EJR48S5-2000 [WALL]
Analog Circuit,;
| 型号： | EJR48S5-2000 |
| 厂家： | 
WALL INDUSTRIES,INC. |
| 描述： | Analog Circuit, |
| 文件： | 总12页 (文件大小：425K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL DATASHEET
Rev A
EJR48S5-2000
10W DC/DC Converter
36-75 VDC Input
5 VDC Single Output at 2A
Features:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
RoHS Compliant
No Minimum Load Requirement
10 Watts Output Power
Trim Function: ±10%
High Efficiency up to 81%
Basic Isolation
Input to Output Isolation: 1500VDC min
2:1 Wide Input Voltage Range
Remote ON/OFF Control
CNT Function
Options:
Industry Standard Footprint: 2” x 1” x 0.40”
Industry Standard Pin-out
Low Output Noise
•
•
•
RoHS Compliance
Short Pins or Long Pins
Positive or Negative Logic or No Logic
for CNT Function
Output Over Current Protection
Description:
The EJR48S5-2000 is a new open frame DC/DC converter for optimum efficiency and power
density. This model provides 2A of output current in an industry standard 2 x 1 x 0.4 inch package.
The small size makes this series an ideal choice for small spaces, high current, and low voltage
applications. This series provides CNT and trim functions, high efficiency, and positive or negative
logic remote on/off.
(888) 597-WALL
www.wallindustries.com
Page 1 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Technical Specifications
Model No.
EJR48S5-2000
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)
Related condition
Min
Nom
Max
Unit
Operating Voltage Range
Input Current
36
48
75
0.4
80
Vdc
A
Vin = 36V to 75Vdc, Io = Io, max
Continuous
0
0
Input Voltage
Vdc
mApk-pk
Vdc
Transient (100ms)
100
Nominal Vin, full load, Ta = 25°C
Input Reflected Ripple Current (20MHz BW)
Under-Voltage Lock Out
12µH differential-mode inductance; 220µF/100V aluminum
5
20
capacitor
Turn on at
Turn off at
NO
NO
OUTPUT (Vo)
4.95
-1%
5.05
+1%
Output Voltage Setpoint
Vin = Vin,min to Vin, max, full load; Ta = 25°C
5.0
Vdc
Load Regulation
Line Regulation
Output Voltage Adjustment Range
Minimum Load
Minimum load to maximum load
LL to HL at Full Load
(See page 8)
25
10
mV
mV
%Vo
A
90
0
110
70
0
Measured with a 1µF /10V X7R ceramic capacitor and a
10µF/30V tantalum capacitor
Output Ripple & Noise (5Hz to 20MHz BW)
40
mVpk-pk
Rated Output Current
Output Voltage Overshoot
Turn-On Time
Start Delay Time
Output Power
External Load Capacitance
Output Current-Limit Inception
PROTECTION
Over Voltage Protection
Over Current Protection
Short Circuit Protection
2
150
5
12
10
A
mV
ms
ms
W
µF
A
Io, max, Ta = 25°C
Io, max
I0, max, Ta = 25°C
0
1
5
2200
2.2
Latch
3.2
clamp
(See page 9)
NO
3.2
Vdc
A
2.2
Continuous, automatic recovery
DYNAMIC LOAD RESPONSE (∆Io/∆t = 1A/10µs, nominal Vin, Ta = 25°C (measured with a 1µF /100V ceramic capacitor and a 10µF/35V tantalum capacitor)
Load Step (25% to 50%)
Io, max.
40
50
mV
µs
mV
µs
Deviation Settling Time (25% to 50%)
Load Step (10% to 100%)
To nominal Vout
Io, max.
