rev.
page
date
1 of 5
11/2009
PART NUMBER:
PK25
DESCRIPTION:
dc-dc converter
MODEL
1
PK25-D5-S3.3
PK25-D5-S5
PK25-D5-S12
PK25-D5-S15
PK25-D5-D5
PK25-D5-D12
PK25-D5-D15
PK25-D12-S3.3
PK25-D12-S5
PK25-D12-S12
PK25-D12-S15
PK25-D12-D5
PK25-D12-D12
PK25-D12-D15
PK25-D24-S3.3
PK25-D24-S5
PK25-D24-S12
PK25-D24-S15
PK25-D24-D5
PK25-D24-D12
PK25-D24-D15
PK25-D48-S3.3
PK25-D48-S5
PK25-D48-S12
PK25-D48-S15
PK25-D48-D5
PK25-D48-D12
PK25-D48-D15
in
u
output
voltage
output
current
(min)
output
current
(max)
output
power
(max)
input
voltage
D
10.6W
16.0W
20.4W
21.0W
16.0W
20.4W
21.0W
13.2W
20.0W
25.2W
25.5W
20.0W
25.2W
25.5W
13.2W
20.0W
25.2W
25.5W
20.0W
25.2W
25.5W
13.2W
20.0W
25.2W
25.5W
20.0W
25.2W
25.5W
4.5-9VDC
4.5-9VDC
4.5-9VDC
4.5-9VDC
4.5-9VDC
4.5-9VDC
4.5-9VDC
8-16.5VD
9-18VDC
9-18VDC
9-18VDC
9-18VDC
9-18VDC
9-18VDC
18-36VDC
18-36VDC
18-36VDC
18-36VDC
18-36VDC
18-36VDC
18-36VDC
32-72VDC
32-72VDC
32-72VDC
32-72VDC
32-72VDC
32-72VDC
32-72VDC
3.3VDC
5VDC
12VDC
15VDC
±5VDC
±12VDC
±15VDC
3.3VDC
5VDC
12VDC
15VDC
±5VDC
±12VDC
±15VDC
3.3VDC
5VDC
12VDC
15VDC
±5VDC
±12VDC
±15VDC
3.3VDC
5VDC
12VDC
15VDC
±5VDC
±12VDC
±15VDC
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
ed
ripple & noise
2
mV P-P
efficiency
(typ.)
features
·industry standard pin out
·wide 2:1 input range
·fully isolated
·output voltage trimmable
·low ripple & noise
·over-current protection
·over-voltage protection
·output on/off control
·HI-POT tested
·constant switching frequency
·high efficiency
·compact size 2.56”x2.0”x0.375”
·3 year warranty
3.2A
3.2A
1.7A
1.4A
1.6A
0.85A
0.7A
4.0A
4.0A
2.1A
1.7A
2.0A
1.05A
0.85A
4.0A
4.0A
2.1A
1.7A
2.0A
1.05A
0.85A
4.0A
4.0A
2.1A
1.7A
2.0A
1.05A
0.85A
75
75
120
150
100/100
120/120
150/150
75
75
120
150
100/100
120/120
150/150
75
75
120
150
100/100
120/120
150/150
75
75
120
150
100/100
120/120
150/150
73%
75%
77%
77%
75%
77%
77%
83%
85%
89%
89%
80%
86%
86%
83%
85%
89%
90%
82%
86%
86%
83%
85%
90%
90%
82%
86%
86%
NOTE:
1. All models (excluding the 5 V dc input, D5) are also available in an extended temperature range of -40°C~85°C.
For these models, append “M” to the model number, e.g. PK25-D12-S3.3M.
2. Ripple & noise measured with a 20MHz bandwidth, off a 10uF electrolytic and a 0.1uF ceramic cap in parallel at the
ouptut.
is
20050
SW
112
th
Ave. Tualatin, Oregon
97062
phone
503.612.2300
fax
503.612.2383
co
nt
www.v-infinity.com
rev.
page
date
2 of 5
11/2009
PART NUMBER:
PK25
DESCRIPTION:
dc-dc converter
INPUT
parameter
input voltage range
conditions/description
min
4.5
9
18
36
constant
nom
5
12
24
48
max
9
18
36
72
units
VDC
VDC
VDC
VDC
KHz
switching frequency
OUTPUT
parameter
set point accuracy
line regulation
load regulation
minimum load
ripple and noise
conditions/description
all models
single output models
dual output models (10% min. load)
20 MHz bandwidth
in
u
1.0% Vout
nom
max
135%
140%
min
80%
500
100M
nom
max
89%
STS
94 V-0
65
(2.29)
470k
-20
-40
-40
20%
min
-2%
-0.5%
-1.0%
-2.5%
0.0
PROTECTION
parameter
conditions/description
min
3
over-current
continuous auto recovery
105%
over-voltage
internally zener clamped
3
110%
NOTE:
3 continuous operation in a protected state may compromise long-term reliability.
co
MIL-HDBK-217F
regular models
extended temperature models
operating (non-condensing)
not intended for aqueous wash
parameter
efficiency
dielectric withstand
insulation resistance
agency standards
case material
material flammability
weight
conditions/description
typical at full load
input/case, input/output, output/case
at 500 VDC
approved to UL1950, EN60950, CISPR22, CE
nt
GENERAL
MTBF
operating temperature
storage temperature
humidity
washability
D
is
20050
SW
112
th
Ave. Tualatin, Oregon
97062
phone
503.612.2300
fax
503.612.2383
ed
300
nom
max
+2%
+0.5%
+1.0%
+2.5%
units
Amps
mVpp
units
units
VAC
Ohms
grams
(ounces)
hours
+71
°C
+85
°C
+105
°C
90%
RH
www.v-infinity.com
rev.
