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COSEL产品
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EMC
1.
How long should it take for Hi-pot test of
LEB150F-0524?
Answer : Our test voltage/time is 1.1 times of
specs/2 seconds. This is allowed by Safety
Standard. We do Hi-pot test for all products. |
2.
What is the receiving inspection procedure of
isolation test for DPF1000?
Answer : The test result is changed by earth
capacitor. (= Y capacitor)
If Y capacitor is bigger than our test circuit,
this model may not pass.
Because leakage current is increased.
And line pattern and FG pattern should be
separated. (distance: 4mm or more)
Please check capacitance of Y capacitor and PCB
layout. |
3.
Can CDS4004828 meet EMC class B with external
circuit?
Answer : Please check the attached pdf file. |
4.
The isolation voltage of PBA150F-15-N between
input and output mentioned in catalog is
AC3000V. If we need AC4000V isolation, are there
any other suggestions?
Answer : Isolation voltage of PBA50F-15-N is
shown 3,000V on our catalogue.
However, when we tested isolation by 1 sample,
the power supply was able to endure 5,000V
approximately.
If the guaranteed isolation voltage of 4,000V is
needed, we have to evaluate some subject.
For example, if internal component does not meet
to this voltage, we will not be able to
guarantee it.
Another method we suggested is to add the input
isolation transformer. |
5.
For SUCS102405B/ZUW252412/PBA50F-9, how long is
the isolation voltage DC500V being test?
Answer : 1 minute |
6.
Are there any inrush current level 4 standard of
LEB100F-0524?
Answer : I think it is surge voltage not inrush
current.
Since inrush current level is not decided by IEC
directive.
If it is surge voltage, the power supply meets
the level 4 of IEC61000-4-5(surge immunity). |
7.
Can PBA30 series pass the 4KV isolation test
between Input and Output?
Answer : We tested one sample for 4KV between
input and output and it passed the test. |
Input Voltage
1.
What is the minimum input voltage of
CBS1004812,CBS1004805 and CBS2004824-XCMNA that
it can work properly ?
Answer : The minimum input voltage COSEL
guaranteed is DC36V. However, these units have
capability to start-up at 31V approximately, and
if input voltage reached 33V, the rated output
voltage will be generated. However, in the input
voltage range between 33V and 36V, the input
current is increased due to low input voltage.
Therefore, the load should be derated. |
2.
The input voltage range of DBS400B modified
version is 250VDC-400VDC. If the input voltage
is less than 250VDC, is the power module in
input undervoltage lockout or not working?
Answer : DBS series are using lockout
circuit.The start-up voltage of DBS400B28-XTHIA
is more than DC180V.
By the way, the start-up input voltage and rated
input voltage range is different things.
If DBS400B28-XTHIA and DBS400B12-XMLM are used
under DC250Vin, we can not guarantee the
specification. |
3.
Can PBA1000 series work properly with input
voltage AC280V?
Answer : We are not able to guarantee AC280V
input.
Because the voltage exceeds the maximum rated
voltage of components.
PBA1000F could operate at AC280V. However, we
don't recommend this. |
4.
Can LCA30S-12 work at 100% load with input
voltage range 85V-90Vac?
Answer : If the input voltage is AC80V, the load
must be decreased to about 94% max. If input
voltage range is AC85~90V, it can be worked
normally at 100% load. |
5.
What is the input surge withstand (input voltage
and time) ability of CDS6002428?
Answer : 50V, <100ms |
6.
Can PBA300F-24/PBA300F-48 operate with input
voltage range from DC70 to DC166? Because we
don't want to use power module.
Answer : U option of PBA300 series can operate
at low input voltage by derating of output
power.
However this model needs the input voltage of
more than DC90V for start-up.
And this models can operate at DC70V after being
start-up. |
7.
Requirement: DBS series Po=550W; Vo=24V or 28V;
Vi=DC200-400V
Can you recommend the suitable power module?
Please provide the model no.
Answer : The power module of 550W output must be
used in Vi=DC250-400V.
Because when input voltage is DC200V, input
current will be too big.
So if customer uses the power module in
Vi=250-400V, we will be able to recommend the
below models.
28V output: DBS400B28-XLPG 28V,19.7A rated
24V output: DBS400B24-XNHMB 24V, 23A rated |
8.
Does CBS2002415 has input overvoltage protection
?
Answer : No, CBS series doesn't have overvoltage
protection for input. |
9. If
CBS2002415 haven't input overvoltage protection
function, how to prevent input overvoltage ?
Answer : Rated input voltage range is maximum
value for this module.Please use a constant
voltage power supply to input power. |
10.
If input voltage is abnormal such as DC60V or
DC80V, will CBS2002415 burn or explode ?
Answer : Smoke and fire will not be caused.
External fuse will be blown by breaking internal
circuit. |
11.
Please provide the external circuit diagram of
CBS1002415 with below requirements. Input
overvoltage protection function: the power
module will be shut down when input voltage from
DC37V to DC60V. When the input voltage becomes
normal,it can restart to work automatically.
Moreover, the power module must endure input
voltage DC500V at 10ms.
Answer : Please check the attached pdf file. |
Noise
1.
Can the ripple voltage of PBA1000F-36 be reduced
to less than 50mVp-p?
