1500
V7805-1500
V7806-1500
Efficiency Ripple
Eff i cienc y VS. I nput volt age
Input voltage(V)
Efficienc
y(
%
)
V7802-1500
V7803-1500
V7805-1500
V7806-1500
V7802-1500
V7803-1500
V7805-1500
V7806-1500
Ripple VS. Load(Vin=nominal)
2
7
12
17
22
27
32
37
150 300 450 600 750 900 1050 1200 1350 1500
Load(mA)
Ri
pp
le
(
mV
)
Efficiency VS.Load(Vin=nominal)
50
60
70
80
90
100
150 300 450 600 750 900 1050 1200 1350 1500
Load(mA)
Efficiency(%)
Ripple VS.Input voltage(full load)
0
5
10
15
20
25
30
35
40
45
4.75 5 6 6.5 7.2 8 9 10 12 15 18 20
Input voltage(V)
Ripple(mV)
V7802-1500
V7803-1500
V7805-1500
V7806-1500
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CUI Inc │ SERIES: V78-1500 │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR date 03/21/2014 │ page 6 of 6
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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20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
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techsupport@cui.com
rev. description date
1.0 initial release 07/16/2010
1.01 V-Infi nity branding removed 09/04/2012
1.02 updated typical application circuits 09/25/2012
1.03 discontinued model V7802-1500 03/21/2014
The revision history provided is for informational purposes only and is believed to be accurate.
REVISION HISTORY
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