MDW48S12-1670 - Wall Industries

TECHNICAL DATASHEET
Rev A
MDW48S12-1670
20W DC/DC Converter
18-75 VDC Input
12 VDC Single Output at 1670mA
Features:
UL
TUV
CB
CE MARK (Pending)
Applications:
•
RoHS Directive Compliant
•
1.67A Single Output Current
•
No Minimum Load Requirement
•
20 Watts Output Power
•
Adjustable Output Voltage
•
High Efficiency up to 87%
•
Low Profile: 2.00 x 1.00 x 0.40 Inches
•
Input to Output Isolation: 1600VDC min
•
4:1 Ultra Wide Input Voltage Range
•
Fixed Switching Frequency
•
Computer Equipment
•
Input Under Voltage Protection
•
Communications Equipment
•
Output Over Voltage Protection
•
Distributed Power Architectures
•
Over Current Protection, Auto-Recovery
•
Output Short Circuit Protection
Options:
•
Remote ON/OFF Control
•
Negative Remote ON/OFF
•
Six-Sided Shielding
•
Heatsinks Available for Extended Operation
•
Case Grounding
Description:
The MDW48S12-1670 is a single output DC/DC converter that provides 20 watts of output power
in a low profile 2 x 1 x 0.4 inch package. The MDW48S12-1670 features a 4:1 wide input voltage
range of 18-75VDC as well as positive or negative remote on/off, 1600VDC I/O isolation, trimmable
output voltage, and six-sided shielding. This converter is also protected against over current, over
voltage, input under voltage, and short circuit conditions. The MDW48S12-1670 is particularly
suited for telecommunications, industrial, mobile telecom, and test equipment applications.
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Page 1 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
Technical Specifications
MDW48S12-1670
Model No.
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
INPUT (Vin)
Operating Voltage Range
UVLO Turn-on Threshold
UVLO Turn-off Threshold
Input Standby Current
Input Current
Input Voltage
Input Voltage Variation
Reflected Ripple Current
Start Up Time
(Nominal Vin and constant resistive load)
OUTPUT (Vo)
Output Voltage Range
Load Regulation
Line Regulation
Voltage Adjustability (see page 5)
Output Ripple & Noise (20MHz)
Output Current
Output Voltage Overshoot
PROTECTION
Over Voltage Protection
Over Current Protection
Short Circuit Protection
DYNAMIC LOAD RESPONSE
Peak Deviation
Setting Time (Vout < 10% peak deviation)
REMOTE ON/OFF
Negative Logic (Option)
Positive Logic (Standard)
Related condition
ISOLATION
Isolation Voltage (Input-Output)
Isolation Voltage (Output to Case)
Isolation Voltage (Input to Case)
Isolation Resistance
Isolation Capacitance
ENVIRONMENTAL
Operating Ambient Temperature (with derating)
Operating Case Temperature
Storage Temperature
Temperature Coefficient
MTBF
Bellcore TR-NWT-000332, TC=40°C
MIL-HDBK-217F
MECHANICAL
Weight
Nominal Vin and Full Load; Ta = 25°C
0% to 100% Full Load
LL to HL at Full Load
Max
Unit
18
48
18
15
15
75
Vdc
Vdc
Vdc
mA
mA
503
75
100
5
20
11.88
-0.5
-0.2
-10
Measured with a 0.1µF/50V MLCC
(See the Test Setup section - pg 9)
12
0
0
Zener diode clamp
Test at nominal Vin and 25°C
Load step change from 75 to 100% or 100 to 75 % of FL
Load step change from 75 to 100% or 100 to 75 % of FL
The ON/OFF pin voltage is referenced to -Vin
(See the Remote ON/OFF Control section - pg 6)
DC/DC ON
DC/DC OFF
DC/DC ON
DC/DC OFF
Vdc
V/ms
mApk-pk
20
20
ms
12.12
+0.5
+0.2
+10
Vdc
%
%
%
75
LL to HL at Full Load and 25°C
mVpk-pk
1670
5
mA
% Vout
15
Vdc
150
% FL
Hiccup, automatic-recovery
200
250
0
3
3
0
mV
µs
1.2
12
12
1.2
2.5
-0.5
Nominal Vin, and full load; Ta=25°C
(See the Test Setup section – pg 9)
0.5
-40
-55
-0.02
Vdc
Vdc
mA
mA
400
KHz
87
%
1600
1600
1600
1
1500
Vdc
Vdc
Vdc
GΩ
pF
105
105
125
+0.02
°C
°C
°C
% / °C
See the MTBF and Reliability section (pg 13)
1,621,000
hours
659,000
hours
See Figure 1
27 grams
2.00 x 1.00 x 0.40 inches
50.8 x 25.4 x 10.2 mm
Dimensions
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Nom
Nominal Vin and No Load
Nominal Vin and Full Load
Continuous
Transient (100ms)
Complies with ETS300 132 part 4.4
5 to 20MHz, 12µH source impedance
(See the Test Setup section - pg 9)
Power Up
Remote On/Off
Remote OFF Input Current
Input Current of Remote Control Pin
GENERAL
Switching Frequency
Efficiency
Min
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Page 2 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
Figure 1: Mechanical Dimensions
Unit: inches (mm)
1.00 (25.4)
0.50
(12.7)
0.400
(10.16)
0.40
(10.2)
PIN CONNECTION
DIA. 0.04 (1.0)
0.400
(10.16)
4
1
5
2
6
0.800 (20.32)
2.00 (50.8)
3
PIN
SINGLE OUTPUT
1
+ INPUT
2
- INPUT
3
+OUTPUT
4
TRIM
5
-OUTPUT
6
CTRL
EXTERNAL OUTPUT TRIMMING
0.60 (15.2)
Output can be externally trimmed by using the
method shown below.
