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Rev A
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
FEATURES
● Soft Start
● Output Trim
● Single Output
● 1500VDC Isolation
● Efficiency up to 89%
● Remote On/Off Control
● MTBF > 1,000,000 Hours
● CSA1950 Safety Approval
● 4:1 Wide Input Voltage Range
● Complies with EN55022 Class A
● Call Factory for More Output Power Options
● Short Circuit, Over Voltage, and Over Temperature Protected
● Chassis Mount Options: Open Frame, U Channel, and Enclosed Types Available
DESCRIPTION
The CMMMW series of chassis mount DC/DC converters offers up to 30 watts of output power. These converters operate over input
voltage ranges of 10-40VDC and 18-75VDC. This series also provides regulated single outputs of 3.3, 5, 12, and 15VDC. Other features
include remote on/off control, output trim function, and efficiencies up to 89%. All models are over voltage, over temperature and short
circuit protected. The EN55022 Class A conducted noise compliance minimizes design time, cost, and eliminates the need for external filter
components. These converters are best suited for data communication equipment, mobile battery driven equipment, distributed power
systems, telecommunications equipment, mixed analog/digital subsystems, process/machine control equipment, computer peripheral
systems, and industrial robot systems. Chassis mounts come in open frame, U channel, and enclosed types.
SPECIFICATIONS: CMMMW Series
All specifications are based on 25°C, Nominal Input Voltage, and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
TEST CONDITIONS
Min
Nom
Max
Unit
INPUT (Vin)
24V nominal input models
10
24
40
VDC
Input Voltage Range
48V nominal input models
18
48
75
VDC
24V nominal input models
9.4
9.7
10
VDC
Start Voltage
48V nominal input models
17
17.5
18
VDC
24V nominal input models
9
9.3
9.5
VDC
Under Voltage Shutdown
48V nominal input models
16
16.5
17
VDC
Reverse Polarity Input Current
All models
2
A
Short Circuit Input Power
4500
mW
24V nominal input models
-0.7
50
VDC
Input Surge Voltage
48V nominal input models
-0.7
100
VDC
OUTPUT (Vo)
Output Voltage
See Table
Output Voltage Accuracy
±0.5
±1.0
%
Output Trim
% of nominal output
±9.0
±10.0
±11.0
%
Load Regulation
Io = 50% to 100%
±0.3
±1.0
%
Line Regulation
Vin = min. to max.
±0.2
±0.5
%
Output Power
30
W
Output Current Range
See Table
Ripple & Noise (20MHz)
55
80
mVpk-pk
Ripple & Noise (20MHz)
Over Line, Over Load, and Over Temperature
100
mVpk-pk
Ripple & Noise (20MHz)
10
mVrms
Transient Recovery Time
25% load step change
150
300
μs
Transient Response Deviation
±2
±4
%
Temperature Coefficient
±0.01
±0.02
%/°C
REMOTE ON/OFF
Supply On
2.5 to 100VDC or Open Circuit
Supply Off
-1
1
VDC
Standby Input Current
2
5
mA
Control Input Current (On)
Vin – RC = 5.0V
5
μA
Control Input Current (Off)
Vin – RC = 0V
-100
μA
Control Common
Referenced to negative input
PROTECTION
Over Power Protection
120
180
%
Short Circuit Protection
Continuous
Over Voltage Protection
See Table
Over Temperature Protection
Case Temperature, automatic
107
112
117
°C
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
Rev A
SPECIFICATION
GENERAL
Efficiency
Switching Frequency
Isolation Voltage Rated
Isolation Voltage Test
Isolation Resistance
Isolation Capacitance
Internal Power Dissipation
Max. Capacitive Load
ENVIRONMENTAL
Operating Temperature (Ambient)
Operating Temperature (Case)
Storage Temperature
Lead Temperature
Humidity
Cooling
RFI
MTBF
Conducted EMI
PHYSICAL
Weight
Dimensions (L x W x H)
Case Material of DC/DC Cnverter
