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Frequently Asked Questions

Daitron Power Supply FAQ

Q1. How to make negative (-) voltage using HFS series?

A1.
Normally you can get positive (+) voltage by connecting between + and -.
Connect + to FG when you need negative (-) voltage.

Q2. What is the difference between Soft Switching and Hard Switching.

A2.
Switching Power Supply has mainly 2 types of switching topologies.
1.Hard Switching
When PSU turn on/off operates to create power, it will also create
ringing effects(noise) at the edge of square waves of the current.
2.Soft Switching (Resonant)
In our system, we followed Soft Switching in order to reduce noise.
Soft Switching could minimize the noise because of its current output forms sine wave.

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Q3. What is the recommended Voltage and Current value for remote control feature?

A3.
5V / 5mA

But please refer to the instruction manual (2-6 remote on/off circuit) when you want to use
6.5V or more to control turning on/off this feature.

Q4. Ripple Voltage Value in our data sheet is Rms, Peak or Peak to Peak?

A4.
Basically Daitron Power Supply products use Vp-p (peak to peak) value in our data sheet.
All these values are under the JEITA specified measurement method as below.

1) Peak
2) Peak to Peak
3) RMS
4) Cycle


We carefully choose these values (most of these values are from worst case conditions).
Actual value would be smaller depends on ambient temperature, voltage and load conditions.
Please refer to our test data.

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Q5. Can you get the test data of DPS products?

A5.
Yes. You may download at our technical data page. Please click the below link;
http://www.daitronpower.com/technical-data.html
If you have any other specific request, please submit us your requirement in detail.
Email: techsupport@daitronpower.com

Q6. My PSU suddenly stopped and doesn't work. What's happened?

A6.
Sometimes OVP or OCP feature works and stop PSU to operate for safety reason.
You may turn off AC and disconnect wires. Then wait for a couple of minutes.
Then please connect wires again. It will work again.
Otherwise, please consult our local field sales team for further assistance.

Q7. What is the switching frequency of DPS?

A7.
Some models are fixed, but others are not.
The switching frequency of our PSUs are mostly less than 127KHz.
Following 3 models have fixed switching frequencies as below.

HFS150A:58KHz
DFS150A:58KHz
DFS100A:70KHz

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Q8. Part number definition

A8.
Please take a look at the "Part number definition" as below link.
http://www.daitronpower.com/pdf/Daitron_Power_Supply_product_number_definition.pdf

Q9. Input Voltage Range

A9.
Some of our models are only accept narrow input range, but most of the type can accept
"Universal Input" (86-264Vac). That is why we mention this in our data sheets.

Q10. Parallel Connection

A10.
Some customers request Parallel connection in order to get more output power.
But our system can not connect in Parallel .

Q11. What are the differences with other switching power supplies?

A11.
a.
Ultra Low Ripple and Noise
HFS series
3mV to 10mV (depends on models)
Others
100mV or more
b.
Low Leakage Current
HFS series
40uA to 100uA (depends on models)
Other Medical
100uA, 250uA and 300uA
Others
350 to 750uA
c.
Small size and weight
* Low noise feature could minimized external filter components count.

Q12. What are the advantages compared with linear type of power supplies?

A12.
a.
Small size
b.
Low Cost
c.
High Efficiency (= Low Heat)
d.
Universal wide input range (85VAC to 264VAC)

Q13. What is the country of origin of these products?

A13.
Japan

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