MKW2500 Series
15W, Wide Input Range, Single & Dual Output DC/DC Converters
Key Features
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Efficiency up to 86%
1500VDC Isolation
MTBF > 700,000 Hours
2:1 Wide Input Range
CSA1950 Safety Approval
Complies with EN55022 Class A
Six-Sided Shielding
Remote On/Off Control
UL 94V-0 Package Material
Internal SMD Construction
Minmax's MKW2500 series, comprising 21 different models, has
been conceived as an application specific range of DC/DC converters,
specially addressing data communication equipments, mobile battery
2:1
High
Power
Density
Wide Range
More Power
driven equipments, distributed power systems, telecommunication
equipments, mixed analog/digital subsystems, process/machine control
equipments, computer peripheral systems and industrial robot systems.
Packing up to 15W of power into a 2x1x0.4 inch package, with
efficiency as high as 86%, the MKW2500 has wide input ranges of
9-18VDC, 18-36VDC and 36-75VDC which is available in output
1500
VDC
voltages of 3.3V, 5V, 5.1V, 12V, 15V, {12V and {15VDC.
Other feathers include continuous short circuit protection, remote
on/off, six-sided shielded case and EN55022 Class A conducted noise
I/O Isolation
compliance minimize design-in time, cost and eliminate the need for
EMI
EN55022
Remote on/off
external filtering.
Block Diagram
Single Output
+Vin
Dual Output
+Vo
LC
Filter
+Vin
+Vo
LC
Filter
Com.
-Vo
-Vin
1
PWM
Isolation
Ref.Amp
-Vo
-Vin
MINMAX
PWM
Isolation
Ref.Amp
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MKW2500 Series
Model Selection Guide
Model
Number
MKW2521
MKW2522
MKW2523
MKW2524
MKW2526
MKW2527
MKW2529
MKW2531
MKW2532
MKW2533
MKW2534
MKW2536
MKW2537
MKW2539
MKW2541
MKW2542
MKW2543
MKW2544
MKW2546
MKW2547
MKW2549
Input
Voltage
Output
Voltage
VDC
VDC
3.3
5
12
15
{12
{15
5.1
3.3
5
12
15
{12
{15
5.1
3.3
5
12
15
{12
{15
5.1
12
( 9 ~ 18 )
24
( 18 ~ 36 )
48
( 36 ~ 75 )
Output Current
Max.
mA
3000
3000
1250
1000
{625
{500
3000
3000
3000
1250
1000
{625
{500
3000
3000
3000
1250
1000
{625
{500
3000
Min.
mA
300
300
125
100
{62.5
{50
300
300
300
125
100
{62.5
{50
300
300
300
125
100
{62.5
{50
300
@Max. Load @No Load
mA (Typ.) mA (Typ.)
1057
1524
1452
1452
1452
1452
1574
528
762
726
726
726
726
787
264
381
363
363
363
363
393
Reflected
Ripple
Current
mA (Typ.)
30
50
20
40
10
30
Efficiency
@Max. Load
% (Typ.)
78
82
86
86
86
86
81
78
82
86
86
86
86
81
78
82
86
86
86
86
81
Notes :
Absolute Maximum Ratings
Parameter
12VDC Input Models
Input Surge Voltage
24VDC Input Models
( 1000 mS )
48VDC Input Models
Lead Temperature (1.5mm from case for 10 Sec.)
Internal Power Dissipation
Input Current
Min.
-0.7
-0.7
-0.7
-----
Max.
25
50
100
260
5,000
Unit
VDC
VDC
VDC
]
mW
Exceeding the absolute maximum ratings of the unit could cause damage.
These are not continuous operating ratings.
1. Specifications typical at Ta=+25], resistive load,
nominal input voltage, rated output current unless
otherwise noted.
2. Transient recovery time is measured to within 1%
error band for a step change in output load of 75%
to 100%.
3. Ripple & Noise measurement bandwidth is 0-20
MHz.
4. These power converters require a minimum output
loading to maintain specified regulation.
5. Operation under no-load conditions will not damage
these modules; however, they may not meet all
specifications listed.
6. All DC/DC converters should be externally fused at
the front end for protection.
Environmental Specifications
Parameter
Operating Temperature
Operating Temperature
Storage Temperature
Humidity
Cooling
RFI
Conducted EMI
REV:0 2005/04
Conditions
Ambient
Case
Min.
Max.
-40
+60
-40
+100
-50
+125
--95
Free-Air Convection
Six-Sided Shielded, Metal Case
EN55022 Class A
Unit
]
]
]
%
MINMAX
7. Other input and output voltage may be available,
please contact factory.
8. To order the converter with Remote On/Off function,
please add a suffix -RC (e.g. MKW2521-RC).
