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TECHNICAL DATASHEET
Rev. A
JFCW24S3.3-20
4:1 Input Voltage Range: 9-36VDC
3.3VDC Single Output at 4.5A
Industry Standard Package and Footprint
14.85W DC/DC Power Converter
FEATURES
 14.85 Watts Maximum Output Power
 3.3VDC Single Output
 Industry Standard Pin-Out
 Small Size and Low Profile: 1.0” x 1.0” x 0.39”
 4:1 Wide Input Voltage Range: 9-36VDC
 88% High Efficiency
 1600VDC I/O Isolation
 Ultra Low Quiescent Current
 Remote ON/OFF Control
APPLICATIONS




Wireless Networks
Telecom / Datacom
Industry Control Systems
Measurement Equipment
 Semiconductor Equipment
 Adjustable Output Voltage
 Fixed Switching Frequency
 No Minimum Load Requirement
 Input Under Voltage, Over Voltage, Over Current, and Short
Circuit Protected
 Six-Sided Shielding
OPTIONS
 Negative Remote ON/OFF
 Without Trim Pin
 Without ON/OFF Pin
 Heatsink
 EMI Meets EN55022 Class A Without External Filter
 CE Mark Meets 2006/95/EC, 93/68/EEC, and 2004/108/EC
 UL60950-1, EN60950-1, and IEC60950-1 Safety Approvals
 Compliant to RoHS EU Directive 2002/95/EC
DESCRIPTION
The JFCW24S3.3-20 DC/DC power converter provides 14.85 Watts of output power in an industry standard 1.0” x 1.0” x
0.39” package and footprint. This converter has a 3.3VDC single output and operates over a 4:1 input voltage range of 936VDC. The JFCW24S3.3-20 is also protected against short circuit, over current, over voltage, and input under voltage
conditions. Some features include 88% high efficiency, low quiescent current, adjustable output voltage, and positive
(standard) or negative (optional) remote ON/OFF control. This converter is RoHS compliant and has UL60950-1, EN609501, and IEC60950-1 safety approvals.
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Page 1 of 13
TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
TECHNICAL SPECIFICATIONS
SPECIFICATION
INPUT SPECIFICATIONS
Operating Input Voltage Range
Input Voltage
MODEL NO. JFCW24S3.3-20
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.
TEST CONDITIONS
Min
Typ
9
24
Continuous
Transient (1 sec max)
Input Current
Input Standby Current
UVLO Turn-On Threshold
UVLO Turn-Off Threshold
Power Up
Remote ON/OFF
Input Reflected Ripple Current (See Page 9)
Input Filter
OUTPUT SPECIFICATIONS
Output Voltage
Line Regulation
Start-Up Time
Load Regulation
Voltage Adjustability (See Page 5)
Output Power
Output Current
Minimum Load
Output Capacitor Load
Ripple & Noise (20Hz BW) (See Page 9)
Output Voltage Overshoot
Temperature Coefficient
DYNAMIC LOAD RESPONSE
Peak Deviation
Setting Time (Vout < 10% peak deviation)
REMOTE ON/OFF (See Page 6)
DC/DC ON (Open)
Positive Logic (standard)
DC/DC OFF (Short)
DC/DC ON (Short)
Negative Logic (optional)
DC/DC OFF (Open)
Input Current of Remote Control Pin
Remote Off State Input Current
PROTECTION
Over Voltage Protection
Over Current Protection
Short Circuit Protection
GENERAL SPECIFICATIONS
Efficiency
Switching Frequency
Input to Output
Isolation Voltage
Input to Case
Output to Case
Isolation Resistance
Isolation Capacitance
ENVIRONMENTAL SPECIFICATIONS
Operating Ambient Temperature (with derating)
Operating Case Temperature
Storage Temperature
Relative Humidity
Thermal Shock
Vibration
Thermal Impedance (See Page 4~5)
MTBF (See Page 12)
Nominal input and full load
Nominal input and no load
Max
Unit
36
36
50
754
VDC
VDC
mA
mA
VDC
VDC
6
9
8
30
30
Nominal input and constant resistive load
5 to 20MHz, 12µH source impedance
ms
30
