MEW1000 Series
2W, Wide Input Range SIP, Single & Dual Output DC/DC Converters
Key Features
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Low Noise
Low Profile
Low Cost
Efficiency up to 80%
1500VDC Isolation
MTBF > 1,000,000 Hours
4:1 Wide Input Range
Low Cost
Remote On/Off Control
Low Ripple and Noise
Temperature Performance -40] to +75]
UL 94V-0 Package Material
Internal SMD Construction
1500
VDC
4:1
Remote on/off
I/O Isolation
Wide Range
Minmax's MEW1000-Series power modules are low-profile dc-dc converters that operate over input voltage ranges of 9-36VDC and
18-75VDC which provide precisely regulated output voltages of 3.3V, 5V, 12V, 15V, {5V, {12V and {15VDC.
The MEW1000 series is an excellent selection for data communication equipments, mobile battery driven equipments, distributed power
systems, telecommunication equipments, mixed analog/digital subsystems, process/machine control equipments, computer peripheral
systems and industrial robot systems.
The modules have a maximum power rating of 2W and a typical full-load efficiency of 80%, continuous short circuit, 30mV output ripple,
built-in filtering for both input and output minimize the need for external filtering.
Absolute Maximum Ratings
Environmental Specifications
Input Surge Voltage
( 1000 mS )
Parameter
24VDC Input Models
48VDC Input Models
Lead Temperature (1.5mm from case for 10 Sec.)
Min.
-0.7
-0.7
---
Max.
50
100
260
Unit
VDC
VDC
]
Parameter
Operating Temperature
Operating Temperature
Storage Temperature
Internal Power Dissipation
---
2,500
mW
Humidity
Cooling
Exceeding the absolute maximum ratings of the unit could cause damage.
These are not continuous operating ratings.
1
MINMAX
Conditions
Ambient
Case
Min.
-40
-40
-55
Max.
+75
+90
+105
--95
Free-Air Convection
Unit
]
]
]
%
REV:3 2008/10/02
MEW1000 Series
Model Selection Guide
Model
Number
MEW1021
MEW1022
MEW1023
MEW1024
MEW1025
MEW1026
MEW1027
MEW1031
MEW1032
MEW1033
MEW1034
MEW1035
MEW1036
MEW1037
Input
Voltage
Output
Voltage
VDC
VDC
3.3
5
12
15
{5
{12
{15
3.3
5
12
15
{5
{12
{15
24
( 9 ~ 36 )
48
( 18 ~ 75 )
Output Current
Max.
mA
500
400
167
134
{200
{83
{67
500
400
167
134
{200
{83
{67
Min.
mA
125
100
42
33
{50
{21
{17
125
100
42
33
{50
{21
{17
Input Current
@Max. Load
mA (Typ.)
97
110
106
105
114
108
106
49
58
54
54
60
55
55
Reflected
Ripple
Current
@No Load
mA (Typ.)
mA (Typ.)
20
300
15
600
Efficiency
@Max. Load
% (Typ.)
71
76
79
80
73
77
79
70
72
78
78
70
76
76
Capacitive Load
Models by Vout
Maximum Capacitive Load
# For each output
3.3V
5V
12V
15V
{5V #
{12V #
{15V #
Unit
2200
1000
170
110
470
100
47
uF
Input Fuse Selection Guide
24V Input Models
48V Input Models
350mA Slow - Blow Type
135mA Slow - Blow Type
Input Specifications
Model
Min.
Typ.
Max.
Start Voltage
Parameter
24V Input Models
4.5
6
8.5
48V Input Models
8.5
12
17
Under Voltage Shutdown
24V Input Models
---
---
8
48V Input Models
---
---
16
---
---
0.5
A
---
---
1500
mW
Reverse Polarity Input Current
Short Circuit Input Power
All Models
Input Filter
REV:3 2008/10/02
Unit
VDC
Capacitor type
MINMAX
2
MEW1000 Series
Output Specifications
Parameter
Conditions
Min.
Typ.
Max.
Unit
---
{1.0
{2.0
%
Dual Output, Balanced Loads
---
{1.0
{2.0
%
Line Regulation
Vin=Min. to Max.
---
{0.3
{0.5
%
Load Regulation
Io=25% to 100%
---
{0.5
{0.75
%
---
30
50
mV P-P
Output Voltage Accuracy
Output Voltage Balance
Ripple & Noise (20MHz)
---
---
75
mV P-P
Ripple & Noise (20MHz)
Ripple & Noise (20MHz)
---
---
15
mV rms
Over Power Protection
120
---
---
%
Transient Recovery Time
---
100
300
uS
---
{3
{5
%
---
{0.01
{0.02
%/]
Transient Response Deviation
Over Line, Load & Temp.
25% Load Step Change
Temperature Coefficient
Output Short Circuit
Continuous
General Specifications
Parameter
Conditions
Min.
Typ.
Max.
Unit
Isolation Voltage Rated
60 Seconds
1500
---
---
VDC
Flash Tested for 1 Second
1650
---
---
VDC
Isolation Resistance
Isolation Voltage Test
500VDC
1000
---
---
M[
Isolation Capacitance
100KHz,1V
---
250
500
pF
---
300
---
KHz
MIL-HDBK-217F @ 25], Ground Benign
1000
---
---
K Hours
Switching Frequency
MTBF
Remote On/Off Control
Parameter
Conditions
Supply On
Min.
Typ.
Max.