150
140
450
200
180
500
Deviation Settling Time (10% to 100%)
To nominal Vout
REMOTE ON/OFF (add the suffix “R” to the part number for Negative Remote ON/OFF or “-1” to the part number for no Remote ON/OFF pin) (See page 7)
High Level = ON
Low Level = OFF
Low Level = ON
3.5
-0.7
-0.7
3.5
10
0.8
0.8
10
2.0
-
Positive Logic (Standard)
Negative Logic (Option)
Positive Logic
Vdc
Vdc
mA
mA
Enable Pin Voltage
Enable Pin Current
High Level = OFF
Logic Low
Logic High (leakage current)
Logic Low
Logic High (leakage current)
-
-
-
-
4.0
-
Negative Logic
GENERAL
Switching Frequency
Efficiency
320
81
kHz
%
Vdc
pF
Nominal Vin, and full load; Ta=25°C
1mA for 1min, slew rate of 1500V/10sec
80
1500
Isolation Voltage (Input-Output)
Isolation Capacitance
ENVIRONMENTAL
Operating Ambient Temperature
Operating Case Temperature
Storage Temperature
Operating Humidity
Temperature Coefficient
MTBF
1000
-40
-40
-55
5
55
100
125
95
oC
oC
oC
RH%
% / °C
hours
0.02
Io = Io,max, Tc=25°C (See page 11)
2,000,000
MECHANICAL
Weight (encapsulated)
23.3 grams
2.0 x 1.0 x 0.4 inches
Dimensions (L x W x H)
(See page 3)
50.80 x 25.40 x 10.16 mm
(888) 597-WALL
www.wallindustries.com
Page 2 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Figure 1: Mechanical Dimensions
Unit: inches [mm]
Tolerance: X.Xmm = ±0.5mm
X.XXmm = ±0.25mm
Pin Length: 5.8mm
PIN CONNECTIONS WITHOUT REMOTE ON/OFF PIN
PIN CONNECTIONS
PIN #
SINGLE OUTPUT
DUAL OUTPUT
+Vin
PIN #
SINGLE OUTPUT
DUAL OUTPUT
1
2
3
4
5
6
+Vin
-Vin
1
2
3
4
5
6
+Vin
+Vin
-Vin
No Pin
+Vo
Common
-Vo
-Vin
Remote ON/OFF
+Vo
-Vin
Remote ON/OFF
+Vo
No Pin
+Vo
No Pin (Trim-optional)
-Vo
No Pin (Trim-optional)
-Vo
COM
-Vo
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Page 3 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
EJR48S5-2000 Graphs. All test conditions are at 25°C
Graph 1: Typical Efficiency
Graph 2: Typical Output Over Current Curve
Graph 3: Typical Output Ripple and Noise
Graph 4: Typical Transient Response to Step Increase in Load from
50% to 75% of Full Load at Nominal Vin (∆Io/∆t = 1A/10µs)
(Nominal Vin and Full Load)
(888) 597-WALL
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Page 4 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
EJR48S5-2000 Graphs (Continued). All test conditions are at 25°C
Graph 5: Typical Transient Response to Step Increase in Load from
Graph 6: Typical Input Start-Up from Power On
10% to 100% of Full Load at Nominal Vin (∆Io/∆t = 1A/10µs)
(Nominal Vin and Full Load)
Graph 7: Typical Input Start-Up from CNT On
(Positive Logic)
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Page 5 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
DESIGN CONSIDERATIONS:
Converter Derating
At 48VDC input, 55°C ambient temperature, the EJR48S5-2000 is rated for full power. For operation above ambient temperature of 55°C
output power must be derated as shown in Figure 2. The case temperature should be used to determine maximum temperature limits as
shown in Figure 3.
Figure 2
Figure 3
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Page 6 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Typical Application
Figure 4 Typical Application
EJR48S5-2000
Cin: Recommended input capacitor - 47µF/100V high frequency low ESR electrolytic type capacitor.
Cout: Recommended output capacitor - 220µF/35V capacitor.
Cout1: Recommended 1µF/25V ceramic capacitor.
If Ta<-5°C use a 220µF tantalum capacitor parallel with a 220µF/10V high frequency low ESR electrolytic capacitor.
Note:
1) The output capacitor should be kept 50mm~70mm away from the pins of the module.
2) The EJR48S5-2000 module cannot be used in parallel mode directly.
Remote ON/OFF Control
Three Remote ON/OFF control logic options are available. The CNT logic, CNT Voltage, and the module working state are shown in the
following table.