page
date
3 of 5
11/2009
PART NUMBER:
PK25
DESCRIPTION:
dc-dc converter
DIMENSIONS (mm)
Pin Assignments
2.56
(65.0)
CL
0.2
(5.08)
1
IN
OUT
4
5
2
0.2
(5.08)
3
0.19
(4.68)
6
7
0.6
(15.24)
0.2
(5.08)
Label
0.19
(4.68)
in
u
2.0
(50.0)
0.3
(7.62)
CL
0.3
(7.62)
Outside edge
0.2
(5.08)
1
0.37
(9.5)
CL
4
5
2
3
6
7
0.6
(15.24)
0.2
(5.08)
2.2
(55.88)
nt
1.6
(41.0)
2.2
(55.88)
0.04
(1.0)
0.18
(4.56)
D
is
20050
SW
112
th
Ave. Tualatin, Oregon
97062
phone
503.612.2300
fax
503.612.2383
co
www.v-infinity.com
ed
Single Output
1. +Vin
2. -Vin
3. CNT
4.
5.
6.
7.
Dual Output
1. +Vin
2. -Vin
3. CNT
4.
5.
6.
7.
+Vout
N o p in
Gnd
Trim
+Vout
C om
-Vout
Trim
7-
0.05(1.3)
0.3
(7.62)
0.3
(7.62)
0.2
(5.08)
All dimensions are in inches (mm).
TOP VIEW
rev.
page
date
4 of 5
11/2009
PART NUMBER:
PK25
DESCRIPTION:
dc-dc converter
APPLICATION NOTES
1. OUTPUT TRIMMING
The output voltages are preset to nominal values as indicated by the models table at the factory. If desired, the output voltage may
optionally be trimmed to a different value (+/- 10%) with external resistors and/or potentiometer as shown below.
+Vin
FIGURE 1. TRIMMING WITH
EXTERNAL POTENTIOMETER
+Vo
Trim
10KW
Trimpot
-Vin
To trim the output voltage with fixed resistors, the output voltage can be calculated as follows.
+Vin
+Vo
in
u
+Vin
+Vo
R load
-Vo
Trim
R trim-up
ed
R load
R trim-down
R load
Trim
-Vin
nt
=
47.94 KΩ
Model
PK25-DXX-S3.3
PK25-DXX-S5
PK25-DXX-S12
PK25-DXX-S15
PK25-DXX-D5
PK25-DXX-D12
PK25-DXX-D15
*PK25-D5-S3.3
-Vo
-Vin
-Vo
Trim-Up
Trim-Down
(V
o
- V
r
) · R
1
· R
2
V
r
· R
1
- (V
o
- V
r
) · R
2
FIGURE 2: TRIM-UP VOLTAGE SETUP
FIGURE 3: TRIM-DOWN VOLTAGE SETUP
The value of
R
trim-up
is defined as:
co
as follows:
R
trim_up
=
V
r
· R
1
· R
2
R
2
· (V
o
- V
r
) - V
r
· R
1
R
trim_down
=
The value of
R
trim-down
is defined as:
Where:
R
trim-down
is the external resistor in
K
Ω
.
V
o
is the
desired output voltage.
R
1
and
R
2
and
V
r
are internal to
the unit and are defined in Table 1. For example to trim down
the PK25-D5-D12 down by 5% to 22.8 V,
R
trim-down
is calculated
as follows:
Where:
R
trim-up
is the external resistor in
K
Ω
.
V
o
is the
desired output voltage.
R
1
and
R
2
and
V
r
are internal to
is
the unit and are defined in Table 1. For example to trim up
the PK25-D5-D12 up by 5% to 25.2 V,
R
trim-up
is calculated
V
o
= 25.2 /
R
1
= 21 KΩ /
R
2
= 2.43 KΩ
/
V
r
= 2.5
2.5 · 21 · 2.43
2.43 · (25.2 - 2.5) - 2.5 · 21
V
o
= 22.8 /
R
1
= 21 KΩ /
R
2
= 2.43 KΩ
/
V
r
= 2.5
D
R
trim_up
=
R
trim_down
=
R1 (KΩ) R2 (KΩ) Vr (V)
4.12
2.49
1.25
2.43
2.43
2.5
9.31
2.43
2.5
12.7
2.49
2.5
7.5
2.49
2.5
21
2.43
2.5
26.7
2.43
2.5
0.787
2.43
2.5
(22.8 - 2.5) · 21 · 2.43
2.5 - 2.1 (22.8 - 2.5) · 2.43
=
326.68 KΩ
Table 1
20050
SW
112
th
Ave. Tualatin, Oregon
97062
phone
503.612.2300
fax
503.612.2383
www.v-infinity.com
rev.
page
date
5 of 5
11/2009
PART NUMBER:
PK25
DESCRIPTION:
dc-dc converter
2. ON/OFF CONTROL (CNT)
The ground terminal of remote ON/OFF circuit is connected with -V input terminal. Between CNT and -V input: output voltage is ON
at “low” level or short circuit (0~1.2 V). Between CNT and -V input: output voltage is OFF at “high” level or open circuit (2.4~5.5 V).
R
FIGURE 4. CONNECTION EXAMPLE
CNT
-V
Transistor
function is not used, please short between CNT and -V input.
CNT level for INPUT -V
L(Less than 1.2V) OR Short
HL(More than 2.4V) OR Open
D
is
20050
SW
112
th
Ave. Tualatin, Oregon
97062
phone
503.612.2300
fax
503.612.2383
co
www.v-infinity.com
nt
in
u
OUTPUT
ON
OFF
When CNT terminal is “low” level, fan out current is 1 mA typical. When Vcc is applied, use 5 V
≤
Vcc
≤
24 V. When remote ON/OFF
ed
IC
VCC
Relay
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