mAp-p
Pi type
Nominal input, full load, and 25°C
Low line to high line at full load
0% to 100% full load
10% to 90% load
3.267
-0.2
-0.2
-0.1
-10
3.3
3.333
+0.2
+0.2
+0.1
+10
14.85
4.5
VDC
%
%
%
%
W
A
%
µF
mVp-p
% Vout
%/°C
0
Minimum Vin and constant resistive load
Measured with a 1µF M/C and a 10µF T/C
Low line to high line at full load and 25°C
75
-0.02
Nom.Vin and TA=25°C
Nom.Vin and TA=25°C
75% to 100% or 100% to 75% of full load
75% to 100% or 100% to 75% of full load
350
250
3
0
0
3
-0.5
The CTRL pin is referenced to -Input
The CTRL pin is referenced to -Input
Nominal Input
Nominal Input
7000
100
5
+0.02
mV
µs
15
1.2
1.2
15
1.0
VDC
VDC
mA
mA
2.0
Voltage clamped
% of FL at nominal input
3.7
Nominal input and full load
297
1600
1000
1000
1
For 1 minute
5.4
150
Hiccup, automatic recovery
88
330
VDC
% FL
%
KHz
363
VDC
GΩ
pF
1500
Vertical direction by natural convection (20LFM)
-40
-55
5
Natural Convection
Natural Convection with Heatsink
BELLCORE TR-NWT-000332, TC=40°C
MIL-HDBK-217F
PHYSICAL SPECIFICATIONS
Case Material
Base Material
Potting Material
Weight
Dimensions (L x W x H)
SAFETY & EMI CHARACTERISTICS
Safety Approvals
EMI (See Page 10)
EN55022
ESD
EN61000-4-2
Radiated Immunity
Fast Transient (See Note)
Surge (See Note)
Conducted Immunity
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
+101
+105
+125
95
MIL-STD-810F
MIL-STD-810F
17.6
14.8
1,766,000 hours
553,000 hours
°C
°C
°C
% RH
°C/Watt
Nickel-coated copper
FR4 PCB
Silicon (UL94V-0)
0.53oz (15g)
1.0 x 1.0 x 0.39 inches (25.4 x 25.4 x 9.9 mm)
IEC60950-1, UL60950-1, EN60950-1
Class B
Air
Contact
±8kV
±6kV
10 V/m
±2KV
±2KV
10 Vrms
Perf. Criteria A
Perf. Criteria A
Perf. Criteria A
Perf. Criteria A
Perf. Criteria A
Note: An external input filter capacitor is required if the module has to meet EN61000-4-4, EN61000-4-5. The filter capacitor we recommend is Nippon Chemi-con KY series, 220µF/100V, ESR 48mΩ
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Page 2 of 13
Rev A
TECHNICAL DATASHEET
JFCW24S3.3-20
MECHANICAL DRAWING
0.39 (9.9)
Unit: inches (mm)
0.22
(5.6)
DIA.
0.04(1.0)
1.00 (25.4)
3
6
2
0.200 (5.08)
0.10 (2.5)
0.100 (2.54)
0.400 (10.16) 0.400 (10.16)
0.50 (12.7)
1.00 (25.4)
0.800 (20.32)
5
1
4
BOTTOM
VIEW
PIN CONNECTIONS
PIN
ASSIGNMENT
1
+INPUT
2
-INPUT
3
CTRL
4
+OUTPUT
5
TRIM
6
-OUTPUT
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
EXTERNAL OUTPUT TRIMMING
Option
Suffix
Positive Remote ON/OFF (standard)
No Suffix
Negative Remote ON/OFF
R
Without ON/OFF Pin
D
Without ON/OFF & Trim Pin
G
Positive Remote ON/OFF without Trim Pin
F
Negative Remote ON/OFF without Trim Pin
RF
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Heatsink
HS
Heatsink with Clamp
HC
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Output can be externally trimmed
by using the method shown below.
TRIM UP
TRIM DOWN
5
6
RD
RU
5
4
Page 3 of 13
Rev A
TECHNICAL DATASHEET
JFCW24S3.3-20
DESIGN CONSIDERATIONS
Output Over Current Protection
When excessive output currents occur in the system, circuit protection is required on all power supplies. Normally,
over load current is maintained at approximately 150% of rated current for the JFCW20 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 condition
is removed.
One of the problems resulting from over current is that excessive heat may be generated in the 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 a 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 control IC to limit the output voltage.