Low Voltage High Voltage
OPEN
OFF
ON
Suffix
R
Negative Logic
Positive Logic
No Logic
ON
OFF
x
OFF
ON
x
Blank
-1
x
Low Voltage: -0.7V ≤ L ≤ 0.8V
High Voltage: 3.5V ≤ H ≤ 10V
ON= means that the module is on
OFF = means that the module is off
OPEN = means the control pin is left open
Note: Normally, VCNT ≤ 12V
The following figure shows a few simple CNT circuits
Figure 5
Relay CNT
Simple CNT
Isolated CNT
Transistor CNT
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Page 7 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Output Voltage Trim
The +Vo output voltage of the EJR48S5-2000 can be trimmed by using the trim pin provided. Applying a resistor to the trim pin through
a voltage divider from the output will cause the +Vo output to increase by up to 10% or decrease by up to 10%. Trimming up by more
than 10% of the nominal output voltage may affect the performance of the converter or damage it. Trimming down more than 10% can
cause the converter to regulate improperly. If the trim pin is not needed, it should be left open.
Rup = The resistor required to achieve the desired trimmed up output voltage
Rdown = The resistor required to achieve the desired trimmed down output voltage
V
V
o, up = The desired trimmed up output voltage
o, down = The desired trimmed output voltage
Trim Up
With an external resistor connected between the Trim and –Output pins the output voltage set point increases (see Figure 6)
Figure 6: Trim Up Circuit
The following equation determines the required external-resistor value to obtain a percentage output voltage change of %
Take the inner resistor R1 of the converter is 2.7K for example
19.66 − (2.7 ∗ Vo, up
)
Rup
=
KΩ
Vo, up − 5
Note: The formula above just shows the rough calculation of Rup
Trim Down
With an external resistor connected between the Trim and +Output pins the output voltage set point decreases (see Figure 7)
Figure 7: Trim Down Circuit
The following equation determines the required external-resistor value to obtain a percentage output voltage change of
19.66 − (5.16∗Vo, down
)
Rdown
=
KΩ
Vo, down − 5
Note: At elevated output voltages the maximum power rating of the module remains the same and the output current capability will decrease correspondingly.
(888) 597-WALL
www.wallindustries.com
Page 8 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Output Over Current Protection
The EJR48S5-2000 features fold-back voltage limiting as part of its OCP circuit. When the output current exceeds 110% to 150% of the
rated output current the output voltage will fall from its normal output to within 90% of nominal Vout.
Input Reverse Voltage Protection
Under installation and cabling conditions where reverse polarity across the input may occur, reverse polarity protection is recommended.
Protection can easily be provided as shown in Figure 8. In both cases the diode used is rated for 2A/100V. Placing the diode across the
inputs rather than in-line with the input offers an advantage in that the diode only conducts in a reverse polarity condition, which increases
circuit efficiency and thermal performance.
Figure 8: Reverse Polarity Protection Circuit
Output Capacitance
High output current transient rate of change (high di/dt) loads might require high values of output capacitance to supply the instantaneous
energy requirement to the load. To minimize the output voltage transient drop during this transient, low ESR (Equivalent Series
Resistance) capacitors might be required since a high ESR will produce a correspondingly higher voltage drop during the current transient.
When the load is sensitive to ripple and noise, an output filter can be added to minimize the effects. A simple output filter to reduce output
ripple and noise can be made by connecting a capacitor C1 across the output as shown in Figure 9. The recommended value for the output
capacitor C1 is 220µF.
Figure 9 Output Ripple Filter
Extra care should be taken when long leads or traces are used to provide power to the load. Long lead lengths increase the chance for
noise to appear on the lines. Under these conditions C1 can be added across the load, with a 1µF ceramic capacitor C2 in parallel generally
as shown in Figure 10.
Figure 10 Output Ripple Filter for a Distant Load
Decoupling
Noise on the power distribution system is not always created by the converter. High-speed analog or digital loads with dynamic power
demands can cause noise to cross the power inductor back onto the input lines. Noise can be reduced by decoupling the load. In most
cases, connecting a 10µF tantalum or ceramic capacitor in parallel with a 1µF ceramic capacitor across the load will decouple it. The
capacitors should be connected as close to the load as possible.
