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TECHNICAL DATASHEET
Rev B
JFCW48D12-625
15W DC/DC Converter
18-75 VDC Input
±12 VDC Dual Output at ±625mA
Features:
Applications:





UL
TUV
CB
CE MARK (Pending)
Measurement
Telecom/Datacom
Wireless Networks
Industry Control Systems
Semiconductor Equipment
Options:



Negative Remote ON/OFF
ON/OFF Control Function
Heatsinks Available for Extended Operation

RoHS Directive Compliant

±625mA Dual Output Current

Industry Standard Pin-out

No Minimum Load Requirement

15 Watts Output Power

High Efficiency up to 86%

Low Profile: 1.0 x 1.0 x 0.39 Inches

Input to Output Isolation: 1600VDC min

4:1 Ultra Wide Input Voltage Range

Fixed Switching Frequency

Input Under Voltage Protection

Output Over Voltage Protection

Over Current Protection, Auto-Recovery

Output Short Circuit Protection

Remote ON/OFF Control

Six-Sided Shielding
Description:
The JFCW48D12-625 is a dual output DC/DC converter that provides 15 watts of output power in
an industry standard package and footprint. The JFCW48D12-625 is specifically designed to meet
power needs in a low profile package. This model features a 4:1 wide input voltage range of 1875VDC as well as positive or negative remote on/off, 1600VDC I/O isolation, and a fixed switching
frequency. This converter is also protected against over current, over voltage, input under voltage,
and short circuit conditions.
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Page 1 of 14
Rev. B
TECHNICAL DATASHEET
Technical Specifications
JFCW48D12-625
JFCW48D12-625
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
Cross Regulation
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
Operating Case Temperature
Storage Temperature
Temperature Coefficient
MTBF
Bellcore TR-NWT-000332, TC=40°C
MIL-STD-217F
MECHANICAL
Weight
Nominal Vin and Full Load; Ta = 25°C
0% to 100% Full Load
LL to HL at Full Load
Asymmetrical load 25%/ 100% of full load
Measured with a 1μF M/C and a 10μF T/C
(See the Test Setup section - pg 9)
Max
Unit
18
48
75
18
Vdc
Vdc
Vdc
mA
mA
16
15
382
75
100
5
30
11.88
-1.0
-0.5
-5
12
0
LL to HL at Full Load and 25°C
voltage clamped
Test at nominal Vin
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 (Short)
DC/DC OFF (Open)
DC/DC ON (Open)
DC/DC OFF (Short)
0
13.5
0
3
3
0
mApk-pk
ms
12.12
+1.0
+0.5
5
Vdc
%
%
%
100
mVpk-pk
±625
3
mA
% Vout
mV
μs
1.2
15
15
1.2
2.5
1.0
Vdc
mA
mA
kHz
86
%
1000
-55
-0.02
Vdc
400
1600
1000
1000
1
-40
V/ms
30
30
300
250
Nominal Vin, and full load; Ta=25°C
(See the Test Setup section - pg 9)
Vdc
19.6
Vdc
150
% FL
Hiccup, automatic-recovery
-0.5
85
105
125
+0.02
Vdc
Vdc
Vdc
GΩ
pF
o
C
C
o
C
% / oC
o
See the MTBF and Reliability section (pg 13)
1,330,000
hours
563,000
hours
See Figure 1
15 grams
1.0 x 1.0 x 0.39 inches
25.4 x 25.4 x 9.9mm
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
Rev. B
TECHNICAL DATASHEET
JFCW48D12-625
Figure 1: Mechanical Dimensions
Unit: inches (mm)
PIN CONNECTION
PIN
DUAL OUTPUT
1
+ INPUT
2
- INPUT
3
ON/OFF
4
+VOUT
5
COMMON
6
-VOUT
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: ±0.004 (0.1)
PRODUCT STANDARD TABLE
Option
Negative Remote ON/OFF
Positive Remote ON/OFF
Without ON/OFF pin
Without ON/OFF & TRIM pin
Negative Remote ON/OFF without TRIM pin
Positive Remote ON/OFF without TRIM pin
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Suffix
R
No Suffix
D
G
RF
F
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Page 3 of 14
TECHNICAL DATASHEET
Rev. B
JFCW48D12-625
DESIGN CONSIDERATIONS:
Output Over Current Protection
When excessive output currents occur in the system, circuit protection is required on all power supplies. Normally, overload
current is maintained at approximately 150% of rated current for the JFCW dual 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.
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.
Output Over Voltage Protection
The output over voltage protection consists of an output Zener diode that monitors the output voltage on the feedback loop. If
the voltage on the output terminals exceeds the over voltage protection threshold, then the Zener diode will send a current
signal to the IC to limit 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 C-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 10μF/100V and 10μF/100V.
The capacitor must be connected as close as possible to the input terminals of the power module for lower impedance.
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 2
TOP VIEW
Measurement shown in inches (mm)
TEMPERATURE MEASURING POINT
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Page 4 of 14
Rev. B
TECHNICAL DATASHEET
JFCW48D12-625
Heatsink Consideration
Equip heatsink for lower temperature and higher reliability of the module. Considering space and air-flow is the way to
choose which heatsink is needed.
Figure 3
Unit: inches (mm)
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Page 5 of 14
Rev. B
TECHNICAL DATASHEET
JFCW48D12-625
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 4 gives several examples of acceptable