9. To order the converter with EN55022 Class A
function, please add a suffix A (e.g. MKW2521A).
10. Specifications subject to change without notice.
2
MKW2500 Series
Input Specifications
Parameter
Start Voltage
Under Voltage Shutdown
Model
Min.
Typ.
Max.
12V Input Models
8
8.5
9
24V Input Models
15
17
18
48V Input Models
30
33
36
12V Input Models
7
8
8.5
24V Input Models
13
15
17
48V Input Models
25
29
34
---
---
1
A
---
---
3500
mW
Reverse Polarity Input Current
Short Circuit Input Power
All Models
Input Filter
Unit
VDC
Pi Filter
Output Specifications
Parameter
Conditions
Min.
Typ.
Max.
Unit
---
{1.0
{2.0
%
Dual Output, Balanced Loads
---
{0.5
{2.0
%
Line Regulation
Vin=Min. to Max.
---
{0.1
{0.5
%
Load Regulation
Io=10% to 100%
---
{0.5
{1.0
%
---
55
80
mV P-P
---
---
100
mV P-P
---
---
15
mV rms
Over Power Protection
120
---
---
%
Transient Recovery Time
---
300
500
uS
Output Voltage Accuracy
Output Voltage Balance
Ripple & Noise (20MHz)
Ripple & Noise (20MHz)
Over Line, Load & Temp
Ripple & Noise (20MHz)
Transient Response Deviation
25% Load Step Change
Temperature Coefficient
Output Short Circuit
---
{2
{4
%
---
{0.01
{0.02
%/]
Continuous
General Specifications
Parameter
Conditions
Min.
Typ.
Max.
Unit
Isolation Voltage Rated
60 Seconds
1500
---
---
VDC
Isolation Voltage Test
Flash Tested for 1 Second
1650
---
---
VDC
Isolation Resistance
500VDC
1000
---
---
M[
Isolation Capacitance
100KHz,1V
---
1200
1500
pF
Switching Frequency
MTBF
290
330
400
KHz
MIL-HDBK-217F @ 25], Ground Benign
700
---
---
K Hours
Conditions
Min.
Typ.
Max.
Unit
Remote On/Off Control
Parameter
Supply On
2.5 to 5.5VDC or Open Circuit
Supply Off
-0.7
---
0.8
VDC
Standby Input Current
---
---
10
mA
---
---
50
uA
---
---
-1
mA
Control Input Current ( on )
Vin-RC=5.0V
Control Input Current ( off )
Vin-RC=0V
Control Common
3
Referenced to Negative Input
MINMAX
REV:0 2005/04
MKW2500 Series
Capacitive Load
Models by Vout
Maximum Capacitive Load
3.3V
5V
5.1V
12V
15V
{12V #
{15V #
Unit
470
470
470
470
470
220
220
uF
# For each output
Input Fuse Selection Guide
12V Input Models
24V Input Models
48V Input Models
2500mA Slow - Blow Type
1250mA Slow - Blow Type
750mA Slow - Blow Type
Input Voltage Transient Rating
150
140
130
120
48VDC Input Models
110
Vin ( VDC )
100
90
80
24VDC Input Models
70
60
50
40
12VDC Input Models
30
20
10
0
10uS
REV:0 2005/04
100uS
1mS
MINMAX
10mS
100mS
4
100
100
90
90
Efficiency (%)
Efficiency (%)
MKW2500 Series
80
70
60
80
70
60
50
50
Low
Nom
High
Low
Nom
Input Voltage (V)
Input Voltage (V)
Efficiency vs Input Voltage ( Single Output )
Efficiency vs Input Voltage ( Dual Output )
90
100
80
90
80
Efficiency (%)
70
Efficiency (%)
High
60
50
70
60
50
40
30
40
10
40
20
60
80
30
100
Load Current (%)
20
40
60
80
100
Load Current (%)
Efficiency vs Output Load ( Single Output )
100
Efficiency vs Output Load ( Dual Output )
400LFM
100LFM
80
Output Power (%)
10
200LFM
Natural
convection
60
40
20
0
〜
-40
50
60
70
90
80
Ambient Temperature
100
110
]
Derating Curve
5
MINMAX
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MKW2500 Series
Test Configurations
Overcurrent Protection
Input Reflected-Ripple Current Test Setup
To provide protection in a fault (output overload) condition,
the unit is equipped with internal current limiting circuitry and
can endure current limiting for an unlimited duration. At the
point of current-limit inception, the unit shifts from voltage
control to current control. The unit operates normally once the
output current is brought back into its specified range.
Input reflected-ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0[ at 100 KHz) to
simulate source impedance.
Capacitor Cin, offsets possible battery impedance .