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Page 9 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Ground Loops
Ground loops occur when different circuits are given multiple paths to common or earth ground as shown in Fig 11. Multiple ground
points can have slightly different potentials and cause current flow through the circuit from one point to another. This can result in
additional noise in all the circuits. To eliminate this problem, circuits should be designed with a single ground connection shown in Fig 12.
Figure 11
Figure 12
Ground Loops
Single Ground Point
Fusing
The EJR48S5-2000 power module has no internal fuse. An external fuse must always be used. To meet international safety requirements,
a 250V rated fuse should be used. If one of the input lines is connected to chassis ground, then the fuse must be placed on the other input
line. Standard safety agency regulations require input fusing. Recommended rating is 1A for the EJR48S5-2000.
EMC
For conditions where EMI is a concern, a different input filter can be used. Figure 10 shows a filter designed to reduce EMI effects.
EJR48S5-2000 can meet EN55022 Class A with Figure 13.
Figure 13 Recommended Layout with Input Filter
Recommended values
Component
C4
Value/Rating
47µF/100V
220µF/16V
1.8mH
Type
Aluminum Electrolytic
Aluminum
C11
L3
C1
C6, C7
C8, C9
C2, C3
C12, C13
C5
Common mode
0.68µF
Metal-film capacitor
Safety Y capacitor
Safety Y capacitor
Metal-film capacitor
3300pF/2KV
1000pF/2KV
1000pF
0.01µF
0.68µF/100V
Ceramic capacitor
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Page 10 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Safety
For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the
spacing and separation requirements of the end-use safety agency standard, i.e., CSA 22.2 NO 60950 and UL 60950. The EJR48S5-2000
input-to-output isolation is basic insulation. The DC/DC power module should be installed in end-use equipment, in compliance with the
requirements of the ultimate application, and is intended to be supplied by an isolated secondary circuit. When the supply to the DC/DC
power module meets all the requirements for SELV (<60VDC), the output is considered to remain within SELV limits (level 3). If
connected to a 60VDC power system, double or reinforced insulation must be provided in the power supply that isolates the input from
any hazardous voltages, including the AC mains. One input pin and one output pin are to be grounded or both the input and output pins
are to be kept floating. Single fault testing in the power supply must be performed in combination with the DC/DC power module to
demonstrate that the output meets the requirement for SELV. The input pins of the module are not operator accessible.
Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV
voltage to appear between the output pin and ground.
MTBF
The MTBF, calculated in accordance with Bellcore TR-NWT-000332 (25°C) is 2,000,000 hours. Obtaining this MTBF in practice is
entirely possible. If the board temperature is expected to exceed +25°C then we also advise that it be oriented for the best possible
cooling in the air stream.
Soldering
The EJR48S5-2000 converter is compatible with standard wave soldering techniques. When wave soldering, the converter pins should be
preheated for 20~30 seconds at 100°V and wave soldered at 260°C for less than 10 seconds.
When hand soldering, the iron temperature should be maintained at 425°C and applied to the converter pins for less than 5 seconds.
Longer exposure can cause internal damage to the converter. Cleaning can be performed with cleaning solvent IPA or with water.
Installation
Although, the EJR48S5-2000 can be mounted by any orientation, free air-flow must be given.
(888) 597-WALL
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Page 11 of 12
TECHNICAL DATASHEET
Rev. A
EJR48S5-2000
Ordering Information:
Part Number Example:
EJR 48 S 5 - 2000 R
Series
Designation
Nominal
Input Voltage
Single Output
Nominal
Output Voltage
Output Current
Suffix
Option
Positive Remote ON/OFF
No Suffix
0.228”±0.02” pin length (standard)
Negative Remote ON/OFF logic
0.228”±0.02” pin length
R
-1
Without ON/OFF pin
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, 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:
ꢀ(603)778-2300
ꢀ(888)587-9255
ꢀ(603)778-9797
E-mail:
Web:
sales@wallindustries.com
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
Address:
(888) 597-WALL
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Page 12 of 12
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