Unit
Under 0.6 VDC or Open Circuit, drops down to 0VDC by 2mV/]
Supply Off
2.9
Device Standby Input Current
---
15
VDC
mA
---
1
3
Control Input Current ( on )
Vin = 0V
---
---
-1
mA
Control Input Current ( off )
Vin = 5.0V
---
---
1
mA
Control Common
Referenced to Negative Input
Notes:
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 on the front end for protection.
7. Other input and output voltage may be available, please contact factory.
8. Specifications subject to change without notice.
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MINMAX
REV:3 2008/10/02
MEW1000 Series
Block Diagram
Single Output
Dual Output
+Vo
+Vin
+Vo
+Vin
Com.
-Vo
-Vo
-Vin
PFM
On/Off
Isolation
Ref.Amp
-Vin
On/Off
PFM
Isolation
Ref.Amp
Input Voltage Transient Rating
150
140
130
48VDC Input Models
120
110
Vin ( VDC )
100
90
80
24VDC Input Models
70
60
50
40
30
20
10
0
10uS
REV:3 2008/10/02
100uS
1mS
MINMAX
10mS
100mS
4
100
100
90
90
Efficiency (%)
Efficiency (%)
MEW1000 Series
80
70
80
70
60
60
50
50
40
40
Nom
Low
Nom
Low
High
Input Voltage (V)
Input Voltage (V)
Efficiency vs Input Voltage ( Single Output )
Efficiency vs Input Voltage ( Dual Output )
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
High
60
50
60
50
40
40
30
30
20
20
10
20
40
60
100
80
10
20
40
60
80
100
Load Current(%)
Load Current(%)
Efficiency vs Output Load ( Single Output )
Efficiency vs Output Load ( Dual Output )
100
Output Power (%)
400LFM
100LFM
80
200LFM
Natural
convection
60
40
20
0
～
-40
50
60
70
90
80
Ambient Temperature
100
110
]
Derating Curve
5
MINMAX
REV:3 2008/10/02
MEW1000 Series
Test Configurations
Maximum Capacitive Load
Input Reflected-Ripple Current Test Setup
The MEW1000 series has limitation of maximum
connected capacitance on the output.
The power module may operate in current limiting mode
during start-up, affecting the ramp-up and the startup time.
The maximum capacitance can be found in the data sheet.
Input reflected-ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0[ at 100 kHz) to
simulated source impedance.
Capacitor Cin, offsets possible battery impedance.
Current ripple is measured at the input terminals of the
module, measurement bandwidth is 0-500KHz.
To Oscilloscope
+
+
Battery
+Vin
Lin
Cin
-Vin
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.
+Out
DC / DC
Converter
Current
Probe
Load
-Out
Input Source Impedance
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
+Out
Single Output
DC / DC
Converter
-Vin
Copper Strip
Cout
Scope
Overcurrent Protection
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
on the input to insure startup.
By using a good quality low Equivalent Series Resistance
(ESR < 1.0[ at 100 kHz) capacitor of a 1.5uF for the 24V and
48V devices, capacitor mounted close to the power module
helps ensure stability of the unit.
Resistive
Load
+
DC Power
Source
-Out
+Vin
+
DC / DC
Converter
+Out
Dual Output
DC / DC
Converter
Com.
-Vin
-Out
Load
Cin
-
+Vin
+Out
-Vin
-Out
Copper Strip
Cout
Scope
Cout
Scope
Output Ripple Reduction
Resistive
Load
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 that 3.3uF
capacitors are used on output.
Design & Feature Considerations
Remote On/Off
Negative logic remote on/off turns the module off during a
logic high voltage on the remote on/off pin, and on 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 high is 2.9V to 15V.
A logic low is under 0.6 VDC or open circuit, drops down to
0VDC by 2mV/]
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 =(under 0.6VDC or open circuit) is 1mA.
REV:3 2008/10/02
+
+Vin
Single Output
DC / DC
Converter
DC Power
Source
-
-Vin
+
+Vin
-
Cout
-Vin
Load
-Out
+Out
Dual Output
DC / DC
Com.
Converter
DC Power
Source
MINMAX
+Out
-Out
Cout
Load
6
MEW1000 Series
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 90° C.
The derating curves were determined from measurements
obtained in an experimental apparatus.
Position of air velocity
probe and thermocouple
15mm / 0.6in
5
50mm / 2in
Air Flow
DUT
MINMAX
REV:3 2008/10/02
MEW1000 Series
Physical Characteristics
3.2[0.13]
12.45[0.49]
Mechanical Dimensions
2.54
2.03[0.08]
7.62[0.300]
[0.100]
25.95*9.25*12.45 mm
Case Size
:
Case Material
:
Non-Conductive Black Plastic
Weight
:
6.5g
Flammability
:
UL94V-0
1.02*0.36*0.49 inches
9.25[0.36]
2.54[0.100]X8=20.32[0.80]
2
3
6
7
8
9
2.75[0.11]
1
0.3[0.012]
25.95[1.02]
0.5[0.02]
Tolerance
Pin
Millimeters
Inches
X.X{0.25
X.XX{0.01
X.XX{0.13
X.XXX{0.005
{0.05
{0.002
Pin Connections
Pin
Single Output
Dual Output
1
-Vin
-Vin
2
+Vin
+Vin
3
Remote On/Off
Remote On/Off
6
+Vout
+Vout
7
NC
Common
8
NC
NC
9
-Vout
-Vout
NC: No Connection
REV:3 2008/10/02
MINMAX
8