configurations. The remote ON/OFF switch is activated by the voltage difference between the ON/OFF pin and the –Vin pin
(with –Vin as the reference voltage). The user-supplied switch must be capable of sinking up to 1mA of current at low-level
logic voltage. The leakage current of the user-supplied switch must be 50μA or less at 15Vdc.
Remote ON/OFF Implementation
Figure 4
Isolated-Closure Remote ON/OFF
Level Control Using TTL Output
Level Control Using Line Voltage
There are two remote control options available: Positive logic and Negative logic
a. The positive logic structure turned the DC/DC module ON when the ON/OFF pin is at high-level logic and turned
the DC/DC module OFF when the ON/OFF pin is at low-level logic.
Figure 5
When JFCW module is turned OFF at Low-level logic
When JFCW module is turned ON at High-level logic
b. The negative logic structure turned the DC/DC module ON when the ON/OFF pin is at low-level logic and turned
the DC/DC module OFF when the ON/OFF pin is at high-level logic.
Figure 6
When JFCW module is turned ON at Low-level logic
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When JFCW module is turned OFF at High-level logic
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Page 6 of 14
TECHNICAL DATASHEET
Rev. B
JFCW48D12-625
JFCW48D12-625 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
Rev. B
JFCW48D12-625
JFCW48D12-625 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
Rev. B
JFCW48D12-625
TEST SETUP:
The JFCW48D12-625 specifications are tested with the following configurations:
Input Reflected-Ripple Current Measurement Test Setup
CURRENT PROBE MEASURE POINT
Figure 7
+Vin
L
+
BATTERY
+
C2
C1
-Vin
Component
L
C1
C2
Value
12μH
10μF
10μF
Voltage
---100V
100V
Reference
---Aluminum Electrolytic Capacitor
Aluminum Electrolytic Capacitor
Peak-to-Peak Output Ripple & Noise Measurement Setup
Figure 9
Figure 8
Output Voltage and Efficiency Measurement Setup
Figure 10
 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
Rev. B
JFCW48D12-625
EMC Considerations
Suggested Schematic for EN55022 Conducted Emission Class A Limits
Figure 11
Recommended Layout with Input Filter
Figure 12
The following components are needed to meet conducted emissions EN55022 Class A
JFCW24Dxx-xxxx
Component
C1
C2
C3, C4
Value
6.8μF
6.8μF
470pF
Voltage
50V
50V
3KV
Reference
1812 MLCC
1812 MLCC
1808 MLCC
JFCW48Dxx-xxxx
Component
C1
C2
C3, C4
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Value
2.2μF
2.2μF
470pF
Voltage
100V
100V
3KV
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Reference
1812 MLCC
1812 MLCC
1808 MLCC
Page 10 of 14
Rev. B
TECHNICAL DATASHEET
JFCW48D12-625
EMC Considerations (Continued)
Suggested Schematic for EN55022 Conducted Emission Class B limits
Figure 13
Recommended Layout with Input Filter
Figure 14
The following components are needed to meet conducted emissions EN55022 Class B
Figure 15: Common Choke (L1)
JFCW24Dxx-xxxx
Component
C1, C3
C2
C4, C5
L1
Value
6.8μF
--470pF
325μH
Voltage
50V
--3KV
---
Reference
1812 MLCC
--1808 MLCC
Common Choke
JFCW48Dxx-xxxx
Component
C1, C3
C2
C4, C5
L1
Value
2.2μF
2.2μF
1000pF
325μH
Voltage
100V
100V
3KV
---
Reference
1812 MLCC
1812 MLCC
1808 MLCC
Common Choke
Dimensions: mm
L: 325μH±35% / DCR: 35Ω, max
Height: 8.8mm, max.
Test conditions: 100KHz / 100mV
Recommended through hole: Φ0.8mm
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Page 11 of 14
TECHNICAL DATASHEET
Rev. B
JFCW48D12-625
Recommended Pad Layout
Figure 16
1. All dimensions in inches [mm]
2. Tolerance: x.xxx±0.010 inches
xx.xx±0.25 mm
Pad Size (Lead Free Recommended)
Pin Through Hole: Ø 0.047 in (1.2mm)
Top View Pad: Ø 0.079 in (2.0mm)
Bottom View Pad: Ø 0.118 in (3.0mm)
Soldering and Reflow Considerations:
Lead Free Wave Solder Profile for JFCW-Single Output Models
Figure 17
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 18
300
Unit: mm
26.5
19
10 PCS per Tube
6
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Page 12 of 14
TECHNICAL DATASHEET
Rev. B
JFCW48D12-625
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 3A for JFCW24Dxx-xxx modules and 1.5A for
JFCW48Dxx-xxx. 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 JFCW dualoutput 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 1,330,000 hours.
MIL-HDBK 217F NOTICE2 FULL LOAD, Operating Temperature at 25°C. The resulting figure for MTBF is
563,000 hours.
Ordering Information:
Part Number Example:
JFCW
48
D
12
- 625
R
Series
Designation
Nominal
Input Voltage
Dual Output
Nominal
Output Voltage
Output Current
Suffix
R
No Suffix
D
G
RF
F
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Option
Negative Remote ON/OFF
Positive Remote ON/OFF
Without ON/OFF pin
Without ON/OFF & TRIM pin
Negative Remote ON/OFF without TRIM pin
Positive Remote ON/OFF without TRIM pin
Page 13 of 14
Rev. B
TECHNICAL DATASHEET
JFCW48D12-625
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:
(888) 597-WALL
(603)778-2300
(888)587-9255
(603)778-9797
[email protected]
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5 Watson Brook Rd.
Exeter, NH 03833
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Page 14 of 14
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