Current ripple is measured at the input terminals of the
module, measurement bandwidth is 0-500 KHz.
To Oscilloscope
+
+
Battery
+Vin
Lin
Cin
-Vin
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power module.
In applications where power is supplied over long lines and
output loading is high, it may be necessary to use a capacitor
at the input to ensure startup.
+Out
DC / DC
Converter
Current
Probe
Input Source Impedance
Load
-Out
Peak-to-Peak Output Noise Measurement Test
Use a Cout 0.47uF ceramic capacitor.
Scope measurement should be made by using a BNC
socket, measurement bandwidth is 0-20 MHz. Position the
load between 50 mm and 75 mm from the DC/DC Converter.
Capacitor mounted close to the power module helps
ensure stability of the unit, it is recommended to use a good
quality low Equivalent Series Resistance (ESR < 1.0[ at 100
KHz) capacitor of a 22uF for the 12V input devices and a
6.8uF for the 24V and 48V devices.
+
+Vin
+Out
Single Output
DC / DC
Converter
Copper Strip
Cout
-Vin
-Out
+Vin
+Out
Dual Output
DC / DC
Converter
Com.
-Vin
-Out
DC Power
Source
Resistive
Scope
Load
-
+Vin
+
+Out
DC / DC
Converter
Load
Cin
-Vin
-Out
Copper Strip
Cout
Scope
Cout
Scope
Resistive
Load
Design & Feature Considerations
Remote On/Off
Positive logic remote on/off turns the module on during a
logic high voltage on the remote on/off pin, and off during a
logic low.
To turn the power module on and off, the user must supply
a switch to control the voltage between the on/off terminal and
the -Vin terminal.
The switch can be an open collector or equivalent.
A logic low is -0.7V to 0.8V.
A logic high is 2.5V to 5.5V.
The maximum sink current at on/off terminal during a logic
low is -1 mA.
The maximum allowable leakage current of the switch at
on/off terminal (2.5 to 5.5V) is 50uA.
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MINMAX
6
MKW2500 Series
Output Ripple Reduction
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and noise
performance.
To reduce output ripple, it is recommended to use 4.7uF
capacitors at the output.
+
+Vin
Single Output
DC / DC
Converter
DC Power
Source
-
-Vin
+
+Vin
Cout
Load
-Out
+Out
Dual Output
DC / DC Com.
Converter
DC Power
Source
-
+Out
-Vin
Cout
Load
-Out
Maximum Capacitive Load
The MKW2500 series has limitation of maximum
connected capacitance at the output.
The power module may be operated in current limiting
mode during start-up, affecting the ramp-up and the startup
time.
For optimum performance we recommend 220uF
maximum capacitive load for dual outputs and 470uF
capacitive load for single outputs.
The maximum capacitance can be found in the data sheet.
Thermal Considerations
Many conditions affect the thermal performance of the
power module, such as orientation, airflow over the module
and board spacing. To avoid exceeding the maximum
temperature rating of the components inside the power
module, the case temperature must be kept below 100°C.
The derating curves are determined from measurements
obtained in an experimental apparatus.
Position of air velocity
probe and thermocouple
15mm / 0.6in
7
50mm / 2in
Air Flow
DUT
MINMAX
REV:0 2005/04
MKW2500 Series
Mechanical Dimensions
5
6
Dual Output
15.2 [0.60]
2
Side
1.00[
Bottom
1
0.039]
4
20.30 [0.800]
3
Single Output
2.5 [0.1]
50.8 [2.00]
10.20 [0.402] 10.20 [0.402]
Connecting Pin Patterns
Top View ( 2.54 mm / 0.1 inch grids )
10.2 [0.40]
5.08 [0.200]
25.4 [1.00]
Tolerance
Pin
6.0 [0.24]
10.2 [0.40]
Millimeters
Inches
X.X{0.25
X.XX{0.01
X.XX{0.13
{0.05
X.XXX{0.005
{0.002
Pin Connections
Physical Characteristics
Pin
Single Output
Dual Output
1
+Vin
+Vin
2
-Vin
-Vin
3
+Vout
+Vout
4
No Pin
Common
-Vout
-Vout
5
6
50.8*25.4*10.2 mm
Case Size
:
Case Material
: Metal With Non-Conductive Baseplate
Weight
: 32g
Flammability
: UL94V-0
2.0*1.0*0.4 inches
Remote On/Off (Optional)
The MKW2500 converter is encapsulated in a low thermal resistance molding compound that has excellent resistance/electrical
characteristics over a wide temperature range or in high humidity environments.
The encapsulant and unit case are both rated to UL 94V-0 flammability specifications.
Leads are tin plated for improved solderability.
REV:0 2005/04
MINMAX
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