Flammability
TEST CONDITIONS
Min
290
1500
1650
1000
60 seconds
Flash Test for 1 second
500VDC
100KHz, 1V
Nom
Max
Unit
See Table
330
360
KHz
VDC
VDC
MΩ
pF
mW
1200
1500
5,500
See Table
-40
-40
-50
1.5mm from case for 10 seconds
MIL-HDBK-217F @ 25°C, Ground Benign
+50
°C
+105
°C
+125
°C
260
°C
95
%
Free air convection
Six-sided shielding, metal case
1000
Khours
EN55022 Class A
Approximately 7oz
4.00 x 2.25 x 0.81 inches
Metal with non-conductive baseplate
UL94V-0
MODEL SELECTION TABLE
Model Number
Input Voltage
CMMMW24S3.3-5500
CMMMW24S5-5000
24 VDC
Output
Voltage
Output Current
Min
Max
3.3 VDC
400 mA
5500 mA
5 VDC
350 mA
5000 mA
Input Current
Reflected
No Load Max Load Ripple Current
922 mA
1225 mA
20 mA
CMMMW24S12-2500
Efficiency Over Voltage
Maximum
(Typ)
Protection
Capacitive Load
82%
3.9 VDC
10000 μF
85%
6.8 VDC
10000 μF
15 VDC
1000 μF
50 mA
12 VDC
166 mA
2500 mA
1404 mA
89%
CMMMW24S15-2000
15 VDC
133 mA
2000 mA
1404 mA
89%
18 VDC
1000 μF
CMMMW48S3.3-5500
3.3 VDC
400 mA
5500 mA
461 mA
82%
3.9 VDC
10000 μF
5 VDC
350 mA
5000 mA
85%
6.8 VDC
10000 μF
CMMMW48S5-5000
(10 ~ 40 VDC)
48 VDC
613 mA
10 mA
CMMMW48S12-2500
CMMMW48S15-2000
(18 ~ 75 VDC)
25 mA
12 VDC
166 mA
2500 mA
702 mA
89%
15 VDC
1000 μF
15 VDC
133 mA
2000 mA
702 mA
89%
18 VDC
1000 μF
NOTES
1. Transient recovery time is measured to within 1% error band for a step change in output load of 75% to 100%.
2. The CMMMW series requires a minimum output loading to maintain specified regulations. Operation under no-load
conditions will not damage these devices, however they may not meet all listed specifications.
3. Other input and output voltages may be available, please contact factory.
4. Heatsink is optional. Please consult factory for ordering details.
5. Chassis Mount Options: No suffix for open frame, “U” suffix for U Channel, and “E” suffix for Enclosed type.
Due to advances in technology, specifications subject to change without notice.
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
Rev A
BLOCK DIAGRAM
INPUT VOLTAGE TRANSIENT RATING
Single Output
150
140
130
48VDC Input Models
110
100
Vin ( VDC )
+Vin
120
+Vo
LC
Filter
-Vo
OVP
OTP
90
80
24VDC Input Models
70
60
50
OVP
40
30
-Vin
20
PWM
On/Off
Isolation
Ref.Amp
10
Trim
0
10uS
100uS
1mS
10mS
100mS
EFFICIENCY GRAPHS
Efficiency vs Input Voltage (Single Output)
Efficiency vs Output Load (Single Output)
100
100
90
Efficiency (%)
80
70
80
70
60
50
60
50
40
30
Low
Nom
High
10
20
40
60
Load Current (%)
Input Voltage (V)
DERATING CURVE
100
400LFM
80
Output Power (%)
Efficiency (%)
90
Natural
convection
60
100LFM
200LFM
40
20
0
~
¡ã
-40
50
60
70
80
90
Ambient Temperature (°C)
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
100
110
80
100
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
Rev A
MECHANICAL DRAWING
Unit: inches [mm]
TRM
+ Out
-Out
-Vin
CNTL
+ Vin
4.00 [101.6]
MODEL NAME
LABEL
2.25 [57.2]
.17 [4.3]
1.13 [28.6]
3.66 [93.0]
.16 [4.06] 2X
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
.81 [20.6]
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
Rev A
DESIGN & FEATURE CONSIDERATIONS
Over Current 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.
Over Voltage Protection
The output over voltage clamp consists of control circuitry that is dependent on the primary regulation loop that monitors the
voltage on the output terminals. The control loop of the clamp has a higher voltage set point than the primary loop. This
provides a redundant voltage control that reduces the risk of an output over voltage. The OVP level can be found in the
protection specifications.