0.100 (2.54)
0.22 (5.6)
0.200 (5.08)
1. Tolerance: X.XX±0.02 (X.X±0.5)
X.XXX±0.01 (X.XX±0.25)
2. Pin pitch tolerance ±0.01 (0.25)
3. Pin dimension tolerance: ±0.014 (0.35)
Equip Heatsink (7G-0020C-F) for lower temperature and higher reliability of the module. Consider space and
airflow in order to choose which heatsink is needed.
Figure 2
Unit: inches (mm)
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Page 3 of 14
TECHNICAL DATASHEET
Rev. A
MDW48S12-1670
DESIGN CONSIDERATIONS:
Output Over Current Protection
When excessive output current occurs in the system, circuit protection is required on all power supplies. Normally,
overload current is maintained at approximately 140% of rated current for the MDW single output series.
Hiccup mode is a method of operation in a power supply whose purpose is to protect the power supply from being
damaged during an over-current fault condition. It also enables the power supply to restart when the fault is
removed. There are other ways of protecting the power supply when it is over loaded such as maximum current
limiting or current fold-back methods.
One of the problems resulting from over current is that excessive heat may be generated in power devices;
especially MOSFET and Schottky diodes and the temperature of those devices may exceed their specified limits. A
protection mechanism has to be used to prevent those power devices from being damaged.
The operation of hiccup is as follows. When the current sense circuit sees an over current event, the controller
shuts off the power supply for a given time and then tries to start up the power supply again. If the over load
condition has been removed, the power supply will start up and operate normally; otherwise, the controller will see
another over current event and shut off the power supply again repeating the previous cycle. Hiccup operation has
none of the drawbacks of the other two protection methods, although its circuit is more complicated because it
requires a timing circuit. The excess heat due to over load lasts for only a short duration in the hiccup cycle, hence
the junction temperature of the power devices is much lower.
The hiccup operation can be done in various ways. For example, one can start the hiccup operation any time an
over current event is detected, or prohibit hiccup during a designated start-up which is usually larger than during
normal operation and it is easier for an over current event to be detected, or prohibit hiccup during a designated
start-up interval (usually a few milliseconds). The reason for the latter operation is that during start-up the power
supply needs to provide extra current to charge up the output capacitor thus the current demand is usually larger
than during normal operation making it easier for an over current event to occur. If the power supply starts to
hiccup once there is over current it might never start up successfully. Hiccup mode protection will give the best
protection for a power supply against over current situations since it will limit the average current to the load at a
low level reducing power dissipation and case temperature in the power devices.
Output Over Voltage Protection
The output over voltage protection consists of an output Zener diode that monitors the voltage on the output
terminals. If the voltage on the output terminals exceeds the over voltage protection threshold, then the Zener diode
will clamp the output voltage.
Short Circuit Protection
Continuous, hiccup, and auto-recovery mode. The average current during this condition will be very low and the
device is still safe in this condition.
Input Source Impedance
The power module should be connected to a low impedance input source. Highly inductive source impedance can
affect the stability of the power module. Input external L-C filter is recommended to minimize input reflected
ripple current. The inductor is simulated source impedance of 12µH and capacitor is Nippon chemi-con KZE series
220µF/100V. The capacitor must be connected as close as possible to the input terminals of the power module for
lower impedance.
