SCR1021 datasheet(68/156 Pages) SUMIDA

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INVERTER < Notes on FL inverter transformer use >

Notes on FL inverter transformer use

Since FL Inverters transformers uses ultra thin wire in a small form factor and given the conditions that the FL inverters will be

exposed to Hi Voltage and High Frequency conditions. It is important to adhere to all of guidelines and recommendations that are

given in the following statements.

1. Terminal Polarity Connectivity

Please ensure that the correct polarity is applied to the Hi-Voltage (Secondary) and Low Voltage (GND) terminals. If floating or reverse

polarity is applied to either Hi-Voltage or Low Voltage, the result will be degradation in the isolation and in the worst case it could cause a

short.

Every FL Inverter type has its own specification for maximum operating voltage. It's important that the output voltage doesn't exceed

the specification. Operating beyond the specified voltage will result in poor isolation, self-generation of heat will increase, thus breaking

the isolation. Please be aware when selecting a transformer on voltage output performance, that extreme environmental conditions will

affect the transformer output voltage.

An inverter transformer, switching transistor, and CCFL all generate some level of self-generation of heat. Please prevent the transformer from

going over the limits of operating temperature. We also recommend the use of placing heat sinks near any parts that dissipate high level of heat.

1) Capacitor for Primary resonance

Due to Hi-frequency and resonance current, we recommend using the metalized polypropylene for high frequency (P. P), and a P.P.S

film capacitor.

2) Secondary Ballast Capacitor

High Voltage rating for capacitor should be used; especially since the ballast capacitor will have a high voltage and current level. Also,

recommend using a capacitor with the characteristic that are specified with high Q, low temperature coefficient (ie: SL Classification)

or better.

1) We recommend punching a hole in the PCB between the Hi-Voltage termination. This will increase the distance between the Hi-

Voltage and GND (termination).This will improve ensure safety distance between the Hi-Voltage and GND.

2) Please avoid mounting transformer on the edge of PCB. Ensure that there is at least 2mm distance from Transformer to other

components. This will help to prevent any type of leak current. Also, the top of transformer has a very high voltage potential.

3) When using multi-layer PCB's, please avoid placing a ground plane directly behind the Hi-Voltage side of the transformer.

4) When running traces from the transformer to connectors or from connector to CCFL, please use the shortest distance between

these points. Keeping the traces shorter will reduce the stray capacitance (pF). The stray capacitance can contribute towards lower

output voltage.

5) When running traces from the transformer, please avoid laying out traces in an angle direction. If the traces are running in an angle

direction there is a possibility of causing leak current or corona electric discharge.

6) We recommend that resisting be used between the Hi-Voltage side.

7) Recommendations for Breaking Away FL Inverter boards from Panel

2. Output voltage (the maximum opening voltage)

3. Operating temperature

4. Use circuit parts

5. Printed circuit board

If using a Pulse to control the brightness, please be aware that a pulse signal can generate an audible noise. We recommend using

current or voltage signal for controlling the brightness.

Since the FL inverter transformer is operating in the Hi-Voltage and Hi- frequency, we recommend incorporating a fuse on the input side

or using a thermal fuse. Please consider this recommendation due to the fact that if there was ever a short circuit there could be a

potential of part igniting.

1) Please ensure to follow the specifications for terminal stress.

2) Please avoid bending the terminals.

3) When mounting onto printed circuit board, it's recommended to handle one piece at one time when taking out from the packaging.

4) Please avoid applying shock on top of the FL transformer and prevent any others part from coming into contact with the transformer.

5) After mounting part onto P.C.B. please avoid any parts from coming into contact with the transformer.

6) Please avoid using the product if a large level of shock is to be applied to the part. Please review our specifications for shock.

7) Please avoid cutting any part of the coil terminal.

8) Our packing boxes have indications as to which side of the box should face up. Please adhere to these markings on our packaging.

9) During transportation, each must withstand 20kg or less, and sufficient packing is recommended to protect the parts.

10) During transportation, please avoid placing packaging in a horizontal position.

We have taken many precautions to ensure the reliability of our FL transformers. However, depending on the usage of our FL

transformers, it is possible that a disconnection may occur. This is why we strongly recommend that our guidelines be followed. We also

recommend checking for DCR measurements on the Secondary Side. Other option would be to perform aging test. Measure the DCR

after a pre-determined period of time.

If any quality issue should occur, it should be noted that the root cause of the failure might not have been contributed from

disconnection. Discussion with the customer to identify the root cause of quality issues will be immediately entered into.

6. Brightness Circuit

7. Protection circuit

8. Recommendations for Manufacture when handling our parts.

- Because of the low profile structure of the transformer, these parts are more susceptible to stress. We recommend that a

slit or break away tabs for easier removal of the inverter unit from the panel.

- When breaking away the inverter units from the panel, if using a V cut or perforated method. It's important that caution is

used when breaking away the inverter units from the panel. Please ensure that the amount of stress is not exceeded over

the specifications.

/ FLインバータトランス使用上の注意事項

INVERTER

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