Datasheet

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date
05/25/2016
page
1 of 7
SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
FEATURES
•
•
•
•
•
•
•
•
•
•
up to 500 mA current output
pin compatible with LM78XX linear regulators
non-isolated switching regulator
high start-up current capability
wide input voltage range
efficiency up to 95%
low ripple and noise
short circuit protection
ultra-compact SIP3 package
-40°C to +85°C temperature range
MODEL
input
voltage
output
voltage
output
current
output
power
ripple
& noise1
efficiency2
typ
(Vdc)
range
(Vdc)
(Vdc)
min3
(mA)
max
(mA)
max
(W)
typ
(mVp-p)
typ
(%)
P78A03-0500
24
6~28
3.3
10
500
1.65
50
88
P78A05-0500
24
7~28
5
10
500
2.5
50
92
Notes:
1.
2.
3.
4.
At full load, nominal input, 20 MHz bandwidth oscilloscope.
At min Vin.
Operation under minimum load will not affect the reliability of the converter; however, the ripple and noise may exceed the specified values.
All specifications measured at: Ta=25°C, nominal input voltage, rated output load, and after warm up unless otherwise specified.
PART NUMBER KEY
P78A XX - 0500
Base Number
Output Voltage
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Output Current
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CUI Inc │ SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
date 05/25/2016 │ page 2 of 7
INPUT
parameter
conditions/description
operating input voltage
3.3 Vdc model
5 Vdc model
min
typ
max
units
6
7
24
24
28
28
Vdc
Vdc
no load input current
1.5
mA
OUTPUT
parameter
conditions/description
min
typ
maximum capacitive load
1
line regulation
measured from low to high line, full load
load regulation
measured from 10~100% load
max
units
220
μF
±0.5
%
±1
%
voltage accuracy
±3
%
switching frequency
570
kHz
Note:
1. Maximum capacitive load is tested at minimum input voltage and 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
conducted emissions
EN55022, class A, class B (external circuit required, see Figure 2)
radiated emissions
EN55022, class A, class B (external circuit required, see Figure 2)
MTBF
as per MIL-HDBK-217F, full load, 25 °C
as per MIL-HDBK-217F, full load, 85 °C
RoHS
2011/65/EU
4,185,000
2,182,000
hours
hours
ENVIRONMENTAL
parameter
conditions/description
min
operating temperature
see derating curve
storage temperature
vibration
max
units
-40
85
°C
-55
125
°C
10~55 Hz, 30 minutes along each axis
typ
2
G
SOLDERABILITY
parameter
conditions/description
wave soldering
see wave solder profile
Note:
min
2. The wave solder profile is measured on lead temperature.
3. Need to keep the solder parts internal temperature less than about 210°C.
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typ
max
units
260
°C
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CUI Inc │ SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
date 05/25/2016 │ page 3 of 7
MECHANICAL
parameter
conditions/description
dimensions
11.6 x 8.5 x 10.4
min
case material
non-conductive black plastic (UL94V-0)
potting material
silicone (UL94V-0)
typ
max
units
mm
weight
2
g
MECHANICAL DRAWING
units: mm
tolerance: XX.X=±0.50 mm
XX.XX=±0.25 mm
11.6
GND
3
-Vout
3.21
xxxx
0.5
Marking
xxxx
1 2 3
0.25
Ø1.0 +0.15/-0
5.08
2.54
2
10.4
+Vin
4.10
Function
1
8.5
2.0
PIN
0.51
PIN CONNECTIONS
2.54
Recommended PCB Layout
Top View
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CUI Inc │ SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
date 05/25/2016 │ page 4 of 7
DERATING CURVE
Temperature Derating Curve
Load (%)
100
80
60
Safe operating area
40
20
-40
-20
0
20
40
80 85
60
90
100
Ambient Temperature (°C)
EFFICIENCY CURVES
Efficiency vs. Load
5 Vdc output model
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
Efficiency vs. Load
3.3 Vdc output model
60
50
40
60
50
40
30
6 Vdc input
20
12 Vdc input
24 Vdc input
20
10
28 Vdc input
10
0
0
0.1
0.2
0.3
0.4
0.5
30
0.6
0
7 Vdc input
12 Vdc input
24 Vdc input
28 Vdc input
0
0.1
0.2
0.3
Output Current (A)
Output Current (A)
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0.4
0.5
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CUI Inc │ SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
date 05/25/2016 │ page 5 of 7
APPLICATION CIRCUIT
Figure 1
+VIN
+VOUT
C1
C2
GND
GND
Table 1
Optional External
Components
Notes:
C1
10μF MLCC
C2
10μF MLCC
1. The converter cannot be used as a positive to negative converter.
EMC RECOMMENDED CIRCUIT
EMC FILTERING
Figure 2
L1
+VIN
+VOUT
C1
C2
GND
GND
Table 2
Table 3
EN55022 Class A
Recommended External Circuit Components
EN55022 Class B
Recommended External Circuit Components
C1
L1
C2
C1
L1
C2
1206 4.7μF, 50V MLCC
3.3μH
NC
1210 10μF, 50V MLCC
10μH
1206 4.7μF, 50V MLCC
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CUI Inc │ SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
date 05/25/2016 │ page 6 of 7
PACKAGING
units: mm
Tube Size: 520 x 16.5 x 9.3 mm
QTY: 42 pcs
16.5±0.5
12.1±0.5
9.3±0.5
0.5±0.2
4.9±0.5
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CUI Inc │ SERIES: P78A-0500 │ DESCRIPTION: DC-DC CONVERTER
date 05/25/2016 │ page 7 of 7
REVISION HISTORY
rev.
1.0
description
date
initial release
05/25/2016
The revision history provided is for informational purposes only and is believed to be accurate.
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