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 placed as close as possible to the input terminals of the power
module for lower impedance.
Short Circuit Protection
Continuous, hiccup and auto-recovery mode.
During a short circuit the converter will shut down. The average current during this condition will be very low and
the device can be handled safely in this condition.
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 shown in 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.
Measurements shown in inches (mm)
0.5 (12.7)
Figure 1
TEMPERATURE MEASURING POINT
0.5 (12.7)
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TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
Heatsink Consideration
Equip heatsink for lower temperature and higher reliability of the module. Considering space and airflow is the
way to choose which heatsink is needed.
There are two types of heatsinks to choose from
Figure 2: Heatsink with Clamp (Suffix “HC”)
Figure 3: Heatsink (Suffix “HS”)
1.0±0.02 (25.4±0.5)
0.65 (16.5) ref.
1.0±0.02 (25.4±0.5)
0.65 (16.5) ref.
1.0±0.02 (25.4±0.5)
1.0±0.02 (25.4±0.5)
1.19 (30.1) ref.
All dimensions are 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 +OUTPUT
or -OUTPUT pins. With an external resistor between the TRIM and –OUTPUT pin, the output voltage set point
increases. With an external resistor between the TRIM and +OUTPUT pin, the output voltage set point decreases.
Trim Up Equation
Trim Down Equation
5110  2.5


 Rup  Vo, up  2.5  0.8  2050




(Vo, down  2.5)  5110
 2050
Rdown 
Vo  (Vo, down)


-OUTPUT
RU
-INPUT
+INPUT
TRIM
Figure 4
RD
JFCW24S3.3-20
Trim
Trimup
Rup
Trimdown
Rdown
1%
3.333V
385.071 kΩ
3.267V
116.719 kΩ
2%
3.366V
191.511 kΩ
3.234V
54.779 kΩ
3%
3.399V
126.990 kΩ
3.201V
34.133 kΩ
4%
3.432V
94.730 kΩ
3.168V
23.810 kΩ
5%
3.465V
75.374 kΩ
3.135V
17.616 kΩ
6%
3.498V
62.470 kΩ
3.102V
13.486 kΩ
7%
3.531V
53.253 kΩ
3.069V
10.537 kΩ
8%
3.564V
46.340 kΩ
3.036V
8.325 kΩ
9%
3.597V
40.963 kΩ
3.003V
6.604 kΩ
10%
3.630V
36.662 kΩ
2.970V
5.228 kΩ
+OUTPUT
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Page 5 of 13
Rev A
TECHNICAL DATASHEET
JFCW24S3.3-20
Remote ON/OFF Control
The Remote CTRL pin allows the user to turn the DC/DC power module on and off from a remote switch device.
The CTRL input can be switched by a number of switching devices. Figure 5 gives several examples of acceptable
configurations. The remote CTRL switch is activated by the voltage difference between the CTRL 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 Circuits
Figure 5
Isolated-Closure Remote ON/OFF
Level Control Using TTL Output
Level Control Using Line Voltage
There are two remote control options available: Positive logic (standard) and Negative logic (optional)
a. The positive logic structure turned the DC/DC module ON when the CTRL pin is at high-level logic and
turned the DC/DC module OFF when the CTRL pin is at low-level logic.
Figure 6
When JFCW20 module is turned OFF at Low-level logic
When JFCW20 module is turned ON at High-level logic
b. The negative logic structure turned the DC/DC module ON when the CTRL pin is at low-level logic and
turned the DC/DC module OFF when the CTRL pin is at high-level logic.
