HK series of products are mainly used in applications of two-wire
Patent Protected
RoHS
signal and HART transmission, to solve a series of problems due to
the ground potential difference during the transmission application
of them caused by different ground loops, such as, the signal
transmission errors around 4~20mA, followed by the interruption of
PART NUMBER SYSTEM
HK3S03B
Package Style
Output Voltage
Input Voltage
Product Series
HART communication or damage to equipment port device. HK
series adopts the loop way to take power, and compensates
transmission errors caused by electric potential difference, so as to
ensure the accuracy of the communication transmission.
SELECTION GUIDE
Model Number
*HK3S03B
HK5S03B
HK5S05B
HK5S03BV
HK8S03B
HK8SX3B
HK8S05IB
* Designing
Input Voltage
(VDC)
Nominal
3.3
5
5
5
7.5
7.5
7.5
Output Voltage
(VDC)
3.3
3.3
5
3.3
3.3
3
5
Output Current
(mA)
3.0
3.2
2.0
3.0
3.5
5.0
3.5
Input Current
(mA)(Typ.)
@ Max.load
4-20
4-20
4-20
3.5-22
4-20
4-20
4-20
@ No load
1
1
1
1
1
1
1
Reflection
Ripple Current
(mA,Typ.)
15
15
15
15
15
15
15
Max. Capacitor
Load (µF)
10
10
10
10
10
10
10
INPUT SPECIFICATIONS
Item
Test Conditions
3.3VDC input
Input Surge Voltage (1sec.max.)
5VDC input
7.5VDC input
Input Filter
Min.
-0.7
-0.7
-0.7
Typ.
--
--
--
Max.
5
9
18
VDC
Unit
Capacitance Filter
OUTPUT SPECIFICATIONS
Item
Line Regulation
Test Conditions
For Vin change of
±1%
HK8S05IB
Others
3VDC output
Load Regulation
10% to 100% load
3.3VDC output
HK5S05B
HK8S05IB
Temperature Drift
100% load
Min.
--
--
--
--
--
--
--
HK series
Typ.
--
--
15
15
12
--
--
2013.10.09- A/3
Max.
±0.25
±1.2
--
--
--
±1.5
±0.03
Page 1 of 4
Unit
%
%/°C
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MORNSUN
COMMON SPECIFICATIONS
Item
Isolation Voltage
Isolation Resistance
Switching Frequency
MTBF
Case Material
HK5S03BV
Weight
Others
--
2.1
--
--
Test Conditions
Input-Output, tested for 1 minute and leakage
current less than 1 mA
Input-Output, test at 500VDC
100% load, Input voltage range
MIL-HDFK-217F@25℃
Min.
1000
1000
--
3500
Typ.
--
--
100
--
Max.
--
--
300
--
Unit
VDC
MΩ
KHz
K hours
Plastic (UL94-V0)
2.9
--
g
ENVIRONMENTAL SPECIFICATIONS
Item
Item
Storage Humidity
Operating Temperature
Storage Temperature
Temp. rise at full load
Lead Temperature
Ta=25°C
1.5mm from case for 10 seconds
Test Conditions
Non condensing
Min.
--
-40
-50
--
--
Typ.
--
--
--
25
--
Max.
95
85
125
--
300
°C
Unit
%
Free air convection
PRODUCT TYPICAL CURVE
Temperatur e Der ating Curve
Out put Po wer Percent(% )
12 0
10 0
80
60
Saf e Operating Area
40
20
0
-40
0
40
85 10 5 12 0
Amb ie nt Temp.(
℃
)
(Figure1)
DIMENSIONS, RECOMMENDED FOOTPRINT & PACKAGING
(Figure 2)
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
HK series
2013.10.09- A/3
Page 2 of 4
(Figure 3)
Note:
1. Figure 2 applies to HK5S03B、HK5S05B、HK8S03B、HK8SX3B、HK8S05IB、HK3S03B；
2.Figure 3 applies to HK5S03BV.
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.