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Page 4 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
Thermal Consideration
The power module operates in a variety of thermal environments. However, sufficient cooling should be provided
to help ensure reliable operation of the unit. Heat is removed by conduction, convention, and radiation to the
surrounding environment. Proper cooling can be verified by measuring the point as the figure below. The
temperature at this location should not exceed 105°C. When operating, adequate cooling must be provided to
maintain the test point temperature at or below 105°C. Although the maximum point temperature of the power
modules is 105°C, you can limit this temperature to a lower value for extremely high reliability.
Figure 3
Measurement shown in inches (mm)
Output Voltage Adjustment
Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of a
module. This is accomplished by connecting an external resistor between the TRIM pin and either the +Vout or
-Vout pins. With an external resistor between the TRIM and -Vout pin, the output voltage set point increases. With
an external resistor between the TRIM and +Vout pin, the output voltage set point decreases.
Figure 4
Table 1
MDW48S12-1670
(888) 597-WALL
Trim
Trimup
Rup
Trimdown
Rdown
1%
12.120V
367.908 kΩ
11.880V
460.992 kΩ
2%
12.240V
165.954 kΩ
11.760V
207.946 kΩ
3%
12.360V
98.636 kΩ
11.640V
123.597 kΩ
4%
12.480V
64.977 kΩ
11.520V
81.423 kΩ
5%
12.600V
44.782 kΩ
11.400V
56.118 kΩ
6%
12.720V
31.318 kΩ
11.280V
39.249 kΩ
7%
12.840V
21.701 kΩ
11.160V
27.199 kΩ
8%
12.960V
14.488 kΩ
11.040V
18.162 kΩ
9%
13.080V
8.879 kΩ
10.920V
11.132 kΩ
10%
13.200V
4.391 kΩ
10.800V
5.509 kΩ
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Page 5 of 14
TECHNICAL DATASHEET
Rev. A
MDW48S12-1670
Remote ON/OFF Control
The remote ON/OFF pin allows the user to turn the DC/DC power module on and off from a remote switch device.
The ON/OFF input can be switched by a number of switching devices. Figure 5 gives several examples of
acceptable configurations. The remote ON/OFF pin is an open collector/drain logic input signal that is referenced
to –Vin. A logic High on the remote ON/OFF pin turns the module ON and a logic Low on the remote ON/OFF
pin turns the module OFF. If the remote ON/OFF feature is not being used please make an open circuit between
the ON/OFF pin and the –input pin to turn the module on.
Remote ON/OFF Implementation
Figure 5
Isolated-Closure Remote ON/OFF
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Level Control Using TTL Output
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Level Control Using Line Voltage
Page 6 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
MDW48S12-1670 Graphs. All test conditions are at 25°C
Graph 2: Efficiency vs. Input Voltage (Full Load)
Efficiency (%)
Efficiency (%)
Graph 1: Efficiency vs. Output Current
Input Voltage (V)
% Of Full Load
Graph 4: Output Power vs. Ambient Temperature with
Heatsink & Airflow (Nominal Vin)
Output Power (%)
Output Power (%)
Graph 3: Output Power vs. Ambient Temperature & Airflow
(Nominal Vin)
Ambient Temperature, Ta (°C)
Ambient Temperature, Ta (°C)
Graph 6: Typical Output Ripple and Noise
(Nominal Vin and Full Load)
Power Dissipation (W)
Graph 5: Power Dissipation Vs. Output Current
% Of Full Load
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Page 7 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
MDW48S12-1670 Graphs (Continued). All test conditions are at 25°C
Graph 7: Typical Input Start-Up and Output Rise Characteristic
(Nominal Vin and Full Load)
Graph 9: Transient Response to Dynamic Load Change from
100% to 75% to 100% of Full Load at Nominal Vin
Graph 8: Using ON/OFF Voltage Start-Up and Vo Rise
Characteristic (Nominal Vin and Full Load)
Graph 10: Conducted Emission of EN55022 Class A
(Nominal Vin and Full Load)
Frequency (MHz)
Graph 11: Conducted Emission of EN55022 Class B
(Nominal Vin and Full Load)
Frequency (MHz)
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Page 8 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
TEST SETUP:
The MDW48S12-1670 specifications are tested with the following configurations:
Input Reflected-Ripple Current Measurement Test Setup
Figure 6
Component
Value
Voltage
L
12µH
----
C
100µF
100V
Reference
---Aluminum Electrolytic Capacitor
Peak-to-Peak Output Ripple & Noise Measurement Setup
Figure 8
Figure 7
Output Voltage and Efficiency Measurement Setup