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. A 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 100KHz)
capacitor of a 33μF for the 24V input models and a 10μF for the 48V input models.
+
DC Power
Source
-
+Vin
+
+Out
DC / DC
Converter
Load
Cin
-Vin
-Out
Remote On/Off
Positive logic remote on/off turns the module on during a logic high voltage on the remote on/off pin, and turns the module 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 -1V to 1.0V.
A logic high is 2.5V to 100V.
The maximum sink current at the on/off terminal (pin 4) during a logic low is -100μA. The maximum allowable leakage
current of the switch at the on/off terminal (pin 4) during a logic high (2.5 to 100V) is 5μA.
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
Rev A
Output Voltage Trim
Output voltage trim allows the user to increase or decrease the output voltage set point of a module. The output voltage can
be adjusted by placing an external resistor (R) between the Trim and +Vout or –Vout terminals. By adjusting R, the output
voltage can be changed by ±10% of the nominal output voltage.
+Vin
+Out
-Vin
-Out
Trim Down
Trim
Up/Down
Trim Up
Enable
10K
Trim
A 10K, 1 or 10 turn trimpot is usually specified for continuous trimming. Trim pin may be safely left floating if it is not being
used. Connecting the external resistor (Rup) between the Trim and –Vout pins increases the output voltage to set the point as
defined in the following equation:
(33 x Vout) - (30 x Vadj)
Rup =
Vadj - Vout
Connecting the external resistor (Rdown) between the Trim and +Vout pins decreases the output voltage set point as defined
in the following equation:
Rdown =
Vout:
Vadj:
Units
(36.667 x Vadj) - (33 x Vout)
Vout - Vadj
Nominal Output Voltage
Adjusted Output Voltage
VDC / KΩ
Maximum Capacitive Load
The CMMMW Series has a 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 330μF maximum capacitive load for 12V and 15V outputs and 10,000μF capacitive load for 3.3V and 5V outputs.
The maximum capacitance can be found in the Output Voltage / Current Rating Chart.
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin (4.7μH) and Cin (220μF, ESR < 1.0Ω at 100KHz) 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 ~ 500KHz.
To Oscilloscope
+
Battery
+
+Vin
Lin
Cin
Current
Probe
+Out
DC / DC
Converter
-Vin
Load
-Out
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
Rev A
Peak-to-Peak Output Noise Measurement Test
Use a Cout 1.0μF ceramic capacitor.
Scope measurement should be made by using a BNC socket; measurement bandwidth is 0 ~ 20MHz. Position the load
between 50mm and 75mm from the DC/DC Converter.
+Vin
+Out
Copper Strip
Single Output
DC / DC
Converter
-Vin
+Vin
Resistive
Scope
Load
Cout
-Out
Copper Strip
+Out
Scope
Cout
Dual Output
DC / DC
Converter
Com.
-Vin
-Out
Resistive
Load
Cout
Scope
Output Ripple Reduction
A good quality low ESR capacitor placed as close as possible across the load will give the best ripple and noise performance.
To reduce output ripple, it is recommended to use 4.7μF capacitors at the output.
+
+Vin
Single Output
DC / DC
Converter
DC Power
Source
-
+Out
-Vin
+
+Vin
Dual Output
DC / DC
Com.
Converter
DC Power
Source
Cout
Load
-Out
+Out
-
-Vin
-Out
Cout
Load
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 105°C. The derating curves are determined from measurements obtained in an experimental
apparatus.
Position of air velocity
probe and thermocouple
15mm / 0.6in
50mm / 2in
Air Flow
DUT
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Rev A
CMMMW Series
4:1 Input Voltage Ranges
18~30 Watt, Single Output
Chassis Mount DC/DC Converter
COMPANY INFORMATION:
Wall Industries, Inc. has created custom and modified units for over 50 years. Our in-house research and development
engineers will provide a solution that exceeds your performance requirements on time and on budget. Our ISO9001-2008
certification is just one example of our commitment to producing a high quality, well documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working
closely with its customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to
provide ongoing support for your project above and beyond the design and production phases. Give us a call today to
discuss your future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
(603)778-2300
(888)587-9255
(603)778-9797
sales@wallindustries.com
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797