Specifications typical at Ta=+25℃, resistive load, nominal input voltage and rated output current unless otherwise noted.
Transient recovery time is measured to within 1% error band for a step change in output load of 75% to 100%
Ripple & Noise measurement bandwidth is 0-20MHz.
These power converters require a minimum output loading to maintain specified regulation, operation under no-load conditions will not damage these
modules; however they may not meet all specifications listed.
All DC/DC converters should be externally fused at the front end for protection.
Other input and output voltage may be available, please contact factory.
To order the converter with Remote On/Off function, add
suffix RC
(e.g. MKW2521-RC) to order code.
To order the converter with input filter meeting EN55022, Class A , add
suffix A
(e.g. MKW2521A) to order code.
To order the converter with heatsink, add
suffix H
(e.g. MKW2521H) to order code.
Specifications subject to change without notice.
E-mail:sales@minmax.com.tw
Tel:886-6-2923150
2011/09/27 REV:3
Page 3 of 5
®
MKW2500 SERIES
DC/DC CONVERTER 15W
Package Specifications
Mechanical Dimensions
2.54
[0.10]
10.16
[0.40]
10.16
[0.40]
Pin Connections
Pin
Single Output
1
2
3
4
5
20.32 [0.80]
1.00
[
0.04
]
4
5
Dual Output
+Vin
-Vin
+Vout
Common
-Vout
+Vin
-Vin
+Vout
No Pin
-Vout
3
6
50.8 [2.00]
Remote On/Off (Optional)
NC: No Connection
Bottom View
3.6 [0.14]
1
2
6
1.1 [0.04]
15.2 [0.60]
►
All
7.62
[0.30]
5.08
[0.20]
7.62
[0.30]
6.0
[0.24]
10.2
[0.40]
dimensions in mm (inches)
(X.XX±0.01)
X.XX±0.13 ( X.XXX±0.005)
►
Tolerance: X.X±0.25
25.4 [1.00]
►
Pin
diameter
1.0 ±0.05 (0.04±0.002)
Physical Characteristics
Case Size
Case Material
Base Material
Weight
:
:
:
:
50.8x25.4x10.2mm (2.0x1.0x0.40 Inches)
Metal With Non-Conductive Baseplate
FR4 PCB (flammability to UL 94V-0 rated)
32g
Physical Characteristics
Heatsink Material
Finish
23.0 [0.91]
Heatsink (Option –H)
:
:
:
Aluminum
Black Anodized Coating
9g
Weight
18.0 [0.71]Max
31.0 [1.22]Max
Heat-sink
Thermal pad
Clamp
Converter
►
The
advantages of adding a heatsink are:
1. To help heat dissipation and increase the stability
and reliability of DC/DC converters at high
operating temperature atmosphere.
2. To upgrade the operating temperature of DC/DC
converters, please refer to Derating Curve.
E-mail:sales@minmax.com.tw
Tel:886-6-2923150
2011/09/27 REV:3
Page 4 of 5
®
Test Configurations
MKW2500 SERIES
DC/DC CONVERTER 15W
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with a inductor Lin (4.7uH) and Cin (220uF, ESR < 1.0Ω 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
+
Lin
+Vin
Current
Probe
+Out
Load
DC / DC
Converter
-Vin
-Out
Cin
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.
+Vin
Single Output
DC / DC
Converter
-Vin
-Out
+Out
Copper Strip
Cout
Copper Strip
Resistive
Scope
Load
+Vin
Dual Output
DC / DC
Converter
-Vin
+Out
Com.
-Out
Copper Strip
Cout
Copper Strip
Cout
Copper Strip
Scope
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.
Overcurrent Protection
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 Source Impedance
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.
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 <
1.0Ω at 100 KHz) capacitor of a 22uF for the 12V input devices and a 6.8uF for the 24V and 48V devices.
+
DC Power
Source
-
+
Cin
-Vin
-Out
+Vin
DC / DC
Converter
+Out
Load
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.
+
DC Power
Source
-
-Vin
+Vin
Single Output
DC / DC
Converter
-Out
+Out
+
DC Power
Source
-
+Vin
+Out
Dual Output
DC / DC
Com.
Converter
Cout
Cout
Load
Load
Cout
Load
-Vin
-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℃.
The derating curves are determined from measurements obtained in a test setup.
Position of air velocity
probe and thermocouple
15mm / 0.6in
50mm / 2in
Air Flow
DUT
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