Oscilloscope
Lin
Cin
Current
Probe
DC DC
Load
Lin(4.7µH)
Cin(220µF, ESR < 1.0Ω at 100 KHz)
DESIGN REFERENCE
Ground Loop Problem In Signal Transmission And Ground Electric Potential Difference
There are many reasons causing ground loop problem in instrument circuit.When the signal transmission and receiving devices connected to a
different location or of different power supplies, it will lead to ground loop, and it is common in long cable transmission. Most of the reason is that
the equipment of the metal shell had physical contact with the ground. Ground loop produces electric circuit, and form error sources.
Because the accuracy of the signal can not be measured through simple observation in the receiving end of the signal. the land circulation for
different ground potential will bring error that can't be detected to signal loop. There is also a signal error problem caused by ground loop in the
absence of two-wire signal isolation transmission. Signals like lightning signal and surge signal will load on the signal line along with long wire,
and damage modulation and detection devices on the port. In another case, two components of the different potential port may lead to the port
voltage exceeding, and damage the device port subsequently.
Signal transmission mode of non-isolated two-wire system
3.3V
vol tage
reguls tor
current loop
DAC
½
4-20
mA
24V
transducer
½
½
R
L
PLC
ADC
MCU
2.5V
HART modulator
two wir e instr ument
(Figure 4)
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MORNSUN
HK series
2013.10.09- A/3
Page 3 of 4
In the circuit of figure 4, Sensor signal is converted into digital signals through the ADC, then sent to the current loop DAC and HART
modulator through MCU, form 4~20 mA signal output. Current loop DAC takes electricity from the PLC bus of output 4~20 mA, output 3.3 V and
2.5 V through the built-in voltage regulator, supply a small amount of power for MCU and HART modulator.
In the transmission of figure 4, there are ground electric potential differences between two-wire system instrument and PLC on the far side ,
introducing the common mode interference. The disturbance causes the transmission error of 4~20 mA, and affects the normal communication
HART bus. If the common mode interference is too large (over the voltage range of the components in the common-mode), it may cause damage
in the internal instrument of two wire devices.
Signal transmission mode of isolated two-wire system
H K
3.3V
tran s du c er
Dig ita l
iso lat ion
D
4 -20mA
½
volt age
regulstor
current loop
DA C
24V
½
½
R
L
PLC
ADC
MCU
2.5V
H A R T m o d u l a to r
tw o w ire in stru m e nt
(Figure 5)
Due to the potential risks based on the different ground, you can isolate the MCU and the current loop DAC and HART modulator by digital
isolation. Current loop DAC and HART modulator is floating form. They make the high impedance formed to two ground potential between two-
wire instrument and PLC system, reduce the loop current between the ground wire, and electrical isolation between two devices, so as to eliminate
the hidden trouble of common mode interference.
The two-wire instrument goes without additional power supply port. The power supply takes power through the 4-20mA loop. After the isolation
mode,2.5V power of HART modulator is still formed from the built-in voltage regulator of loop DAC regulator, but the power supply for the 3.3V
MCU system is a difficult problem. A better solution is to connect with a voltage stabilizing diode in the 4-20mA circuit as shown in Figure 5. Then
you can use HK module of MORNSUN to isolated and output 3.3Vpower to the MCU power system. Using the HK module and digital isolation
circuit made by MORNSUN, you can realize the electrical isolation of two-wire instrument and PLC system .It avoids the measuring error of the
system and damaging equipment caused by ground potential, and it further enhances the reliability of the system.
Note:
1. Operation under minimum load will not damage the converter; However, they may not meet all specifications.
2. Max. Capacitive Load is tested at nominal input voltage and full load.
3. Unless otherwise noted, All specifications are measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load.
4. In this datasheet, all test methods are based on our corporate standards.
5. All characteristics are for listed models, and non-standard models may perform differently. Please contact our technical support for more detail.
6. Please contact our technical support for any specific requirement.
7. Specifications of this product are subject to changes without prior notice.
MORNSUN Science & Technology Co.,Ltd.
Address: No. 5, Kehui St. 1, Kehui development center, Science Ave., Guangzhou Science City, Luogang district, Guangzhou,P.R.China.
Tel: 86-20-38601850
Fax:86-20-38601272
E-mail: info@mornsun.cn
Http://www.mornsun-power.com
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