Figure 9
 Vout × Iout 
Efficiency = 
 × 100%
 Vin × Iin 
NOTE: All measurements are taken at the module terminals
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Page 9 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
EMC Considerations
Suggested Schematic for EN55022 Conducted Emission Class A Limits
Figure 10
Recommended Layout with Input Filter
Figure 11
The following components are needed to meet conducted emissions EN55022 Class A
MDW24Sxx-xxxx
Component
C1
C2, C3
Value
--1000pF
Voltage
--2KV
Reference
--1808 MLCC
MDW48Sxx-xxxx
Component
C1
C2, C3
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Value
1µF
1000pF
Voltage
100V
2KV
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Reference
1210 MLCC
1808 MLCC
Page 10 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
EMC Considerations (Continued)
Suggested Schematic for EN55022 Conducted Emission Class B limits
Figure 12
Recommended Layout with Input Filter
Figure 13
The following components are needed to meet conducted emissions EN55022 Class B
Figure 14: Common Choke (L1)
MDW24Sxx-xxxx
Component
Value
Voltage
Reference
C1
4.7µF
50V
1812 MLCC
C3, C4
1000pF
2KV
1808 MLCC
L1
450µF
---
Common Choke, P/N: PMT-048
MDW48Sxx-xxxx
Component
Value
Voltage
Reference
C1, C2
2.2µF
100V
1812 MLCC
C3, C4
1000pF
2KV
1808 MLCC
L1
325µF
---
Common Choke, P/N: PMT-050
PMT-048
Dimensions: mm
L: 450µH±35% / DCR: 25Ω, max
Height: 9.8mm, max.
Test conditions: 100KHz / 100mV
Recommended through hole: Φ0.8mm
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PMT-050
Dimensions: mm
L: 325µH±35% / DCR: 35Ω, max
Height: 8.8mm, max.
Test conditions: 100KHz / 100mV
Recommended through hole: Φ0.8mm
Page 11 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
Recommended Pad Layout
Figure 15
1. All dimensions in inches (mm)
2. Tolerance: X.XX±0.02 (X.X±0.5)
X.XXX±0.01 (X.XX±0.25)
3. Pin Pitch Tolerance: ±0.01(0.25)
Soldering and Reflow Considerations:
Lead Free Wave Solder Profile for MDW Single Output Models
Figure 16
TEMPERATURE (°C)
Zone
Preheat Zone
Actual Heating
Reference Parameter
Rise temp. speed: 3°C/sec max.
Preheat temp: 100~130°C
Peak temp: 250~260°C
Peak time (T1+T2 time): 4~6 sec
Reference Solder: Sn-Ag-Cu; Sn-Cu
Hand Welding: Soldering Iron: Power 90W
Welding Time: 2~4 sec
Temp: 380~400°C
TIME (SEC)
Packaging Information:
Figure 17
Unit: mm
20 PCS per Tube
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Page 12 of 14
TECHNICAL DATASHEET
MDW48S12-1670
Rev. A
Safety and Installation Instructions:
Fusing Consideration
Caution: This power module is not internally fused. An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone
operation to an integrated part of sophisticated power architecture. For maximum flexibility internal fusing is not
included; however, to achieve maximum safety and system protection always use an input line fuse. The safety
agencies require a normal-blow fuse with maximum rating of 6A. Based on the information provided in this data
sheet on inrush energy and maximum DC input current; the same type of fuse with lower rating can be used. Refer
to the fuse manufacturer’s data for further information.
MTBF and Reliability
The MTBF of the MDW single output series of DC/DC converters has been calculated using Bellcore
TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled environment).
The resulting figure for MTBF is 1,621,000 hours.
MIL-HDBK 217F NOTICE2 FULL LOAD, Operating Temperature at 25°C. The resulting figure for MTBF is
659,000 hours.
Ordering Information:
Part Number Example:
MDW
48
S
12
-
1670
R
Series
Designation
Nominal
Input Voltage
Single Output
Nominal
Output Voltage
Output Current
Suffix
Blank
R
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Option
Positive Remote ON/OFF (standard)
Negative Remote ON/OFF
Page 13 of 14
TECHNICAL DATASHEET
Rev. A
MDW48S12-1670
Company Information:
Wall Industries, Inc. has created custom and modified units for over 40 years. Our in-house research and
development engineers will provide a solution that exceeds your performance requirements on time and on budget.
Our ISO9001-2000 certification is just one example of our commitment to producing a high quality, welldocumented 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:
(888) 597-WALL
(603)778-2300
(888)587-9255
(603)778-9797
[email protected]
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
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Page 14 of 14