Answer : Yes. |
2. Is
it possible to reduce the ripple voltage of
ZUS152405 to less than 20mVp-p by testing with
20 MHz oscilloscope?
Answer :
 |
3.
Why CBS2004848-R has sound noise when the load
current is zero?
Answer : Because the transformer insides makes
noise when the load current is zero or very
small due to magnetostrictive resonance. |
4. Is
it possible for using the external circuit
diagram to make the output ripple noise of
DBS400B15 less than 10mVp-p?
Answer : We recommend to add a common mode coil
between output terminals and E2 (electrical
capacitor). The value is 1~2mH approximately.
If the coil is added to DBS's output, the output
noise may be reduced to 10mV or less.
Please evaluate under the end-user's condition
before using. |
5.
The option G is the capacitor between input and
output is removed. Could you explain the
function of option G? And why is SUS1R5 series
without the option G?
Answer : SU1R5 doesn't have option G which is
without the capacitor between input to output.
But SU3, 6 and 10 have its capacitor.
The followings are the advantages and
disadvantages of option G:
Advantages: reducing through noise from input to
output
Disadvantages : Ripple noise of option G is
bigger than normal type. |
6. In
order to reduce the ripple voltage, we added a
inductor (L) on the output side. But the
recommended external circuit doesn't have
inductor at output terminal? What is the
advantages and disadvantages of using inductor
at output terminal?
Answer : External inductor is used to reduce the
output noise than no inductor.However, the
inductor is bigger and more expensive than a
capacitor.Therefore, we recommend the capacitor
only without inductor at first.If the noise is
not reduced the capacitor only, external
inductor must be added. |
7.
Can PBA30F-5 PBA30F-9 PBA30F-12 meet the ripple
noise level below 80mVp-p?
Answer : Those power supply the ripple noise can
be smaller than 80mVp-p under testing condition
25 degree and using 20MHz oscilloscope. Please
check the attached pdf file. |
8. We
are using 2 pcs CBS504805 in parallel redundancy
operation. Why is the ripple noise so big? It is
around 400mVp-p.
Answer : After we checked your circuit pattern,
we found some mistakes about your mounting
method. Please change the circuit pattern ,
don't put the input and output pattern
underneath the power modules. Please check
instruction manual 6.1 Mounting method. |
OutPut Voltage
1. Is
it possible for CDS4004802 to adjust the output
voltage from 2VDC to 1VDC?
Answer : When using the CDS4004802 in the range
of 1-1.2V, there is a possibility that the
overshoot occur. And then the overshoot is about
140mV. |
2.
For SUCW1R5 and SUCW3 dual outputs converter, if
the two loading isn't same, ie. one is bigger,
another one is smaller. What will happen on the
output voltage and current?
Answer : Output voltage will be changed by load
factor because SUCW series is dual output type.
In case of dual output, one voltage decreases by
large current, and another output voltage
increases.
We call this characteristic "cross regulation".
The changed value has not decided, however it
may be +/- 5% approximately. |
Temperature
1. Is
it possible for PBA1000 series stored at -40
degree?
Answer : Internal component's storage
temperature is guaranteed
The internal fan's storage temperature is -30
degree C lowest.
So we can guarantee the storage temperature at
-30 degree C only |
2. Is
it possible for the storage temperature of CBS
series under -50 degree?
Answer : It is possible to start-up at -50
degree C. But the specification of ripple and
ripple noise is changed between -50 degree C to
-40 degree C and they are approximately 1.5
times the specification at -40 degree C. |
3.
What is the detailed distribution curve of OTP
point for CDS6002428?
Answer : Overheat protection of CDS600 works at
115 degree baseplate temperature |
4.
Can DPF1000 and DBS400B24 be auto-recovery from
OTP?And what is the OTP point of DPF1000 and
DBS400B24?
Answer : No, these models don't have
auto-recovery function from OTP and it shuts
down only.
OTP operating temp: DBS series --- 100 +/-10
degree DPF1000 --- 95 degree approximately |
5. Is
it possible for SU series stored at -55 degree
C?
Answer : SU series can be stored at -55 degree
C. |
6.
What is the thermal resistance and maximum case
temperature of ZUW104812?
Answer : Please check the attached pdf file. |
|
7.
Can PBA300F-48 operate at -40 degree ?
Answer : Unfortunately, our company does not
have AC-DC converter to meet at -40 degree.
Because the internal FAN is not guaranteed
operation at -40 degree.
However, we confirmed PBA300F-48 can operate at
-50 degree by testiing 1 sample. Please find the
attached pdf file. |
|
8 .
Can LDA10F-12-SN work under -25 degree and how
big is the ripple voltage?
Answer : After the evaluation is finished, we
can not guarantee LDA10F-12 working at -25C.
When the power supply starts up, we found
the output voltage was higher than the rated
voltage. |
9 .
Can LDA30F-15-SN work under -25 degree and how
big is the ripple voltage?
Answer : Regarding to LDA30F-15, The output
voltage was unstable at -25C when AC85V input.
So, we guarantee LDA30F-15 at below condition.
Temperature: -25C Input voltage: AC170~264V
Please take a look at the attached file about
ripple noise. |
|
10.
Can DBS150A15 start up at -50 degree?
Answer : Yes. Please check the attached file. |
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