Figure 7
When JFCW20 module is turned ON at Low-level logic
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When JFCW20 module is turned OFF at High-level logic
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Page 6 of 13
TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
Graph 1: Efficiency vs. Output Current
Graph 2: Efficiency vs. Input Voltage (Full Load)
Graph 3: Output Power vs. Ambient Temperature with Airflow
(Nominal Vin)
Graph 4: Output Power vs. Ambient Temperature with Heatsink
& Airflow (Nominal Vin)
Graph 5: Power Dissipation Vs. Output Current
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TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
Graph 6: Typical Output Ripple and Noise
(Nominal Vin and Full Load)
Graph 7: Transient Response to Dynamic Load Change from
100% to 75% to 100% of Full Load at Nominal Vin
Graph 8: Typical Input Start-Up and Output Rise Characteristic
(Nominal Vin and Full Load)
Graph 9: 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)
Graph 11: Conducted Emission of EN55022 Class B
(Nominal Vin and Full Load)
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Page 8 of 13
TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
TEST SETUP
The JFCW24S3.3-20 specifications are tested with the following configurations:
Input Reflected-Ripple Current Measurement Test Setup
CURRENT PROBE MEASURE POINT
+Vin
L
Figure 8
+
BATTERY
+
C2
C1
-Vin
Component
Value
Voltage
Reference
L
C1
C2
12μH
10μF
10μF
---100V
100V
---Aluminum Electrolytic Capacitor
Aluminum Electrolytic Capacitor
Peak-to-Peak Output Ripple & Noise Measurement Setup
Figure 9
Figure 10
Output Voltage and Efficiency Measurement Setup
Figure 11
 Vout  Iout 
Efficiency  
 100%
Vin

Iin


NOTE: All measurements are taken at the module terminals
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Page 9 of 13
TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
EMI Considerations
Suggested Schematic for EN55022 Class B Limits
Recommended Layout with Input Filter
C5
L1
+INPUT
C1
+Vin
C2
C3
+Vout
DC/DC
CONVERTER
-Vin
-INPUT
LOAD
-Vout
C4
Figure 12
Figure 13
To meet EN55022 CLASS B the following components are needed:
Component
C1
C2 & C3
C4 & C5
L1
JFCW24S3.3-20
Voltage
50V
---2KV
----
Value
4.7µF
---470pF
325μH
Reference
1812 MLCC
---1808 MLCC
Common Choke, P/N: PMT-050
COMMON CHOKE: PMT-050
Unit: inches (mm)
0.43 (11.0) ref.
L: 325mH±35%
0.43 (11.0) ref.
0.30±0.008 (7.5±0.2)
DCR: 35Ω, max.
Test Conditions: 100KHz / 100mV
Recommended Through Hole: Ø0.04 in (Ø0.8 mm)
Ø0.02±0.004 (Ø0.6±0.1)
N1
3
2
0.1
(2.5)
1
N2
0.35 (8.8) ref.
4
0.30±0.008 (7.62±0.2)
Figure 14
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Page 10 of 13
TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
Recommended Pad Layout
Figure 15
NOTES:
1. All dimensions in inches [mm]
2. Tolerance: X.XXX±0.010 [XX.XX±0.25]
Pad Size (Lead Free Recommended)
Pin Through Hole: Ø0.047 in (Ø1.20 mm)
Top View Pad: Ø0.079 in (Ø2.00 mm)
Bottom View Pad: Ø0.118 in (Ø3.00 mm)
Soldering Considerations
Lead Free Wave Solder Profile for JFCW20 Series
Figure 16
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
Packaging Information
10 PCS per Tube
All dimensions are in inches (mm)
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Page 11 of 13
TECHNICAL DATASHEET
Rev A
JFCW24S3.3-20
SAFETY & 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 4A for JFCW24Sxx-20 and 2A for JFCW48Sxx-20
modules. 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 for the JFCW20 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 1,766,000 hours.
MIL-HDBK 217F NOTICE2 FULL LOAD, Operating Temperature at 25°C. The resulting figure for MTBF is
553,000 hours.
ORDERING INFORMATION
Part Number Example:
JFCW
24
S
3.3
-
20
R
HS
Series
Designation
Nominal
Input Voltage
Single Output
Nominal
Output Voltage
Output Power
PRODUCT STANDARD TABLE
Option
Suffix
No Heatsink
No Suffix
Heatsink
HS
Heatsink with Clamp
HC
PRODUCT STANDARD TABLE
Option
Positive Remote ON/OFF (standard)
Negative Remote ON/OFF
Without ON/OFF Pin
Without ON/OFF & Trim Pin
Positive Remote ON/OFF without Trim Pin
Negative Remote ON/OFF without Trim Pin
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Suffix
No Suffix
R
D
G
F
RF
Page 12 of 13
Rev A
TECHNICAL DATASHEET
JFCW24S3.3-20
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:
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(603)778-2300
(888)587-9255
(603)778-9797
sales@wallindustries.com
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5 Watson Brook Rd.
Exeter, NH 03833
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Page 13 of 13